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All Journal Chemistry Indonesian Journal of Chemical Research
Nessa Gina Sonia
Postgraduate School, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Jl. Bioteknologi No. 1, Medan, 20155, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science

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Morphological Study and Characterization of Chitosan/Graphene Quantum Dots/TiO2 Composite Film as a Modified Electrode Material Astri Anjelina Nasution; Irwana Nainggolan; Andriayani Andriayani; Nessa Gina Sonia
Indonesian Journal of Chemical Research Vol 14 No 1 (2026): Edition for May 2026
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2026.14-ast

Abstract

This study investigates the morphological and structural characteristics of chitosan/graphene quantum dots/titanium dioxide (CS/GQDs/TiO₂) composite films with TiO₂ concentrations of 50–250 mg/L as coating materials for modified working electrodes. The films were prepared using ionic gelation and stirring methods. Characterization was performed using Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). FTIR analysis confirmed hydrogen bonding and coordination interactions among chitosan, GQDs, and TiO₂ through the shift of –OH/–NH₂ bands and the appearance of Ti–O–Ti and C–O–Ti bands. XRD analysis showed an increase in crystallinity from 20.82% to 41.35%, indicating improved structural ordering after TiO₂ incorporation. SEM observations revealed morphological transformation from the rough surface of pure chitosan to a more compact and homogeneous structure at moderate TiO₂ concentrations, while agglomeration appeared at higher concentrations. These results demonstrate that the incorporation of GQDs and TiO₂ enhances the structural stability and morphology of the chitosan matrix, making the composite promising for electrochemical electrode coating applications.
Co-Authors Andriayani Andriayani Astri Anjelina Nasution Irwana Nainggolan