Two-step-route to Ag–Au nanoparticles grafted on Ge wafer for extra-uniform SERS substrates

Abstract

Ag–Au nanoparticles grafted on Ge wafer were fabricated as SERS substrates to detect 200 random spots and the lowest relative standard deviation of less than 7% was obtained.

Fabrication of Colloidal Gold Nanoparticles via Galvanic Replacement in Disproportionation of H2O2 Solution and Their Inverse Photoresponse

“…Another advantage of GRR is that the reaction time can be controlled within several minutes to several hours by controlling the concentration of reactants, selecting appropriate reaction solvents and adding additives . Despite these advantages, metal or alloy particles formed by GRR can only be deposited on the surface of solid semiconductor substrates . GRR has been directly applied to noble metal nanocrystals such as Au, Ag, Pd, and Pt on semiconductor substrates.…”

Ag‐Nanoparticles‐Decorated Ge‐Nanowhisker Grafted on Carbon Fiber Cloth as Flexible and Effective SERS Substrates

“…[31] For example, Ag-NPs were decorated on Ge nanowires or Ge wafers through galvanic displacement to obtain highly sensitive SERS substrates. [32][33] We also constructed Ag-NPs-decorated Ge-nanowhiskers (Ge-NWHKs) grafted on Si-micropillars which present both ultra-high sensitivity and good reproducibility. [34] However, all these SERS substrates are rigid, which are not conducive in some applications, that need flexible and bendable substrates.…”

A Review of Chinese Raman Spectroscopy Research Over the Past Twenty Years

“…The electric field distribution by finite difference time domain (FDTD) simulation proved the high sensitivity and reproducibility of these substrates, achieving a minimum RSD of less than 7% by using R6G (1 × 10 −9 M) as a probe molecule in the aqueous detection and a RSD of less than 8% for crystal violet solution (1 × 10 −8 M). 192 In addition, they developed the bi-functional Au–FeS (Au–Co 3 O 4 ) composites by in situ reduction of Au nanoparticles on the surface of FeS (Co 3 O 4 ). They confirmed that this composite material has an inherent peroxidase-like activity, which could decompose H 2 O 2 into hydroxyl radicals, and then degrades organic contaminants into small molecules.…”