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Silicon nanowire

Da-Chen Pang, Cheng-Min Chang
This paper presents the world's first transparent flexible capacitive micromachined ultrasonic transducer (CMUT) that was fabricated through a roll-lamination technique. This polymer-based CMUT has advantages of transparency, flexibility, and non-contacting detection which provide unique functions in display panel applications. Comprising an indium tin oxide-polyethylene terephthalate (ITO-PET) substrate, SU-8 sidewall and vibrating membranes, and silver nanowire transparent electrode, the transducer has visible-light transmittance exceeding 80% and can operate on curved surfaces with a 40 mm radius of curvature...
June 20, 2017: Sensors
Tuncay Ozel, Benjamin A Zhang, Ruixuan Gao, Robert W Day, Charles M Lieber, Daniel G Nocera
Development of new synthetic methods for the modification of nanostructures has accelerated materials design advances to furnish complex architectures. Structures based on one-dimensional (1D) silicon (Si) structures synthesized using top-down and bottom-up methods are especially prominent for diverse applications in chemistry, physics, and medicine. Yet further elaboration of these structures with distinct metal-based and polymeric materials, which could open up new opportunities, has been difficult. We present a general electrochemical method for the deposition of conformal layers of various materials onto high aspect ratio Si micro- and nanowire arrays...
June 23, 2017: Nano Letters
Juntian Qu, Xinyu Liu
In this paper, we investigate the impact of vacuum chamber conditions (cleanliness level and vacuum pressure) and imaging parameters (magnification and acceleration voltage) of scanning electron microscopy (SEM) on the contact resistance of two-point in-situ nanoprobing of nanomaterials. Using two typical types of conductive nanoprobe, two-point nanoprobing is performed on silicon nanowires, during which changing trends of the nanoprobing contact resistance with the SEM chamber conditions and imaging parameters are quantified...
June 15, 2017: Nanotechnology
Bigeng Chen, Hao Wu, Chenguang Xin, Daoxin Dai, Limin Tong
Silicon photonics has been developed successfully with a top-down fabrication technique to enable large-scale photonic integrated circuits with high reproducibility, but is limited intrinsically by the material capability for active or nonlinear applications. On the other hand, free-standing nanowires synthesized via a bottom-up growth present great material diversity and structural uniformity, but precisely assembling free-standing nanowires for on-demand photonic functionality remains a great challenge. Here we report hybrid integration of free-standing nanowires into silicon photonics with high flexibility by coupling free-standing nanowires onto target silicon waveguides that are simultaneously used for precise positioning...
June 14, 2017: Nature Communications
Chenlei Li, Daoxin Dai
A multi-channel mode (de)multiplexer based on the supermode evolution in cascaded dual-core adiabatic tapers is designed and realized with ultrathin (∼50  nm) silicon-on-insulator nanowire waveguides. This dual-core adiabatic taper is designed optimally, so that all the supermodes are confined in the wide core at the input end and the highest-order supermode is localized in the narrow core at the output end. In this way, the highest-order supermode is dropped as the fundamental mode at the cross port...
June 15, 2017: Optics Letters
Jelena Vukajlovic-Plestina, Wonjong Kim, Vladimir G Dubrovskii, Gözde Tütüncüoglu, Maxime Lagier, Heidi Potts, Martin Friedl, Anna Fontcuberta I Morral
Reproducible integration of III-V semiconductors on silicon can open new path toward CMOS compatible optoelectronics and novel design schemes in next generation solar cells. Ordered arrays of nanowires could accomplish this task, provided they are obtained in high yield and uniformity. In this work, we provide understanding on the physical factors affecting size uniformity in ordered GaAs arrays grown on silicon. We show that the length and diameter distributions in the initial stage of growth are not much influenced by the Poissonian fluctuation-induced broadening, but rather are determined by the long incubation stage...
June 14, 2017: Nano Letters
Yun Chen, Cheng Zhang, Liyi Li, Chia-Chi Tuan, Fan Wu, Xin Chen, Jian Gao, Yong Ding, Ching-Ping Wong
Silicon (Si) zigzag nanowires (NWs) have a great potential in many applications because of its high surface/volume ratio. However, fabricating Si zigzag NWs has been challenging. In this work, a diffusion-controlled metal-assisted chemical etching method is developed to fabricate Si zigzag NWs. By tailoring the composition of etchant to change its diffusivity, etching direction and etching time, various zigzag NWs can be easily fabricated. In addition, it is also found that a critical length of NW (> 1 μm) is needed to form zigzag nanowires...
June 14, 2017: Nano Letters
J Tang, J-L Maurice, F Fossard, I Florea, W Chen, E V Johnson, M Foldyna, L Yu, P Roca I Cabarrocas
Silicon nanowires have been grown by a plasma-assisted vapour-liquid-solid method using tin as the catalyst. Transmission electron microscopy in the [12[combining macron]10] zone axis shows that the diamond hexagonal (P63/mmc) crystal structure is present in several nanowires. This is the first unambiguous proof of the natural occurrence of this metastable phase to our knowledge.
June 12, 2017: Nanoscale
Chia-Yun Chen, Ta-Cheng Wei, Cheng-Ting Lin, Jheng-Yi Li
Facile, effective and reliable etching technique for the formation of uniform silicon (Si) nanowire arrays were realized through the incorporation of back substrates with metal-assisted chemical etching (MaCE). In comparison with conventional MaCE process, a dramatic increase of etching rates upon MaCE process could be found by employing the conductive back substrates on p-type Si, while additionally prevented the creation of nanopores from catalytic etching reaction. Examinations on the involving etching kinetics, morphologies, wetting behaviors and surface structures were performed that validated the role of back substrates upon MaCE process...
June 9, 2017: Scientific Reports
Jizhuang Wang, Ze Xiong, Xiaojun Zhan, Baohu Dai, Jing Zheng, Jun Liu, Jinyao Tang
Over the last decades, scientists have endeavored to develop nanoscopic machines and envisioned that these tiny machines could be exploited in biomedical applications and novel material fabrication. Here, a visible-/near-infrared light-driven nanomotor based on a single silicon nanowire is reported. The silicon nanomotor harvests energy from light and propels itself by the self-electrophoresis mechanism. Due to the high efficiency, the silicon nanowire can be readily driven by visible and near-infrared illumination at ultralow light intensity (≈3 mW cm(-2) )...
June 9, 2017: Advanced Materials
Esmat Mehrjouei, Hamed Akbarzadeh, Amir Nasser Shamkhali, Mohsen Abbaspour, Sirous Salemi, Pooya Abdi
In this work, liberation of cisplatin molecules from interior of a nanotube due to entrance of an Ag-nanowire inside it was simulated by classical molecular dynamics method. The aim of this simulation was investigation on the effects of diameter, chirality, and composition of the nanotube, as well as the influence of temperature on this process. For this purpose, single walled carbon, boron nitride, and silicon carbide nanotube were considered. In order for a more concise comparison of the results, a new parameter namely efficiency of drug release, was introduced...
June 15, 2017: Molecular Pharmaceutics
Ping Hu, Shun Dong, Xinghong Zhang, Kaixuan Gui, Guiqing Chen, Ze Hu
Several-millimeter long SiC nanowires (NWs) with unique optical properties, excellent thermal stability and flexible nanomechanical properties were synthesized using a simple method with silicon and phenolic resin as the raw materials. The SiC NWs displayed special optical properties that were attributed to their large size and Al-doping. They displayed broad green emission at 527.8 nm (2.35 eV) and purple emission concentrated at 438.9 nm (2.83 eV), in contrast to the other results, and the synthesized SiC NWs could also remain relatively stable in air up to 1000 °C indicating excellent thermal stability...
June 7, 2017: Scientific Reports
Muhammad M Mirza, Felix J Schupp, Jan A Mol, Donald A MacLaren, G Andrew D Briggs, Douglas J Paul
Junction-less nanowire transistors are being investigated to solve short channel effects in future CMOS technology. Here we demonstrate 8 nm diameter silicon nanowire junction-less transistors with metallic doping densities which demonstrate clear 1D electronic transport characteristics. The 1D regime allows excellent gate modulation with near ideal subthreshold slopes, on- to off-current ratios above 10(8) and high on-currents at room temperature. Universal conductance scaling as a function of voltage and temperature similar to previous reports of Luttinger liquids and Coulomb gap behaviour at low temperatures suggests that many body effects including electron-electron interactions are important in describing the electronic transport...
June 7, 2017: Scientific Reports
Grigore Leahu, Emilija Petronijevic, Alessandro Belardini, Marco Centini, Roberto Li Voti, Teemu Hakkarainen, Eero Koivusalo, Mircea Guina, Concita Sibilia
III-V semiconductors nanowires (NW) have recently attracted a significant interest for their potential application in the development of high efficiency, highly-integrated photonic devices and in particular for the possibility to integrate direct bandgap materials with silicon-based devices. Here we report the absorbance properties of GaAs-AlGaAs-GaAs core-shell-supershell NWs using photo-acoustic spectroscopy (PAS) measurements in the spectral range from 300 nm to 1100 nm wavelengths. The NWs were fabricated by self-catalyzed growth on Si substrates and their dimensions (length ~5 μm, diameter ~140-150 nm) allow for the coupling of the incident light to the guided modes in near-infrared (IR) part of the spectrum...
June 6, 2017: Scientific Reports
Ruiyuan Liu, Jie Wang, Teng Sun, Mingjun Wang, Changsheng Wu, Haiyang Zou, Tao Song, Xiaohong Zhang, Shuit-Tong Lee, Zhong Lin Wang, Baoquan Sun
An integrated self-charging power unit, combining a hybrid silicon nanowire/polymer heterojunction solar cell with a polypyrrole-based supercapacitor, has been demonstrated to simultaneously harvest solar energy and store it. By efficiency enhancement of the hybrid nanowire solar cells and a dual-functional titanium film serving as conjunct electrode of the solar cell and supercapacitor, the integrated system is able to yield a total photoelectric conversion to storage efficiency of 10.5%, which is the record value in all the integrated solar energy conversion and storage system...
June 9, 2017: Nano Letters
Vincent Le Borgne, Marta Agati, Simona Boninelli, Paola Castrucci, Maurizio De Crescenzi, Richard Dolbec, My Ali El Khakani
We report on a method for the extraction of silicon nanowires (SiNWs) from the by-product of a plasma torch based spheroidization process of silicon. This by-product is a nanopowder which consists of a mixture of SiNWs and silicon particles. By optimizing a centrifugation based process, we were able to extract substantial amounts of highly pure Si nanomaterials (mainly SiNWs and Si nanospheres (SiNSs)). While the purified SiNWs were found to have typical outer diameters in the 10-15 nm range and lengths of up to several µm, the SiNSs have external diameters in the 10-100 nm range...
June 6, 2017: Nanotechnology
Lester U Vinzons, Lei Shu, SenPo Yip, Chun-Yuen Wong, Leanne L H Chan, Johnny C Ho
Many potential applications of porous silicon nanowires (SiNWs) fabricated with metal-assisted chemical etching are highly dependent on the precise control of morphology for device optimization. However, the effects of key etching parameters, such as the amount of deposited metal catalyst, HF-oxidant molar ratio (χ), and solvent concentration, on the morphology and etching kinetics of the SiNWs still have not been fully explored. Here, the changes in the nanostructure and etch rate of degenerately doped p-type silicon in a HF-H2O2-H2O etching system with electrolessly deposited silver catalyst are systematically investigated...
December 2017: Nanoscale Research Letters
Dianyu Shen, Zhaolin Zhan, Zhiduo Liu, Yong Cao, Li Zhou, Yuanli Liu, Wen Dai, Kazuhito Nishimura, Chaoyang Li, Cheng-Te Lin, Nan Jiang, Jinhong Yu
In this study, we report a facile approach to fabricate epoxy composite incorporated with silicon carbide nanowires (SiC NWs). The thermal conductivity of epoxy/SiC NWs composites was thoroughly investigated. The thermal conductivity of epoxy/SiC NWs composites with 3.0 wt% filler reached 0.449 Wm(-1) K(-1), approximately a 106% enhancement as compared to neat epoxy. In contrast, the same mass fraction of silicon carbide micron particles (SiC MPs) incorporated into epoxy matrix showed less improvement on thermal conduction properties...
June 1, 2017: Scientific Reports
Hongwei Xu, Biao Dong, Shihan Xu, Sai Xu, Xueke Sun, Jiao Sun, Yudan Yang, Lin Xu, Xue Bai, Shuang Zhang, Ze Yin, Hongwei Song
Detection and isolation of circulating tumor cells (CTCs) play a pivotal role in the diagnosis and prognosis of cancer, while the high capture efficiency and purity of CTCs are difficult to achieve simultaneously among the various isolation methods. In this work, we designed an inverted microchip integrating silicon nanowires (SiNWs) and multifunctional magnetic nanocomposites (Fe3O4@C6/Ce6@silane, Coumarin 6 (C6), Chlorin e6 (Ce6)) for enhanced capture efficiency and purity of CTCs. The Fe3O4@C6/Ce6@silane conjugated with antibody can label the CTCs and pull them to the upside SiNWs capture surface by the upward magnetic field with high purity...
May 22, 2017: Biomaterials
Abderrahmane Hamdi, Ioana Silvia Hosu, Ahmed Addad, Ruben Hartkoorn, Hervé Drobecq, Oleg Melnyk, Hatem Ezzaouia, Rabah Boukherroub, Yannick Coffinier
Here, we report for the first time, the use of molybdenum disulfide/titanium oxide/silicon nanowires (MoS2/TiO2/SiNW) surfaces for SALDI-MS detection as alternative to MALDI-MS method. Silicon nanowires were fabricated by the well-known metal-assisted chemical etching process followed by the deposition of TiO2 by atomic layer deposition. MoS2 deposition was achieved through hydrothermal treatment. The MoS2/TiO2/SiNW substrate has shown high performance for the detection of small compounds of different molecular weights, including glutathione, glucose, amino acids, antibiotics to name a few...
August 15, 2017: Talanta
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