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Thioglycolic Acid (TGA) stabilized aqueous Zinc Selenide (ZnSe) Quantum Dots (QDs) were synthesized using a facile, Single Injection Hydrothermal (SIH) method in complete ambient environment. The synthesis technique eliminates the use of inert atmosphere for reducing elemental Selenium power to Selenium precursor avoiding the oxidation. The synthesized ZnSe QDs were characterized for its structural and optical properties. The short chained TGA capping on the surface of ZnSe QDs was confirmed using FTIR spectrum. The XRD confirmed the formation of ZnSe QDs. The ZnSe QDs, absorption spectra shifted to higher energy (blue shifted) with respect to the bulk ZnSe absorption peak, due to strong quantum confinement effect. The absorption peak wavelength red shifted with increasing reflux time from 0th minute to 500th minutes, this indicates the QDs have grown in size with increasing reaction time. However, the largest sized QDs were still below Bohr’s excitons radius of the material; the bandgap calculated using Tauc’s plot showed blue shift with respect to bulk ZnSe bandgap energy, hence confirming strong quantum confinement effect. These synthesized QDs can be used for wide range of energy harvesting applications.

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A Facile Synthesis of TGA Stabilized ZnSe Quantum Dots for Energy Harvesting Applications

  • 会议论文

  • 发表日期：

    2025年

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  • Udoshi Basavaraj,
  • B. Jai Kumar,
  • H. M. Mahesh

摘要

Thioglycolic Acid (TGA) stabilized aqueous Zinc Selenide (ZnSe) Quantum Dots (QDs) were synthesized using a facile, Single Injection Hydrothermal (SIH) method in complete ambient environment. The synthesis technique eliminates the use of inert atmosphere for reducing elemental Selenium power to Selenium precursor avoiding the oxidation. The synthesized ZnSe QDs were characterized for its structural and optical properties. The short chained TGA capping on the surface of ZnSe QDs was confirmed using FTIR spectrum. The XRD confirmed the formation of ZnSe QDs. The ZnSe QDs, absorption spectra shifted to higher energy (blue shifted) with respect to the bulk ZnSe absorption peak, due to strong quantum confinement effect. The absorption peak wavelength red shifted with increasing reflux time from 0th minute to 500th minutes, this indicates the QDs have grown in size with increasing reaction time. However, the largest sized QDs were still below Bohr’s excitons radius of the material; the bandgap calculated using Tauc’s plot showed blue shift with respect to bulk ZnSe bandgap energy, hence confirming strong quantum confinement effect. These synthesized QDs can be used for wide range of energy harvesting applications.