Superior Performance Application of TiO2 Nanocomposites Doped Carbon Dots of Different Sizes as Carbon Paste Electrode Modifiers

Document Type : Original Article

Authors

1 Study Program of Agricultural Science, Post Graduate School, Universitas Halu Oleo, Southeast Sulawesi, Indonesia

2 Department of Plant Protection, Faculty of Agriculture, Universitas Halu Oleo, Southeast Sulawesi, Indonesia

3 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Halu Oleo, Southeast Sulawesi, Indonesia

Abstract

In this study, electrochemical green synthesis, characterization, and application of Carbon dot-doped TiO2 nanocomposites (TiO2@CDs) as carbon paste electrode modifiers have been carried out. The preparation of nanocomposites begins with the synthesis of carbon dots (CDs) by varying the value of the oxidation potential. The obtained CDs were incorporated on the surface of TiO2 through continuous stirring at room temperature followed by heating at a constant temperature of 140oC for 4 hours. To determine the effect of potential variations of CDs on the characteristics of nanocomposites, we used SEM, XRD, and FTIR. Based on SEM characterization, potential variations of CDs didn’t affect or change the surface morphology of TiO2. TiO2 has a characteristic surface morphology which is composed of spherical particles of uniform size. However, XRD and FTIR characterization showed that the potential variation of CDs caused a 2θ angle shift and TiO2 wavenumber in the fingerprint region. Potential variations of CDs caused the average particle size of TiO2 to increase from 37.32 nm to 42.89 nm, 45.12 nm, and 49.01 nm for oxidation potentials of 10 V, 15, and 20 V, respectively. The results of the electrochemical characteristics showed superior performance of CPE in the Fe(CN)63-/Fe(CN)64- solution system after being modified with TiO2@CDs. Superior performance is demonstrated by significantly increased peak currents, both oxidizing and reducing. This phenomenon is strongly influenced by the size of the synthesized CDs particles through potential variations. Based on these results, a potential of 15 V is stated as the best potential in the application of CDs as a modifier.

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Main Subjects

Analytical and Bioanalytical Electrochemistry
Volume 15, Issue 9 - Serial Number 9
September 2023
Pages 711-725

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History

  • Receive Date: 05 May 2023
  • Revise Date: 24 September 2023
  • Accept Date: 25 September 2023

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