Synthesis and characterization of electrodeposited Bi2Te3-graphene nanocomposite film

Thiagarajan, Eswaran (2022) Synthesis and characterization of electrodeposited Bi2Te3-graphene nanocomposite film. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The project titled “Synthesis and Characterization of Electrodeposited Bi2Te3- Graphene Nanocomposite Film” has been carried out. The inclusion of graphene is needed to increase electrical conductivity and reduce the effect of Seebeck coefficient reduction. The Bi2Te3 film incorporated with high percentage of graphene has been successfully synthesized. The Graphene/Bi2Te3 nanocomposite films were synthesized by using electrodeposition process with pulsed potentiostatic deposition. Prior to electrodeposition process, good dispersion and suspension of graphene in the electrolyte solution has been successfully prepared. The electrolyte solution went through magnetic stirrer and sonification process approximately for one and half hour to obtain good dispersion and suspension of Graphene/Bi2Te3 electrolyte solution without aggregation form in electrolyte. The CV analysis shows, with graphene introduction in the electrolyte solution of 1wt%, 3wt%, and 5wt%, have a maximum peak reduction of potential value started hitting -50 mV and became maximum at -70 mV at the 5wt% graphene content. While, the pristine Bi2Te3 have peak reduction potential at -5mV. The characterization of the films was conducted by using scanning electron microscope (SEM) and energy dispersive X-ray (EDX). In SEM the microstructure size of inclusion of graphene gradually become smaller when compere to pristine Bi2Te3. Reduce size of microstructure cause increased the porosity. Used average values from an EDX measurement system, up to 2.7% graphene has been successfully deposited in the nanocomposite film.

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