Surface Enhanced Raman etched metal surfaces

The reaction between A-chlorobenzotriazole and l-methyl-2-phenylindole involves formation of the indole radical cation and benzotriazole radical via an initial electron transfer <82JOC4895, 91JCS(P2)1779>. Chemical reactions of benzotriazole on a freshly etched surface of metallic copper are studied by surface-enhanced Raman scattering, x-ray photoelectron spectroscopy, and cyclic voltammetry. The surface product is (benzotriazolato)copper(-l-), which covers the surface in the shape of polymeric material and shows good anticorrosion effects for copper <91JPC7380>. 

Kim Y, Tsao A, Lee DH, Maboudian R (2012) Solvent-induced formation of unidirectionally curved and tilted Si nanowires during metal-assisted chemical etching. J Mater Chem C 1 220-224 Kiraly B, Yang S, Huang TJ (2013) Multifunctional porous silicon nanopillar arrays antireflection, superhydrophobicity, photoluminescence, and surface-enhanced Raman scattering. Nanotechnology 24 245704... 

Mono-molecular surface layers exhibit strong effects in small colloidal particles. In the visible region even sub-monomolecular ad-layer of sulfides, iodides, oxides or borates lead to a significant modification of the plasmon resonance [9] (Figure 9). Ordered arrays of metal-columns deposited on, imprinted in or etched out of a substrate surface allow the excitation of extended plasmons similar to colloid arrays. Sharp tip structures allow high local fields and thus enable efficient energy transfer applied e.g. in surface enhanced Raman scattering (SERS). 

---