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Title: Multifunctional Fe2O3–Au Nanoparticles with Different Shapes: Enhanced Catalysis, Photothermal Effects, and Magnetic Recyclability

Journal Article · · Journal of Physical Chemistry. C
 [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

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.

Research Organization:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC09-08SR22470
OSTI ID:
1348899
Report Number(s):
SRNL-STI-2016-00325
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 28; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 69 works
Citation information provided by
Web of Science

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Engineering Gold Nanorod-Copper Sulfide Heterostructures with Enhanced Photothermal Conversion Efficiency and Photostability journal February 2018
A Highly Sensitive and Stable Dopamine Sensor Using Shuttle-Like α-Fe 2 O 3  Nanoparticles/Electro-Reduced Graphene Oxide Composites journal January 2019
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MOF-derived porous Fe 2 O 3 with controllable shapes and improved catalytic activities in H 2 S selective oxidation journal January 2018
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Figures / Tables (12)