Abstract
Nanocrystalline samples of Cadmium Sulphide (CdS) were prepared with different Manganese (Mn) doping concentrations (0-10 at.%) through chemical route using thiophenol as a capping agent. Fourier Tranform Infrared Spectroscopy (FT-IR) study disclosed the presence of capping agent on the surface of the samples. X-ray diffraction (XRD) analysis showed phase transition from hexagonal to cubic phase beyond 8 at.% of Mn doping and grain size in the range of 13-30 nm. Micro structural study by High Resolution Transmission Electron Microscopy (HRTEM) confirmed phase transition and quasi-spherical particles having size in 15-50 nm range with small grains distributed on the surface of the particles. A blue shift in the band gap energy of the samples was indicated in optical absorption study and the band gap was found to vary nonlinearly with Mn content. Studies on electrical properties of the samples using a complex impedance spectroscopy (CIS) technique showed a decrease in the bulk resistance with increase in Mn concentration. Further, the nature of cole-cole plots (Nyquist plots) revealed the presence of bulk and grain boundary effects in the samples in consistent with HRTEM results. These crystalline quasi-spherical nanoparticles of CdS:Mn seems to be one of the promising candidates for modern age opto-electronics and biomedical applications.
Highlights
Diluted magnetic semiconductors (DMS) have been studied widely during the past two decades in view of their intriguing properties [1,2]
Cadmium Sulphide (CdS) doped with different transition metals which could work as multifunctional nanoparticles are being investigated for biomedical applications [6]
It has been reported that doping with transition metals in inorganic quantum particles like CdS could efficiently work as multifunctional nanoparticles [8,9]
Summary
Diluted magnetic semiconductors (DMS) have been studied widely during the past two decades in view of their intriguing properties [1,2]. Consequent upon the advent of nanomaterials, DMS in nano-form have in recent years attracted significant attention of the technologists, because of their relevance to the development of nanotechnology Their specific behavior to external constraints, like temperature, electric field, magnetic field and radiations finds applications in many devices [3]. It has been reported that doping with transition metals in inorganic quantum particles like CdS could efficiently work as multifunctional nanoparticles [8,9]. These functionalized nanoparticles are the futuristic materials for variety of applications starting from data storage, security/sensors to biomedical applications. The dried powder of CdS:Mn was ground in an agate mortar and was characterized
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