Issue 44, 2018

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 QDs) 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 efficient electron transfer from the photoexcited CIS/ZnS QDs to indocyanine green (ICG) dye. The electrostatic attraction between the oppositely charged [+] CIS/ZnS QDs and [−] ICG dye is responsible for the formation of a strong ground state complex, which is vital for achieving an efficient electron transfer process in water. The successful demonstration of the efficient light harvesting properties using [+] CIS/ZnS QDs will be decisive in the development of artificial photosynthetic systems based on eco-friendly quantum dots.

Graphical abstract: Electrostatically regulated photoinduced electron transfer in “cationic” eco-friendly CuInS2/ZnS quantum dots in water

Supplementary files

Article information

Article type
Paper
Submitted
04 iyn 2018
Accepted
12 sen 2018
First published
12 sen 2018

J. Mater. Chem. A, 2018,6, 22248-22255

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, 6, 22248 DOI: 10.1039/C8TA05269G

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