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

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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.

Significance of the study:

This study demonstrates the synthesis and characterization of CdS and Sr-doped CdS quantum dots, showcasing their potential for advanced electronic applications. By fine-tuning the resonant frequency through size and doping control, these quantum dots present significant advantages for developing high-performance, frequency-tunable nanoscale devices, thereby contributing to advancements in nanotechnology and materials science.

Summary of the study:

Pure and Sr-doped CdS quantum dots were synthesized via chemical precipitation and characterized using several techniques. The doping process was validated, and the nanomaterials exhibited hexagonal wurtzite structures with sizes within the quantum confinement regime. Impedance spectroscopy revealed frequency-dependent electrical properties, highlighting their capacitive nature and potential for use in nano-tuned electronic devices, such as tunable capacitors and high-frequency oscillators.