Effect of single dopants N and double dopant N-Ni on optical absorption characteristics and crystal structure of TiO₂photocatalyst materials

Modification of the TiO2 photocatalyst material has been carried out through a single N-doping and N-Ni double-doping process. Variations in the concentration of N used were 1%, 2%, and 3% while the concentration of Ni was 1%,3%, and 5%. This synthesis was carried out using the sol gel method, because the sol gel method can produce nano-sized materials with a high level of purity. The purpose of this study was to determine the optical absorption characteristics and crystal structure of TiO2 material after being given a single N and double N-Ni doping. The optical absorption characteristics were analyzed by means of uv-vis spectroscopy. While the crystal structure was observed through XRD testing. Based on the results of the UV Vis test, the optimal band gap value for the 1% N-TiO2 doping variation was 3.04 eV, while the 1% Ni-N-TiO2 doping was 2.06 eV. Based on the results of the UV Vis test, optical absorption results are also obtained on the material where the optical absorption results have shown a wavelength shift at the wavelength of visible light, which is at a wavelength of 400-800 nm. The results of the XRD test showed a decrease in the crystal size of each single-doped N and double-doped N-Ni at a doping variation of 1% which resulted in a crystal size of 30.05 nm for N-doping and for N-Ni doping of 21.05 nm and the resulting crystal structure was anatase.