Control Over the Crystallinity and Defect Chemistry of YVO4 Nanocrystals for Optimum Photocatalytic Property
Control Over the Crystallinity and Defect Chemistry of YVO4 Nanocrystals for Optimum Photocatalytic Property
复制标题
控制 YVO4 纳米晶体的结晶度和缺陷化学以获得最佳光催化性能
DOI：
10.1002/ejic.201001341
复制
发表时间：
2011-05
期刊：
影响因子：
--
通讯作者：
Liping Li
中科院分区：
文献类型：
--
作者：
Liusai Guang;Guangshe Li;Wanbiao Hu;Minglei Zhao;Lang Sun;Jing Zheng;Tingjiang Yan;Liping Li
这项工作报告了 YVO4 纳米颗粒结晶度和缺陷化学的动力学控制，以优化其光催化性能。 YVO4 纳米颗粒在室温下通过沉淀法制备，然后在选定的温度 ≤ 500 °C 的空气中退火，以调整其结晶度和缺陷特征。通过对样品表征的系统评估，发现所制备的样品以纯四方锆石型结构结晶，并且颗粒表面发生水合。退火后，所有 YVO4 纳米颗粒都会脱水，从而增加了微晶尺寸并提高了样品的结晶度。与文献中报道的许多其他氧化物纳米颗粒相比，YVO4纳米颗粒微晶尺寸的增加导致了晶格膨胀，正如通过V-O键共价键的增强和拉曼频率模式的系统变化所观察到的那样，这是由于颗粒表面上氧空位的产生。氧空位的存在不仅在电子结构中引入了较深的受主能级，从而产生稍微变窄的带隙和较宽的可见光发射，而且还提高了颗粒的光催化活性；后一种效果也是样品结晶度提高的结果。
This work reports on the kinetic control over the crystallinity and defect chemistry of YVO4 nanoparticles for the optimization of their photocatalytic performance. YVO4 nanoparticles were prepared at room temperature via a precipitation method and then annealed in air at selected temperatures ≤ 500 °C to tune their crystallinity and defect features. By systematic evaluation of the sample characterizations, it has been found that the as-prepared samples crystallized in a pure tetragonal zircon-type structure, and the surfaces of the particles are hydrated. Upon annealing, all YVO4 nanoparticles became dehydrated, which increased the crystallite sizes and improved the crystallinity of the samples. In contrast to many other oxide nanoparticles reported in literature, the increase in crystallite size of YVO4 nanoparticles led to a lattice expansion, as observed by enhancement of the covalency of the V–O bonds and the systematic shifts in the Raman frequency modes, owing to the generation of oxygen vacancies on particle surfaces. The presence of oxygen vacancies not only introduced a deep acceptor level in the electronic structure that gives rise to a slightly narrowed band-gap and a broad visible emission, but also improved the photocatalytic activity of the particles; this latter effect is also a consesqence of the improved crystallinity of the samples.
登录
查看更多内容
影响因子：
8.6
作者：
Yu, JC;Yu, JG;Zhang, LZ
通讯作者：
Zhang, LZ
非磁性Ca2掺杂CeO2纳米晶的合成及其室温铁磁性
影响因子：
3.5
作者：
Zou, Zhigang;Qiu, Xiaoqing;Chen, Xiaobo;Li, Liping;Li, Guangshe;Su, Yiguo
通讯作者：
Su, Yiguo
DOI：
10.1088/0953-8984/16/39/040
发表时间：
2004-10
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
N Y Garces;K T Stevens;G. Foundos;L. Halliburton
通讯作者：
N Y Garces;K T Stevens;G. Foundos;L. Halliburton
影响因子：
0.6
作者：
Y. Voron’ko;A. Sobol;V. Shukshin;A. I. Zagumennyi;Y. Zavartsev;S. Kutovoi
通讯作者：
Y. Voron’ko;A. Sobol;V. Shukshin;A. I. Zagumennyi;Y. Zavartsev;S. Kutovoi
影响因子：
3.7
作者：
K. N. Yu;Y. Xiong;Y. Xiong;Yu-long Liu;C. Xiong
通讯作者：
K. N. Yu;Y. Xiong;Y. Xiong;Yu-long Liu;C. Xiong