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Issue 9, 2018
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Rational fabrication of silver-coated AFM TERS tips with a high enhancement and long lifetime

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Abstract

Tip-enhanced Raman spectroscopy (TERS), known as nanospectroscopy, has received increasing interest as it can provide nanometer spatial resolution and chemical fingerprint information of samples simultaneously. Since Ag tips are well accepted to show a higher TERS enhancement than that of gold tips, there is an urgent quest for Ag TERS tips with a high enhancement, long lifetime, and high reproducibility, especially for atomic force microscopy (AFM)-based TERS. Herein, we developed an electrodeposition method to fabricate Ag-coated AFM TERS tips in a highly controllable and reproducible way. We investigated the influence of the electrodeposition potential and time on the morphology and radius of the tip. The radii of Ag-coated AFM tips can be rationally controlled at a few to hundreds nanometers, which allows us to systematically study the dependence of the TERS enhancement on the tip radius. The Ag-coated AFM tips show the highest TERS enhancement under 632.8 nm laser excitation and a broad localized surface plasmon resonance (LSPR) response when coupled to a Au substrate. The tips exhibit a lifetime of 13 days, which is particularly important for applications that need a long measuring time.

Graphical abstract: Rational fabrication of silver-coated AFM TERS tips with a high enhancement and long lifetime

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Publication details

The article was received on 03 Nov 2017, accepted on 29 Jan 2018 and first published on 29 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR08186C
Citation: Nanoscale, 2018,10, 4398-4405
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    Rational fabrication of silver-coated AFM TERS tips with a high enhancement and long lifetime

    T. Huang, C. Li, L. Yang, J. Zhu, X. Yao, C. Liu, K. Lin, Z. Zeng, S. Wu, X. Wang, F. Yang and B. Ren, Nanoscale, 2018, 10, 4398
    DOI: 10.1039/C7NR08186C

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