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Article – Journal of Nanoscience and Technology

Journal of Nanoscience and Technology, Volume 4,Issue 2,2018 Pages 342-344

Spectral, Thermal and Morphological Characterization of Biodegradable Graphene Oxide-Chitosan Nanocomposites
R. Baby Suneetha*


Graphene oxide (GO) was chemically synthesized from natural graphite by modified Hummers method. The graphene oxide-chitosan (GO-CHI) nanocomposites were synthesized by simple solution-mixing and evaporation method using ultrasonication. The samples were characterized using FTIR, UV-Vis spectroscopy, TG/DTA, DSC, SEM, TEM and AFM. The FTIR spectrum suggested that interactions existed between CHI and GO as evidenced by the downshift of the C=O stretching vibration of the amide group at 1653 cm−1. UV-Vis spectra shows a bathochromic shift in bands of GO in the nanocomposite. The optical analysis of the GO and GO-CHI nanocomposites gave a direct energy band gap of 1.02 eV and 1.08 eV respectively indicating the highly conducting nature of the synthesized nanocomposite. Thermal stability was studied through TG/DTA which showed an enhancement in degradation temperature of chitosan from 175.4 °C to 302.5 °C in the composite and DSC studies showed an endothermic peak at 94.55 °C which is due to the loss of physisorbed water from the surface of the CHI matrix and an exothermic peak at 302.11 °C due to degradation and deacetylation of chitosan indicating high thermal stability of the composite. SEM micrograph of the nanocomposite showed the presence of the biopolymer chitosan with its porous, rough, granular morphology and the GO with its layered morphology. TEM image of the nanocomposite showed the particle size to be 20 nm and it also showed the presence of exfoliated GO as a fibrous network on the surface of the chitosan matrix. AFM study shows the value of the RMS coefficient for the nanocomposite as 40 nm indicating the formation of composite in the nano dimension. It also revealed the presence of rough surface thus indicating the presence of large number of active sites.

Keywords: Graphene Oxide; Chitosan; Nanocomposite;