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Nanoscale Research Letters

, 7:569

International Conference on Superlattices, Nanostructures, and Nanodevices ICSNN 2012

Abstract

In this study, Ni and Cu nanowire arrays and Ni-Cu superlattice nanowire arrays are fabricated using standard techniques such as electrochemical deposition of metals into porous anodic alumina oxide templates having pore diameters of about 50 nm. We perform optical measurements on these nanowire array structures. Optical reflectance OR of the as-prepared samples is recorded using an imaging spectrometer in the wavelength range from 400 to 2,000 nm i.e., from visible to near-infrared bandwidth. The measurements are carried out at temperatures set to be 4.2, 70, 150, and 200 K and at room temperature. We find that the intensity of the OR spectrum for nanowire arrays depends strongly on the temperature. The strongest OR can be observed at about T = 200 K for all samples in visible regime. The OR spectra for these samples show different features in the visible and near-infrared bandwidths. We discuss the physical mechanisms responsible for these interesting experimental findings. This study is relevant to the application of metal nanowire arrays as optical and optoelectronic devices.

KeywordsNanowire array Optical properties Visible and near-infrared Temperature dependence Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-7-569 contains supplementary material, which is available to authorized users.

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Autor: Yaya Zhang - Wen Xu - Shaohui Xu - Guangtao Fei - Yiming Xiao - Jiaguang Hu

Fuente: https://link.springer.com/



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