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Nanotechnology

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https://www.readbyqxmd.com/read/29165320/effect-of-high-carbon-incorporation-in-co-substrates-on-the-epitaxy-of-hexagonal-boron-nitride-graphene-heterostructures
#1
Alireza Khanaki, Hao Tian, Zhongguang Xu, Renjing Zheng, Yanwei He, Zhenjun Cui, Jingchuan Yang, Jianlin Liu
We carried out a systematic study of hexagonal boron nitride/graphene (h-BN/G) heterostructure growth by introducing high incorporation of carbon (C) source on a heated cobalt (Co) foil substrate followed by boron and nitrogen sources in a molecular beam epitaxy system. With the increase of C incorporation in Co, three distinct regions of h-BN/G heterostructures were observed from region (1) where the C saturation is not attained at the growth temperature (900 °C) and G is grown only by precipitation during cooling process to form a "G network" underneath the h-BN film; to region (2) where the Co substrate is just saturated by C atoms at the growth temperature and a part of G growth occurs isothermally to form G islands and another part by precipitation, resulting in a non-uniform h-BN/G film; and to region (3) where a continuous layered G structure is formed at the growth temperature and precipitated C atoms add additional G layers to the system, leading to a uniform h-BN/G film...
November 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160774/etchant-free-transfer-of-2d-nanostructures
#2
Fu Zhang, Chad Erb, Lauren Runkle, Xiaotian Zhang, Nasim Alem
The effective use of the van der Waals 2D materials relies on their successful transfer from the growth substrate onto other target substrates in the form of large films or flakes. In particular, it is important to transfer such atomically thin samples to various substrates with minimal sample damage and exposure to etchants and chemicals to realize their applications. Here we develop a universal transfer method that not only is free of reactive etchants, but also can maintain the film morphology intact with no tears and cracks...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160771/synthesis-of-oxide-free-aluminum-nanoparticles-for-application-to-conductive-film
#3
Yung Jong Lee, Changsoo Lee, Hyuck Mo Lee
Aluminum nanoparticles are considered promising as alternatives to conventional ink materials, replacing silver and copper nanoparticles due to their extremely low cost and low melting temperature. However, a serious obstacle to realizing their use as conductive ink materials is the oxidation of aluminum. In this research, we synthesized the oxide-free aluminum nanoparticles using catalytic decomposition and an oleic acid coating method, and these materials were applied to the conductive ink for the first time...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160243/formation-and-magnetic-properties-of-infep-ag-nanorods-fabricated-with-noble-metal-ag-using-an-ion-milling-method
#4
Jae Min Sohn, Hyungsang Kim, Hyunsik Im, Hyungbae Kim, Juwon Lee, Yoon Shon, N G Subramaniam, Taewon Kang, Deuk Young Kim, Hyun Cheol Koo, Joo-Hyeon Lee, Jing Dong Song, Chang-Soo Park, Eun Kyu Kim
The formation, including the density and height of the InFeP:Ag nanorods doped with noble metal Ag using an ion milling method, was preponderantly determined from transmission electron microscopy and x-ray diffraction analyses. We investigate, in particular, the enhanced ferromagnetism of the well-aligned InFeP:Ag nanorods. Auger electron spectroscopy and x-ray photoelectron spectroscopy measurements were carried out in order to investigate the incorporation of Ag and to verify the local chemical bonding of the InFeP:Ag nanorods...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160238/thermal-transport-in-epitaxial-si1-x-ge-x-alloy-nanowires-with-varying-composition-and-morphology
#5
A El Sachat, J S Reparaz, J Spiece, M I Alonso, A R Goñi, M Garriga, P O Vaccaro, M R Wagner, O V Kolosov, C M Sotomayor Torres, F Alzina
We report on structural, compositional, and thermal characterization of self-assembled in-plane epitaxial Si1-x Ge x alloy nanowires grown by molecular beam epitaxy on Si (001) substrates. The thermal properties were studied by means of scanning thermal microscopy (SThM), while the microstructural characteristics, the spatial distribution of the elemental composition of the alloy nanowires and the sample surface were investigated by transmission electron microscopy and energy dispersive x-ray microanalysis...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160237/chemical-vapor-deposition-growth-of-boron-carbon-nitrogen-layers-from-methylamine-borane-thermolysis-products
#6
Fabrice Leardini, Eduardo Flores, Andres R Galvis, Isabel Jimenez-Ferrer, Jose-Ramon Ares, Carlos Sanchez, Pablo Molina, Herko P van der Meulen, Cristina Gomez-Navarro, Guillermo Lopez-Polin, Fernando J Urbanos, Daniel Granados, F Javier Garcia-Garcia, Umit B Demirci, Pascal G Yot, Filippo Mastrangelo, Maria Grazia Betti, Carlo Mariani
This work investigates the growth of B-C-N layers by Chemical Vapor Deposition using methylamine borane (MeAB) as single-source precursor. MeAB has been synthesized and characterized, paying particular attention to the analysis of its thermolysis products, which are the gaseous precursors for B-C-N growth. Samples have been grown on Cu foils and transferred onto different substrates for their morphological, structural, chemical, electronic and optical characterizations. The results of these characterizations indicate a segregation of h-BN and Graphene-like (Gr) domains...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160231/hydrothermal-synthesis-of-stable-metallic-1t-phase-ws2-nanosheets-for-thermoelectric-application
#7
Mingxing Piao, Jin Chu, Xiao Wang, Yao Chi, Heng Zhang, Chaolong Li, Haofei Shi, Min-Kyu Joo
Two-dimensional (2D) materials have gained great attention as a promising thermoelectric (TE) material due to their unique density of state with confined electrons and holes. Here, we synthesized 1T phase tungsten disulfide (WS2) nanosheets with high TE performance via hydrothermal method. Flexible WS2 nanosheets restacked thin films were fabricated by employing vacuum filtration technique. The measured electrical conductivity was 45 S/cm with Seebeck coefficient of +30 μV/K at room temperature, indicating a p-type characteristic...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160229/improved-localized-surface-plasmon-resonance-index-sensitivity-based-on-chemically-synthesized-gold-nanoparticles-on-indium-tin-oxide-surfaces
#8
Jin Zhu, Xiaolong Li, Wei Zheng, Biao Wang, Yubo Tian
The results of this reported work indicated that gold nanoparticles (Au NPs) arrays self-assembled on Indium Tin Oxide (ITO) glasses can obtain broader localized surface plasmon resonance (LSPR) wavelength range and higher sensitivity than the bare quartz. The results of surface electric field calculated using Finite Difference Time Domain (FDTD) showed that the electric field of nanoparticles on ITO glasses is enhanced and the repulsive forces within each particle is weakened. According to the dipolar interaction mechanism, a weakened repulsive forces within each particle lead to a lower resonance frequency and a strong redshift of the LSPR spectra...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160228/controlled-synthesis-of-quantum-confined-cspbbr3-perovskite-nanocrystals-under-ambient-condition
#9
Huimei He, Bing Tang, Ying Ma
Room temperature recrystallization is a simple and convenient method for synthesis of all-inorganic perovskite nanomaterials with excellent luminescent properties. However, the fast crystallization usually brings the colloidal stability and uncontrollable synthesis issues in the formation of all-inorganic perovskite. In the present study, we present a new strategy to prepare the quantum confined CsPbBr3 nanocrystals with controlled morphology under ambient condition. With the assist of fatty acid-capped precursor, the crystallization and the following growth rate can be retarded...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160225/phosphatidylserine-targeted-single-walled-carbon-nanotubes-for-photothermal-ablation-of-bladder-cancer
#10
Needa A Virani, Carole Davis, Patrick McKernan, Paul Hauser, Robert E Hurst, Joel Slaton, Ricardo P Silvy, Daniel E Resasco, Roger G Harrison
Bladder cancer has a 60-70% recurrence rate most likely due to residual tumour left behind after a transurethral resection (TUR). Failure to completely resect the cancer can lead to recurrence and progression into higher grade tumours with metastatic potential. We present here a novel therapy to treat superficial tumours with the potential to decrease recurrence. The therapy is a heat-based approach in which bladder tumour specific single-walled carbon nanotubes (SWCNTs) are delivered intravesically at a very low dose (0...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160224/colloidal-paradigm-in-supercapattery-electrode-systems
#11
Kunfeng Chen, Dongfeng Xue
Among decades of development, electrochemical energy storage system is now sorely in need of new design paradigm at nanosize and ion-level to satisfy the higher energy and higher power demand. In this review paper, we introduce a new colloidal electrode paradigm for supercapattery which integrates multiple-scale matter existing forms, i.e., ion clusters, colloidal ions, nanosized materials, into one colloid system, coupled with multiple interactions, i.e., electrostatic, van der Waals force, chemical bonding, leading to the formation of many redox reactive centers...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155692/mass-transport-modeling-for-the-electroreduction-of-co-sub-2-sub-on-cu-nanowires
#12
David Raciti, Mark Mao, Chao Wang
Mass transport plays an important role in the CO<sub>2</sub> reduction electrocatalysis. Albeit being more pronounced on nanostructured electrodes, the studies of mass transport for CO<sub>2</sub> reduction have yet been limited to planar electrodes. We report here the development of a mass transport model for the electroreduction of CO<sub>2</sub> on Cu nanowire electrodes. Fed with the experimental data from electrocatalytic studies, the local concentrations of CO<sub>2</sub>, HCO<sub>3</sub><sup>-</sup>, CO<sub>3</sub><sup>2-</sup> and OH<sup>-</sup> on the nanostructured electrodes are calculated by solving the diffusion equations with spatially distributed electrochemical reaction terms incorporated...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155417/growth-of-rutile-tio2-nanorods-in-ti-and-cu-ion-sequentially-implanted-sio2-and-the-involved-mechanisms
#13
Xiaoyu Mu, Xiaoyu Liu, Xiaohu Wang, Hai Tao Dai, Changlong Liu
TiO2 in nanoscale exhibits unique physicochemical and optoelectronic properties and has attracted much more interest of the researchers. In this work, TiO2 nanostructures are synthesized in amorphous SiO2 slices by implanting Ti ions, or sequentially implanting Ti and Cu ions combined with annealing at high temperature. The morphology, structure, spatial distribution and optical properties of the formed nanostructures have been investigated in detail. Our results clearly show that the thermal growth of TiO2 nanostructures in SiO2 substrate is significantly enhanced by presence of post Cu ion implantation, which depends strongly on the applied Cu ion fluence, as well as the annealing atmosphere...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155413/gas-exfoliated-porous-monolayer-boron-nitride-for-enhanced-aerobic-oxidative-desulfurization-performance
#14
Yingcheng Wu, Peiwen Wu, Yanhong Chao, Jing He, Hongping Li, Linjie Lu, Wei Jiang, Beibei Zhang, Huaming Li, Wenshuai Zhu
Hexagonal boron nitride (h-BN) has been regarded to be an efficient catalyst in aerobic oxidation field, but limited by the less-exposed active sites. In this contribution, we proposed a simple green liquid nitrogen gas exfoliation strategy for preparation of porous monolayer nanosheets (BN-1). Owing to the reduced layer numbers, decreased lateral sizes and artificially-constructed pores, increased exposure of active sites was expected, further contributed to an enhanced aerobic oxidative desulfurization performance up to ~98% of sulfur removal, achieving ultra-deep desulfurization...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155412/tunable-nanostructured-columnar-growth-of-sno2-for-efficient-detection-of-co-gas
#15
Avneet Singh, Anjali Sharma, Monika Tomar, Vinay Gupta
Present work is focused on the growth and modification of the columnar nanostructures of SnO2 using Glancing Angle Deposition (GLAD) assisted rf sputtering technique for low temperature detection of carbon monoxide (CO) gas. GLAD angle and deposition pressure have been optimized to tailor the grow of columnar nanostructures of SnO2, which exhibited enhanced gas sensing response of 1.49×102 towards 500 ppm of CO gas at a comparatively lower operating temperature of 110°C. The enhanced sensing response at low operating temperature is related to the growth of nanoporous columnar structures of SnO2 thin film under GLAD configuration which results in an enhanced interaction of target CO gas molecules with the large surface area of sensing SnO2 thin film...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155410/gate-tunable-strong-weak-localization-transition-in-few-layer-black-phosphorus
#16
Gen Long, Shuigang Xu, Xiangbin Cai, Zefei Wu, Tianyi Han, Jiangxiazi Lin, Chun Cheng, Yuan Cai, Xinran Wang, Ning Wang
Atomically-thin black phosphorus (BP) field effect transistors show strong-weak localization transition, which is tunable through gate voltages. Hopping transports through charge impurity-induced localized states are observed at low carrier density regime. Variable-range hopping model is applied to simulate scattering behaviors of charge carriers. In the high carrier concentration regime, a negative magnetoresistance indicates weak localization effects. The extracted phase coherence length is power-law temperature-dependent (~T<sup>-0...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29154254/preparation-and-characterization-of-self-assembly-hydrogels-with-exfoliated-montmorillonite-nanosheets-and-chitosan
#17
Wei Wang, Yunliang Zhao, Hao Yi, Tianxing Chen, Shichang Kang, Hongqiang Li, Shaoxian Song
Novel montmorillonite-nanosheets/chitosan (MMTNS/CS) hydrogels fabricated via self-assembly of exfoliated MMTNS and CS chains were investigated. The exfoliation of MMTNS, self-assembly mechanism and structure of MMTNS/CS hydrogels were characterized by AFM, SEM, TEM, FTIR, EDS and BET, respectively. The results indicated that MMT could be easily exfoliated to nanosheets with thickness of 1~5 nm in aqueous solution by ultrasonic base on interlayer hydration. The formation mechanism of the self-assembly hydrogels was due to the hydrogen-bond (-OH ··· +NH3-) and electrostatic interaction between the MMTNS and CS...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29148984/supercritical-diethylamine-facilitated-loading-of-ultrafine-ru-particles-on-few-layer-graphene-for-solvent-free-hydrogenation-of-levulinic-acid-to-%C3%AE-valerolactone
#18
Tao Hengcong, Jingjing Ding, Chao Xie, Yunnan Gao, Jinliang Song, Zhenyu Sun
We demonstrate a facile and versatile method to grow Ru particles uniformly on pristine few-layer graphene (FLG) in supercritical diethylamine. In particular, a large number of Ru subnanometer clusters less than 1.0 nm were observed. The particle size can be tuned by manipulating the loading content of Ru and controlling the reaction temperature. The resulting Ru/FLG showed remarkably high activity, selectivity, and reusability towards the hydrogenation of levulinic acid to γ-valerolactone. This method is flexible, and can be extended to the synthesis of a variety of other ultrafine metal particles supported on FLG...
November 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29148983/densification-of-chlorine-doped-continuous-cnt-sheet-polyvinylidene-fluoride-sandwich-film-and-improvement-of-mechanical-and-dielectric-properties
#19
Jiyong Liang, Yizhuo Gu, Zhenchong Zhang, Shaokai Wang, Min Li, Zuoguang Zhang
The compacting structure of chlorine-doped continuous CNT sheet/polyvinylidene fluoride (Cl-CNT sheet/PVDF) was successfully optimized by means of hot-press treatment to improve mechanical and dielectric properties with high densification degree. Then, the densified Cl-CNT sheet/PVDF dielectric layer was inserted between two PVDF insulating layers to fabricate sandwich composite. It is found that the dielectric and mechanical properties are effectively enhanced, with the dielectric permittivity of 40.4 (@102 Hz), dielectric loss of 0...
November 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29148429/unconventional-lithography-for-patterned-nanomaterials
#20
Yue Li, Qingfeng Yan, Naoto Koshizaki
No abstract text is available yet for this article.
November 17, 2017: Nanotechnology
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