Synthesis and Characterization of CdS and Sr-Doped CdS Quantum Dots: Impedance Analysis for Nano-Tuned Electronic Applications

G N Dar,Department Of Physics, University Of Kashmir, Srinagar-190006 India ,A H Pandith,A Firdous,Department Of Chemistry, University Of Kashmir, Srinagar-190006 India ,Department Of Physics, Sri Pratap College, Srinagar-190001 India ,N Ali,I Nazir,Department Of Physics, University Of Kashmir, Srinagar-190006 India ,Department Of Chemistry, University Of Kashmir, Srinagar-190006 India ,Department Of Physics, University Of Kashmir, Srinagar-190006 India ,M Q Lone,S Irfan,K A Shah,S Showket,Department Of Physics, University Of Kashmir, Srinagar-190006 India ,Department Of Physics, University Of Kashmir, Srinagar-190006 India ,Department Of Physics, Sri Pratap College, Srinagar-190001 India

doi:10.69626/mse.2024.0135

Abstract

This study reports the synthesis and comprehensive characterization of cadmium sulfide (CdS) and strontium-doped CdS quantum dots (QDs) using a straightforward chemical precipitation method. N, N-Dimethylformamide served as the stabilizing agent, while specific metal precursors facilitated the formation of the nanostructures. The incorporation of strontium into the CdS matrix aimed to enhance the electronic properties of the quantum dots. Energy Dispersive X-ray Analysis (EDAX) confirmed the successful doping of Sr into the CdS QDs. X-ray Diffraction (XRD) analysis verified the high-crystallinity of the synthesized quantum dots, with the mean crystal sizes determined to be 3.18 nm for pure CdS and 3.99 nm for Sr-doped CdS (2mM and 4mM concentrations). Impedance spectroscopy was utilized to study the frequency-dependent electrical properties of the QDs at room temperature, revealing significant variations in impedance with frequency. The results demonstrated that both pure and Sr-doped CdS QDs exhibit capacitive admittance, which is indicative of their potential application in nano-tuned electronic devices. The ability to fine-tune the resonant frequency by controlling the size and doping level of the quantum dots presents a significant advantage for their use in advanced electronic applications. The study highlights the promising application of CdS and Sr-doped CdS quantum dots in the development of high-performance, frequency-tunable nanoscale electronic devices.

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