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Aqueous electrosynthesis of silver indium selenide nanocrystals and photothermal properties

Abstract

The eco-friendly aqueous electrosynthesis of AgIn5Se8 (AISe) nanocrystals (NCs), and the respective core/shell structure AgIn5Se8/ZnS NCs (AISe/ZnS), was carried out by using L-glutathione (GSH) as stabilizer. Se0 direct reduction was carried out in a graphite powder macroelectrode of an electrochemical cavity cell; controlled by current (i = 30 mA) and electrical charge (Q = 11.6 C). The generated Se2- ions reacts with In3+ and Ag+ ions in the intermediary compartment of the cell to give AISe NCs. A paired electrolysis (Zn0 anode/S0 in graphite powder cathode) was carried out to prepare ZnS-GSH NCs, using the same electrochemical apparatus (i = 30 mA, Q = 9.6 C). The effect of the Ag+/In3+ ratio (0.5, 0.28 and 0.18) and ZnS shell over AISe NCs optical properties was investigated. The ternary AISe NCs were characterized by XRD and HRTEM as a AgIn5Se8 cubic phase structure (Ag+/In3+ = 0.18); the ZnS shell was a zinc blende structure. The shell growth promoted a heterojunction formation with different crystalline phases, leading to a quantum yield decrease (QY: AISe = 18.6 %; AISe/ZnS = 16.0 %). The NCs were irradiated by near-infrared laser at different power densities (λexc = 785 nm). AISe and AISe/ZnS samples showed photothermic response, reaching 381 K and 402 K, respectively.

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Supplementary files

Article information


Submitted
23 Oct 2019
Accepted
06 Jan 2020
First published
08 Jan 2020

Green Chem., 2020, Accepted Manuscript
Article type
Paper

Aqueous electrosynthesis of silver indium selenide nanocrystals and photothermal properties

F. L. N. Sousa, B. A. S. Souza, A. Caires, W. M. de Azevedo, H. S. Mansur, D. de Vasconcelos Freitas and M. Navarro, Green Chem., 2020, Accepted Manuscript , DOI: 10.1039/C9GC03647D

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