Surface enhanced Raman scattering (SERS) of nanoporous gold (NPG) with various nanopore sizes was investigated at temperatures ranging from 80 to 300 K using rhodamine 6G as probe molecules. It was found that the SERS intensity dramatically increases as temperature and nanopore size decrease. Theoretical analysis indicates that the improved SERS enhancements result from the confluence effects of the electron−phonon scattering, the finite ligament size effect, and the electromagnetic coupling between neighboring gold ligaments, which demonstrate the electromagnetic origin of the SERS effect of NPG.
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Lang et al. (2009) studied this question.
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