title: A tunable Au core-Ag shell nanoparticle tip for tip-enhanced spectroscopy.
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.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea. jwpark@postech.ac.kr.
authors.forename: Woong
authors.initials: W
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Seoul National University, Seoul 151-742, Korea. zhkim@snu.ac.kr.
authors.forename: Nara
authors.initials: N
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Korea University, Seoul 136-701, Korea.
authors.forename: Eunbyoul
authors.initials: E
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea. jwpark@postech.ac.kr.
authors.forename: Duckhoe
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Seoul National University, Seoul 151-742, Korea. zhkim@snu.ac.kr.
authors.forename: Zee
authors.initials: Z
authors.lastname: Hwan Kim
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea. jwpark@postech.ac.kr.
authors.forename: Joon
authors.initials: J
authors.lastname: Won Park