Catalytic processes monitored at the nanoscale with tip-enhanced Raman spectroscopy View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-09

AUTHORS

Evelien M. van Schrojenstein Lantman, Tanja Deckert-Gaudig, Arjan J. G. Mank, Volker Deckert, Bert M. Weckhuysen

ABSTRACT

Heterogeneous catalysts play a pivotal role in the chemical industry, but acquiring molecular insights into functioning catalysts remains a significant challenge. Recent advances in micro-spectroscopic approaches have allowed spatiotemporal information to be obtained on the dynamics of single active sites and the diffusion of single molecules. However, these methods lack nanometre-scale spatial resolution and/or require the use of fluorescent labels. Here, we show that time-resolved tip-enhanced Raman spectroscopy can monitor photocatalytic reactions at the nanoscale. We use a silver-coated atomic force microscope tip to both enhance the Raman signal and to act as the catalyst. The tip is placed in contact with a self-assembled monolayer of p-nitrothiophenol molecules adsorbed on gold nanoplates. A photocatalytic reduction process is induced at the apex of the tip with green laser light, while red laser light is used to monitor the transformation process during the reaction. This dual-wavelength approach can also be used to observe other molecular effects such as monolayer diffusion. More... »

PAGES

583

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nnano.2012.131

DOI

http://dx.doi.org/10.1038/nnano.2012.131

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050300666

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22902959


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