Eka Nurfani, M. Pait Ali, Aditya Rianjanu, Lukman Nulhakim, M. Samsul Anrokhi, Grandprix T.M. Kadja
In this paper, we study the effect of solution molarity on the optical and photocatalytic properties of ZnO thin films fabricated by chemical spray pyrolysis. The films were grown on glass substrates for 30 s with a molarity variation of 0.1–0.5 M. From structural, morphological, and compositional analysis, the ZnO films were successfully grown on the substrate for all samples. In the sample with a molarity of 0.1 M, rods with a length of 2–50 μ m and a diameter of ∼1 μ m are formed at the 0.1 M sample. The length of rods decreased to 1–25 μ m, and the diameter decreased to ∼200 nm by increasing solution molarity up to 0.5 M. Furthermore, we found that the solution molarity can narrow the optical bandgap, which is probably caused by the increase of oxygen vacancies concentration. This bandgap narrowing is strongly affected photocatalytic performance, as shown by the optimum photodegradation rate and efficiency. This simple synthesis technique is essential to improve the functionality of ZnO as photocatalytic material. © 2023 Elsevier B.V.
Department of Materials Engineering, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Department of Engineering Physics, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Department of Physics, Institut Teknologi Sumatera, Terusan Ryacudu, Lampung, 35365, Indonesia; Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10, Bandung, 40132, Indonesia; Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Ganesha 10, Bandung, 40132, Indonesia; Center for Catalysis and Reaction Engineering, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, 40132, Indonesia
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