Imprintable Au-based thin-film metallic glasses with different crystallinities for surface-enhanced Raman scattering
Journal
Journal of Physical Chemistry C
Journal Volume
125
Journal Issue
43
Pages
23983-23990
Date Issued
2021
Author(s)
Abstract
The purpose of the present study was to fabricate a periodic nanostructure on Au-based thin-film metallic glasses (TFMGs) with different crystallinities for surface-enhanced Raman scattering (SERS) applications. To achieve this, fully amorphous Au-Cu-Si TFMGs were fabricated using magnetron co-sputtering, and thermal imprint was adopted to emboss the as-deposited film against a commercial anodic aluminum oxide template in the supercooled liquid region to develop the periodic nanostructure. For different crystallinities, the imprinted Au-Cu-Si TFMGs were heat treated at different temperatures. The morphology, crystallinity, dielectric properties, optical properties, and SERS effects were measured, and finite-difference time-domain simulations were performed to compare with the measured reflectance. It was found that Raman intensity decreased upon the initial crystallization of heat-treated amorphous film due to scattering at grain boundaries. However, the grain growth at higher heat treatment temperatures resulted in the reduction in grain boundary area, and the Raman intensity increased. ? 2021 American Chemical Society
Subjects
Alumina
Aluminum oxide
Amorphous films
Amorphous silicon
Anodic oxidation
Copper compounds
Crystallinity
Finite difference time domain method
Glass
Morphology
Nanostructures
Optical properties
Raman scattering
Substrates
Supercooling
Surface scattering
Thin film solar cells
Thin films
As-deposited films
Cristallinity
Enhanced Raman scattering
Grain-boundaries
Magnetron co-sputtering
Periodic nanostructure
Raman intensities
Surface enhanced Raman
Thermal imprint
Thin film metallic glass
Grain boundaries
SDGs
Type
journal article