摘要
以钨酸钠为钨源,硝酸钕为钕源,加入硫酸钾作为矿化剂,在120℃条件下通过水热法成功合成了六方相钕掺杂三氧化钨纳米粉.采用X射线衍射、扫描电镜和X射线光电子能谱分别对掺杂纳米粉的物相、形貌和掺杂成分进行了研究.结果表明,钕离子成功掺杂进入三氧化钨晶格当中,使一部分钨离子转为+5价,从而使电子从价带激发到导带并且增加了光生电子-空穴对的数量,导致其对激发光具有更大的吸收能力,光致变色性能也得到了较大的增强.在钕离子掺杂浓度为5.63%时,材料的光致变色性能最好,其色差值为纯三氧化钨色差值的13倍.
The synthesis of neodymium-doped hexagonal tungsten oxide nanopowder was reported by using sodium tungstate as the tungsten source,neodymium nitrate as the neodymium source,and potassium sulfate as the mineralizing agent.Phase composition,micro-morphology and doping content of the obtained nanopowder were studied by using X-ray diffraction analysis,scanning electronic microscopyand X-ray photoelectron spectroscopy.The result shows that only neodymium-doped hexagonal tungsten oxide was obtained in the synthesized product and no impurity was found.Due to successfully intruding Nd^3+ ion into the host lattice,partial tungsten ions were reduced to be pentavalent,which further resulted exciting electrons from valence band to conducting band and formation of additional photogenerated electron-hole pairs.Then the photochromic performance of nanoowder was found highly improved contributing to the increased absorbance of excitation light.The nanopowder with best photochromic property was obtained in the sample with a optimized trivalent neodymium ion concentration of 5.63%.Its change of color was estimated to be 13 times of that observed in the pure WO3.
作者
周卓锐
赵修建
ZHOU Zhuo-rui;ZHAO Xiu-jian(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2019年第2期183-189,共7页
Acta Photonica Sinica
基金
国家自然科学基金(No.51461135004)~~
关键词
稀土掺杂
光致变色材料
水热法
六方晶相
三氧化钨
Tungsten oxide
Powder
Rare earth ions doping
Photochromism
Hydrothemal methods
