tailieunhanh - Báo cáo hóa học: " Thermal decomposition as route for silver nanoparticles"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Thermal decomposition as route for silver nanoparticles | Nanoscale Res Lett 2007 2 44-48 DOI S11671-006-9028-2 NANO EXPRESS Thermal decomposition as route for silver nanoparticles S. Navaladian B. Viswanathan R. P. Viswanath T. K. Varadarajan Published online 28 November 2006 to the authors 2006 Abstract Single crystalline silver nanoparticles have been synthesized by thermal decomposition of silver oxalate in water and in ethylene glycol. Polyvinyl alcohol PVA was employed as a capping agent. The particles were spherical in shape with size below 10 nm. The chemical reduction of silver oxalate by PVA was also observed. Increase of the polymer concentration led to a decrease in the size of Ag particles. Ag nanoparticle was not formed in the absence of PVA. Antibacterial activity of the Ag colloid was studied by disc diffusion method. Keywords Ag nanoparticles Synthesis Silver oxalate Thermal decomposition E. coll Introduction Synthesis of silver nanoparticles is a significant area of research because Ag nanoparticles have potential applications in various fields such as biochemistry environment medicine catalysis electronics and optics 1-4 . Particularly the recent finding revealed that Ag nanoparticles can bind to the HIV 5 . Even though many methods have been reported in the literature the interest in the field of genesis of Ag nanoparticles has not diminished. Among the various methods available thermal decomposition of metal complexes is one of S. Navaladian B. Viswanathan El R. P. Viswanath T. K. Varadarajan National Centre for Catalysis Research Department of Chemistry Indian Institute of Technology Madras Chennai 600 036 India e-mail bvnathan@ the possible ways of producing metal nano structures 6 . If the decomposition temperature of metal complexes is low and the product is metal this reaction can be utilized for the synthesis of nanoparticles. It has been known that silver oxalate Ag2C2O4 decomposes at around 140 C and yields metallic silver and CO2 7 . In this paper the synthesis of Ag .