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Silicon nanowire

Peng Liu, Xianxiong He, Jiahuan Ren, Qing Liao, Jiannian Yao, Hongbing Fu
Fabrication of semiconductor nanowire laser arrays with multi-color outputs are very challenging, owing to difficulties in direct monolithic growth and patterning of III-V semiconductors on silicon substrates. Recently, methylammonium lead halide perovskites (MAPbX3, X = Cl, Br, I) have emerged as an important class of high-performance solution-processed optoelectronic materials. Here, we combined the 'top-down' fabricated polydimethylsiloxane (PDMS) rectangular groove-template (RGT) with the 'bottom-up' solution self-assembly together to prepare large-scale perovskite nanowire (PNW) arrays...
May 18, 2017: ACS Nano
Roman Anufriev, Aymeric Ramiere, Jeremie Maire, Masahiro Nomura
Unlike classical heat diffusion at macroscale, nanoscale heat conduction can occur without energy dissipation because phonons can ballistically travel in straight lines for hundreds of nanometres. Nevertheless, despite recent experimental evidence of such ballistic phonon transport, control over its directionality, and thus its practical use, remains a challenge, as the directions of individual phonons are chaotic. Here, we show a method to control the directionality of ballistic phonon transport using silicon membranes with arrays of holes...
May 18, 2017: Nature Communications
Qiuting Yan, Lipao Fang, Jiyu Wei, Guipeng Xiao, Meihong Lv, Quanhong Ma, Chunfeng Liu, Wang Wang
Owing to its biocompatibility, noncytotoxicity, biodegradability and three-dimensional structure, vertically silicon nanowires (SiNWs) arrays are a promising scaffold material for tissue engineering, regenerative medicine and relevant medical applications. Recently, its osteogenic differentiation effects, reorganization of cytoskeleton and regulation of the fate on stem cells have been demonstrated. However, it still remains unknown whether SiNWs arrays could affect the proliferation and neuronal differentiation of neural stem cells (NSCs) or not...
May 11, 2017: Journal of Biomaterials Science. Polymer Edition
Leisheng Jin, Lijie Li
In this work, nonlinear dynamics of silicon nanowire resonator considering nonlocal effect has been investigated. For the first time, dynamical parameters (e.g., resonant frequency, Duffing coefficient, and the damping ratio) that directly influence the nonlinear dynamics of the nanostructure have been derived. Subsequently, by calculating their response with the varied nonlocal coefficient, it is unveiled that the nonlocal effect makes more obvious impacts at the starting range (from zero to a small value), while the impact of nonlocal effect becomes weaker when the nonlocal term reaches to a certain threshold value...
December 2017: Nanoscale Research Letters
Amin Abnavi, Mojtaba Sadati Faramarzi, Ali Abdollahi, Reza Ramezani, Shahnaz Ghasemi, Zeinab Sanaee
Here, we report 3D hierarchical SnO<sub>2</sub> nanowires (NWs) core-amorphous Silicon shell on free-standing carbon nanotube paper (SnO<sub>2</sub>@a-Si/CNT paper) as an effective anode for flexible Lithium ion battery (LIB) application. This binder-free electrode exhibits a high initial discharge capacity of 3020 mAh/g with a large reversible charge capacity of 1250 mAh/g at a current density of 250 mA/g. Compared to other SnO<sub>2</sub> NW or its core-shell nanostructure anodes, the fabricated SnO<sub>2</sub>@a-Si/CNT structure demonstrates an outstanding performance with high mass loading (⁓5...
May 5, 2017: Nanotechnology
Dong Il Shim, Geehong Choi, Namkyu Lee, Taehwan Kim, Beom Seok Kim, Hyung Hee Cho
Enhancing the critical heat flux (CHF), which is the capacity of heat dissipation, is important to secure high stability in two-phase cooling systems. Coolant supply to a dry hot spot is a major mechanism to prevent surface burn-out for enhancing the CHF. Here, we demonstrate a more ready supply of coolant using aligned silicon nanowires (A-SiNWs), with a high aspect ratio (>10) compared to that of conventional random silicon nanowires (R-SiNWs), which have a disordered arrangement, for additional CHF improvement...
May 12, 2017: ACS Applied Materials & Interfaces
Ali Kandemir, Ayberk Ozden, Tahir Cagin, Cem Sevik
Various theoretical and experimental methods are utilized to investigate the thermal conductivity of nanostructured materials; this is a critical parameter to increase performance of thermoelectric devices. Among these methods, equilibrium molecular dynamics (EMD) is an accurate technique to predict lattice thermal conductivity. In this study, by means of systematic EMD simulations, thermal conductivity of bulk Si-Ge structures (pristine, alloy and superlattice) and their nanostructured one dimensional forms with square and circular cross-section geometries (asymmetric and symmetric) are calculated for different crystallographic directions...
2017: Science and Technology of Advanced Materials
Reuben M Bakker, Ye Feng Yu, Ramón Paniagua-Domínguez, Boris Luk'yanchuk, Arseniy I Kuznetsov
Subwavelength confined waveguiding is experimentally demonstrated with high refractive index dielectric nanoparticles with photon energy propagation at distances beyond 500 μm. These particles have naturally occurring electric and magnetic dipole resonances. When they are placed in a 1D chain, the magnetic resonances of adjacent elements couple to each other, providing a means to transport energy at visible or NIR wavelengths in a confined mode. Chains of nanoparticles made of silicon were fabricated and guided waves were measured with near-field scanning optical microscopy...
May 8, 2017: Nano Letters
Trinity Joshi, Ji-Hun Kang, Lili Jiang, Sheng Wang, Theron Tarigo, Tairu Lyu, Salman Kahn, Zhiwen Shi, Yuen-Ron Shen, Michael F Crommie, Feng Wang
Surface plasmons (SPs) and phonon polaritons (PhPs) are two distinctive quasiparticles resulting from the strong coupling of photons with electrons and optical phonons, respectively. In this Letter, we investigate the interactions between one-dimensional (1D) plasmons in silver nanowires with two-dimensional (2D) surface phonon polaritons of the silicon carbide (SiC) substrate. Using near-field infrared spectroscopy of the silver nanowire-SiC heterostructure at wavelengths close to the phonon resonance of SiC, we observe that the 1D plasmon dispersion is strongly modified by the 2D phonon polaritons in SiC...
May 3, 2017: Nano Letters
Daejong Yang, Hyunjun Cho, Sukmo Koo, Sagar R Vaidyanathan, Kelly Woo, Youngzoon Yoon, Hyuck Choo
It is well known that gold nanoparticle (AuNP) clusters generate strong surface-enhanced Raman scattering (SERS). In order to produce spatially uniform Raman-enhancing substrates at a large scale, we synthesized vertically perforated three-dimensional (3D) AuNP stacks. The 3D stacks were fabricated by first hydrothermally synthesizing ZnO nanowires perpendicular to silicon wafers followed by repetitively performing liquid-phase deposition of AuNPs on the tops and side surfaces of the nanowires. During the deposition process, the nanowires were shown to gradually dissolve away, leaving hollow vestiges or perforations surrounded by stacks of AuNPs...
April 28, 2017: ACS Applied Materials & Interfaces
Jing He, Jianjun Zhu, Bin Jiang, Yulan Zhao
The diagnostic and prognostic value of microRNAs (miRNAs) in diseases becomes promising. Owing to fast response and high sensitivity, silicon nanowire (SiNW) biosensor has been considered a potential tool for miRNAs detection. Here, we describe a booming method to detect miRNAs with poly-silicon nanowire biosensors. Standard and real miRNA samples are applied in this study. The results show a limitation of 1 fM in the detection of standard miRNA sample with our poly-nanowire devices. Meanwhile, one-base mismatched sequence could be distinguished...
2017: Methods in Molecular Biology
Chia-Yun Chen, Po-Hsuan Hsiao, Ta-Cheng Wei, Ting-Chen Chen, Chien-Hsin Tang
Recently, silicon (Si) nanowires have been intensively applied for a wide range of optoelectronic applications. Nevertheless, rare explorations considering the photodegradation of organic pollutants based on Si nanowires were performed, and they still require vast improvement, in particular for their degradation efficiency. In this study, broad-band and high efficiency photocatalytic systems were demonstrated through the good incorporation of Si nanowires with highly fluorescent carbon nanodots. The photodegradation rate of these intriguing heterostructure arrays under a 580 nm light illumination is approximately 6 times higher than that of sole Si nanowires, and more than 3...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
Dirk König, Daniel Hiller, Sebastian Gutsch, Margit Zacharias, Sean Smith
All electronic, optoelectronic or photovoltaic applications of silicon depend on controlling majority charge carriers via doping with impurity atoms. Nanoscale silicon is omnipresent in fundamental research (quantum dots, nanowires) but also approached in future technology nodes of the microelectronics industry. In general, silicon nanovolumes, irrespective of their intended purpose, suffer from effects that impede conventional doping due to fundamental physical principles such as out-diffusion, statistics of small numbers, quantum- or dielectric confinement...
April 20, 2017: Scientific Reports
Yan Jin, Yingling Tan, Xiaozhen Hu, Bin Zhu, Qinghui Zheng, Zijiao Zhang, Guoying Zhu, Qian Yu, Zhong Jin, Jia Zhu
Alloy anodes possessed of high theoretical capacity show great potential for next-generation advanced lithium-ion battery. Even though huge volume change during lithium insertion and extraction leads to severe problems, such as pulverization and an unstable solid-electrolyte interphase (SEI), various nanostructures including nanoparticles, nanowires, and porous networks can address related challenges to improve electrochemical performance. However, the complex and expensive fabrication process hinders the widespread application of nanostructured alloy anodes, which generate an urgent demand of low-cost and scalable processes to fabricate building blocks with fine controls of size, morphology, and porosity...
April 25, 2017: ACS Applied Materials & Interfaces
Yuan Li, John Dykes, Todd Gilliam, Nitin Chopra
Heterostructures of one-dimensional nanowire supported graphene/plasmonic nanoparticles are promising for future SERS-based chemical sensors. In this paper, we report a novel heterostructured SERS substrate composed of free-standing Si nanowires and surface-decorating Au/graphene nanoparticles. We successfully developed a unique CVD approach for the cost-effective and large-scale growth of free-standing Si nanowires. Au nanoparticles were decorated on the Si nanowires using a galvanic deposition - an annealing approach...
April 20, 2017: Nanoscale
A S Trifonov, D E Presnov, I V Bozhev, D A Evplov, V Desmaris, V A Krupenin
We report on the new active tip for scanning probe microscopy allowing the simultaneous measurements of surface topography and its potential profile. We designed and fabricated a field-effect transistor with nanowire channel located on the apex of silicon-on-insulator small chip. The field-effect transistor with nanowire channel was selected due to its extremely high electric field sensitivity even at room temperature. We developed the scanning probe operated in the tuning fork regime and demonstrated its reasonable spatial and field resolution...
March 28, 2017: Ultramicroscopy
Peter Knittel, Nicolas Hibst, Boris Mizaikoff, Steffen Strehle, Christine Kranz
In this study, high-aspect ratio silicon nanowire (SiNW) - modified atomic force microscopy (AFM) probes are fabricated using focused ion beam (FIB) microfabrication technology and vapor-solid-solid synthesis. Commercially available soft silicon nitride probes are used for localized nanowire growth yielding soft high-aspect ratio AFM probes. The SiNW-modified cantilevers are used here for imaging in PeakForce Tappingۛ (PFT) mode, which offers high force control along with valuable information about tip-sample adhesion...
March 28, 2017: Ultramicroscopy
Ulrike Blumröder, Matthias Zilk, Hannes Hempel, Patrick Hoyer, Thomas Pertsch, Rainer Eichberger, Thomas Unold, Stefan Nolte
The influence of structure geometry on THz emission from Black Silicon (BS) surfaces fabricated by reactive ion etching (RIE) has been investigated by a comprehensive study including optical simulations, optical-pump THz probe and THz emission studies. A strong enhancement of THz emission is observed with increasing structure depth, which is mainly related to the increased number of carriers created within the silicon needles and not due to the overall absorption enhancement as previously claimed for silicon nanowires...
March 20, 2017: Optics Express
Xuefei Qin, Zihuan Xia, Yonggang Wu, Jian Zhou, Zongyi Zhang
Silicon nanowire-based arrays have demonstrated superior light trapping properties and great potential for next-generation photovoltaics. In this paper, we propose a perpendicular elliptical nanocone (PENC) array solar cell, which introduces an asymmetry in the direction parallel to the array surface in addition to the asymmetry in the direction normal to the array surface, which has been implemented in the circular nanocone (CNC) array. The PENC array displays more and higher resonant absorption peaks in the long wavelength compared with the CNC array...
March 10, 2017: Applied Optics
Jiawen Lu, Xuexi Sheng, Guoqing Tong, Zhongwei Yu, Xiaolin Sun, Linwei Yu, Xiangxin Xu, Junzhuan Wang, Jun Xu, Yi Shi, Kunji Chen
Inorganic CsPbX3 (X = Cl, Br, I, or hybrid among them) perovskite quantum dots (IPQDs) are promising building blocks for exploring high performance optoelectronic applications. In this work, the authors report a new hybrid structure that marries CsPbX3 IPQDs to silicon nanowires (SiNWs) radial junction structures to achieve ultrafast and highly sensitive ultraviolet (UV) detection in solar-blind spectrum. A compact and uniform deployment of CsPbX3 IPQDs upon the sidewall of low-reflective 3D radial junctions enables a strong light field excitation and efficient down-conversion of the ultraviolet incidences, which are directly tailored into emission bands optimized for a rapid photodetection in surrounding ultrathin radial p-i-n junctions...
March 29, 2017: Advanced Materials
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