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. 2022 Aug 8;126(32):13774–13784. doi: 10.1021/acs.jpcc.2c03524

Figure 1.

Figure 1

(A) Waterfall SERS spectra of planar gold surfaces as a function of the increasing thickness. Three-dimensional (3D) AFM height images of gold-coated silicon substrates with a thickness of (I) 10 nm, (ii) 40 nm, and (iii) 80 nm. (B) Roughness vs gold thickness acquired from the AFM measurements. (C) Waterfall Raman spectra of 0.1 mM thiophenol (TP) over gold substrates with a range of thicknesses. (D) Representative SERS spectra of the 1600 cm–1 peak of thiophenol (TP) as (E) a function of the increasing gold thickness, resulting in a positive linear relationship between the thickness and the acquired SERS signal.