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材料工程  2017, Vol. 45 Issue (11): 58-65    DOI: 10.11868/j.issn.1001-4381.2017.000459
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
W掺杂二氧化钒的水热晶化机理及其相变性能
李尧1, 卢怡2, 曹文斌1,3
1. 北京科技大学 材料科学与工程学院, 北京 100083;
2. 解放军306 医院 口腔科, 北京 100101;
3. 北京科技大学 天津学院, 天津 301830)
Crystallization Mechanism and Phase Transition Properties of W-doped VO2 Synthesized by Hydrothermal Method
LI Yao1, LU Yi2, CAO Wen-bin1,3
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Department of Stomatology, the 306 Hospital of PLA, Beijing 100101, China;
3. Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China
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摘要 以硫酸氧钒为钒源,采用沉淀-胶溶法制备VO2溶胶。然后向溶胶中加入偏钒酸铵,利用溶胶水热晶化制备出W掺杂二氧化钒(W-VO2,M相)粉体。通过XRD,FESEM和DSC对合成产物的物相组成、形貌和相变性能进行研究。结果表明:在280℃条件下水热处理4~48h,VO2溶胶经过水热晶化生成长约1~2μm、直径约100~200nm棒状W-VO2(B)晶体,伴随着B相向M相晶型转变,W-VO2(B)逐渐消溶,而W-VO2(M)逐渐长大,形貌由棒状转变为片状或雪花状;W-VO2(M)相变温度随着W掺杂量增加而降低,当名义掺杂量为6.0%(原子分数)时,相变温度降低到28℃。根据水热晶化和形貌演变过程,提出了W-VO2(M)可能的"形核-生长-转化-熟化"形成机理。
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李尧
卢怡
曹文斌
关键词 二氧化钒水热合成相变温度钨掺杂    
Abstract:VO2 sol was firstly prepared using vanadyl sulfate as a vanadium source by precipitation-peptization method. Then tungsten(W) doping vanadium dioxide(W-VO2) was prepared by hydrothermal crystallization of prepared sol with the presence of ammonium metatungstate. The morphologies, crystal structure of the as-prepared samples and phase transition properties were studied by X-ray diffraction(XRD), field emission scanning electron microscope(FESEM)and differential scanning calorimetry(DSC) analysis. The results indicate that rod-like W-VO2(B) crystal with length of 1-2μm and radius of 100-200nm is firstly formed during hydrothermal treatment for 4-48h at 280℃, then the rod-like crystal dissolves gradually and sheet-like or snowflake-like crystal is formed with the phase transition from W-VO2(B) to W-VO2(M) and eventually, the W-VO2(M) crystals can further grow up while the W-VO2(B) gradually dissolves; the phase transition temperature of VO2 decreases with the increase in W doping content, and the phase transition temperature of W-VO2(M) reduces to about 28℃ when the nominal dopant concentration is 6.0%(atom fraction).The "nucleation-growth-transformation-ripening" mechanism is proposed as the formation mechanism based on the hydrothermal crystallization and morphological evolution process of W-VO2(M).
Key wordsvanadium dioxide    hydrothermal synthesis    transition temperature    tungsten doping
收稿日期: 2017-04-16      出版日期: 2017-11-18
中图分类号:  O614.51  
通讯作者: 曹文斌(1970-),男,教授,博士,主要从事半导体光催化材料、电磁波吸波材料、特种热致相变材料的研究工作,联系地址:北京市海淀区学院路30号北京科技大学主楼425室(100083),E-mail:wbcao@ustb.edu.cn     E-mail: wbcao@ustb.edu.cn
引用本文:   
李尧, 卢怡, 曹文斌. W掺杂二氧化钒的水热晶化机理及其相变性能[J]. 材料工程, 2017, 45(11): 58-65.
LI Yao, LU Yi, CAO Wen-bin. Crystallization Mechanism and Phase Transition Properties of W-doped VO2 Synthesized by Hydrothermal Method. Journal of Materials Engineering, 2017, 45(11): 58-65.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.000459      或      http://jme.biam.ac.cn/CN/Y2017/V45/I11/58
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