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(a) Comparison between surface-enhanced Raman spectroscopy and Raman spectrum of Rhodamine 6G at different concentration, integration time = 5 s. (b) UV–Vis absorption spectrum of AuNSt SERS substrates. Dashed line and gray area correspond respectively to the excitation wavelength of 632.8 nm and Raman’s band scattering region. (c) Scanning electron microscopy (SEM) images of AuNSt SERS substrates; Scale bars = 1 µm (left), 200 nm (right).
