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The stable silver nanotriangle (AgNT) sol was prepared by reduction of silver ions with sodium borohydride in the presence of H2O2 and sodium citrate. Under the action of NaCl, AgNTs were aggregated to a highly surface-enhanced Raman scattering (SERS) active substrate. In pH 6.0 Na2HPO4-NaH2PO4 buffer solution (PBS) at 80 °C water bath, ninhydrin reacted with amino acids to form blue-violet complex...
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