Sanyen, T.; Songpanit, M.; Kansaard, T.; Chutipaijit, S.; Boonyarattanakalin, K.; Pecharapa, W.; Mekprasart, W. Calcination temperature-dependent structural and photocatalytic properties of green-synthesized ZnO nanostructures using Mitragyna speciosa leaf extract. Creative Sci. 2026, 18, 266077.