Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate.

Autor:	Wan DY; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore., Zhao YL; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore., Cai Y; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA., Asmara TC; Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore., Huang Z; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore., Chen JQ; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore., Hong J; School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore., Yin SM; School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore., Nelson CT; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., Motapothula MR; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore., Yan BX; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore., Xiang D; Department of Chemistry, National University of Singapore, Singapore 117543, Singapore., Chi X; Department of Physics, National University of Singapore, Singapore 117551, Singapore.; Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore., Zheng H; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., Chen W; Department of Physics, National University of Singapore, Singapore 117551, Singapore.; Department of Chemistry, National University of Singapore, Singapore 117543, Singapore., Xu R; School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore., Ariando; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore., Rusydi A; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore.; Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore., Minor AM; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., Breese MBH; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore.; Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore., Sherburne M; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA., Asta M; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA., Xu QH; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Chemistry, National University of Singapore, Singapore 117543, Singapore., Venkatesan T; NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.; Department of Physics, National University of Singapore, Singapore 117551, Singapore.; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, Singapore.; Department of Material Science and Engineering, National University of Singapore, Singapore 117575, Singapore.; Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2017 Apr 19; Vol. 8, pp. 15070. Date of Electronic Publication: 2017 Apr 19.
DOI:	10.1038/ncomms15070
Abstrakt:	Semiconductor compounds are widely used for photocatalytic hydrogen production applications, where photogenerated electron-hole pairs are exploited to induce catalysis. Recently, powders of a metallic oxide (Sr 1-x NbO 3 , 0.033+δ and find that their bandgaps are ∼4.1 eV. Surprisingly, the carrier density of the conducting phase exceeds 10 22  cm -3 and the carrier mobility is only 2.47 cm 2  V -1  s -1 . Contrary to earlier reports, the visible light absorption at 1.8 eV (∼688 nm) is due to the plasmon resonance, arising from the large carrier density. We propose that the hot electron and hole carriers excited via Landau damping (during the plasmon decay) are responsible for the photocatalytic property of this material under visible light irradiation.
Databáze:	MEDLINE
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