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Complex concentration‐dependence of surface‐enhanced Raman scattering (SERS) and UV–Vis absorption of Ag‐nanoparticles (AgNPs) mixed with Gly has been observed. Surprisingly, with decreasing Gly concentration, a new band in UV–Vis absorption of AgNPs/Gly mixtures is found to red‐shift with increasing intensity, until a turning point at a critical concentration. Further diluting Gly, the new band blue‐shifts...
Raman spectra of an aqueous solution of glycine (Gly) have been recorded in the range of 400–2000cm −1 . In aqueous solution, glycine molecules exist in their zwitterionic form, having two opposite charged poles, COO − and NH 3+ . The zwitterionic structure of glycine (ZGly) is stabilized by the hydrogen bond interaction of water (W) molecules. In the present report, we...
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