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(a) SEM images of the ITO NRs used as SERS-active substrates. The scan size of the image is (top) 50 × 100 μm, (bottom left) 4 × 4 μm, (bottom right) 1 × 1 μm and the inset in the bottom left panel is 500 × 500 nm. (b and c) XRD (b) and FTIR (c) spectra of as-grown ITO NRs.
(a) Raman spectra of unmodified Si and ITO NRs. (b) Raman spectra of 100 μg/ml R6G deposited on Si and ITO NR substrates.
(a) Raman signal from 100 μg/ml DAPI on ITO NR, ITO-coated glass, and Si substrates. (b) Raman spectra collected from various concentrations of DAPI on ITO NR and Si samples. (c) Comparison of concentration-dependent Raman scattering signal from a mixture of DAPI and R6G molecules on ITO NR and Si substrates.
(a) A color photograph and a UV-Vis spectrum of 1.6 nM AuNRs resuspended in deionized water. (b) Raman spectra collected with a 785 nm excitation while keeping the deposition conditions of the 100 μg/ml DAPI and R6G mixture identical on the three substrates of Si, AuNRs, and ITO NRs.
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