Optical waveguide in curved and welded perovskite nanowires
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In order to understand properties of ultrathin copper nanowires, we have simulated several copper nanowires using classical molecular dynamic simulations. As the temperature increases, copper nanowires were transformed into structures of the lowest surface stresses and surface energy, circular cross-section with {111}-like surface. As thickness of copper nanowire increases, the breaking of nanowire and the structural transition hardly occurrs. From studies of angular correlation and radial distribution functions, it was shown that ultrathin {111} nanowires was more stable than that of {100} nanowires. The vibrational frequency of nanowires was different to that of bulk about 3 THz and above 8 THz. The structural properties of cylindrical multi-shell nanowires were greatly different from that of face centered cubic.
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Controlling one-dimension nanowire growth at single nanowire level is vital for building up multifunctional nanowire-based devices and getting insights into nanowire growth mechanisms. In this letter, we report the first control of single nanowire growth in a nanowire forest by touching a growing tungsten oxide nanowire with a nanoprobe inside an environmental scanning electron microscope. Compared with naturally growing nanowires, the touched nanowire exhibits an accelerated radial growth rate and decelerated axial growth rate, with the ratio of axial growth rate to radial growth rate decreasing by a magnitude of up to two orders. It is flexible to alternately accelerate and decelerate the growth rate of single nanowires via nanoprobe touching and detaching. The acceleration of the radial growth rate is attributed to the touching-induced local cooling of the touched nanowires and the consequent dominant vapor source deposition on the sidewall due to the reduced effective diffusion length of adatoms and the reduced equilibrium source vapor pressure. Our results represent the first controllable nanowire growth at single nanowire level and provide insights into the diffusion kinetics of nanowire growth. The as-grown nanowires exhibit potential applications in near-infrared photodetectors.
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光的吸收的理解是必要的为有效光电并且有 IIIV nanowire 数组的 photodetection 应用。这里，我们相关有当模特儿的实验并且试验性地为改变 nanowire 直径和长度在 InP nanowire 数组验证光的预言的吸收。我们发现那在 400 nm 的程度中的长 nanowires 能吸收的 2,000 nm 有在乐队上面的精力的 94% 事件光豁开并且作为后果，点亮在简单光线光学，描述哪个将在 nanowires 之间旅行能被 nanowires 高效地吸收。当光从进数组最高区域的空气被联合时，我们的大小证明为长 nanowires 的吸收由插入思考损失是有限的。这些思考损失能被最近把一条更小的直径介绍给 nanowire 部分到空气减少最高区域。为有如此的 nanowire 形态学调整的 nanowire 数组，我们发现吸收比与增加 nanowire 的其余部分的直径单调地增加。
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Placing nanowires at the predetermined locations on a substrate represents one of the significant hurdles to be tackled for realization of heterogeneous nanowire systems. Here, we demonstrate spatially-controlled assembly of a single nanowire at the photolithographically recessed region at the electrode gap with high integration yield (~90%). Two popular routes, such as protruding electrode tips and recessed wells, for spatially-controlled nanowire alignment, are compared to investigate long-range dielectrophoretic nanowire attraction and short-range nanowire-nanowire electrostatic interaction for determining the final alignment of attracted nanowires. Furthermore, the post-assembly process has been developed and tested to make a robust electrical contact to the assembled nanowires, which removes any misaligned ones and connects the nanowires to the underlying electrodes of circuit.
Electrostatics
Realization (probability)
Dielectrophoresis
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In order to understand properties of ultrathin copper nanowires, we have simulated several copper nanowires using classical molecular dynamic simulations. As the temperature increases, copper nanowires were transformed into structures of the lowest surface stresses and surface energy, circular cross-section with {111}-like surface. As thickness of copper nanowire increases, the breaking of nanowire and the structural transition hardly occurrs. From studies of angular correlation and radial distribution functions, it was shown that ultrathin {111} nanowires was more stable than that of {100} nanowires. The vibrational frequency of nanowires was different to that of bulk about 3 THz and above 8 THz. The structural properties of cylindrical multi-shell nanowires were greatly different from that of face centered cubic.
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Area density
Vapor–liquid–solid method
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Nanomaterials
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We model the growth of ZnO nanowires via vapor phase transport and examine the relationship predicted between nanowire length and radius. The model predicts that the lengths of the nanowires increase with decreasing nanowire radii. This prediction is in very good agreement with experimental data from a variety of nanowire samples, including samples showing a broad range of nanowire radii and samples grown using a lithographic technique to constrain the nanowire radius. The close agreement of the model and the experimental data strongly supports the inclusion of a surface diffusion term in the model for the incorporation of species into a growing nanowire.
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The influence of shadow effect originating from the neighboring nanowires on the nanowire growth is theoretically investigated. The nanowire axial and radial growth rates and the nanowire shape are shown to be strongly dependent on the nanowire surface density and the direction of incident flux. Theoretical predictions are compared with the experimental shapes of InAs nanowires grown by the Au-catalyzed molecular beam epitaxy. In particular, the barrel-like shape observed in dense arrays of InAs nanowires is well described by the model. Very importantly, we show that the shadow effect helps to avoid otherwise enabled radial growth and to preserve the cylindrical nanowire shape.
Vapor–liquid–solid method
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