Screen-Printed Carbon Electrode Modified GNPs/ZnO For Electrochemical Biosensing
Atik Dwi Oktaviani (1*), Robeth Viktoria Manurung (2) (1) Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology. - Indonesia
(2) National Research and Innovation Agency Republic of Indonesia - Indonesia - [ https://www.scopus.com/authid/detail.uri?authorId=57205249128 ]
(*) Corresponding Author
Received: October 19, 2023; Revised: December 12, 2023
Accepted: January 02, 2024; Published: August 31, 2024
Abstract
Screen-printed carbon electrodes (SPCEs) modified with graphene nanoplatelets (GNPs) and zinc oxide (ZnO) are widely used in electrochemical sensors due to their enhanced electrochemical properties and biocompatibility. Screen-printed carbon electrodes modified with Graphene nanoplatelets (GNPs) /Zinc oxide (ZnO) nanocomposite are described. Thus, in this study, GNPs/ZnO nanocomposite was synthesized, characterized, and applied to an electrochemical sensor. The formation of GNPs/ZnO nanocomposite was characterized by UV-Vis spectroscopy and scanning electron microscopy. Moreover, SPCE-GNPs/ZnO nanocomposite were characterized using cyclic voltammetry to optimize the concentration of nanocomposite. Then, the analytical performance of the sensor was studied by measuring methylparaben as an organic compound using differential pulse voltammetry (DPV) as a preliminary study before using it for biosensing. The result showed a significant improvement in electrocatalytic activity and reproducibility. The ratio of GNPs/ZnO nanocomposite with a concentration of 1 mg/mL produced the highest current response. Moreover, the detection of methylparaben showed high sensitivity with a limit of detection (LOD) around 9.7 μM, indicating high selectivity and good reproducibility of SPCE-GNPs/ZnO. Hence, the proposed sensor of SPCE-GNPs/ZnO displayed good performance, sensitivity, and reproducibility.
http://dx.doi.org/10.55981/jet.593 Keywords
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