Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 25, Issue 1, Pages 133-140Publisher
SPRINGER
DOI: 10.1007/s10008-019-04476-2
Keywords
Cadmium telluride; Quantum dots; Glassy carbon; Electrostatic deposition; Scanning electrochemical microscopy
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Funding
- FONDECYT, Chile [1150775]
- Direccion de Investigacion e Innovacion of the Pontificia Universidad Catolica de Valparaiso [37.0/2018 DI-PUCV, 125.797/2015 DII-PUCV]
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Cadmium telluride quantum dots (CdTe-QDs) were successfully immobilized on glassy carbon electrodes via electrostatic deposition, with the surface coverage depending on deposition potential and time. The amount of QD layers was determined by tracking the redox process of cadmium through cyclic voltammetry and chronoamperometry, while their characteristics were characterized by scanning electrochemical microscopy (SECM) showing a decrease in the surface conductivity of the GC electrodes.
Cadmium telluride quantum dots (CdTe-QDs) can be deposited from colloidal solutions on glassy carbon (GC) electrodes potentiostatically. The immobilization of QDs can be performed at potentials positive and negative from the potential of zero charge (PZC = 0.45 V vs. Ag/AgCl), including the open circuit potential. The surface coverage of QDs depends on the deposition potential and time. The amount of QD layers was determined by following the redox process of cadmium by cyclic voltammetry and chronoamperometry. Additionally, the QD layers were characterized by scanning electrochemical microscopy (SECM) indicating a decrease of the surface conductivity of GC electrodes.
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