Simple method to prepare size‐controllable gold nanoparticles in solutions and their applications on surface‐enhanced Raman scattering

Abstract

We report here, for the first time, a simple method to prepare size-controllable Au nanoparticles (NPs) in aqueous solutions from bulk Au substrates. First, chitosan (Ch)-capped Au-containing complexes were prepared by electrochemical oxidation-reduction cycles in 0.1 N NaCl and 1 g/l Ch solutions. Then the solutions were heated from room temperature to boiling at different heating rates to synthesize size-controllable Au NPs. The particle sizes of the prepared Au(111) NPs could be controlled from 5 to 30 nm with an increase of the heating rate during preparation. Experimental results indicate that the prepared Au(111) NPs with diameters ranging from 10 to 30 nm can serve as surface-enhanced Raman scattering active probes for molecules of rhodamine 6G.

Creation of Electron-doping Liquid Water with Reduced Hydrogen Bonds

“…The AuNPs in an aqueous solution was obtained from an Au sheet (purity of 0.9999) by using electrochemical and thermal reduction methods, as shown in our previous report 36 . Typically, the Au electrode was cycled in a deoxygenated aqueous solution of 40 mL containing 0.1 M NaCl and 1 g L −1 Ch from −0.28 to + 1.22 V vs Ag/AgCl at 500 mV s −1 for 200 scans under slight stirring.…”

Innovative Strategy on Hydrogen Evolution Reaction Utilizing Activated Liquid Water

“…Au NPs in an aqueous solution were obtained from an Au sheet (with a purity of 0.9999) using electrochemical and thermal reduction methods 38 . Typically, an Au electrode was cycled in a deoxygenated aqueous solution (40 mL) containing 0.1 N NaCl and 1 g L −1 chitosan (Ch) from −0.28 to 1.22 V vs Ag/AgCl at 500 mV s −1 for 200 scans under light stirring.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part VI

“…It is concluded that the leaching chemicals during long‐term storage can be detected easily by SERS and UV absorption spectroscopy. A simple method for the preparation of size‐controllable gold NPs in solution for SERS applications is described by Yu et al . The experimental results indicate that Au(111) NPs with diameters ranging from 10 to 30 nm can serve as effective SERS‐active probes for R6G.…”