Morphology-controlled synthesis and growth mechanism of lead-free bismuth sodium titanate nanostructures via the hydrothermal route
Morphology-controlled synthesis and growth mechanism of lead-free bismuth sodium titanate nanostructures via the hydrothermal route
复制标题
水热法无铅钛酸铋钠纳米结构的形貌控制合成及生长机制
DOI：
10.1039/c3ce40139a
复制
发表时间：
2013-01-01
期刊：
影响因子：
3.1
通讯作者：
Cao, Maosheng
中科院分区：
文献类型：
--
作者：
Lu, Ran;Yuan, Jie;Cao, Maosheng
采用简单的水热法制备了无铅钛酸铋钠(Bi0.5Na0.5TiO3，BNT)钙钛矿纳米结构，包括纳米片、纳米立方体和纳米线，不需要任何添加剂和模板。通过调节反应时间和氢氧化钠浓度来控制水热合成的BNT的结晶和形貌，并用X射线衍射仪、扫描电子显微镜、透射电子显微镜和高分辨透射电子显微镜对其进行了详细的表征。在2 0 0℃、氢氧化钠浓度为8~12 M、反应时间为48h的条件下，得到了长度为4 0 0 nm、厚度为数纳米的BNT纳米板.在2 0 0℃、NaOH浓度为16~18M、反应时间为36~48h的条件下，得到了长度为1~2μm的BNT立方体，当保温时间延长至60h时，得到了直径为5 0 0 nm、长度大于5μm的BNT纳米线，并对不同形貌的BNT纳米结构的生长机理进行了探讨.
Lead-free bismuth sodium titanate (Bi0.5Na0.5TiO3, BNT) perovskite nanostructures including nanoplates, nanocubes and nanowires were synthesized by a facile hydrothermal method without any additives or templates. The crystallization and morphologies of the hydrothermal derived BNT were controlled by simply adjusting the reaction time and NaOH concentration, which were examined by XRD, SEM, TEM and HRTEM techniques in detail. The BNT nanoplates of 400 nm in length and several nanometers in thickness were obtained at 200 °C for 48 h with NaOH concentration of 8–12 M. The uniformly BNT cubes of 1–2 μm in length were synthesized at 200 °C with NaOH concentration of 16–18 M for 36–48 h. The BNT nanowires with 50–100 nm in diameter and more than 5 μm in length were obtained when the holding time was prolonged to 60 h. The probable growth mechanisms of the BNT nanostructures with various morphologies were proposed.