介稳态氧化钨超微粉体的水热合成与光致变色性质研究  

Hydrothermal Synthesis and Photochromism Property of Superfine Powders of Metastable Tungsten Oxide

作　　者：徐英明[1] 霍丽华[1] 赵辉[1] 高山[1] 赵经贵[1] 

机构地区：[1]黑龙江大学化学化工与材料学院功能材料实验室,哈尔滨150080

出　　处：《无机化学学报》2005年第4期538-542,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20101003);黑龙江省青年攻关基金(No.QC02C41);黑龙江省自然基金(No.B0202);中科院稀土化学与物理重点实验室基金资助项目。

摘　　要：0引言由于WO3超微粉体在太阳能吸收、光催化、光致变色、传感器、军事隐形和燃料电池等方面显示出良好的应用前景[1～3],近年来有关WO3超细粉体,尤其是焦绿石型和钨青铜相的介稳态氧化钨材料制备引起广泛关注.中低温水热合成法是制备介稳态氧化物纳米材料的较好方法,但目前文献报道的采用该法制备焦绿石型和钨青铜相氧化钨超微粉体的合成条件具有一定的局限性,体系pH值、反应温度、反应时间等可调控的范围比较窄[4～6],这些条件与产物的结构及粒子大小密切相关,而它们之间又相互影响,这说明水热合成焦绿石型氧化钨的影响因素较复杂,而且对氧化钨超微粉体稳定性及光致变色性质研究的报道较少.Under hydrothermal conditions, the superfine powders of cubic pyrochlore-type of tungsten oxide and hexagonal tungsten bronze were obtained by using Na2WO4 (.) 2H(2)O as the starting material. The products were characterized by XRD, TG, IR, UV and EPMA, respectively. The effects of the pH value, the acid concentration, reaction temperature and time on the structure and particle size of products were investigated in detail. The conditions for the preparation of superfine powders of tungsten oxide were optimized. The pH 2.5 similar to 4.5 of the reaction system led to the formation of a pyrochlore phase and pH 0.5 similar to 2.0 gave the hexagonal tungsten bronze structure. The photochromism property of the hexagonal tungsten bronze was studied. The results show that pyrochlore and bronze phases are decomposed at 300 degrees C and 450 degrees C, respectively. With the increasing of temperature, the structure of the two oxides changes. The pyrochlore-type powder changes completely into triclinic Na2W4O13 around 500 degrees C, while the bronze phase into a mixture of Na2W6O19 and triclinic WO3 at 550 degrees C. The powder of the hexagonal tungsten bronze showed better photochromism property.

关 键 词：氧化钨 焦绿石 钨青铜 水热合成 超微粒子 光致变色性质 

分 类 号：O614.613[理学—无机化学]