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. 2021 Dec 30;355:131324. doi: 10.1016/j.snb.2021.131324

Fig. 3.

Fig. 3

Data collections using the Raman mapping technique. (a) Photograph of an Au nanopopcorn substrate and Raman mapping method. Raman mapping images were obtained with an excitation laser wavelength of 632.8 nm, scanned over a 120 µm (x-axis) and 120 µm (y-axis) range using a computer-controlled microscopic stage. (1 pixel=20 µm×20 µm). (b) Raman mapping image measured with the Raman peak intensity at 1075 cm−1 (4-MBA, pink), 1470 cm−1 (Cy3, blue), and 1650 cm−1 (RRX, red). Images on the right are the Raman mapping images for normalized Raman peaks intensity ratios (I1470/I1075, blue and I1650/I1075, red). The scale bars show color decoding bars representing Raman peak intensity distributions.