Fabrication of carbon nanotubes thin films for biosensor applications via electrodeposition method

Ramalingam, Priyatharshini (2024) Fabrication of carbon nanotubes thin films for biosensor applications via electrodeposition method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In the fabrication of carbon nanotubes thin films for biosensor applications via electrodeposition, a common approach involves the utilization of nanomaterials such as carbon nanotubes or graphene as the sensing elements . Carbon nanotube (CNT) composites are potential functional materials because to their exceptional qualities in addition to metal features, and as a result, several production procedures for these composites have been extensively investigated. This paper proposes electrodeposition as an alternate approach for generating Multiwalled Carbon Nanotubes (MWCNT) thin film. In the case of electrodeposition using CNT templates, the electrodeposition of metals not only on the surfaces but also interior of the CNT templates is the key process to fabricate high performance CNT composite. The chronoamperometry technique is used in this study to create a nanofilm of Polypyrrole (PPY) and Multiwalled Carbon Nanotube (MWCNT). The electrodeposition and cyclic voltammetry of the produced nanofilm are carried out with an AutoLAB potentiostat and NOVA 2.0 AutoLAB software. The nanofilm is characterized using Fourier transform infrared spectroscopy (FTiR) and field emission scanning electron microscopy (FE-SEM) to examine its shape and material characteristics. The carbon electrode had the maximum current at 1.326 mA ,after 3 minutes of chronoamperometry with PPY/MWCNT 1.5 hours sonication. However, lengthier chronoamperometry techniques provide different findings. After 5 minutes, the carbon electrode has the largest current (0.929 mA), followed by stainless steel (0.721 mA) and indium tin oxide (0.350 mA). Furthermore, after 3 minutes of PPY/MWCNT 3 hours sonication, the carbon electrode has the maximum current at 0.972 mA, followed by stainless steel at 0.954 mA and 0.496 mA. After 5 minutes, the carbon electrode recorded the maximum current (0.898 mA), followed by stainless steel (0.836 mA) and indium tin oxide electrode (0.437 mA). This study offers valuable guidance for creating smooth nanostructured films on various substrates for diverse purposes.

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