Fitri Afriani, Yuant Tiandho, Dian Ahmad Hapidin, Fenny Martha Dwivany, Khairurrijal Khairurrijal
Controlling volatile organic compounds (VOC) is of utmost importance due to their adverse impacts on human health and environment. Photocatalytic degradation using TiO2 nanoparticles has emerged as a promising approach for VOC control. However, the limited photocatalytic activity of TiO2 under visible light owing to its wide bandgap presents a significant challenge. To address this limitation, the integration of plasmonic materials with TiO2 enables efficient hot electron injection into TiO2 under visible light. In this study, we investigate the influence of gold nanoparticles (AuNP) on TiO2-based structures, namely AuNP-decorated TiO2 thin films, Au@TiO2 core@shell structures, and AuNP-loaded TiO2 nanoparticles, using finite difference time domain (FDTD) simulations. Simulation results demonstrate that the presence of AuNP in TiO2 structures reduces the bandgap and enhances light absorption. Moreover, the localized electric field enhancement observed at the AuNP-TiO2 interface indicates the potential for effective hot electron injection into TiO2. Additionally, simulations conducted in a VOC medium demonstrate higher absorption compared to vacuum conditions. This work provides insights into the mechanisms underlying previously published experiments and proposes an appealing design for the development of highly efficient photocatalytic materials under visible light. © 2023 Elsevier B.V.
Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, 40132, Indonesia; Department of Physics, Faculty of Engineering, Universitas Bangka Belitung, Kampus Terpadu UBB, Bangka, 33172, Indonesia; Department of Biology, School of Life Sciences and Technology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, 40132, Indonesia; Center for Green and Sustainable Materials, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Way Huwi, Lampung, 35365, Indonesia; Department of Physics, Faculty of Science, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Way Huwi, Lampung, 35365, Indonesia
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