Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses

Document Type

Journal Article

Publication Title

Journal of Materials Science and Technology

Volume

70

First Page

205

Last Page

213

Publisher

Elsevier

School

School of Engineering

RAS ID

32749

Funders

National Natural Science Foundation of China Department of Education of Guangdong Province Natural Science Foundation of Guangdong Province

Comments

Zhao, Y. Y., Qian, F., Zhao, C., Xie, C., Wang, J., Chang, C., ... Zhang, L. C. (2021). Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu (Ag)-Gd metallic glasses. Journal of Materials Science & Technology, 70, 205-213. https://doi.org/10.1016/j.jmst.2020.08.049

Abstract

© 2020 Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical, chemical, and biological properties. However, facile fabrication of metallic ultrathin freestanding nanoporous films (UF-NPFs) by dealloying is still challenging. Herein, we report a novel strategy of facile preparation of flexible Cu, Cu3Ag, and CuAg UF-NPFs by dealloying thick Mg-Cu(Ag)-Gd metallic glass ribbons. During dealloying, the local reaction latent heat-induced glass transition of the precursor ribbons leads to the formation of a solid/liquid interface between the initially dealloyed nanoporous layer and the underlying supercooled liquid layer. Due to the bulging effect of in situ generated H2 on the solid/liquid interface, Cu, Cu3Ag, and CuAg UF-NPFs with thicknesses of ∼200 nm can self-peel off from the outer surface of the dealloying ribbons. Moreover, it was found that the surface-enhanced Raman scattering (SERS) detection limit of Rhodamine 6G (R6G) on the Cu and CuAg UF-NPF substrates are 10−6 M and 10−11 M, respectively, which are lower than most of the Cu and Cu-Ag substrates prepared by other methods. This work presents a reliable simple strategy to synthesize a variety of cost effective and flexible metallic UF-NPFs for functional applications.

DOI

10.1016/j.jmst.2020.08.049

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