Synthesis and Characterization of Cadmium-Thioacetamide Nanocomposites Using a Facile Sonochemical Approach: A precursor for Producing CdS Nanoparticles via Thermal Decomposition

Document Type: Research Paper

Authors

1 Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, I. R. Iran

2 Department of Chemistry, Faculty of Sciences, Islamic Azad University, Shahr-e-Rey Branch, Tehran, I. R. Iran

Abstract

In this investigation, we report facile synthesis of cadmium(II)-thioacetamide nanocomposites in the
presence and absence of polyvinyl alcohol under ultrasonic irradiations, using cadmium acetate dihydrate
(Cd(CH3COO)2.2H2O), potassium iodide (KI), thioacetamide (TAA, CH3CSNH2), and polyvinyl alcohol
(PVA) as the starting materials. Results show that in the presence of polyvinyl alcohol sizes of the particles
reduce. Characterization of the compounds was carried out by determination of melting point, scanning
electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared (FT-IR)
spectroscopy, 1H-NMR spectroscopy and thermogravimetric-differential thermal analyses (TG/DTA). The
thermal decomposition of the polymeric nanocomposite, Cd-thioacetamide/PVA in an autoclave under critical
condition led to the formation of spherical cadmium sulfide nanoparticles with an average particle size of
about 20 nm. The X-ray diffraction pattern at room temperature revealed that highly pure and crystallized
CdS with hexagonal structure were obtained. The sonochemical method resulted in a significant reduction of
reaction time, reaction temperature and particle size of the products.

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