الفهرس 
Introduction and literature surveyOnly 14 pages are availabe for public view
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Abstract
Chitosan-stabilized gold nanoparticles (Cs/Au) film and gold nanoparticles (AuNPs) polymeric film of polyvinyl alcohol (PVA) and chitosan (Cs) were prepared by casting strategy with no need for reducing and/or stabilizing agents. Adding PVA to Cs could overcome many problems; strong adhesion with most of the solid surfaces, the brittleness of Cs so that it becomes easily separable and also PVA enhanced the mechanical and the swelling properties at the same time. The shape, size and crystalline phase were studied using UV-visible (UV-vis) spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). The (TEM) showed that the mean diameter of AuNPs is 14 nm .The nature of the interaction between the Cs and Au nanoparticles was studied using the Fourier transform infrared (FTIR) spectroscopy. Measuring thermal stability, and water content of the prepared films were done by thermogravimetric analysis (TGA). Swelling experiment proved that the samples resist solubility in water so as to be able to use it in water purification. The as-prepared Cs/Au and PVA/Cs/Au nanocomposite films showed high activity in catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of an excess amount of NaBH4. This result is very encourageable and the films remain active after being reused for 3 times. The Cs/Au and PVA/Cs/Au nanocomposite films could be promising candidate for various catalytic reactions.