Abstract
Under a controlled adsorption environment, L-cysteine molecules can be chemically adsorbed to the dendritic silver (Ag-D) surface by electrochemical methods with different functional groups. It is verified by surface-enhanced Raman spectroscopy that under alkaline conditions (pH = 13.50), the two functional groups of thiol and acid are simultaneously adsorbed on the surface of Ag-D, while NH2 is far from the surface; under acidic conditions (pH = 1.67), adsorption behavior suggests that both NH3+ and COO− are oriented toward the Ag-D surface, and that SH is far from the surface. The structure of L-cysteine adsorption under acidic conditions can be further verified by the addition of an L-cysteine molecule through light-induced coupling reaction to form cystine. Finally, in-situ two-dimensional Raman scattering spectroscopy confirmed the feasibility and uniformity of the coupling reaction.
Highlights
Under a controlled adsorption environment, L-cysteine molecules can be chemically adsorbed to the dendritic silver (Ag-D) surface by electrochemical methods with different functional groups
The preparation of high-density and large specific surface area Ag-D deposits on the surface of glassy carbon electrode (GCE) and material characterization are described in SI (Supporting Information)
The dendritic Ag surface showed high Raman enhancement, enabling the detection of analytes from dilute solution by surface-enhancement Raman scattering (SERS). 4-Nitrothiophenol was used as the probe molecule to examine the analyte-concentrating ability and SERS activity of Ag-D
Summary
Under a controlled adsorption environment, L-cysteine molecules can be chemically adsorbed to the dendritic silver (Ag-D) surface by electrochemical methods with different functional groups. There are many studies on the surface-enhancement Raman scattering (SERS) spectra and theoretical calculations of the adsorption behavior or structure of L-cysteine on the surface of silver nanostructures[4,19,20,21]. This study will examine in detail the adsorption behavior of this molecule on the surface of dendritic silver (Ag-D) on a SERS-active substrate.
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