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Silicon nanowire

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https://www.readbyqxmd.com/read/28087483/cell-number-per-spheroid-and-electrical-conductivity-of-nanowires-influence-the-function-of-silicon-nanowired-human-cardiac-spheroids
#1
Yu Tan, Dylan Richards, Robert C Coyle, Jenny Yao, Ruoyu Xu, Wenyu Gou, Hongjun Wang, Donald R Menick, Bozhi Tian, Ying Mei
: Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) provide an unlimited cell source to treat cardiovascular diseases, the leading cause of death worldwide. However, current hiPSC-CMs retain an immature phenotype that leads to difficulties for integration with adult myocardium after transplantation. To address this, we recently utilized electrically conductive silicon nanowires (e-SiNWs) to facilitate self-assembly of hiPSC-CMs to form nanowired hiPSC cardiac spheroids...
January 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28076951/a-multiscale-study-of-plasmonic-scattering-and-light-trapping-effect-in-silicon-nanowire-array-solar-cells
#2
Lingyi Meng, Yu Zhang, ChiYung Yam
Nanometallic structures that support surface plasmons provide new ways to confine light at deep-subwavelength scales. In this paper, the effect of light scattering in nanowire array solar cells is studied by a multiscale approach combining classical electromagnetics (EM) and quantum mechanical (QM) simulations. A photovoltaic device is constructed by integrating a silicon nanowire array with a plasmonic silver nanosphere. The light scatterings by plasmonic element and nanowire array are obtained via classical EM simulations while current-voltage characteristics and optical properties of the nanowire cells are evaluated quantum mechanically...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28073264/metal-organic-polyhedra-coated-si-nanowires-for-the-sensitive-detection-of-trace-explosives
#3
Anping Cao, Wei Zhu, Jin Shang, Johan H Klootwijk, Ernst J R Sudhölter, Jurriaan Huskens, Louis C P M de Smet
Surface-modified silicon nanowire-based field-effect transistors (SiNW-FETs) have proven to be a promising platform for molecular recognition in miniature sensors. In this work, we present a novel nanoFET device for the sensitive and selective detection of explosives based on affinity layers of metal-organic polyhedra (MOPs). The judicious selection of the geometric and electronic characteristics of the assembly units (organic ligands and unsaturated metal site) embedded within the MOP cage allowed for the formation of multiple charge-transfer (CT) interactions to facilitate the selective explosive inclusion...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28073028/multiplexed-detection-of-lung-cancer-biomarkers-in-patients-serum-with-cmos-compatible-silicon-nanowire-arrays
#4
Anran Gao, Xun Yang, Jing Tong, Lin Zhou, Yuelin Wang, Jianlong Zhao, Hongju Mao, Tie Li
In this work, a real-time assay for highly sensitive, label-free, multiplexed electrical detection of lung cancer biomarkers was developed by using silicon nanowire field-effect (SiNW-FET) devices. Highly responsive SiNW arrays were fabricated using a CMOS-compatible anisotropic self-stop etching technique with mass reproducibility and low cost character. The SiNW nanosensor was integrated with PDMS microfluidic device, which allows rapid analyte delivery, makes the analysis to be conducted using exceedingly small samples and enables potential multiplexed detection...
January 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28071603/heterogeneous-nucleation-of-catalyst-free-inas-nanowires-on-silicon
#5
U P Gomes, D Ercolani, V Zannier, S Battiato, E Ubyivovk, V Mikhailovskii, Y Murata, S Heun, F Beltram, L Sorba
We report on the heterogeneous nucleation of catalyst-free InAs nanowires on Si(111) substrates by chemical beam epitaxy. We show that nanowire nucleation is enhanced by sputtering the silicon substrate with energetic particles. We argue that particle bombardment introduces lattice defects on the silicon surface that serve as preferential nucleation sites. The formation of these nucleation sites can be controlled by the sputtering parameters, allowing the control of nanowire density in a wide range. Nanowire nucleation is accompanied by unwanted parasitic islands, but careful choice of annealing and growth temperature allows us to strongly reduce the relative density of these islands and to realize samples with high nanowire yield...
January 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28067929/bandgap-tunable-csx-ch3nh3-1-xpbi3-perovskite-nanowires-by-aqueous-solution-synthesis-for-optoelectronic-devices
#6
Dongdong Dong, Hui Deng, Chao Hu, Huaibing Song, Keke Qiao, Xiaokun Yang, Jian Zhang, Fensha Cai, Jiang Tang, Haisheng Song
To date, all the lead halide based full-inorganic or organic-inorganic hybrid perovskites have been synthesized from organic solvent, such as N,N-dimethylformamide (DMF) or dimethyl sulfoxide (DMSO), by a solution method. Herein, water has been utilized as a 'green' solvent to develop an efficient synthetic route to grow various kinds of lead halide perovskite nanowires (NWs). By controlling the proportion of the hybrid cations, Csx(CH3NH3)1-xPbI3 perovskite NWs were successfully synthesized. Every Csx(CH3NH3)1-xPbI3 perovskite NW demonstrated single crystal characteristics with uniform stoichiometric element distribution...
January 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28067037/controlling-the-geometries-of-si-nanowires-through-tunable-nanosphere-lithography
#7
Luping Li, Yin Fang, Cheng Xu, Yang Zhao, Kedi Wu, Connor Limburg, Peng Jiang, Kirk J Ziegler
A tunable nanosphere lithography (NSL) technique is combined with metal-assisted etching of silicon (Si) to fabricate ordered, high-aspect-ratio Si nanowires. Non-close-packed structures are directly prepared via shear-induced ordering of the nanospheres. The spacing between the nanospheres is independent of their diameters and tuned by changing the loading of nanospheres. Nanowires with spacings between 110-850 nm are easily achieved with diameters between 100-550 nm. By eliminating plasma or heat treatment of the nanospheres, the diameter of the nanowires fabricated is nearly identical to the nanosphere diameter in the suspension...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28059281/enhanced-light-harvesting-capability-for-silicon-single-nanowire-solar-cells-coupled-with-metallic-cavity
#8
Feng Gai, Cheng Zhang, Yaohui Zhan, Xiaofeng Li
Single-nanowire solar cells (SNSCs) are attracting increasing interest due to their unique optical antenna effect beneficial for achieving higher light-trapping capability. However, for conventional circular-cross-sectional SNSCs, the light-trapping performance is still far from the expectation. Here we demonstrate that integrating a silicon single nanowire into a metallic slit can dramatically enhance the absorption efficiency over almost the whole spectral band due to strengthened optical antenna effect. Especially, it is found that by using finite-size metallic blocks to form a nanoscale metallic cavity, the light-trapping performance of the SNSCs can be further improved...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28054936/silicon-and-germanium-nanowire-electronics-physics-of-conventional-and-unconventional-transistors
#9
Walter M Weber, Thomas Mikolajick
Research in the field of electronics of one-dimensional group-IV semiconductor structures has attracted increasing attention over the past 15 years. The exceptional combination of the unique one-dimensional electronic transport properties with the mature material know-how of highly integrated silicon and germanium technology holds the promise of enhancing state-of-the-art electronics. In addition of providing conduction channels that can bring conventional field effect transistors to the uttermost scaling limits, the physics of 1-D group IV nanowires endows new device principles...
January 5, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28050613/strain-induced-structural-defects-and-their-effects-on-the-electrochemical-performances-of-silicon-core-germanium-shell-nanowire-heterostructures
#10
Yung-Chen Lin, Dongheun Kim, Zhen Li, Binh-Minh Nguyen, Nan Li, Shixiong Zhang, Jinkyoung Yoo
We report on strain-induced structural defect formation in core Si nanowires of a Si/Ge core/shell nanowire heterostructure and the influence of the structural defects on the electrochemical performances in lithium-ion battery anodes based on Si/Ge core/shell nanowire heterostructures. The induced structural defects consisting of stacking faults and dislocations in the core Si nanowire were observed for the first time. The generation of stacking faults in the Si/Ge core/shell nanowire heterostructure is observed to prefer settling in either only the Ge shell region or in both the Ge shell and Si core regions and is associated with the increase of the shell volume fraction...
January 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28028534/cellular-uptake-and-dynamics-of-unlabeled-freestanding-silicon-nanowires
#11
John F Zimmerman, Ramya Parameswaran, Graeme Murray, Yucai Wang, Michael Burke, Bozhi Tian
The ability to seamlessly merge electronic devices with biological systems at the cellular length scale is an exciting prospect for exploring new fundamental cell biology and in designing next-generation therapeutic devices. Semiconductor nanowires are well suited for achieving this goal because of their intrinsic size and wide range of possible configurations. However, current studies have focused primarily on delivering substrate-bound nanowire devices through mechanical abrasion or electroporation, with these bulkier substrates negating many of the inherent benefits of using nanoscale materials...
December 2016: Science Advances
https://www.readbyqxmd.com/read/28005897/phase-sensitive-tomography-of-the-joint-spectral-amplitude-of-photon-pair-sources
#12
Iman Jizan, Bryn Bell, L G Helt, Alvaro Casas Bedoya, Chunle Xiong, Benjamin J Eggleton
We present a novel measurement technique to perform full phase-sensitive tomography on the joint spectrum of photon pair sources, using stimulated four-wave mixing and phase-sensitive amplification. Applying this method to an integrated silicon nanowire source with a frequency chirped pump laser, we are able to observe a corresponding phase change in the spectral amplitude that would otherwise be hidden in standard intensity measurements. With a highly nonlinear fiber source, we show that phase-sensitive measurements have superior sensitivity to small spectral features when compared to intensity measurements...
October 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/28005386/length-scale-of-diffusive-phonon-transport-in-suspended-thin-silicon-nanowires
#13
Shyamprasad N Raja, Reto Rhyner, Kantawong Vuttivorakulchai, Mathieu Luisier, Dimos Poulikakos
Recent experimental advances have revealed that the mean free path (mfp) of phonons contributing significantly to thermal transport in crystalline semiconductors can be several microns long. Almost all of these experiments are based on bulk and thin film materials and use techniques that are not directly applicable to nanowires. By developing a process with which we could fabricate multiple electrically contacted and suspended segments on individual heavily doped smooth Silicon nanowires, we measured phonon transport across varying length scales using a DC self-heating technique...
January 3, 2017: Nano Letters
https://www.readbyqxmd.com/read/28001429/single-crystalline-hexagonal-silicon-germanium
#14
Håkon Ikaros T Hauge, Sonia Conesa-Boj, Marcel A Verheijen, Sebastian Koelling, Erik P A M Bakkers
Group IV materials with the hexagonal diamond crystal structure have been predicted to exhibit promising optical and electronic properties. In particular, hexagonal silicon-germanium (Si1-xGex) should be characterized by a tunable direct band gap with implications ranging from Si-based light-emitting diodes to lasers and quantum dots for single photon emitters. Here we demonstrate the feasibility of high-quality defect-free and wafer-scale hexagonal Si1-xGex growth with precise control of the alloy composition and layer thickness...
December 27, 2016: Nano Letters
https://www.readbyqxmd.com/read/27996010/super-resolution-imaging-of-light-matter-interactions-near-single-semiconductor-nanowires
#15
Eric Johlin, Jacopo Solari, Sander A Mann, Jia Wang, Thomas S Shimizu, Erik C Garnett
Nanophotonics is becoming invaluable for an expanding range of applications, from controlling the spontaneous emission rate and the directionality of quantum emitters, to reducing material requirements of solar cells by an order of magnitude. These effects are highly dependent on the near field of the nanostructure, which constitutes the evanescent fields from propagating and resonant localized modes. Although the interactions between quantum emitters and nanophotonic structures are increasingly well understood theoretically, directly imaging these interactions experimentally remains challenging...
December 20, 2016: Nature Communications
https://www.readbyqxmd.com/read/27966477/application-of-metal-nanowire-networks-on-hydrogenated-amorphous-silicon-thin-film-solar-cells
#16
Shouyi Xie, Guofu Hou, Peizhuan Chen, Baohua Jia, Min Gu
We demonstrate the application of metal nanowire (NW) networks as transparent electrode on hydrogenated amorphous Si (a-Si:H) solar cells. We first systematically investigate the optical performances of the metal NW networks on a-Si:H solar cells in different electrode configurations through numerical simulations to fully understand the mechanisms to guide the experiments. The theoretically optimized configuration is discovered to be metal NWs sandwiched between a 40 nm indium tin oxide (ITO) layer and a 20 nm ITO layer...
December 14, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27960468/heteroepitaxial-writing-of-silicon-on-sapphire-nanowires
#17
Mingkun Xu, Zhaoguo Xue, Jimmy Wang, Yaolong Zhao, Yao Duan, Guangyao Zhu, Linwei Yu, Jun Xu, Junzhuan Wang, Yi Shi, Kunji Chen, Pere Roca I Cabarrocas
The heteroepitaxial growth of crystal silicon thin films on sapphire, usually referred to as SoS, has been a key technology for high-speed mixed-signal integrated circuits and processors. Here, we report a novel nanoscale SoS heteroepitaxial growth that resembles the in-plane writing of self-aligned silicon nanowires (SiNWs) on R-plane sapphire. During a low-temperature growth at <350 °C, compared to that required for conventional SoS fabrication at >900 °C, the bottom heterointerface cultivates crystalline Si pyramid seeds within the catalyst droplet, while the vertical SiNW/catalyst interface subsequently threads the seeds into continuous nanowires, producing self-oriented in-plane SiNWs that follow a set of crystallographic directions of the sapphire substrate...
December 14, 2016: Nano Letters
https://www.readbyqxmd.com/read/27960457/parallel-nanoshaping-of-brittle-semiconductor-nanowires-for-strained-electronics
#18
Yaowu Hu, Ji Li, Jifa Tian, Yi Xuan, Biwei Deng, Kelly L McNear, Daw Gen Lim, Yong Chen, Chen Yang, Gary J Cheng
Semiconductor nanowires (SCNWs) provide a unique tunability of electro-optical property than their bulk counterparts (e.g., polycrystalline thin films) due to size effects. Nanoscale straining of SCNWs is desirable to enable new ways to tune the properties of SCNWs, such as electronic transport, band structure, and quantum properties. However, there are two bottlenecks to prevent the real applications of straining engineering of SCNWs: strainability and scalability. Unlike metallic nanowires which are highly flexible and mechanically robust for parallel shaping, SCNWs are brittle in nature and could easily break at strains slightly higher than their elastic limits...
December 14, 2016: Nano Letters
https://www.readbyqxmd.com/read/27934970/surface-characteristics-of-silicon-nanowires-nanowalls-subjected-to-octadecyltrichlorosilane-deposition-and-n-octadecane-coating
#19
Bekir Sami Yilbas, Billel Salhi, Muhammad Rizwan Yousaf, Fahad Al-Sulaiman, Haider Ali, Nasser Al-Aqeeli
In this study, nanowires/nanowalls were generated on a silicon wafer through a chemical etching method. Octadecyltrichlorosilane (OTS) was deposited onto the nanowire/nanowall surfaces to alter their hydrophobicity. The hydrophobic characteristics of the surfaces were further modified via a 1.5-μm-thick layer of n-octadecane coating on the OTS-deposited surface. The hydrophobic characteristics of the resulting surfaces were assessed using the sessile water droplet method. Scratch and ultraviolet (UV)-visible reflectivity tests were conducted to measure the friction coefficient and reflectivity of the surfaces...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27933818/atomic-layer-deposited-coatings-on-nanowires-for-high-temperature-water-corrosion-protection
#20
Alexander S Yersak, Ryan J Lewis, Li-Anne Liew, Rongfu Wen, Ronggui Yang, Yung-Cheng Lee
Two-phase liquid-cooling technologies incorporating micro/nanostructured copper or silicon surfaces have been established as a promising thermal management solution to keep up with the increasing power demands of high power electronics. However, the reliability of nanometer-scale features of copper and silicon in these devices has not been well investigated. In this work, accelerated corrosion testing reveals that copper nanowires are not immune to corrosion in deaerated pure hot water. To solve this problem, we investigate atomic layer deposition (ALD) TiO2 coatings grown at 150 and 175 °C...
November 30, 2016: ACS Applied Materials & Interfaces
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