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Hot-Electron Transfer from Semiconductor Domain to Metal Domain in CdSe@CdS{Au} Nano-Heterostructure

Abstract

Semiconductor-metal hybrid nanostructures recognized to be great materials due to light-induced high charge separation, which has direct relevance in photo-catalysis and solar energy conversion. To understand the inner mechanism of higher charge separation processes within the hybrid materials CdSe@CdS{Au} nano hetero-structures with different size Au nanoparticles (NP) are synthesized and ultrafast charge transfer dynamics have been monitored with the help of Femto-second transient spectroscopy. Steady state optical absorption studies suggest formation of charge transfer (CT) complex between core-shell QDs and Au nanoparticles (NPs). Steady state and time-resolved luminescence spectroscopy suggest electron transfer from photo-excited CdSe@CdS core-shell to Au NP within the heterostructure. Ultrafast interfacial electron transfer dynamics in the hetero-structure was monitored by femtosecond transient absorption spectroscopy. Transient absorption studies revealed both hot and thermalized electron transfer take place from core-shell QDs to metal NPs with time constants of 150 fs and 300 fs, respectively. Hot electron transfer from QDs to Au NP found to take place predominantly in the hetero-structures depending on the sizes of the metal nanoparticles. Photo-degradation of rhodamin B (Rh-B) in presence of CdSe@CdS{Au} HS under visible radiation suggests that hot electron in the hetero-structure play a major role in photo-catalytic degradation.

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Publication details

The article was received on 29 Mar 2017, accepted on 06 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR02232H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Hot-Electron Transfer from Semiconductor Domain to Metal Domain in CdSe@CdS{Au} Nano-Heterostructure

    H. N. Ghosh, J. Dana and P. Maity, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02232H

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