Research Article
Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate
Figure 3
Detection of melamine. (a) Raman spectra of melamine on 60 nm AuNPs@Al foil in 0.078 to 80 ppm concentration range, taken with 785 nm laser excitation. (b) Calibration graph, where 820 cm−1 characteristic vibration peak area is plotted versus in ppb of melamine.
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