Institute of Nanostructured Materials and Tianjin Key Laboratory of Fiber Modification and Functional Fiber, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin, China.
Langmuir. 2011 Jul 19;27(14):8878-84. doi: 10.1021/la201749z. Epub 2011 Jun 21.
This paper presents a facile hydrothermal route to synthesize monodispersive and single-crystalline BaHfO(3) hollow micro- and nanospheres in a concentrated basic environment. The hollow spheres were size tunable from submicrometer to nanoscale by simply adjusting the base concentration at a suitable temperature. The base concentration played the key role on forming BaHfO(3) hollow spheres. Detailed investigations on base concentration, reaction temperature, and duration indicated that the formation of BaHfO(3) hollow spheres was driven by Ostwald ripening process. Because of the abundance of defects, the as-prepared BaHfO(3) hollow nanospheres exhibited a blue light emission under UV-light excitation at room temperature. Calcination led to the photoluminescence declination due to the decrease of defects.
本文提出了一种简便的水热法，在浓堿环境下合成单分散、单晶 BaHfO(3) 中空微纳球。通过简单调整合适温度下堿的浓度，可将中空球的尺寸从亚微米调至纳米级。堿浓度在形成 BaHfO(3) 中空球中起关键作用。对堿浓度、反应温度和时间的详细研究表明，BaHfO(3)中空球的形成是由奥斯特瓦尔德熟化过程驱动的。由于缺陷丰富，所制备的 BaHfO(3)中空纳米球在室温下的紫外光激发下表现出蓝光发射。煅烧导致光致发光衰退，这是由于缺陷减少所致。
