Abstract
Ag-Nb alloy films with varying Nb content were deposited on flexible polyimide substrates by the magnetron sputtering metho. The results show that dense and monodisperse Ag nano-islands were self-grown on the surfaces of as-deposited Ag-31.1 at% Nb alloy films. FDTD simulations revealed that the local electric field strength is closely related to the covering Ag layer, size and spacing of self-grown nano-islands. A 166-nm Ag-31.1 % Nb alloy film covered with 15-nm Ag layer served as the SERS substrate presented excellent and stable SERS performance and can detect 5 × 10−14 mol/L R6G solution. The preparation method of Ag nano-island/alloy films offers a novel approach for producing reproducible and highly sensitive SERS substrates.
Published Version
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