| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 100 === ABSTRACT
The main objective of the present investigation deals with the synthesis and characterization of silver-chitosan nanocomposites. Silver-chitosan nanocomposites were prepared by the reducing of silver ions in the presence of chitosan. The optical and morphological properties of the synthesized nanocomposites were studied using polarized optical microscopy (POM), UV-vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The morphological properties studied by POM reveals that silver-chitosan nanocomposites exhibited the spindle like self-assembled structure which is entirely different from the pure chitosan alone. These morphological properties were further confirmedusing SEM and AFM analysis. All the results show the similar morphology, and the size of the nanoparticles increases with increasing of silver salt concentration (AgNO3). This indicates that formation of nanocomposites and controlling of particle size mainly depend on the concentration of Ag used. Transmission electron microscopy (TEM) images and UV–vis spectra of the nanocomposites support the presence of silver nanoparticles. From the above optical and morphological studies, it was found that the formation of silver cluster plays an important role assiginificant interaction with chitosan composites forming some specific self-assembled constructions. Balance of internal and external forces of matrices shows the final construction. Such kind of combinations of silver with chitosan in composites system is expected to be applied in non-linear optics and biomedical applications.
Keywords: chitosan, nanoparticles, nanocomposites, nanostructural, optical
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