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Title: Tip-Enhanced Raman Imaging of Photocatalytic Reactions on Thermally-Reshaped Gold and Gold-Palladium Microplates

Abstract

Bimetallic nanostructures support a large spectrum of chemical reactions. When comprised of a mixture of nobel and catalytic metals, bimetallic structures can drive light-driven chemical transformations. The yields and selectivities of reactions performed using these catalysts directly depend on their makeup, which often varies on the nanometer scale. Herein, we use tip-enhanced Raman spectroscopy (TERS) to investigate the plasmonic and photocatalytic properties of walled gold-palladium microplates (WAu@PdMPs) and their monometallic counterparts with nanometer spatial resolution, chemical selectivity, and high sensitivity. We find that 4-nitrobenzenethiol (4-NBT) can be transformed into both to p,p'-dimercaptoazobisbenzene (DMAB) and 4-aminothiophenol (4-ATP) on WAu@PdMPs. In contrast, monometallic AuMPs and WAuMPs exclusively yield DMAB, formed as a result of photocatalytic reduction of 4-NBT. Using 4-NBT as a molecular reporter, we find that the efficiencies of these catalytic reactions strongly depend on the nano-structural makeup of the microplates.

Authors:
 [1]; ORCiD logo [2];  [1]
  1. Texas A & M University
  2. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1765542
Report Number(s):
PNNL-SA-153878
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemical Communications
Additional Journal Information:
Journal Volume: 57; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Li, Zhandong, El-Khoury, Patrick Z., and Kurouski, Dmitry. Tip-Enhanced Raman Imaging of Photocatalytic Reactions on Thermally-Reshaped Gold and Gold-Palladium Microplates. United States: N. p., 2021. Web. doi:10.1039/D0CC07060B.
Li, Zhandong, El-Khoury, Patrick Z., & Kurouski, Dmitry. Tip-Enhanced Raman Imaging of Photocatalytic Reactions on Thermally-Reshaped Gold and Gold-Palladium Microplates. United States. https://doi.org/10.1039/D0CC07060B
Li, Zhandong, El-Khoury, Patrick Z., and Kurouski, Dmitry. 2021. "Tip-Enhanced Raman Imaging of Photocatalytic Reactions on Thermally-Reshaped Gold and Gold-Palladium Microplates". United States. https://doi.org/10.1039/D0CC07060B.
@article{osti_1765542,
title = {Tip-Enhanced Raman Imaging of Photocatalytic Reactions on Thermally-Reshaped Gold and Gold-Palladium Microplates},
author = {Li, Zhandong and El-Khoury, Patrick Z. and Kurouski, Dmitry},
abstractNote = {Bimetallic nanostructures support a large spectrum of chemical reactions. When comprised of a mixture of nobel and catalytic metals, bimetallic structures can drive light-driven chemical transformations. The yields and selectivities of reactions performed using these catalysts directly depend on their makeup, which often varies on the nanometer scale. Herein, we use tip-enhanced Raman spectroscopy (TERS) to investigate the plasmonic and photocatalytic properties of walled gold-palladium microplates (WAu@PdMPs) and their monometallic counterparts with nanometer spatial resolution, chemical selectivity, and high sensitivity. We find that 4-nitrobenzenethiol (4-NBT) can be transformed into both to p,p'-dimercaptoazobisbenzene (DMAB) and 4-aminothiophenol (4-ATP) on WAu@PdMPs. In contrast, monometallic AuMPs and WAuMPs exclusively yield DMAB, formed as a result of photocatalytic reduction of 4-NBT. Using 4-NBT as a molecular reporter, we find that the efficiencies of these catalytic reactions strongly depend on the nano-structural makeup of the microplates.},
doi = {10.1039/D0CC07060B},
url = {https://www.osti.gov/biblio/1765542}, journal = {Chemical Communications},
number = 7,
volume = 57,
place = {United States},
year = {2021},
month = {1}
}

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