Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Aug 14;129:377-81. doi: 10.1016/j.saa.2014.03.051. Epub 2014 Apr 3.
A novel multi-metal nanocomposite, Co3O4·CeO2·ZnO has been prepared by co-precipitation of their carbonates from aqueous solutions of the metal nitrates following calcining and annealing 5h at 450°C and 10h at 950°C. Co3O4·CeO2·ZnO has been characterized by XRD, SEM, EDS, IR and PL spectra. The crystallite size of the as-synthesized sample varies in the range of 9-33nm and those of the annealed sample in the range of 19-42nm. Emissions of Co3O4·CeO2·ZnO were observed in UV and visible region at different excitations. Excitation wavelength dependent PL behavior of Co3O4·CeO2·ZnO has been observed in acetone. This PL property is contrary to the well-known Kasha's rule of excitation wavelength dependence of emission spectrum.
一种新型多金属纳米复合材料 Co3O4·CeO2·ZnO，是通过金属硝酸盐的碳酸盐在水溶液中共同沉淀，然后在 450°C 下煅烧和退火 5 小时，在 950°C 下退火 10 小时而制备的。Co3O4·CeO2·ZnO 已通过 XRD、SEM、EDS、IR 和 PL 光谱进行了表征。合成样品的晶粒尺寸在 9-33nm 范围内，而退火样品的晶粒尺寸在 19-42nm 范围内。在不同激发下，Co3O4·CeO2·ZnO 在 UV 和可见光区域都有发射。在丙酮中观察到 Co3O4·CeO2·ZnO 的激发波长依赖性 PL 行为。这种 PL 性质与众所周知的激发波长依赖性发射光谱的 Kasha 规则相反。
