TAILIEUCHUNG - Synthesis and characterization of copper nanoparticle - chitosan
The resulting copper nanoparticles were characterized by transmission electron microscopy (TEM) and UVvisible (UV-VIS) spectroscopy. It was found that an absorbance band at 805 nm was observed in UV-VIS spectra and the copper nanoparticles were found to be spherical with a narrow size distribution, the average diameter was about 3 nm. | Journal of Chemistry, Vol. 45 (5), P. 638 - 641, 2007 synthesis and characterization of copper nanoparticle - chitosan Received 10 October 2006 Do Truong thien, Nguyen Van tuyen, Tran Thi Y nhi Institute of Chemistry, Vietnamese Academy of Science and Technology Summary Copper nanoparticles were synthesized in the presence of chitosan via reduction of Cu(NO3)2 with sodium borohydride with the ratio of 4 ml mg/ml chitosan : 2ml Cu(NO3)210 mM : 1 ml NaBH4 M in aqueous solution. Chitosan molecules absorbing on the surface of prepared copper nanoparticles formed the corresponding copper nanoparticle-chitosan. The resulting copper nanoparticles were characterized by transmission electron microscopy (TEM) and UVvisible (UV-VIS) spectroscopy. It was found that an absorbance band at 805 nm was observed in UV-VIS spectra and the copper nanoparticles were found to be spherical with a narrow size distribution, the average diameter was about 3 nm. I - Introduction Many people already consider nanotechnology as the key technology of the 21st century. In some consumer products, nano-sized particles are used because of their physical and chemical properties. Recently, much work has been done on metal nanoparticles as potentially useful materials showing novel electronic, optical, magnetic properties, especially as improving the quality of catalyst [1, 2]. To stabilize the dispersion of nanoparticles, it is necessary to use protective agents, such as polymers, surfactants and chelating agents [1]. Some functional groups such as cyano (-CN), mercapto (-SH), and amino (-NH2) groups are known to have high affinity for copper. Protective polymers having such functional groups are expected to produce small copper nanoparticles with a quite narrow size distribution [1, 3, 4]. Chitosan is a transformed polysaccharide obtained by deacetylation of natural polymer, which is one of the most important natural polymers constituting of the sells of crustaceans 638 and the cell war of
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