Dissemin is shutting down on January 1st, 2025

Published in

Royal Society of Chemistry, RSC Advances, 49(5), p. 39103-39109, 2015

DOI: 10.1039/c5ra04214c

Links

Tools

Export citation

Search in Google Scholar

Anisotropic optical properties of large-scale aligned silver nanowire films via controlled coffee ring effects

Journal article published in 2015 by Weiping Zhou, Anming Hu, Shi Bai, Ying Ma ORCID, Ying, Denzel Bridges
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Red circle
Preprint: archiving forbidden
Green circle
Postprint: archiving allowed
Green circle
Published version: archiving allowed
Data provided by SHERPA/RoMEO

Abstract

Thin films with one-dimensional nanostructures and unique physical properties are potential candidates for next-generation high-performance electronic, optoelectronic, and electromechanical systems. Here we report that large-scale oriented silver nanowire films can be prepared by controlling the coffee-ring effect through tilting the substrates during the film deposition. The anisotropic optical properties of orientation silver nanowire film were researched here. Surface enhanced Raman scattering (SERS) spectra were recorded from Rhodamine 6G adsorbed on the silver nanowires films. The SERS spectra showed striking polarization dependence according to the angle between the long axes of nanowires and the light polarization. At the vertical excitation (i.e., light polarization forms a 90° angle to the long axes of the nanowires), the SERS intensity reaches a maximum. Minimum intensities were obtained at a parallel excitation. Three-dimensional finite element method was used to give an in-depth explanation of these properties. The angular resolution fluorescence is also studied. The fluorescence displays an angle-dependence similar to the Raman activities. Optical properties were also investigated through the polarization of reflectivity spectra. The reflectivity is smaller when the incident light was polarized parallel to the oriented direction. As the wavelength increases, the reflectivity increases when the polarization of incident light is perpendicular to the oriented direction. When the wavelength greater than 870 nm, the amplitude can be up to twice. Our study indicates that this technique is promising in the production of large-scale orientation silver nanowire films with anisotropic optical properties for high-performance electronic, optoelectronic, and electromechanical systems.