Publication list for Talos for Materials Science

Title: A single wire as all-inclusive fully functional supercapacitor
Authors: Qi Kang, Jin Zhao, Xue Li, Guoyin Zhu, Xiaomiao Feng, Yanwen Ma, Wei Huang, Jie Liud
References: Nano Energy 32 (2017) 201-208
Date: December 2016
Abstract
Title: A single wire as all-inclusive fully functional supercapacitor
Authors: Qi Kang, Jin Zhao, Xue Li, Guoyin Zhu, Xiaomiao Feng, Yanwen Ma, Wei Huang, Jie Liud
References: Nano Energy 32 (2017) 201-208
Date: December 2016
Abstract: A key challenge in wire-shaped energy storage devices is their complete encapsulation for practical applications.Hence it is of great importance to design and fabricate an all-inclusive structure in which inner and outercurrent collectors, active materials, electrolyte and separator are all enclosed in a single wire structure.However, due to the surface area differences between the shell and core electrodes, the matching of thecapacitance on both electrodes become a challenging task. We solved this problem by using multiple thin Niwires with three-dimensional MnO2-carbon nanotubes (CNTs)-graphene hybrids as the core electrode and a Nitube as the shell electrode in a coaxial-cable supercapacitors structure. Within the seamless tubular electrode,all the necessary components are included and protected by the metal tube shell. The fully encapsulated singlewire devices show a high area-normalized capacitance of 31 mF cm−2 at a current density of 0.29 mA cm−2,comparable to the best cable devices with more exposed structures. Such devices are more suitable forapplications by providing more mechanical stability and avoiding exposure and loss of electrolytes duringoperation.
Title: Effect of carbon reactant on microstructures and mechanical properties of TiAl/Ti2AlC composites
Authors: Xiaojie Song, Hongzhi Cui, Ye Han, Nan Hou, Na Wei, Lei Ding, Qiang Song
References: Materials Science & Engineering A 684 (2017) 406-412
Date: December 2016
Abstract
Title: Effect of carbon reactant on microstructures and mechanical properties of TiAl/Ti2AlC composites
Authors: Xiaojie Song, Hongzhi Cui, Ye Han, Nan Hou, Na Wei, Lei Ding, Qiang Song
References: Materials Science & Engineering A 684 (2017) 406-412
Date: December 2016
Abstract: iAl/Ti2AlC composites were successfully synthesized by vacuum arc melting with TiC, graphite powder, and carbon nanotubes (CNTs) as carbon sources. As the amount of Ti2AlC ceramic increased, the microhardness and compressive strength of the TiAl/Ti2AlC composites improved linearly. Importantly, the TiAl/Ti2AlC prepared with TiC as the carbon source exhibited higher microhardness and compressive strength than that composites prepared with graphite powder or CNTs. During vacuum arc melting, three reactions occur successively: Ti+Al→TiAl, Ti+C→TiC, and TiAl+TiC→Ti2AlC. Ti2AlC was formed by peritectic reaction between the TiAl melt and TiC particles. A large amount of TiC was left in the TiAl matrix, which acted to improve the hardness and strength of the composites. The fracture behavior of the composite was mainly transgranular fracture. The pinning, pulling out, and the effect of crack deflecting of TiC particles, together with the interlayer tearing, plastic shearing, folding, and crimping of Ti2AlC played a key role in the improvement of the strength and plasticity of the composites.
Title: Influence of sol-gel derived ZrB2 additions on microstructure and mechanical properties of SiBCN composites
Authors: Yang Miao, Zhihua Yanga,  Jiancun Rao, Xiaoming Duan, Peigang He, Dechang Jia, YiBing Cheng, Yu Zhou
References: Ceramics International 43 (2017) 4372-4378
Date: December 2016
Abstract
Title: Influence of sol-gel derived ZrB2 additions on microstructure and mechanical properties of SiBCN composites
Authors: Yang Miao, Zhihua Yanga,  Jiancun Rao, Xiaoming Duan, Peigang He, Dechang Jia, YiBing Cheng, Yu Zhou
References: Ceramics International 43 (2017) 4372-4378
Date: December 2016
Abstract: A simple method for introducing ZrB2 using sol-gel processing into a SiBCN matrix is presented in this paper. Zirconium n-propoxide (ZNP), boric acid and furfuryl alcohol (C5H6O2) (FA) were added as the precursors of zirconia, boron oxide and carbon forming ZrB2 dispersed in a SiBCN matrix. SiBCN/ZrB2 composites with different contents of ZrB2 (5, 10, 15, and 20 wt%) were formed at 2000 °C for 5 min by spark plasma sintering (SPS). The microstructures were carefully studied. TEM analysis showed that the as formed ZrB2 grains were typically 100–500 nm in size and had uniform distribution. HRTEM revealed clean grain boundaries between ZrB2 and SiC, however, a separation of C near the SiC boundary was observed. The flexural strength, fracture toughness, Young's modulus and Vicker's hardness of composites all improved with the ZrB2 contents and SiBCN matrix containing 20 wt% of ZrB2 could reach 351±18 MPa, 4.5±0.2 MPa·m1/2, 172±8 GPa and 7.2±0.2 GPa, respectively. The improvement in fracture toughness can be attributed to the tortuous crack paths due to the presence of reinforcing particles.
Title: Stability of YeTieO nanoparticles during laser melting of advanced oxide dispersion-strengthened steel powder
Authors: Hye Jung Chang, Hye Young Cho, Jeoung Han Kim
References: Journal of Alloys and Compounds 653 (2015) 528-533
Date: September 2016
Abstract
Title: Stability of YeTieO nanoparticles during laser melting of advanced oxide dispersion-strengthened steel powder
Authors: Hye Jung Chang, Hye Young Cho, Jeoung Han Kim
References: Journal of Alloys and Compounds 653 (2015) 528-533
Date: September 2016
Abstract: The microstructural stability of YeTieO nanoparticles during spot laser beam melting of oxidedispersion-strengthened steel powder is investigated. After the spot laser beam melting, Y2Ti2O7 oxidenanoparticles are successfully retained without dissolution or transformation. However, their particlesize is considerably coarser than typical Y2Ti2O7 nanoparticles due to the active agglomeration of the YeTieO nanoparticles, Cr-carbides, and Ar bubbles. In particular, an unexpectedly large volume of Arbubbles embedded or attached to the Y2Ti2O7 nanoparticles is observed. The Ar gas bubbles seem toaccelerate the particle agglomeration. No other phase is observed than Y2Ti2O7 oxide, Cr-carbide and Arbubble in the sample.
Title: Nanoscale origins of the oriented precipitation of Ti3Al in Ti\\Al systems
Authors: Hao Wu, Guohua Fan, Lin Geng, Xiping Cui, Meng Huang
References: Scripta Materialia 125 (2016) 34-38
Date: August 2016
Abstract
Title: Nanoscale origins of the oriented precipitation of Ti3Al in Ti\\Al systems
Authors: Hao Wu, Guohua Fan, Lin Geng, Xiping Cui, Meng Huang
References: Scripta Materialia 125 (2016) 34-38
Date: August 2016
Abstract: Oriented precipitation of Ti3Al in Ti\\Al alloys has been already proposed, however the underlying physicalmechanism behind the specific precipitation behavior is still unclear. Here, we report that the origin is preferredformation of stacking faults on prismatic planes. In other words, stacking faults induced by Al alloying act as nu-cleation sources for the precipitation of Ti3Al phases, and their particularly spatial distributions assist in“orienting” Ti3Al precipitates (oriented precipitation). These findings enrich current understanding of nanoscaleprecipitation behavior, and provide the inspiration ofcontrolling theprecipitation behaviorbytailoringthephys-ical type and spatial distribution of defects.
Title: Ternary FeNiS2 ultrathin nanosheets as an electrocatalyst for both oxygen evolution and reduction reactions
Authors: Jun Jiang, Shu Lu, Han Gao, Xing Zhang, Han-Qing Yu
References: Nano Energy 27 (2016) 526-534
Date: July 2016
Abstract
Title: Ternary FeNiS2 ultrathin nanosheets as an electrocatalyst for both oxygen evolution and reduction reactions
Authors: Jun Jiang, Shu Lu, Han Gao, Xing Zhang, Han-Qing Yu
References: Nano Energy 27 (2016) 526-534
Date: July 2016
Abstract: High-performance and cost-effective electrocatalysts are essential for both oxygen evolution reaction(OER) and oxygen reduction reaction (ORR). Herein, we provide the first report about a facile colloidalmethod to fabricate 2D ultrathin ternary FeNiS2 nanosheets (NSs). When serving as an OER catalystunder alkaline conditions, they exhibited superior electrocatalytic performance over RuO2 and achieved acurrent density of 10 mA cmÀ2 with a potential of 1.54 V and a Tafel slope of 46 mV decadeÀ1. Mean-while, an ORR catalytic activity was also achieved with an onset potential of 0.78 V, a Tafel slope of107 mV decadeÀ1, and a high selectivity with electron transfer number of 3.92 and H2O2% of 3.6% at 0.3 Vunder neutral conditions, which were comparable to those of the commercial Pt/C. The ternary FeNiS2-NSs were superior over the binary FeS NSs and Ni9S8 nanorods synthesized via the same routes. Moreimportantly, with the resistance for the corrosion and poison from the alkaline and phosphate buffersolution, the FeNiS2 NSs exhibited superior stability without apparent OER or ORR catalytic activity lossover long-term operation. Their enhanced electrocatalytic performance compared to their binarycounterparts indicate that a new strategy to prepare high performance OER and ORR catalysts was de-veloped. In addition, the as-prepared FeNiS2 NSs could serve as a noble-metal-free catalyst for OER orORR with good electrocatalytic activities and long-term stability for practical applications.
Title: Effect of La addition on the particle characteristics, mechanical and electrical properties of in situ Cu-TiB2 composites
Authors: Cunlei Zou, Huijun Kang, Wei Wang, Zongning Chen, Rengeng Li, Xiaoxia Gao, Tingju Li, Tongmin Wang
References: Journal of Alloys and Compounds 687 (2016) 312-319
Date: June 2016
Abstract
Title: Effect of La addition on the particle characteristics, mechanical and electrical properties of in situ Cu-TiB2 composites
Authors: Cunlei Zou, Huijun Kang, Wei Wang, Zongning Chen, Rengeng Li, Xiaoxia Gao, Tingju Li, Tongmin Wang
References: Journal of Alloys and Compounds 687 (2016) 312-319
Date: June 2016
Abstract: In situ Cu-TiB2 composites can be synthesized via metallurgical process by mixing Cu-B and Cu-Ti masteralloys before casting. In this paper, La, as a rare earth element was added to the composites to improvethe comprehensive properties and the effects of its addition on the microstructures, mechanical andelectrical characteristics of Cu-TiB2 composites were investigated. Results show that addition of Lasignificantly diminishes the average size and facilitates a homogeneous distribution of TiB2 particles inthe copper matrix. As a result, an improvement in mechanical properties was achieved. In particular, aremarkable change in the conductivity of the composites appears with the variation of La content. Themechanisms of particle refinement and improvements in properties by La alloying were analyzed.
Title: Gas-assisted electron-beam-induced nanopatterning of high-quality titanium oxide
Authors: A V Riazanova, B N Costanzi, A I Aristov, Y G M Rikers, J J L Mulders, A V Kabashin,E Dan Dahlberg and L M Belova 
References: Nanotechnology ,Volume 27, Number 11
Date: February 2016
Abstract
Title: Gas-assisted electron-beam-induced nanopatterning of high-quality titanium oxide
Authors: A V Riazanova, B N Costanzi, A I Aristov, Y G M Rikers, J J L Mulders, A V Kabashin,E Dan Dahlberg and L M Belova 
References: Nanotechnology ,Volume 27, Number 11
Date: February 2016
Abstract: Electron-beam-induced deposition of titanium oxide nanopatterns is described. The precursor is titanium tetra-isopropoxide, delivered to the deposition point through a needle and mixed with oxygen at the same point via a flow through a separate needle. The depositions are free of residual carbon and have an EDX determined stoichiometry of TiO2.2. High resolution transmission electron microscopy and Raman spectroscopy studies reveal an amorphous structure of the fabricated titanium oxide. Ellipsometric characterization of the deposited material reveals a refractive index of 2.2−2.4 RIU in the spectral range of 500−1700 nm and a very low extinction coefficient (lower than 10−6 in the range of 400−1700 nm), which is consistent with high quality titanium oxide. The electrical resistivity of the titanium oxide patterned with this new process is in the range of 10-40 GΩ cm and the measured breakdown field is in the range of 10-70 V  μ m−1. The fabricated nanopatterns are important for a variety of applications, including field-effect transistors, memory devices, MEMS, waveguide structures, bio- and chemical sensors.
Title: Probing effective photocorrosion inhibition and highly improved photocatalytic hydrogen production on monodisperse PANI@CdS core-shell nanospheres
Authors: Chao Wanga, Li Wang, Jun Jin, Jing Liu, Yu Li, Min Wu, Lihua Chen, Binjie Wang, Xiaoyu Yang, Bao-Lian Su
References: Applied Satalysis B: Environmental 188 (2016) 351-359
Date: February 2016
Abstract
Title: Probing effective photocorrosion inhibition and highly improved photocatalytic hydrogen production on monodisperse PANI@CdS core-shell nanospheres
Authors: Chao Wanga, Li Wang, Jun Jin, Jing Liu, Yu Li, Min Wu, Lihua Chen, Binjie Wang, Xiaoyu Yang, Bao-Lian Su
References: Applied Satalysis B: Environmental 188 (2016) 351-359
Date: February 2016
Abstract: CdS is a very good visible-light responsive photocatalyst for hydrogen production. However, the fast recombination of photogenerated electron-hole pairs and quick photocorrosion limit its application in photocatalysis. To address these problems, we herein have designed and synthesized monodis-perse polyaniline@cadmium sulfide (PANI@CdS) core-shell nanospheres to probe the mechanisms of photocorrosion inhibition and photocatalytic H2 production. All the PANI@CdS core-shell nanospheres demonstrate highly enhanced photocorrosion inhibition and photocatalytic hydrogen production com-paring to the pure CdS nanospheres. Particularly, the PANI@CdS core-shell nanospheres with the thinnest PANI shell possess the highest hydrogen production rate of 310 ␮mol h−1 g−1 in 30 h without deactivation. Our results reveal that the newly formed C S and/or N Cd bonds in PANI@CdS prevent the reduction of the surface sulfide ions to sulphur, leading to effective photocorrosion inhibition. Our results also verify that the photogenerated holes migrating from valence band (VB) of CdS to the highest occupied molecular orbital (HOMO) of PANI leads to the enhanced photocatalytic hydrogen production. This work can shed some light on the mechanism of conducting polymers modifying metal sulfides for effective photocorrosion inhibition and highly enhanced photocatalytic activities.
Title: Stability of Y-Ti-O nanoparticles during laser melting of advanced oxide dispersion-strengthened steel powder
Authors: Hye Jung Chang, Hye Young Cho, Jeoung Han Kim
References: Journal of Alloys and Compounds, Volume 653, December 25, 2015, Pages 528-533
Date: December 2015
Abstract
Title: Stability of Y-Ti-O nanoparticles during laser melting of advanced oxide dispersion-strengthened steel powder
Authors: Hye Jung Chang, Hye Young Cho, Jeoung Han Kim
References: Journal of Alloys and Compounds, Volume 653, December 25, 2015, Pages 528-533
Date: December 2015
Abstract: The microstructural stability of Y-Ti-O nanoparticles during spot laser beam melting of oxide dispersion- strengthened steel powder is investigated. After the spot laser beam melting, Y2Ti2O7 oxide nanoparticles are successfully retained without dissolution or transformation. However, their particle size is considerably coarser than typical Y2Ti2O7 nanoparticles due to the active agglomeration of the Y-Ti-O nanoparticles, Cr-carbides, and Ar bubbles. In particular, an unexpectedly large volume of Ar bubbles embedded or attached to the Y2Ti2O7 nanoparticles is observed. The Ar gas bubbles seem to accelerate the particle agglomeration. No other phase is observed than Y2Ti2O7 oxide, Cr-carbide and Ar bubble in the sample.
Title: Catalysis: The complexity of intimacy
Authors: Roger Gläser
References: Nature 528, 197-198. December, 10 2015
Date: December 2015
Abstract
Title: Catalysis: The complexity of intimacy
Authors: Roger Gläser
References: Nature 528, 197-198. December, 10 2015
Date: December 2015
Abstract: Catalysts that contain two types of active site split long hydrocarbon molecules into more-useful shorter ones Research into controlling the nanoscale separation of the sites challenges accepted design rules for such catalysts.
Title: Synergistic promotion of solar-driven H2 generation by three-dimensionally ordered macroporous structured TiO2-Au-CdS ternary photocatalyst
Authors: Heng Zhao, Min Wu, Jing Liu, Zhao Deng, Yu Li, Bao-Lian Su
References: Applied Catalysis B: Environmental 184 (2016) 182-190
Date: November 2015
Abstract
Title: Synergistic promotion of solar-driven H2 generation by three-dimensionally ordered macroporous structured TiO2-Au-CdS ternary photocatalyst
Authors: Heng Zhao, Min Wu, Jing Liu, Zhao Deng, Yu Li, Bao-Lian Su
References: Applied Catalysis B: Environmental 184 (2016) 182-190
Date: November 2015
Abstract: A ternary photocatalyst TiO2-Au-CdS based on three-dimensionally ordered macroporous TiO2 (3DOM TiO2) was successfully prepared to enhance the light absorption, extend the light responsive region, reduce the recombination rate of charge carriers and promote the efficiency of water splitting H2 evolution ultimately. The obtained 3DOM TiO2-Au-CdS powder has a pure anatase phase of TiO2 and greenockite structured CdS according to the XRD results and TEM analysis. Au nanoparticles (AuNPs) and CdS were evenly distributed in the 3DOM structure which enhances H2-generation rate under visible light by improving light harvesting and utilizing its mass transfer facilitation. As a result, the hydrogen gen-eration rate (1.81 mmol h−1 g−1) using 3DOM TiO2-Au-CdS photocatalyst under visible light irradiation was 13-fold higher than the binary 3DOM TiO2-CdS reference photocatalyst. Under ultraviolet-visible light, the photogenerated electrons in TiO2 would be transferred to recombine with the holes of CdS and under visible light, electrons would move to the conduction band (CB) of TiO2 from CdS via AuNPs. The two different types of internal electron-transfer process in the ternary photocatalyst under ultraviolet and visible light were proposed respectively and both would efficiently reduce the recombination rate of photogenerated electrons and holes thus stimulate H2 evolution rate. The present work demonstrated an excellent example of the synergistic effect of the light absorption enhancement by 3DOM structure, the photosensitizing and electron reservoir effect of AuNPs and the reduction of recombination rate of charge carriers by CdS to highly promote the photocatalytic activity in water splitting reaction.
Title: Three-dimensional characterization of Gd nanoparticles using STEM-in-SEM tomography in a dual-beam FIB- SEM
Authors: Brandon Van Leer; Cedric Bouchet-Marquis; Huikai Cheng
References: SPIE 9636, Scanning Microscopies 2015, 963606. October 21, 2015
Date: October 2015
Abstract
Title: Three-dimensional characterization of Gd nanoparticles using STEM-in-SEM tomography in a dual-beam FIB- SEM
Authors: Brandon Van Leer; Cedric Bouchet-Marquis; Huikai Cheng
References: SPIE 9636, Scanning Microscopies 2015, 963606. October 21, 2015
Date: October 2015
Abstract: A thin section sample of gadolinium nanoparticles ranging in size up to 50 nm mounted on an aluminum substrate was prepared using in-situ lift-out (INLO) by FIB. The sample was thinned using 30 kV Ga+ FIB to approximately 125 nm. Using an in-situ stage with 360 degree continuous tilt, the thin section was imaged every 1 degree with 30 keV SEM and the STEM detector through approximately 125 degrees of tilt. The data set was then reconstructed into a 3D rendering using FEI's tomography reconstruction software, Inspect3D Express, and visualized using FEI's Avizo image and data analysis software. The technique and results compared with conventional TEM and STEM tomography using a 200 keV FEI Talos TEM will be discussed.
Title: Enhanced oxidation-resistant Cu-Ni core-shell nanowires: controllable one-pot synthesis and solution processing to transparent flexible heaters
Authors: Chen J, Chen J, Li Y, Zhou W, Feng X, Huang Q, Zheng JG, Liu R, Ma Y, Huang W.
References: Nanoscale. 7(40):16874-9. October 8, 2015.
Date: October 2015
Abstract
Title: Enhanced oxidation-resistant Cu-Ni core-shell nanowires: controllable one-pot synthesis and solution processing to transparent flexible heaters
Authors: Chen J, Chen J, Li Y, Zhou W, Feng X, Huang Q, Zheng JG, Liu R, Ma Y, Huang W.
References: Nanoscale. 7(40):16874-9. October 8, 2015.
Date: October 2015
Abstract: Coating nickel onto copper nanowires (Cu NWs) by one-pot synthesis is an efficient approach to improving the oxidation resistance of the nanowires. Because Ni is much less conductive than Cu, it is of great importance to understand the relationship between the thickness of the Ni coating layer and the properties of NWs. Here we demonstrate one-pot synthesis of Cu-Ni core-shell NWs with a tunable Ni thickness by simply varying the Cu and Ni mole ratio in the precursor.
Title: Direct carbon coating at high temperature on LiNi0.5Mn1.5O4 cathode: Unexpected influence on crystal structure and electrochemical performances
Authors: Wang, Hailong; Shi, Zhongqi; Li, Jiawen; Yang, Shuo; Ren, Ruibo; Cui, Jianyou; Xiao, Jiali; Zhang, Bo
References: Journal of Power Sources, Volume 288, p. 206-213. August 15, 2015
Date: August 2015
Abstract
Title: Direct carbon coating at high temperature on LiNi0.5Mn1.5O4 cathode: Unexpected influence on crystal structure and electrochemical performances
Authors: Wang, Hailong; Shi, Zhongqi; Li, Jiawen; Yang, Shuo; Ren, Ruibo; Cui, Jianyou; Xiao, Jiali; Zhang, Bo
References: Journal of Power Sources, Volume 288, p. 206-213. August 15, 2015
Date: August 2015
Abstract: Carbon coated LiNi0.5Mn1.5O4/C composite has been directly synthesized at 800 °C without using reducing gas or introducing additional low temperature treatments. Scanning/transmission electron microscope (S/TEM) observation shows clear coating layer on the particle's surface, which has been verified by Energy Dispersive X-Ray Spectroscopy (EDX), Raman spectra and Brunauer-Emmett-Teller (BET); and the results indicate the coating layer is amorphous carbon which significantly increases the BET surface area, and the carbon content is around 0.6 wt%.
Title: Design of Base Zeolite Catalysts by Alkali-Metal Grafting in Alcoholic Media
Authors: Tobias C. Keller, Kartikeya Desai, Sharon Mitchell, and Javier Pérez-Ramírez
References: ACS Catal., 2015, 5 (9), pp 5388-5396. August 4, 2015
Date: August 2015
Abstract
Title: Design of Base Zeolite Catalysts by Alkali-Metal Grafting in Alcoholic Media
Authors: Tobias C. Keller, Kartikeya Desai, Sharon Mitchell, and Javier Pérez-Ramírez
References: ACS Catal., 2015, 5 (9), pp 5388-5396. August 4, 2015
Date: August 2015
Abstract: This study investigates the synthesis of base catalysts through the postsynthetic grafting of alkali cations (Li, Na, K, Rb, or Cs) onto USY zeolites in alcoholic solutions of the corresponding metal hydroxides. In contrast to previous studies conducted in aqueous media, the utilization of alcohols (MeOH, EtOH, or iPrOH) offers increased control over the metalation process while simultaneously averting degradation and dissolution of the crystalline framework. The achievement of close to an atomic dispersion of the alkali metals in the zeolite is confirmed by in-depth characterization combining 23Na MAS NMR, microscopy, elemental mapping, and CO2 chemisorption.
Title: Light emission from silicon with tin-containing nanocrystals
Authors: Søren Roesgaard, Jacques Chevallier, Peter I. Gaiduk, John Lundsgaard Hansen, Pia Bomholt Jensen, Arne Nylandsted Larsen, Axel Svane, Peter Balling and Brian Julsgaard
References: AIP Advances 5, 077114, July 8, 2015
Date: July 2015
Abstract
Title: Light emission from silicon with tin-containing nanocrystals
Authors: Søren Roesgaard, Jacques Chevallier, Peter I. Gaiduk, John Lundsgaard Hansen, Pia Bomholt Jensen, Arne Nylandsted Larsen, Axel Svane, Peter Balling and Brian Julsgaard
References: AIP Advances 5, 077114, July 8, 2015
Date: July 2015
Abstract: Tin-containing nanocrystals, embedded in silicon, have been fabricated by growing an epitaxial layer of Si_{1-x-y} Sn_{x}C_{y}, where x = 1.6 % and y = 0.04 %, followed by annealing at various temperatures ranging from 650 to 900 degrees C. The nanocrystal density and average diameters are determined by scanning transmission-electron microscopy to ~ 10^{17} cm^{-3} and ~ 5 nm, respectively. Photoluminescence spectroscopy demonstrates that the light emission is very pronounced for samples annealed at 725 degrees C, and Rutherford back-scattering spectrometry shows that the nanocrystals are predominantly in the diamond-structured phase at this particular annealing temperature. The origin of the light emission is discussed.
Title: Graphene oxide nanoparticle attachment and its toxicity on living lung epithelial cells
Authors: Linnea Ahlinder; Jiří Henych; Susanne Wiklund Lindström; Barbro Ekstrand-Hammarström; Václav Stenglc and Lars Österlund
References: RSC Adv., 2015,5, 59447-59457. July 1, 2015
Date: July 2015
Abstract
Title: Graphene oxide nanoparticle attachment and its toxicity on living lung epithelial cells
Authors: Linnea Ahlinder; Jiří Henych; Susanne Wiklund Lindström; Barbro Ekstrand-Hammarström; Václav Stenglc and Lars Österlund
References: RSC Adv., 2015,5, 59447-59457. July 1, 2015
Date: July 2015
Abstract: Since its discovery, graphene and its oxidized form, graphene oxide (GO), have attracted interest in a wide range of technical applications. Concerns about their potential toxicity calls for scrutinized studies, but hitherto conflicting results have been reported which partly may be due to variations of synthesis and exposure procedures. Here we report on the attachment and toxicity of contamination-free graphene oxide nanoparticles (GONP) in living lung epithelial cells.
Title: A Facile Multi-interface Transformation Approach to Monodisperse Multiple-Shelled Periodic Mesoporous Organosilica Hollow Spheres
Authors: Teng Z, Su X, Zheng Y, Zhang J, Liu Y, Wang S, Wu J, Chen G, Wang J, Zhao D, Lu G
References: J Am Chem Soc. June, 24 2015; 137(24):7935-44
Date: June 2015
Abstract
Title: A Facile Multi-interface Transformation Approach to Monodisperse Multiple-Shelled Periodic Mesoporous Organosilica Hollow Spheres
Authors: Teng Z, Su X, Zheng Y, Zhang J, Liu Y, Wang S, Wu J, Chen G, Wang J, Zhao D, Lu G
References: J Am Chem Soc. June, 24 2015; 137(24):7935-44
Date: June 2015
Abstract: The synthesis of well-defined and complex hollow structures via a simple method is still a major challenge. In this work, a facile and controllable "multi-interface transformation" approach for preparation of monodisperse multi- shelled periodic mesoporous organosilica (PMO) hollow spheres has been established by a one-step hydrothermal treatment of successively grown organosilica particles. In addition, various organic groups (alkyl, aromatic, nd heteroelement fragments) are successfully incorporated into the multi-shelled PMO hollow spheres by successively adding different bridged organosilica precursors.
Title: Liquid phase epitaxy of binary III–V nanocrystals in thin Si layers triggered by ion implantation and flash lamp annealing
Authors: Rene Wutzler, Lars Rebohle, Slawomir Prucnal, Felipe L. Bregolin, Rene Hübner, Matthias Voelskow, Manfred Helm and Wolfgang Skorupa
References: J. Appl. Phys. 117, 175307. May 6, 2015
Date: May 2015
Abstract
Title: Liquid phase epitaxy of binary III–V nanocrystals in thin Si layers triggered by ion implantation and flash lamp annealing
Authors: Rene Wutzler, Lars Rebohle, Slawomir Prucnal, Felipe L. Bregolin, Rene Hübner, Matthias Voelskow, Manfred Helm and Wolfgang Skorupa
References: J. Appl. Phys. 117, 175307. May 6, 2015
Date: May 2015
Abstract: The integration of III-V compound semiconductors in Si is a crucial step towards faster and smaller devices in future technologies. In this work, we investigate the formation process of III-V compound semiconductor nanocrystals, namely, GaAs, GaSb, and InP, by ion implantation and sub-second flash lamp annealing in a SiO2/Si/SiO2 layer stack on Si grown by plasma-enhanced chemical vapor deposition. Raman spectroscopy, Rutherford Backscattering spectrometry, and transmission electron microscopy were performed to identify the structural and optical properties of these structures.
Title: Stabilization of iron by manganese promoters in uniform bimetallic FeMn Fischer–Tropsch model catalysts prepared from colloidal nanoparticles
Authors: M. Dad; H.O.A. Fredriksson; J. Van de Loosdrecht; P.C. Thüne; J.W. Niemantsverdriet
References: Catalysis, Structure & Reactivity, Volume 1, Issue 2 (April 2015), pp. 101-109
Date: April 2015
Abstract
Title: Stabilization of iron by manganese promoters in uniform bimetallic FeMn Fischer–Tropsch model catalysts prepared from colloidal nanoparticles
Authors: M. Dad; H.O.A. Fredriksson; J. Van de Loosdrecht; P.C. Thüne; J.W. Niemantsverdriet
References: Catalysis, Structure & Reactivity, Volume 1, Issue 2 (April 2015), pp. 101-109
Date: April 2015
Abstract: A systematic study was carried out to investigate the response of monodisperse supported Fe and FeMn nanoparticles to treatments in O2, H2 and H2/CO at temperatures between 270 and 400°C. Uniform size (7-14 nm), Fe and mixed FeMn nanoparticles were synthesised by applying thermal decomposition of Fe- and Mn-oleate complexes in a high boiling point solvent. By combining X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) analysis, the phase composition and morphology of the model catalysts were studied.
Title: Thermal stability and structural evolution of quaternary Ti–Ta–B–N coatings
Authors: M. Mikulaa, T. Rocha, D. Plašienkaa, L. Satrapinskyya, P. Švec sr.c, D. Vlčkováa, M. Dvoranováa, B. Grančiča, M. Gregora, A. Plecenika, P. Kúša
References: Surface and Coatings Technology, Volume 259, Part C, November 25, 2014, Pages 698-706
Date: November 2014
Abstract
Title: Thermal stability and structural evolution of quaternary Ti–Ta–B–N coatings
Authors: M. Mikulaa, T. Rocha, D. Plašienkaa, L. Satrapinskyya, P. Švec sr.c, D. Vlčkováa, M. Dvoranováa, B. Grančiča, M. Gregora, A. Plecenika, P. Kúša
References: Surface and Coatings Technology, Volume 259, Part C, November 25, 2014, Pages 698-706
Date: November 2014
Abstract: Nanostructured hard coatings are becoming fundamental in many application areas due to their highly enhanced mechanical properties compared to conventional materials. Among others, novel quaternary systems are attracting increasing attention since they are expected to further improve endurance of such coatings. In this work, combined experimental and ab initio analysis of thermal stability and structural evolution of quaternary Ti-Ta-B-N coatings with Ta content 0-40 at.% prepared by reactive magnetron co-sputtering is presented. All prepared Ti1-x-yTaxByN coatings in the as-deposited state exhibit amorphous structure, which is supported by ab initio calculations.