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All Journal Molekul: Jurnal Ilmiah Kimia
Indriana Kartini
Universitas Gadjah Mada, Department of chemistry, Yogyakarta, 55281
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

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Effect of Annealing and Etching Times on Anatase TiO2 Hollow Sphere Khusna Arif Rakhman; Nurul Hidayat Aprilita; Indriana Kartini
Molekul Vol 18 No 2 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.2.7480

Abstract

The development of high-efficiency photocatalysts plays an important role in the application of solar energy conversion. Titanium dioxide (TiO2) with an anatase crystalline phase is well-known as semiconductor thin layers for solar cells. This work has constructed a novel TiO2 hollow sphere (HST) in a 2-step synthesis. The first step is coating the SiO2 template with TiO2 to build a core-shell of SiO2@TiO2 (CSST). The second step is etching via sonication to elute the SiO2 from CSST and construct the HST. The annealing of CSST for 1 to 6 hours and etching for 1 to 7 hours has resulted in the HST with different crystallite sizes and microstrains. The HST of ~90 nm has been fabricated with crystallite size of 9.53 to 20.54 nm and microstrain from 0.34 to 3.42. It was found that the optimum crystallite size and microstrain of HST obtained via annealing the CSST for 2 hours and etching for 5 hours has the best photooxidation of I- under UV irradiation. The optimum crystallite size and microstrain of HST via annealing and etching times can be recommended for the future of solar cell fabrication and applications.
Co-Authors Khusna Arif Rakhman Nurul Hidayat Aprilita