Nanostructured silver dendrites for photon-induced Cysteine dimerization

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.

Charge Transfer Surface-Enhanced Raman and Absorption Spectra of the Zwitterionic Form of Cysteine Adsorbed on M@Au12 (M = Au, Ag, Pt, and Pd) Nanoclusters

“…The enhancement of the signal intensity in SERS is dependent on factors such as molecule distance, orientation, and affinity toward the metal surface. The SERS spectrum of the LC interacting with various metal surfaces has been studied both theoretically as well as experimentally. − Graff et al investigated the adsorption of the l - and d -cysteine enantiomers on an Ag electrode surface using the SERS technique as a function of electrode potential and solvent pH . A complete experimental study has been performed by Guicheteau et al on the IR, Raman, and SERS spectra of a series of amino acids (phenylalanine, tyrosine, tryptophan, glutamine, cysteine, alanine, proline, methionine, asparagine, threonine, valine, glycine, serine, leucine, isoleucine, aspartic acid, and glutamic acid) and the nucleic acid bases (adenosine, guanosine, thymidine, and uridine) .…”

“…The SERS and DFT calculations were used to investigate the adsorption of LC on the nanoparticle surfaces . Chang et al investigated the adsorption geometry of the LC on the dendric Ag surface using electrochemical methods in different pH environments …”

“…43 Chang et al investigated the adsorption geometry of the LC on the dendric Ag surface using electrochemical methods in different pH environments. 44 In our previous work, we investigated the effect of replacing the Au core atom of an Au 13 nanocluster with an Ag, Pd, and Pt atom (Ag@Au 12 , Pd@Au 12 , and Pt@Au 12 ) on its interaction with different forms of the LC (neutral, anionic, cationic, and zwitterion (ZW)). 33 The Ag@Au 12 , Pd@Au 12 , and Pt@Au 12 nanoclusters were chosen as models to investigate the effect of an Au nanoparticles core type on its interaction with the LC.…”

Facile Microwave Assisted Synthesis of Silver Nanostars for Ultrasensitive Detection of Biological Analytes by SERS

“…The supporting information can be downloaded at: . References [ 11 , 16 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ] are cited in the supplementary materials.…”