Nguyen Xuan, Sang, Nguyen Minh Quan, Nguyen Huu Tho, Le Thi Thanh Thuy Mai, & Ho Van Cuu. " Crystalline Structure, Optical Properties and Photocatalytic Activity of Cr3+-Doped ZnO Nanoparticles." VNU Journal of Science: Natural Sciences and Technology [Online], 34.4 (2018): n. pag. Web. 22 Nov. 2024