Analisis Pemilihan Dopan dalam Menurunkan Energi Band Gap pada Sintesis Lapisan TiO2

Abstract

In an effort to preserve the environment, various efforts were made to treat waste, one of which was through a photocatalyst of a thin layer of TiO₂. A thin layer of pure TiO₂ has a band gap energy of 3.2 eV which causes only able to work on UV light. Therefore, various studies have been carried out to reduce the band gap energy of TiO2, so that it is able to work in areas of the visible light spectrum. One method of reducing TiO2 band gap energy is by adding certain dopants. This study aims to analyze various dopants in the synthesis of thin phase TiO2 layers. Data collection techniques were carried out with observations in 25 journals and articles. The analysis focused on the success rate of dopants in reducing band gap energy and the availability of dopants in nature. The results of the analysis showed that magnesium metal (Mg) was able to reduce the band's most effective energy gap to 1.78 eV. This is also supported by research data that show an abundance of magnesium availability in nature.