Small-Angle Neutron Scattering and Spectroscopic Investigations of Ag Fractal Formation in Chitosan–Ag Nanocomposite Facilitated by Hydrazine Hydrate

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• 作者：S. N. Suraiya Begum ; Vinod K. Aswal ; Radha Perumal Ramasamy
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 4, 2016
• 年：2016
• 卷：120
• 期：4
• 页码：2400-2410
• 全文大小：580K
• ISSN：1932-7455

文摘

In recent years, developments in the solid polymer electrolytes are of current interest for battery technology. Fractals have been observed in solid polymer electrolytes. Formation of fractals may affect conductivity, and therefore understanding the fractal formation in solid polymer electrolytes is essential for battery technology. In this research, we investigated the formation of fractals in chitosan biopolymer containing silver. Small-angle neutron scattering (SANS) analysis showed that incorporation of silver nitrate (AgNO₃) in chitosan solution resulted in an increase in the radius of gyration (R_g) of the chitosan, and rapid reduction using hydrazine hydrate did not reduce the R_g value, indicating an increase in the rigidity of the chitosan membrane. Also, it showed that the rapid reduction of the films affects the fractal dimension. By using Raman measurements, we have observed that the silver templates upon chitosan during the reduction process. Broadband dielectric spectroscopy (BDS) studies showed that the polymer dynamics is modified as a result of reduction of silver upon chitosan. The conductivity is also found to be affected due to the formation of silver nanoparticles (Ag Nps). A model is proposed for the formation of fractals in the chitosan–silver films.