Synthesis and photochromic properties of WO3 powder induced by oxalic acid

• 来源期刊: 中国科学B辑（英文版）
• 年，卷（期）: 2009,（5）
• 页码范围: 609-614
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11426-009-0095-y

摘要

Tungsten trioxide powder with the novel morphology was prepared via the hydrothermal method with oxalic acid as the organic inducer, the structure and shape of which were detected by X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET. Furthermore, photochromic properties of the as-prepared powder samples were tested by an ultraviolet-visible spectrophotometer combined with a color difference meter. The corresponding results indicated that the induced product was still hex- agonal WO3, made up of regularly spindle particles with 200--300 nm in length and 30--50 nm in width. The ratio of the length and width was from 4 to 10. Moreover, the special morphology improved its ab-sorptive capacity to the excitation light source, resulting in its high photochromic properties.