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Title: Multifunctional Fe 2O 3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability

Abstract

In this study, we investigate Au-decorated Fe 2O 3 nanoparticle catalysts, Fe 2O 3–Au, where the supporting Fe 2O 3 nanoparticles are of different shapes: spheres, rings, and tubes. The decoration procedure for the Fe 2O 3–Au nanoparticles is identical for each shape, and is analogous to the synthesis of pure Au nanoparticles (AuNPs). These similarities allows for direct comparison between the different shapes and the pure AuNPs. The morphological, optical, and magnetic characterizations reveal that the Fe 2O 3–Au nanoparticles are hybrid structures exhibiting both plasmonic and magnetic properties. The different shape Fe 2O 3–Au nanoparticles and the AuNPs are evaluated for their ability to catalytically reduce 4-nitrophenol. Remarkably, it is found that Fe 2O 3–Au nanoparticles are more efficient catalysts than AuNPs because they can achieve the same, or better, catalytic reaction rates using significantly smaller quantities of Au, which is the catalytically active material. Taking into account the Au-loadings, the Fe 2O 3 rings and tubes are superior to the Fe 2O 3 spheres as catalytic supports due to their γ-Fe 2O 3 crystal phase. It is also shown that the Fe 2O 3–Au nanoparticles have the additional benefit for catalysis in that they can be recoveredmore » and reused via magnetic collection. Furthermore, the Fe 2O 3–Au nanoparticles and AuNPs are found to efficiently transduce heat from light through plasmonic absorbance, and this phenomenon is exploited to demonstrate the photothermal catalytic reduction of 4-nitrophenol.« less

Authors:
 [1];  [1];  [2]
  1. Savannah River National Lab. (SNL), Aiken, SC (United States). National Security Directorate
  2. Savannah River National Lab. (SNL), Aiken, SC (United States). National Security Directorate; Univ. of Georgia, Athens, GA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1348899
Report Number(s):
SRNL-STI-2016-00325
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
AC09-08SR22470
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 120; Journal Issue: 28; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Larsen, George K., Farr, Will, and Hunyadi Murph, Simona E. Multifunctional Fe2O3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability. United States: N. p., 2016. Web. doi:10.1021/acs.jpcc.6b03733.
Larsen, George K., Farr, Will, & Hunyadi Murph, Simona E. Multifunctional Fe2O3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability. United States. doi:10.1021/acs.jpcc.6b03733.
Larsen, George K., Farr, Will, and Hunyadi Murph, Simona E. Wed . "Multifunctional Fe2O3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability". United States. doi:10.1021/acs.jpcc.6b03733. https://www.osti.gov/servlets/purl/1348899.
@article{osti_1348899,
title = {Multifunctional Fe2O3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability},
author = {Larsen, George K. and Farr, Will and Hunyadi Murph, Simona E.},
abstractNote = {In this study, we investigate Au-decorated Fe2O3 nanoparticle catalysts, Fe2O3–Au, where the supporting Fe2O3 nanoparticles are of different shapes: spheres, rings, and tubes. The decoration procedure for the Fe2O3–Au nanoparticles is identical for each shape, and is analogous to the synthesis of pure Au nanoparticles (AuNPs). These similarities allows for direct comparison between the different shapes and the pure AuNPs. The morphological, optical, and magnetic characterizations reveal that the Fe2O3–Au nanoparticles are hybrid structures exhibiting both plasmonic and magnetic properties. The different shape Fe2O3–Au nanoparticles and the AuNPs are evaluated for their ability to catalytically reduce 4-nitrophenol. Remarkably, it is found that Fe2O3–Au nanoparticles are more efficient catalysts than AuNPs because they can achieve the same, or better, catalytic reaction rates using significantly smaller quantities of Au, which is the catalytically active material. Taking into account the Au-loadings, the Fe2O3 rings and tubes are superior to the Fe2O3 spheres as catalytic supports due to their γ-Fe2O3 crystal phase. It is also shown that the Fe2O3–Au nanoparticles have the additional benefit for catalysis in that they can be recovered and reused via magnetic collection. Furthermore, the Fe2O3–Au nanoparticles and AuNPs are found to efficiently transduce heat from light through plasmonic absorbance, and this phenomenon is exploited to demonstrate the photothermal catalytic reduction of 4-nitrophenol.},
doi = {10.1021/acs.jpcc.6b03733},
journal = {Journal of Physical Chemistry. C},
number = 28,
volume = 120,
place = {United States},
year = {2016},
month = {6}
}

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