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Electrostatically Regulated Photoinduced Electron Transfer in “Cationic” Eco-friendly CuInS2/ZnS Quantum Dots in Water

Abstract

The potency of eco-friendly Copper Indium Sulfide/Zinc Sulfide core/shell quantum dots (CIS/ZnS QD) as efficient light harvesters in water is presented. A place exchange protocol is developed to prepare the much demanded cationic ([+]) CIS/ZnS QDs carrying a permanent positive charge, with ~60% retention of the QD photoluminescence (PL) in water. Both steady-state and time-resolved photophysical studies confirm an efficient electron transfer from the photoexcited CIS/ZnS QD to Indocyanine green (ICG) dye. The electrostatic attraction between oppositely charged [+] CIS/ZnS QD and [-] ICG dye is responsible for the formation of a strong ground state complex, which is vital in achieving an efficient electron transfer process in water. The successful demonstration of an efficient light harvesting property using [+] CIS/ZnS QDs will be decisive in the development of artificial photosynthetic systems based on eco-friendly quantum dots.

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Publication details

The article was received on 04 Jun 2018, accepted on 12 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA05269G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Electrostatically Regulated Photoinduced Electron Transfer in “Cationic” Eco-friendly CuInS2/ZnS Quantum Dots in Water

    J. Ann Maria Xavier, G. Devatha, S. Roy, A. Rao and P. P. Pillai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05269G

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