A B S T R A C TThe paradigm modifications in the metallic crystals from bulky to micro-size to nano-scale have resulted in excellent and amazing properties; which have been the remarkable interests in a wider range of applications. Particularly, Ag NPs have much attention owing to their distinctive optical, chemical, electrical and catalytic properties that can be tuned with surface nature, size, shapes, etc. and hence these crystals have been used in various fields such as catalysis, sensor, electronic components, antimicrobial agents in the health industry etc. Among them, Ag NPs based disinfectants have paid attention due to the practical applications in our daily life.

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A modified chemical bath deposition method has been developed to prepare CdSe and HgSe semiconductor thin films in cubic modification, based on the chemical reaction of complexed cadmium acetate, mercuric nitrate with sodium selenosulphate in an aqueous ammoniacal medium at 5 • C. The films were characterized by using x-ray diffraction, optical absorption, electrical measurements and energy dispersive x-ray analysis techniques. The films were uniform, well adherent, dark red and polycrystalline in cubic form without trace of any hexagonality. The CdSe film shows two bandgaps at 2.15 and 1.86 eV, while HgSe shows two bandgaps at 0.8 and 0.45 eV. A thermoelectric study indicated the presence of an n-type conduction mechanism.

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