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Schematic of the synthetic procedure of CTAC capped GNS-5 where the GNS-5 morphology was achieved by systematic controlling of the concentrations of reagents including gold salt, HCl, ascorbic acid, and AgNO3 (a), and a simple procedure for SERS detection of weak-affinity analytes which involves simple mixing of analytes in a well plate having CTAC capped GNS-5 (b).
