<![CDATA[Titanium dioxide (TiO₂) is a semiconductor material that is widely used for photocatalytic applications, but it has a relatively large band gap value so that its activity in the visible light region is limited. This study aims to analyze the effect of CuO doping and the addition of monoethanolamine (MEA) additives on the band gap value of TiO₂ synthesized by the sol-gel method. CuO doping was carried out using CuCl₂·2H₂O precursor with concentration variations of 5%, 10%, 15%, 20%, and 25%. The optimum concentration was then combined with variations in MEA volume of 1 mL, 2 mL, and 3 mL. The synthesized material was characterized using UV-DRS and the band gap value was calculated using the Kubelka-Munk approach. The results of the study showed that the addition of CuO doping caused a decrease in the band gap value of TiO₂ from 3.33 eV to 3.29 eV at an optimum concentration of 15%. The addition of MEA further reduced the band gap, with the lowest value being 3.27 eV at 3 mL MEA volume. This decrease indicates that CuO doping and MEA additives play a role in modifying the electronic structure of TiO₂, thereby narrowing the energy band gap. Thus, the combination of CuO and MEA doping has the potential to enhance the optical response of TiO₂ in the visible light region, namely the range 400 – 800 nm]]>
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