Highly Raman-Enhancing Substrates Based on Silver Nanoparticle Arrays with Tunable Sub-10nm Gaps


  • We thank Dr. Y. F. Shieh of Ma-tek, Taiwan, for the TEM studies and Hsuan-Hao Chang for image processing. This work was supported by the National Science Council (Grant No. NSC 94-2120-M-001-002) and Academia Sinica, Taiwan.


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Uniform and highly surface-enhanced Raman spectroscopic (SERS)-active substrates have been fabricated using Ag nanoparticle arrays with unprecedented small tunable gaps. The dependence of the enhancing capability of the substrate on the gap size provides quantitative evidence for the collective SERS effect and confirms predictions of interparticle-coupling-induced Raman enhancement.