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Akarsh Verma, Avinash Parashar
Aim of this article is to study the effects of functional groups such as hydroxyl, epoxide and carboxyl on the fracture toughness of graphene. These functional groups form the backbone of intrinsic atomic structure of graphene oxide (GO). Molecular dynamics based simulations were performed in conjunction with reactive force field parameters to capture the Mode-I fracture toughness of functionalised graphene. Simulations were performed in stages, to study the effect of these functional groups, individually as well as altogether on the fracture toughness of GO nanosheet...
January 18, 2018: Nanotechnology
Zenghui Wu, Guoan Tai, Xufeng Wang, Tingsong Hu, Rui Wang, Wanlin Guo
Compared with MoS2 and WS2, the selenide analogues have narrower band gaps and higher electron mobilities, which make them more applicable to real electrical devices. Besides, few-layered metal selenides have higher electrical conductivity, carrier mobility and light absorption than the corresponding monolayers. However, the large-scale and high-quality growth of few-layered metal selenides remains a significant challenge. Here, we develop a facile method to grow large-area and highly-crystalline few-layered MoSe2 by directly selenizing the Mo foil surfaces at 550 oC within 60 min under ambient pressure...
January 18, 2018: Nanotechnology
Feiying Sun, Liangping Xia, Changbin Nie, Jun Shen, Yixuan Zou, Guiyu Cheng, Hao Wu, Yong Zhang, Dongshan Wei, Shaoyun Yin, Chunlei Du
The all-optical modulators based on graphene show great promise for on-chip optical interconnect. However, the modulation performance of all-optical modulators is usually based on graphene and fiber interaction, limiting their potential in high integration. Based on this point, the all-optical modulator in dielectric-loaded waveguide (DLW) with graphene-silicon heterojunction structure (GSH) is proposed. The DLW raises the waveguide mode which provides a strong light-graphene interaction. And sufficient tuning of graphene Fermi energy beyond the Pauli blocking effect is obtained with the presented GSH structure...
January 18, 2018: Nanotechnology
Qianqian Du, Jiandong Ye, Zhonghua Xu, Shunming Zhu, Kun Tang, Shulin Gu, Youdou Zheng
Recently, ZnO nanowire field effect transistors (FETs) have received renewed interest due to their extraordinary low dimensionality and high sensitivity to external chemical environment and illumination conditions. These prominent properties have the promising potential in the nanoscale chemical and photo-sensors. In this article, we have fabricated ZnO nanowire FETs and have found hysteresis behaviors in their transfer characteristics. The mechanism and dynamics of the hysteresis phenomena have been investigated in detail by varying the sweeping rate and range of the gate bias with and without light irradiation...
January 18, 2018: Nanotechnology
Sejeong Won, DoVan Lam, Jin Young Lee, Hyun-June Jung, Min Hur, Kwang-Seop Kim, Hak-Joo Lee, Jae-Hyun Kim
We propose an alumina-deposited double-layer graphene as a transparent, scalable, and stretchable barrier against moisture; this barrier is indispensable for foldable or stretchable organic displays and electronics. Both the barrier property and stretchability were significantly enhanced through the introduction of double-layer graphene between alumina and a polymeric substrate. Double-layer graphene with negligible polymeric residues was coated on the polymeric substrate via a scalable dry transfer method in a roll-to-roll manner; an alumina layer was deposited on the graphene via atomic layer deposition...
January 18, 2018: Nanotechnology
Caroline Celle, Anthony Cabos, Thomas Fontecave, Bruno Laguitton, Anass Benayad, Laure Guettaz, Nathalie Pélissier, Viet Huong Nguyen, Daniel Bellet, David Muñoz-Rojas, Jean-Pierre Simonato
Whereas the integration of silver nanowires in functional devices has reached a fair level of maturity, the integration of copper nanowires still remains difficult, mainly due to the intrinsic instability of copper nanowires in ambient conditions. In this paper, copper nanowire based transparent electrodes with good performances (33 Ω sq-1 associated with 88% transparency) were obtained, and their degradation in different conditions was monitored, in particular by electrical measurements, transmission electron microscopy, x-ray photoelectron spectrometry and Auger electron spectroscopy...
January 17, 2018: Nanotechnology
Guohui Yu, Jingdong Hu, Jianping Tan, Yang Gao, Yongfeng Lu, Fu-Zhen Xuan
Pressure sensors with high performance (e.g., a broad pressure sensing range, high sensitivities, rapid response/relaxation speeds, temperature-stable sensing), as well as a cost-effective and highly efficient fabrication method are highly desired for electronic skins. In this research, a high-performance pressure sensor based on microstructured carbon nanotube/polydimethylsiloxane arrays was fabricated using an ultra-violet/ozone (UV/O3) microengineering technique. The UV/O3 microengineering technique is controllable, cost-effective, and highly efficient since it is conducted at room temperature in an ambient environment...
January 17, 2018: Nanotechnology
Yu Wen, Dehong Xia
The purpose of this study is to provide scientific guidance for morphological control of nanoparticle synthesis by gas phase method. A universal thermodynamics model is developed to predict morphology of nanoparticles fabricated by inert gas condensation method. By the use of the model, morphologies of aluminum nanocrystals are predicted under various preparation conditions. There are two kinds of energies that determine the formation of nanoparticles morphology jointly, which are Gibbs free energy for nanoparticles and energy variation during the process...
January 17, 2018: Nanotechnology
Vladimir Blank, Valentin Churkin, Boris Kulnitskiy, Igor A Perezhogin, Alexey Kirichenko, Viktor Denisov, Sergey Erohin, Pavel Sorokin, Mikhail Popov
Phase diagrams of carbon, and those focusing on the graphite-to-diamond transitional conditions in particular, are of great interest for fundamental and applied research. The present study introduces a number of experiments carried out to convert graphite under high-pressure conditions, showing a formation of stable phase of fullerene-type onions cross-linked by sp3-bonds in the 55-115 GPa pressure range instead of diamonds formation (even at temperature 2000-3000 K) and the already formed diamonds turn into carbon onions...
January 17, 2018: Nanotechnology
Suyun Tian, Guannan Zhu, Yanping Tang, Xiaohua Xie, Qian Wang, Yufei Ma, Gu Qiao Ding, Xiaoming Xie
Various graphene-based Si nanocomposites have been reported to improve the performance of active materials in Li ion battery. However, these candidates still yield severe capacity fading due to the electrical disconnection and fracture caused by huge volume changes with extended cycles.Therefore, we design a novel three-dimensional cross-linking structure of graphene and single-wall carbon nanotube to encapsulate Si nanoparticles. The synthesized three-dimensional structure is ascribed to the excellent self-assembly of carbon nanotube with graphene oxide and a thermal treatment process at 900 ºC...
January 17, 2018: Nanotechnology
Neta Arad-Vosk, Rotem Beach, Amichai Ron, Tzvi Tzvi Templeman, Yuval Golan, Gabby Sarusi, Amir Sa'ar
Thin films of lead sulfide alloyed with thorium and oxygen were deposited on GaAs substrates and processed to produce a photo-diode structure. Structural, optical and electrical characterizations indicate the presence of small nanoscale domains that are characterized by dense packaging, high quality interfaces and a blue-shift of the energy bandgap toward the short wavelength infrared range of the spectrum. Photocurrent spectroscopy revealed a considerable photo-conductivity that is correlated with excitation of carriers in the nanoscale domains of lead sulfide alloyed with thorium and oxygen...
January 17, 2018: Nanotechnology
Dao-Ming Zhu, Wei Xie, Yu-Sha Xiao, Meng Suo, Ming-Hui Zan, Qing-Quan Liao, Xue-Jia Hu, Li-Ben Chen, Bei Chen, Wen-Tao Wu, Li-Wei Ji, Hui-Ming Huang, Shi-Shang Guo, Xing-Zhong Zhao, Quan-Yan Liu, Wei Liu
Recently, red blood cell (RBC) membrane-coated nanoparticles have attracted much attention because of their excellent immune escapability; meanwhile, gold nanocages (AuNs) have been extensively used for cancer therapy due to their photothermal effect and drug delivery capability. The combination of the RBC membrane coating and AuNs may provide an effective approach for targeted cancer therapy. However, few reports have shown the utilization of combining these two technologies. Here, we design erythrocyte membrane-coated gold nanocages for targeted photothermal and chemical cancer therapy...
January 17, 2018: Nanotechnology
Xudong Wang, Yan Chen, Guangjian Wu, Jianlu Wang, Bobo Tian, Shuo Sun, Hong Shen, Tie Lin, Wei-Da Hu, Tingting Kang, Minghua Tang, Yongguang Xiao, Jinglan Sun, Xiangjian Meng, Junhao Chu
Graphene has received numerous attention for future nanoelectronics and optoelectronics. The Dirac point is a key parameter of graphene that provides information about its carrier properties. There are lots of methods to tune the Dirac point of graphene, such as chemical doping, impurities, defects, and disorder. In this study, we report a different approach to tune the Dirac point of graphene using a ferroelectric polarization field. The Dirac point can be adjusted to near the ferroelectric coercive voltage regardless its original position...
January 17, 2018: Nanotechnology
Dongzhi Fu, Xingchen Pan, Zhanbin Bai, Fucong Fei, Gilberto Umana-Membreno, Honglian Song, Xuelin Wang, Baigeng Wang, Fengqi Song
We fabricated nanodevices of Mo<sub>x</sub>W<sub>1-x</sub>Te<sub>2</sub> (x =0, 0.07, 0.35) and conducted systematic comparative study of their electrical transport. Magnetoresistance measurements show that Mo doping can significantly suppress the mobility and magnetoresistance. The results for the analysis of two band model (TBM) show that the doping of Mo does not break the carrier balance. By Shubnikov-de Haas oscillations (SdHO) analysis, we found that Mo doping also has a strong suppress on the quantum oscillation of the sample, and the higher the ratio of Mo is, the fewer the pockets observed in our experiments are...
January 16, 2018: Nanotechnology
Guoke Xing, Ke Wang, Ping Li, Wenqin Wang, Tao Chen
In this study, in situ generation of Ag nanostructure with different morphology on poly(acrylic acid) (PAA) brushes grafted graphene oxide (GO) as substrates for surface-enhanced Raman scattering (SERS) is demonstrated. The whole synthetic strategy involved the load of Ag precursor ions ((Ag+ and [Ag(NH3)2]+) in PAA brushes grafted GO, followed by their in situ reduction to Ag nanostructure with different morphology with a reducing agent (NaBH4 or ascorbic acid). Novel 3D hierarchical flowerlike Ag nanostructures could be obtained by using AgNO3 as precursors and ascorbic acid as a reducing agent...
January 16, 2018: Nanotechnology
Cheng Song, Yunfeng You, Xianzhe Chen, Xiaofeng Zhou, Yuyan Wang, Feng Pan
Antiferromagnetic materials, which have drawn considerable attention recently, have fascinating features: they are robust against perturbation, produce no stray fields, and exhibit ultrafast dynamics. Discerning how to efficiently manipulate the magnetic state of an antiferromagnet is key to the development of antiferromagnetic spintronics. In this review, we introduce four main methods (magnetic, strain, electrical, and optical) to mediate the magnetic states and elaborate on intrinsic origins of different antiferromagnetic materials...
January 16, 2018: Nanotechnology
Lu Hanlun, Min Zhi Rong, Ming Qiu Zhang
A quadrupole electric field mediated exfoliation method is proposed to convert micron sized hexagonal boron nitride (hBN) powders into few layers hexagonal boron nitride nano-sheets (h-BNNS). Under the optimum conditions (400 Hz, 40 V, 32μg/mL, sodium deoxycholate, TAE medium), the hBN powders (thickness > 200 nm, horizontal scale ~ 10 μm) are successfully exfoliated into 0.5-4 nm (1-10 layers) thick h-BNNS with the same horizontal scale. Dynamic laser scattering (DLS) and atomic force microscope (AFM) statistics show that the yield is 47...
January 16, 2018: Nanotechnology
Qingying Luo, Lin Liu, Cai Yang, Jing Yuan, Hongtao Feng, Yan Chen, Peng Zhao, Zhiqiang Yu, Zongwen Jin
MicroRNAs (miRNAs) are single stranded endogenous molecules composed of only 18-24 nucleotides which are critical for gene expression regulating the translation of messenger RNAs. Conventional methods based on enzyme-assisted nucleic acid amplification techniques have many problems, such as easy contamination, high cost, susceptibility to false amplification, and tendency to have sequence mismatches.Here we report a rapid, ratiometric, enzyme-free, sensitive, and highly selective single-step miRNA detection using three-way junction assembled (or self-assembled) FRET probes...
January 16, 2018: Nanotechnology
Guang Yang, Yanmin Yang, Hongran Ma, Xiujuan Mao, Congcong Li, Jie Li, Qiang Zhang, Zhidong Zhang, Fuxing Yin, Jia Li
The structural, electronic and magnetic properties of Cr, Mn, Fe, Co and Ni-doped bilayer WSe2 are predicted by using first principles calculations. The doped transition-metal atoms show a covalent-binding with the nearest Se atoms. The calculated electronic structures reveal that the transition metal Cr, Mn, Fe and Co-doped bilayer WSe2 exhibit the half-metallic character with a 100% spin polarization at the Fermi level, and the reason is ascribed to the strong hybridization peak between the transition metals and parent W and Se atoms...
January 16, 2018: Nanotechnology
Giancarlo Corti, Justin L Brown, Negar Rajabi, Dave N McIlroy
The growth efficiency of one dimension(1D) nanostructures via the vapor-liquid-solid process is commonly attributed to parameters such as precursor vapor pressure, substrate temperature, and the choice of the catalyst. The work presented herein is an investigation of the use of silica nanosprings (SN) as a 3D substrate for improving the growth efficiency of SN themselves. Silica nanosprings are a 1D nanomaterial that form a nonwoven structure with optimal geometric characteristics and surface properties that mitigate collisions between growing nanosprings and ripening of the gold catalyst, which should improve SN yield...
January 16, 2018: Nanotechnology
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