Low-temperature molten salt synthesis and characterization of CoWO4 nano-particles

✍ Scribed by Zuwei Song; Junfeng Ma; Huyuan Sun; Yong Sun; Jingrui Fang; Zhengsen Liu; Chang Gao; Ye Liu; Jingang Zhao

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 702 KB
• Volume: 163
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2009.05.002

✦ Synopsis

CoWO 4 nano-particles were successfully synthesized at a low temperature of 270 • C by a molten salt method, and effects of such processing parameters as holding time and salt quantity on the crystallization and development of CoWO 4 crystallites were initially studied. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and photoluminescent spectra techniques (PL), respectively. Experimental results showed that the well-crystallized CoWO 4 nano-particles with ca. 45 nm in diameter could be obtained at 270 • C for a holding time of 8 h with 6:1 mass ratio of the salt to CoWO 4 precursor, and XRD analysis evidenced that the as-prepared sample was a pure monoclinic phase of CoWO 4 with wolframite structure. Their PL spectra revealed that the CoWO 4 nano-particles displayed a very strong PL peak at 453 nm with the excitation wavelength of 230 nm, and PL properties of CoWO 4 crystallites relied on their crystalline state, especially on their particle size.