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Silicon nanowire

Yu Jen Jan, Jie-Fu Chen, Yazhen Zhu, Yi-Tsung Lu, Szu Hao Chen, Howard Chung, Matthew Smalley, Yen-Wen Huang, Jiantong Dong, Hsiao-Hua Yu, James S Tomlinson, Shuang Hou, Vatche G Agopian, Edwin M Posadas, Hsian-Rong Tseng
Circulating tumor cells (CTCs) are cancer cells shredded from either a primary tumor or a metastatic site and circulate in the blood as the potential cellular origin of metastasis. By detecting and analyzing CTCs, we will be able to noninvasively monitor disease progression in individual cancer patients and obtain insightful information for assessing disease status, thus realizing the concept of "tumor liquid biopsy". However, it is technically challenging to identify CTCs in patient blood samples because of the extremely low abundance of CTCs among a large number of hematologic cells...
March 15, 2018: Advanced Drug Delivery Reviews
Alireza Alikhani, Milad Gharooni, Hamed Abiri, Fatemeh Farokhmanesh, Mohammad Abdolahad
Monitoring the pH dependent behavior of normal and cancer cells by impedimetric biosensor based on Silicon Nanowires (SiNWs) was introduced to diagnose the invasive cancer cells. Autophagy as a biologically activated process in invasive cancer cells during acidosis, protect them from apoptosis in lower pH which presented in our work. As the autophagy is the only activated pathways which can maintain cellular proliferation in acidic media, responses of SiNW-ECIS in acidified cells could be correlated to the probability of autophagy activation in normal or cancer cells...
February 22, 2018: Journal of Pharmaceutical and Biomedical Analysis
Yuwei Hao, Hongliang Liu, Guannan Li, Haijun Cui, Lei Jiang, Shutao Wang
To overcome the low efficiency of single-responsive smart surfaces, we have constructed a dual-responsive smart surface - poly(spiropyran-co-N-isopropylacrylamide) (poly(SP-co-NiPAAm))-grafted silicon nanowire arrays - by combining photo-responsive SP and thermo-responsive NiPAAm units for enhancing efficiencies of cancer cell capture and release. These enhanced efficiencies of cancer cell capture and release probably originate from the binary cooperative effect of two responsive building units: NiPAAm units can decrease the steric hindrance between SP units during the isomerization while SP units can facilitate phase transition of NiPAAm units...
March 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Matthew J Catenacci, Christopher Reyes, Mutya A Cruz, Benjamin J Wiley
Materials that retain a high conductivity under strain are essential for wearable electronics. This article describes a conductive, stretchable composite consisting of a Cu-Ag core-shell nanowire felt infiltrated with a silicone elastomer. This composite exhibits a retention of conductivity under strain that is superior to any composite with a conductivity greater than 1000 S cm-1 . This work also shows how the mechanical properties, conductivity, and deformation mechanism of the composite changes as a function of the stiffness of the silicone matrix...
March 14, 2018: ACS Nano
Xiongzhang Liu, Ran Guo, Senjing Zhang, Qingda Li, Genki Saito, Xuemei Yi, Takahiro Nomura
Silicon nitride (Si3N4) products with different nanostructure morphologies and different phases for Si3N4 ceramic with high thermal conductivity were synthesized by a direct nitriding method. NaCl and NH4Cl were added to raw Si powders, and the reaction was carried out under a nitrogen gas flow of 100 mL/min. The phase composition and morphologies of the products were systemically characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HR-TEM)...
March 14, 2018: ACS Applied Materials & Interfaces
Jeremie Maire, Roman Anufriev, Takuma Hori, Junichiro Shiomi, Sebastian Volz, Masahiro Nomura
Semiconductor nanowires are potential building blocks for future thermoelectrics because of their low thermal conductivity. Recent theoretical works suggest that thermal conductivity of nanowires can be further reduced by additional constrictions, pillars or wings. Here, we experimentally study heat conduction in silicon nanowires with periodic wings, called fishbone nanowires. We find that like in pristine nanowires, the nanowire cross-section controls thermal conductivity of fishbone nanowires. However, the periodic wings further reduce the thermal conductivity...
March 13, 2018: Scientific Reports
Luxi Peng, Jinxiu Wen, Huanjun Chen, Zebo Zheng, Ningsheng Xu, Jun Chen, Shaozhi Deng, Fei Liu
Boron is a narrow-bandgap (1.56 eV) semiconductor with high melting-point, low-density, large Young's modulus and very high refractive index (3.03) close to silicon. Therefore, boron nanostructures is expected to possess strong visible-light scattering properties. However, photonic and optoelectronic properties of the boron nanostructures are seldom studied until now. In this paper, we have successfully prepared single-crystalline boron nanowire (BNW) arrays with high-density on Si substrate. All the BNWs are found to possess strong light-scattering behaviors in the visible regime...
March 12, 2018: Small
Anping Cao, Meixia Shan, Laura Paltrinieri, Wiel H Evers, Liangyong Chu, Lukasz Poltorak, Johan H Klootwijk, Beatriz Seoane, Jorge Gascon, Ernst J R Sudhölter, Louis C P M de Smet
Recently various porous organic frameworks (POFs, crystalline or amorphous materials) have been discovered, and used for a wide range of applications, including molecular separations and catalysis. Silicon nanowires (SiNWs) have been extensively studied for diverse applications, including as transistors, solar cells, lithium ion batteries and sensors. Here we demonstrate the functionalization of SiNW surfaces with POFs and explore its effect on the electrical sensing properties of SiNW-based devices. The surface modification by POFs was easily achieved by polycondensation on amine-modified SiNWs...
March 9, 2018: Nanoscale
Lei Su, Hongjie Wang, Min Niu, Xingyu Fan, Mingbo Ma, Zhongqi Shi, Sheng-Wu Guo
Ultralight ceramic aerogels with the property combination of recoverable compressibility and excellent high-temperature stability are attractive for use in harsh environments. However, conventional ceramic aerogels are usually constructed by oxide ceramic nanoparticles, and their practical applications have always been limited by the brittle nature of ceramics and volume shrinkage at high temperature. Silicon carbide (SiC) nanowire offers the integrated properties of elasticity and flexibility of one-dimensional (1D) nanomaterials and superior high-temperature thermal and chemical stability of SiC ceramics, which makes it a promising building block for compressible ceramic nanowire aerogels (NWAs)...
March 7, 2018: ACS Nano
Yoonkook Son, Soojin Sim, Hyunsoo Ma, Min Choi, Yeonguk Son, Noejung Park, Jaephil Cho, Minjoon Park
Despite the advantage of high capacity, the practical use of the silicon anode is still hindered by large volume expansion during the severe pulverization lithiation process, which results in electrical contact loss and rapid capacity fading. Here, a combined electrochemical and computational study on the factor for accommodating volume expansion of silicon-based anodes is shown. 1D silicon-based nanostructures with different internal spaces to explore the effect of spatial ratio of voids and their distribution degree inside the fibers on structural stability are designed...
March 7, 2018: Advanced Materials
Klas Tybrandt, Dion Khodagholy, Bernd Dielacher, Flurin Stauffer, Aline F Renz, György Buzsáki, János Vörös
Electrical interfacing with neural tissue is key to advancing diagnosis and therapies for neurological disorders, as well as providing detailed information about neural signals. A challenge for creating long-term stable interfaces between electronics and neural tissue is the huge mechanical mismatch between the systems. So far, materials and fabrication processes have restricted the development of soft electrode grids able to combine high performance, long-term stability, and high electrode density, aspects all essential for neural interfacing...
February 28, 2018: Advanced Materials
Fransisco de Santiago, Alejandro Trejo Baños, Alvaro Miranda, Fernando Salazar Posadas, Eliel Carvajal, Luis A Perez, Miguel Cruz-Irisson
Silicon nanowires (SiNWs) are considered as potential chemical sensors due to their large surface-to-volume ratio and their possible integration into arrays for nanotechnological applications. Detection of harmful gases like CO has been experimentally demonstrated, however, the influence of doping on the sensing capacity of SiNWs has not yet been reported. For this work, we theoretically studied the surface adsorption of a CO molecule on hydrogen-passivated SiNWs grown along the [111] crystallographic direction and compared it with the adsorption of other molecules such as NO, and O<sub>2</sub>...
February 26, 2018: Nanotechnology
Sergei Vlassov, Sven Oras, Mikk Antsov, Jelena Butikova, Rünno Lõhmus, Boris Polyakov
High surface energy of individual nanostructures leads to high adhesion and static friction that can completely hinder the operation of nanoscale systems with movable parts. For instance, silver or gold nanowires cannot be moved on silicon substrate without plastic deformation. In this paper we experimentally demonstrate the operational prototype of low-friction nano-joint. The movable part of the prototype is made either from gold or silver nano-pin produced by laser-induced partial melting of silver and gold nanowires resulting in formation of rounded bulbs on their ends...
February 22, 2018: Nanotechnology
Zhenyu Zhang, Junfeng Cui, Bo Wang, Haiyue Jiang, Guoxin Chen, Jinhong Yu, Chengte Lin, Chun Tang, Alexander Hartmaier, Junjie Zhang, Jun Luo, Andreas Rosenkranz, Nan Jiang, Dongming Guo
Silicon carbide (SiC) is widely used in harsh environments and under extreme conditions, including at high-power, high-temperature, high-current, high-voltage and high-frequency. The rebonding and self-matching of stack faults (SFs) is highly desirable to avoid catastrophic failure for SiC devices, especially for specific applications in the aerospace and nuclear power industries. In this study, a novel approach was developed using an eyebrow hair to pick up and transfer nanowires (NWs), in order to obtain in situ transmission electron microscope (TEM) images of the rebonding and self-matching of SFs at atomic resolution...
February 20, 2018: Nanoscale
Ramya Parameswaran, João L Carvalho-de-Souza, Yuanwen Jiang, Michael J Burke, John F Zimmerman, Kelliann Koehler, Andrew W Phillips, Jaeseok Yi, Erin J Adams, Francisco Bezanilla, Bozhi Tian
Optical methods for modulating cellular behaviour are promising for both fundamental and clinical applications. However, most available methods are either mechanically invasive, require genetic manipulation of target cells or cannot provide subcellular specificity. Here, we address all these issues by showing optical neuromodulation with free-standing coaxial p-type/intrinsic/n-type silicon nanowires. We reveal the presence of atomic gold on the nanowire surfaces, likely due to gold diffusion during the material growth...
February 19, 2018: Nature Nanotechnology
Xiaojie Zhang, Junhui He
The Co-Fe prussian blue coordination polymer modified Silicon nanowires array (SiNW@CoHCF array) exhibits promising behavior in photoelectrochemical (PEC) water oxidation, giving rise to a largely enhanced photocurrent density and stability, much superior to those of SiNW-based photoanodes. The CoHCF shell as effective co-catalyst increases the reaction kinetics, thus depressing the charge recombination rate, as well as protects SiNWs array photoanode from photocorrosion. It is found that the CoHCF significantly decreases the charge transfer impedance (Rct), which means that the CoHCF facilitates majority transport and collection...
August 1, 2018: Journal of Nanoscience and Nanotechnology
Chih-Hung Lin, Shoou-Jinn Chang, Ting-Jen Hsueh
The ZnO nanostructure environmental sensors were prepared via the three-dimensional through silicon via (3D-TSV) technique. For 3D-TSV, the diameter and length of the Si via were about 200 and 400 μm, respectively. For nitrogen oxide (NO), the measured responses were around ~12, ~16, and ~20% when the concentrations of the injected NO gas were 20, 40 and 60 ppm, respectively. For humidity and temperature sensing, the measured nanowire current increased logarithmically with increasing chamber temperature. The response to relative humidity increased with increasing temperature...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Yasir Hashim
This study explores optimization of resistance load (R-Load) of four silicon nanowire transistor (SiNWT)-based static random-access memory (SRAM) cell. Noise margins and inflection voltage of butterfly characteristics with static power consumption of SRAM cell are used as limiting factors in this optimization. Range of R-Load used in this study was 20-1000 KΩ with Vdd = 1 V. Results indicate that optimization depends critically on resistance load value. The optimized range of R-Load is 100-200 KΩ.
February 1, 2018: Journal of Nanoscience and Nanotechnology
Xiangyu Jiang, Pengbo Zhang, Juan Zhang, Jilei Wang, Gaofei Li, Xiaohong Fang, Liyou Yang, Xiaoyuan Chen
Hybrid heterojunction solar cells (HHSCs) have gained extensive research and attention due to simple device structure and low-cost technological processes. Here, HHSCs are presented based on a highly transparent conductive polymer poly(3,4ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS) directly spin-coated on an n-type crystalline silicon with microscale surface textures, which are prepared by traditional chemical etching. We have studied interface properties between PEDOT:PSS and textured n-Si by varying coating conditions...
February 14, 2018: Nanoscale Research Letters
Xiaojie Zhang, Junhui He
We herein report a facile approach to passivate Si(100) nanowires (SiNWs) array by methylation and poly(3,4-ethylenedioxythiophene) (PEDOT) coating as stable photoanode in aqueous electrolytes. The photoanode was stable in both acid and base electrolytes. This facile approach deals with both the dangling bond and the anti-corrosion protection of SiNWs array. A combination of microstructural characterization, photoelectrochemical (PEC) measurements and electrochemical impedance spectroscopy (EIS) analysis were employed to confirm the methyl-terminated SiNWs/PEDOT (CH3-SiNWs/PEDOT) array structure and the role of methylation in enhancing the photocurrent of SiNWs array photoanode...
April 1, 2018: Journal of Nanoscience and Nanotechnology
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