A tunable Au core-Ag shell nanoparticle tip for tip-enhanced spectroscopy
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Updated: Aug 12, 2026

Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
Published on: April 1, 2013
Woong Kim1, Nara Kim2, Eunbyoul Lee3
1Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea. jwpark@postech.ac.kr.
Abstract:
A single Au nanoparticle (NP) with a diameter of 5 nm was transferred to the end of a Si-tip through a picking process, and an Ag shell with a controlled thickness was formed on the Au core. By carrying out tip-enhanced Raman scattering (TERS) measurements on biphenyl-4-thiol (BPT) with the Au@Ag NP-tip (overall diameter of 22-60 nm), we confirm that such tips show a plasmonic local-field enhancement which is sufficient for tip-enhanced spectro-microscopy.
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