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In Situ Nanoscale Investigation of Catalytic Reactions in the Liquid Phase Using Zirconia-Protected Tip-Enhanced Raman Spectroscopy Probes

Kumar, N; Wondergem, C S; Wain, A J; Weckhuysen, B M (2019) In Situ Nanoscale Investigation of Catalytic Reactions in the Liquid Phase Using Zirconia-Protected Tip-Enhanced Raman Spectroscopy Probes. The Journal of Physical Chemistry Letters, 10 (8). pp. 1669-1675. ISSN 1948-7185

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Abstract

Tip-enhanced Raman spectroscopy (TERS) is a promising technique that can provide non-destructive and label-free topographical and chemical imaging at the nanoscale. However, its scope for in situ characterization of catalytic reactions in the liquid phase has remained limited due to the lack of robust and durable plasmonically active TERS probes. Herein, we present novel zirconia protected TERS probes with three orders of magnitude increase in lifetime under ambient conditions together with a significant improvement of their stability inside a liquid environment. Furthermore, using these probes, we demonstrate spatially resolved characterization of a photocatalytic reaction within aqueous environment employing plasmon-catalyzed oxidation of p-aminothiophenol as a model reaction. The reaction products are mapped in situ with a spatial resolution of < 15 nm. The reported improved lifetime, stability and the high resolution in a liquid environment extend the scope of TERS as a nanoanalytical tool not only to heterogeneous catalysis, but also to a range of scientific disciplines from biology to electrochemistry where solid-liquid interfaces play a defining role.

Item Type: Article
Keywords: Tip-enhanced Raman spectroscopy, zirconia coating, nanoscale chemical imaging, heterogeneous catalysis
Subjects: Nanoscience > Surface and Nanoanalysis
Divisions: Chemical, Medical & Environmental Science
Identification number/DOI: 10.1021/acs.jpclett.8b02496
Last Modified: 20 Jun 2019 13:36
URI: http://eprintspublications.npl.co.uk/id/eprint/8421

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