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. 2023 Jan 24;95(5):2690–2697. doi: 10.1021/acs.analchem.2c03210

Figure 2.

Figure 2

UV–vis spectra of the surfactant-free GNSs (GNS-1, GNS-2, and GNS-3) showing that a red shift from 705 to 850 nm occurs when the GNS morphology changes from GNS-1 to GNS-3 (dotted line) and PVP-coated GNSs which shows that there occurs a 15–20 nm red-shift after PVP coating of the corresponding GNS.