Open Access

ARTICLE

Nanostructured Self-Organization of Lead Sulphide Quantum Dots by Electrophoretic Deposition (EPD) Technique

R. Yoga Indra Eniya¹, K. Vijayakumar², B. Vigneashwari^3,*

PG & Research Department of Physics, Government Arts College for Men, Krishnagiri, 635001, Tamil Nadu, India

* Corresponding Author: B. Vigneashwari. Email:

Chalcogenide Letters 2025, 22(11), 971-985. https://doi.org/10.15251/CL.2025.2211.971

Received 11 November 2025; Accepted 24 November 2025;

Abstract

Nanocrystals (~16 nm) of semiconducting lead sulphide (PbS) were synthesized using the coprecipitation method, which was characterized for phase and compositional purity. These ultrafine particles of PbS exhibited quantum confinement characteristics, which were revealed by blue-shifting in optical absorption using UV-DRS analysis. These QDs of PbS were driven under the influence of the applied electric field using monodispersed colloidal suspension on the Indium-Tin-Oxide (ITO) substrate using the electrophoretic deposition technique (EPD). The formation of self-organized arrays of PbS quantum dots (QDs) and their stacked assemblies was achieved through EPD. Interestingly, neither complexing agents nor templates were used for depositing PbS QDs. Also, the as-deposited film was not subjected to any post-heat treatment. EPD of PbS QDs emerges asa highly portable, cost-effective, short-duration, and pollution-free technique compared to all other known deposition methods. The crystallinity, size, morphology, and composition of PbS powder and film were characterized using PXRD, GIXRD, FESEM, SEM, and EDAX. The effect of controlling parameters such as distance between the electrodes, duration of deposition, and applied voltage was fixed as constant, and the obtained results were reported.

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Keywords

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