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• W2009316348 abstract "• Interfacial charge carrier dynamics of Z-scheme mechanism has been comprehended. • Size effect of Cu 2 O on the charge transfer of Na x H 2− x Ti 3 O 7 -Au-Cu 2 O was realized. • Carrier dynamics results were consistent with the photocatalytic performance. For the first time we presented the interfacial charge carrier dynamics for three-component semiconductor-metal-semiconductor Z-scheme nanoheterostructure system. The samples were prepared by selectively depositing a thin layer of Cu 2 O on the Au surface of Au nanoparticle-decorated Na x H 2− x Ti 3 O 7 nanobelts (denoted as ST-Au NBs) using the photodeposition method. For ST-Au-Cu 2 O NB heterostructures, the embedded Au may act as carrier-transfer mediator to promote the electron transfer from the conduction band of ST to the valence band of Cu 2 O. This vectorial charge transfer would give rise to electron accumulation at Cu 2 O and hole concentration at ST, which achieved superior charge carrier separation over the two-component counterparts of ST-Au and ST-Cu 2 O. The quantum size effect was significant in the deposited Cu 2 O, which was exploited to tune the band structure of Cu 2 O, modulate the charge carrier dynamics of ST-Au-Cu 2 O NBs, and thereby enhance the resultant photocatalytic performance. Time-resolved photoluminescence spectra were measured to quantitatively analyze the electron transfer event between ST and Au for ST-Au-Cu 2 O NBs, which was found dependent on the Cu 2 O shell thickness. As the Cu 2 O thickness decreased, ST-Au-Cu 2 O NBs showed an increased electron-scavenging rate constant due to the increased driving force of electron transfer. The carrier dynamics results were fundamentally consistent with those of the performance evaluation in photocatalysis, in which ST-Au-Cu 2 O NBs exhibited enhanced photocatalytic efficiency as the Cu 2 O thickness decreased. Systematic understanding of the interfacial charge dynamics of Z-scheme mechanism shall pave the way for the realization of artificial photosynthesis by using heterogeneous photocatalysts, where the effectiveness of charge separation and the merit of high redox powers are determinant." @default.
• W2009316348 created "2016-06-24" @default.
• W2009316348 creator A5039863898 @default.
• W2009316348 creator A5068537986 @default.
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• W2009316348 date "2015-02-01" @default.
• W2009316348 modified "2023-10-17" @default.
• W2009316348 title "Modulation of charge carrier dynamics of Na H2−Ti3O7-Au-Cu2O Z-scheme nanoheterostructures through size effect" @default.
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• W2009316348 doi "https://doi.org/10.1016/j.apcatb.2014.08.009" @default.
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