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Etching and Dimerization: A Simple and Versatile Route to Dimers of Silver Nanospheres with a Range of Sizes

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  • This research was supported in part by a research grant from the NSF (DMR-0804088) and a 2006 Director’s Pioneer Award from the NIH (DP1 OD000798). P.H.C.C. was also supported in part by the Fulbright Program and the Brazilian Ministry of Education (CAPES). Part of the study was performed at the Nano Research Facility (NRF), a member of the National Nanotechnology Infrastructure Network (NNIN), which is supported by the NSF under ECS-0335765. NRF is part of the School of Engineering and Applied Science at Washington University in St. Louis.

Abstract

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Two by two, hurrah! Hurrah! Dimers of Ag nanospheres with a range of sizes were generated by etching Ag nanocubes with Fe(NO3)3 in ethanol in the presence of poly(vinyl pyrrolidone) (PVP). These well-defined dimers (see TEM image) enable systematic study of the hot-spot phenomenon in surface-enhanced Raman scattering (SERS).

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