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Surface plasmon quenched of near band edge emission and enhanced visible photocatalytic activity of Au@ZnO core-shell nanostructure

Paper ID Volume ID Publish Year Pages File Format Full-Text
45968 46427 2014 7 PDF Available
Title
Surface plasmon quenched of near band edge emission and enhanced visible photocatalytic activity of Au@ZnO core-shell nanostructure
Abstract

•Synthesis of Au@ZnO core-shell nanostructure by a simple two-step chemical method.•The ZnO coating enhances the charge separation process, whereas higher shell thickness suppresses the surface plasmon resonance (SPR) and quenches the near band emission of ZnO.•The photocatalytic activity of ZnO and Au@ZnO nanostructure nanostructure with variable shell thickness has been evaluated by the degradation of methyl orange (MO) dye under visible irradiation.

In this research work, we have demonstrated the synthesis of Au@ZnO core–shell nanostructure by a simple two-step chemical method. The ZnO coating enhance the charge separation process, whereas higher shell thickness suppresses the surface plasmon resonance (SPR) absorption of Au core and quenches the near band edge emission of ZnO. The photocatalytic activity of Au@ZnO nanostructure is evaluated by the degradation of methyl orange (MO) dye and oxidation of methanol under visible irradiation. Compared to pure ZnO nanoparticles (NPs), Au@ZnO core-shell NPs exhibit efficient plasmonic photocatalytic activity because of the presence of SPR in the Au core. The photocatalytic activity of the Au@ZnO core-shell NPs is enhanced by the shell thickness. Moreover, a possible mechanism for the photocatalytic activity of Au@ZnO under visible light irradiation is also proposed.

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Keywords
Core-shell; Nanostructure; Visible photo catalyst; Surface plasma resonance; Growth mechanism
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Surface plasmon quenched of near band edge emission and enhanced visible photocatalytic activity of Au@ZnO core-shell nanostructure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 605–611
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us