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Peni Peni
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Pontianak|Tanjungpura University|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+) Imelda Hotmarisi Silalahi; Risya Sasri; Peni Peni; Titin Anita Zaharah
Jurnal Kimia Sains dan Aplikasi Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1048.067 KB) | DOI: 10.14710/jksa.25.1.1-6

Abstract

Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.
Co-Authors Imelda Hotmarisi Silalahi Risya Sasri Titin Anita Zaharah