TiO2 incorporated carbon quantum dot nanocomposite, (CQDs@TiO2) was synthesized and applied as a new modifier for carbon paste electrode (CPE). The synthesis process consisted of two steps: the synthesis of a carbon quantum dot (CQDs) solution electrochemically and the synthesis of CQDs@TiO2 by impregnation. The characterization results show that the morphology of CQDs@TiO2 is composed of small particles with different particle sizes which causes the nanocomposite surface to be non-uniform. The impregnation process causes a change in the average particle size of TiO2 from 29.32 to 33.23 nm. This process also produces new diffractograms at positions 2Θ=53.75° and 54.95° . In addition, its process changes the specific wave number absorption (1/λ) TiO2 for -OH stretching (3,300 cm-1 to 3,369 cm-1) and -OH bending (1,631 cm-1 to 1,660 cm-1). This shift in wavenumber was followed by the presence of new absorption at wavenumbers of 2,162 cm-1 and 1,371 cm-1. Based on the performance test of CQDs@TiO2 as a CPE modifier, it shows that CQDs@TiO2 improves CPE performance in the Fe(CN)6 3-/Fe(CN)6 4- solution system. It is characterized by an increase in both oxide and reducing currents and a narrowing of the voltammogram peaks. The optimum mass of CQDs@TiO2 as a CPE modifier is 0.01 g with an electroactive surface area of 0.27 cm2. The overall results of this work indicate that the CQDs@TiO2 nanocomposite can be applied as an electrode modifier for electrochemical sensor applications in the future.

New Modifier CQDs@TiO2 Nanocomposite CPE Fe(CN)6 3-/Fe(CN)6 4-

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