Electrochemical properties and optical response of cadmium selenide quantum dot film electrodes
https://doi.org/10.29235/1561-8331-2021-57-2-144-151
Abstract
Electrochemical charge/discharge mechanisms in the electrophoretically deposited CdSe quantum dot (QD)
film electrodes in NBu4PF6 acetonitrile solution have been investigated. The films were deposited from CdSe colloidal solution in nitrobenzene at variable QD size (diameter) from 3.4 to 6.3 nm onto transparent conducting glass substrates. Electrochemical behavior and optical response were characterized by cyclic voltammetry (CV) and in situ absorption spectroscopy. Electrochemical charging under an inert gas atmosphere results in a reversible color change (electrochromism), due to the bleach of exciton absorption with 0.3 optical density changes. The mechanism of electrochemical charging comprises electron transfer from conducting substrate to QD, interparticle transfer and also electron capturing by acceptors in solution. The introduction of a strong electron acceptor (O2) into the solution results in a suppression of electrochromism. The influence of oxygen is rather reversible which is observed from recovered electrochromic behavior after electrolyte resaturation with argon.
Keywords
Supporting agencies: This work has been performed with a financial support of the Belarusian Republican Foundation for Fundamental Research (Project № Х20-037).
About the Authors
Y. M. Aniskevich
Belarusian State University
Belarus
Belarus
Yauhen M. Aniskevich – Junior Researcher
14, Leningradskaya str., 220030, Minsk
A. V. Radchanka
Research Institute for Physical Chemical Problems of the Belarusian State University
Belarus
Belarus
Aliaksandra V. Radchanka – Junior Researcher
14, Leningradskaya str., 220006, Minsk
M. V. Artemyev
Research Institute for Physical Chemical Problems of the Belarusian State University
Belarus
Belarus
Mikhail V. Artemyev – D. Sc. (Chemistry), Head of the Nanochemistry Laboratory
14, Leningradskaya str., 220006, Minsk
G. A. Ragoisha
Research Institute for Physical Chemical Problems of the Belarusian State University
Belarus
Belarus
Genady A. Ragoisha – Ph. D. (Chemistry), Leading Researcher
14, Leningradskaya str., 220006, Minsk
E. A. Streltsov
Belarusian State University
Belarus
Belarus
Eugene A. Streltsov – D. Sc. (Chemistry), Head of the Electrochemistry Department
14, Leningradskaya str., 220030, Minsk
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