Dissemin is shutting down on January 1st, 2025

Links

Tools

Export citation

Search in Google Scholar

UV Tuning of Cadmium Telluride Quantum Dots (CdTe QDs) – Assessed by Spectroscopy and Electrochemistry

This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Question mark in circle
Preprint: policy unknown
Question mark in circle
Postprint: policy unknown
Question mark in circle
Published version: policy unknown

Abstract

In this work, the electrochemical analysis (potentiometric stripping analysis – PSA, cyclic voltammetry – CV) and evaluation of fluorescence properties of cadmium telluride quantum dots (CdTe QDs) covered by mercaptosuccinic acid (MSA) were performed. Using CV it was found that average value of ΔE of QDs is lower than 0.059 V and I is in direct correlation with square root of scan rates, therefore it can be assumed that this system represents rather reversible than quasi-reversible process. Further, it was found that nearly 1.4 electrons are exchanged in both cases, which corresponded with expected two-electron transfer. Fluorescence analysis showed that UV radiation (254 and 312 nm) significantly changes fluorescence properties of CdTe QDs in time 0 – 60 min. It was found that after 5 min of UV irradiation (λ = 312 nm) the fluorescence intensity increased by 37% and at λ = 254 nm the increase in fluorescence intensity was even higher, by 45% (compared to the control without irradiation). UV radiation also caused a shift in the emission maximum of CdTe QDs in range 2 – 70 nm. This work opens up new ways for tuning the optical properties of QDs.