Nguyen C, Mai T. Preparation of N-TiO2 nanomaterial and evaluation of its photocatalytic activity under visible light. VNUHCM Journal of Natural Sciences [Internet]. 31Dec.2017 [cited 4Oct.2025];1(T4):27-5. Available from: http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/493