Read by QxMD icon Read

Silicon nanowire

Naveen K Mahenderkar, Qingzhi Chen, Ying-Chau Liu, Alexander R Duchild, Seth Hofheins, Eric Chason, Jay A Switzer
We introduce a simple and inexpensive procedure for epitaxial lift-off of wafer-size flexible and transparent foils of single-crystal gold using silicon as a template. Lateral electrochemical undergrowth of a sacrificial SiO x layer was achieved by photoelectrochemically oxidizing silicon under light irradiation. A 28-nanometer-thick gold foil with a sheet resistance of 7 ohms per square showed only a 4% increase in resistance after 4000 bending cycles. A flexible organic light-emitting diode based on tris(bipyridyl)ruthenium(II) that was spin-coated on a foil exploited the transmittance and flexibility of the gold foil...
March 17, 2017: Science
B Janjua, H Sun, C Zhao, D H Anjum, F Wu, A A Alhamoud, X Li, A M Albadri, A Y Alyamani, M M El-Desouki, T K Ng, B S Ooi
The growth of self-assembled, vertically oriented and uniform nanowires (NWs) has remained a challenge for efficient light-emitting devices. Here, we demonstrate dislocation-free AlGaN NWs with spontaneous coalescence, which are grown by plasma-assisted molecular beam epitaxy on an n-type doped silicon (100) substrate. A high density of NWs (filling factor >95%) was achieved under optimized growth conditions, enabling device fabrication without planarization using ultraviolet (UV)-absorbing polymer materials...
March 14, 2017: Nanoscale
Yun Chen, Cheng Zhang, Liyi Li, Chia-Chi Tuan, Xin Chen, Jian Gao, Yunbo He, Ching-Ping Wong
Kinked silicon nanowires (KSiNWs) have many special properties that make them attractive for a number of applications. The mechanical properties of KSiNWs play important roles in the performance of sensors. In this work, the effects of defects on the mechanical properties of KSiNWs are studied using molecular dynamics simulations and indirectly validated by experiments. It is found that kinks are weak points in the nanowire (NW) because of inharmonious deformation, resulting in a smaller elastic modulus than that of straight NWs...
December 2017: Nanoscale Research Letters
Hsun-Feng Hsu, Chun-An Chen, Shang-Wu Liu, Chun-Kai Tang
Ni-silicide/Si nanowires were fabricated by atomic force microscope nano-oxidation on silicon-on-insulator substrates, selective wet etching, and reactive deposition epitaxy. Ni-silicide nanocrystal-modified Si nanowire and Ni-silicide/Si heterostructure multi-stacked nanowire were formed by low- and high-coverage depositions of Ni, respectively. The Ni-silicide/Si Schottky junction and Ni-silicide region were attributed high- and low-resistance parts of nanowire, respectively, causing the resistance of the Ni-silicide nanocrystal-modified Si nanowire and the Ni-silicide/Si heterostructure multi-stacked nanowire to be a little higher and much lower than that of Si nanowire...
December 2017: Nanoscale Research Letters
Murat Kuscu, Ozgur B Akan
Molecular communication (MC) is a bio-inspired communication method based on the exchange of molecules for information transfer among nanoscale devices. Although MC has been extensively studied from various aspects, limitations imposed by the physical design of transceiving units have been largely neglected in the literature. Recently, we have proposed a nanobioelectronic MC receiver architecture based on the nanoscale field effect transistor-based biosensor (bioFET) technology, providing noninvasive and sensitive molecular detection at nanoscale while producing electrical signals at the output...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Niraj K Vishwakarma, Ajay K Singh, Yoon-Ho Hwang, Dong-Hyeon Ko, Jin-Oh Kim, A Giridhar Babu, Dong-Pyo Kim
Simultaneous capture of carbon dioxide (CO2) and its utilization with subsequent work-up would significantly enhance the competitiveness of CO2-based sustainable chemistry over petroleum-based chemistry. Here we report an interfacial catalytic reaction platform for an integrated autonomous process of simultaneously capturing/fixing CO2 in gas-liquid laminar flow with subsequently providing a work-up step. The continuous-flow microreactor has built-in silicon nanowires (SiNWs) with immobilized ionic liquid catalysts on tips of cone-shaped nanowire bundles...
March 6, 2017: Nature Communications
Kelly McNear, Yimin Huang, Chen Yang
BACKGROUND: Understanding how cells interact with nanomaterials is important for rational design of nanomaterials for nanomedicine and transforming them for clinical applications. Particularly, the mechanism for one-dimensional (1D) nanomaterials with high aspect ratios still remains unclear. RESULTS: In this work, we present amine-functionalized silicon nanowires (SiNW-NH2) entering CHO-β cells via a physical membrane wrapping mechanism. By utilizing optical microscopy, transmission electron microscopy, and confocal fluorescence microscopy, we successfully visualized the key steps of internalization of SiNW-NH2 into cells...
March 1, 2017: Journal of Nanobiotechnology
Ying-Pin Wu, Chia-Jung Chu, Li-Chu Tsai, Yawen Su, Pei-Hua Chen, Mathew Moodley, Ding Huang, Yit-Tsong Chen, Ying-Jay Yang, Chii-Dong Chen
We report on a technique that can extend the use of nanowire sensors to the detection of interactions involving nonpolar and neutral molecules in ionic solution environment. This technique makes use of the fact that molecular interactions result in a change in the permittivity of the involving molecules. For the interactions taking place at the surface of nanowires, this permittivity change can be determined from the analysis of the measured nanowire complex impedance. To demonstrate this technique, histidine with different charge polarities controlled by the solutions pH value was detected, including the detection of electrically neutral histidine at a sensitivity of 1 pM...
March 1, 2017: Nanotechnology
Gil Shalev
The electrostatically formed nanowire (EFN) gas sensor is based on a multiple-gate field-effect transistor with a conducting nanowire, which is not defined physically; rather, the nanowire is defined electrostatically post-fabrication, by using appropriate biasing of the different surrounding gates. The EFN is fabricated by using standard silicon processing technologies with relaxed design rules and, thereby, supports the realization of a low-cost and robust gas sensor, suitable for mass production. Although the smallest lithographic definition is higher than half a micrometer, appropriate tuning of the biasing of the gates concludes a conducting channel with a tunable diameter, which can transform the conducting channel into a nanowire with a diameter smaller than 20 nm...
February 26, 2017: Sensors
Ievgen Kurylo, Mathieu Dupré, Sonia Cantel, Christine Enjalbal, Hervé Drobecq, Sabine Szunerits, Oleg Melnyk, Rabah Boukherroub, Yannick Coffinier
In this paper, we report an original method to immobilize a model peptide on silicon nanowires (SiNWs) via a photolinker attached to the SiNWs' surface. The silicon nanowires were fabricated by a metal assisted chemical etching (MACE) method. Then, direct characterization of the peptide immobilization on SiNWs was performed either by X-ray photoelectron spectroscopy (XPS) or by laser-desorption/ionization mass spectrometry (LDI-MS). XPS allowed us to follow the peptide immobilization and its photorelease by recording the variation of the signal intensities of the different elements present on the SiNW surface...
March 13, 2017: Analyst
Fredrik Gustav Lindelöw, Cezar Zota, Erik Lind
InGaAs nanowires is one of the promising material systems of replacing silicon in future CMOS transistors, due to its high electron mobility, in combination with the excellent electrostatic control from the tri-gate geometry. In this article, we report on gated Hall measurements on single and multiple In0.85Ga0.15As nanowires, selectively grown in a Hall bridge geometry with nanowire widths down to 50 nm and thicknesses of 10 nm. The gated nanowires can be used as junctionless transistors, which allows for a simplified device processing as no regrowth of contact layer or ion implantation is needed, which is especially beneficial as transistor dimensions are scaled down...
February 23, 2017: Nanotechnology
Murat Kuscu, Ozgur B Akan, Murat Kuscu, Ozgur B Akan, Ozgur B Akan, Murat Kuscu
Molecular communication (MC) is a bio-inspired communication method based on the exchange of molecules for information transfer among nanoscale devices. Although MC has been extensively studied from various aspects, limitations imposed by the physical design of transceiving units have been largely neglected in the literature. Recently, we have proposed a nanobioelectronic MC receiver architecture based on the nanoscale field effect transistor-based biosensor (bioFET) technology, providing noninvasive and sensitive molecular detection at nanoscale while producing electrical signals at the output...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Huaiyan Sun, Xinyu Jin, Feng Jiang, Ruifeng Zhang
A Zinc Oxide (ZnO) nanowires/ macroporous Silicon dioxide (SiO2 ) composite was used as support to immobilize horseradish peroxidase (HRP) simply by in-situ cross-linking method. As cross-linker was adsorbed on the surface of ZnO nanowires, the cross-linked HRP was quite different from the traditional cross-linking enzyme aggregates (CLEAs) on both structure and catalytic performance. Among three epoxy compounds diethylene glycol diglycidyl ether (DDE) was the best cross-linker, with which the loading amount of HRP with pI of 5...
February 21, 2017: Biotechnology and Applied Biochemistry
Stepan Nichkalo, Anatoly Druzhinin, Anatoliy Evtukh, Oleg Bratus', Olga Steblova
This work pertains to the method for modification of silicon (Si) wafer morphology by metal-assisted chemical etching (MacEtch) technique suitable for fabrication of antireflective Si surfaces. For this purpose, we made different Au catalyst patterns on the surface of Si substrate. This modification allowed to obtain the close-packed Au nanodrop (ND) pattern that generates the nanowires (NWs) and the well-separated Au NDs, which induce the nanopore (NP) formation. The antireflective properties of these structures in comparison with NWs produced by the conventional Ag-MacEtch method were analysed...
December 2017: Nanoscale Research Letters
Mustafa Yılmaz, Nicole Wollschläger, Mohammad Nasr Esfahani, Werner Österle, Yusuf Leblebici, B Erdem Alaca
Silica nanowires spanning 10 μm-deep trenches are fabricated from different types of silsesquioxane-based precursors by direct e-beam patterning on silicon followed by release through deep reactive ion etching. Nanowire aspect ratios as large as 150 are achieved with a critical dimension of about 50 nm and nearly rectangular cross-sections. In situ bending tests are carried out inside a scanning electron microscope, where the etch depth of 10 [Formula: see text] provides sufficient space for deformation. Silica NWs are indeed observed to exhibit superplastic behavior without fracture with deflections reaching the full etch depth, about two orders of magnitude larger than the nanowire thickness...
February 16, 2017: Nanotechnology
P Lagonegro, F Rossi, C Galli, A Smerieri, R Alinovi, S Pinelli, T Rimoldi, G Attolini, G Macaluso, C Macaluso, S E Saddow, G Salviati
GOAL: Nanowires are promising biomaterials in multiple clinical applications. The goal of this study was to investigate the cytotoxicity of carbon-doped silica nanowires (SiOxCy NWs) on a fibroblastic cell line in vitro. MATERIALS AND METHODS: SiOxCy NWs were grown on Si substrates by CVD process. Murine L929 fibroblasts were cultured in complete DMEM and indirect and direct cytotoxicity tests were performed in agreement with ISO 19003-5, by quantitating cell viability at MTT and chemiluminescent assay...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Cheol-Min Lim, In-Kyu Lee, Ki Joong Lee, Young Kyoung Oh, Yong-Beom Shin, Won-Ju Cho
This work describes the construction of a sensitive, stable, and label-free sensor based on a dual-gate field-effect transistor (DG FET), in which uniformly distributed and size-controlled silicon nanowire (SiNW) arrays by nanoimprint lithography act as conductor channels. Compared to previous DG FETs with a planar-type silicon channel layer, the constructed SiNW DG FETs exhibited superior electrical properties including a higher capacitive-coupling ratio of 18.0 and a lower off-state leakage current under high-temperature stress...
2017: Science and Technology of Advanced Materials
Q D Zhuang, H Alradhi, Z M Jin, X R Chen, J Shao, X Chen, Ana M Sanchez, Y C Cao, J Y Liu, P Yates, K Durose, C J Jin
InAsSb nanowires (NWs) with a high Sb content have potential in the fabrication of advanced silicon-based optoelectronics such as infrared photondetectors/emitters and highly sensitive phototransistors, as well as in the generation of renewable electricity. However, producing optically efficient InAsSb NWs with a high Sb content remains a challenge, and optical emission is limited to 4.0 μm due to the quality of the nanowires. Here, we report, for the first time, the success of high-quality and optically efficient InAsSb NWs enabling silicon-based optoelectronics operating in entirely mid-wavelength infrared...
March 10, 2017: Nanotechnology
Laura Andolfi, Anna Murello, Damiano Cassese, Jelena Ban, Simone Dal Zilio, Marco Lazzarino
Cell-cell and cell-matrix interactions are essential to the survival and proliferation of most cells, and are responsible for triggering a wide range of biochemical pathways. More recently, the biomechanical role of those interactions was highlighted, showing, for instance, that adhesion forces are essential for cytoskeleton organization. Silicon nanowires (Si NWs) with their small size, high aspect ratio and anisotropic mechanical response represent a useful model to investigate the forces involved in the adhesion processes and their role in cellular development...
April 18, 2017: Nanotechnology
Janneke Veerbeek, Liang Ye, Wouter Vijselaar, Tibor Kudernac, Wilfred G van der Wiel, Jurriaan Huskens
Controlling the doping concentration of silicon nanostructures is challenging. Here, we investigated three different monolayer doping techniques to obtain silicon nanowires with a high doping dose. These routes were based on conventional monolayer doping, starting from covalently bound dopant-containing molecules, or on monolayer contact doping, in which a source substrate coated with a monolayer of a carborane silane was the dopant source. As a third route, both techniques were combined to retain the benefits of conformal monolayer formation and the use of an external capping layer...
February 7, 2017: Nanoscale
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"