溶胶-凝胶-水热法低温合成钆掺杂钛酸铋纳米片

Low-temperature Synthesis of Gd-doped Bismuth Titanate Nanosheets by Sol-gel-hydrothermal Method

采用溶胶-凝胶-水热法在180℃的较低温度下成功制备了结晶良好的单相钆掺杂钛酸铋(Bi_(3.15)Gd_(0.85)Ti_(3)O_(12),BGTO)纳米片。研究了水热反应温度和反应时间对BGTO粉体结构和形貌的影响。结果表明,反应温度太低或反应时间太短会导致BGTO结晶不充分,主要形成为非晶相。随反应温度提高和反应时间的延长,BGTO纳米片的结晶度及尺寸均有所提高。以3 mol/L NaOH水溶液作为矿化剂,在水热反应温度180℃,水热反应时间24 h的条件下获得了结晶优良、形貌规整且尺寸均匀的BGTO纳米片,其边缘平均尺寸为420 nm,平均厚度为18 nm。实验结果表明溶胶-凝胶-水热法具有溶胶-凝胶法和水热合成法的双重优势。

A sol-gel-hydrothermal method was used to successfully prepare well-crystallized single-phase Gd-doped bismuth titanate(Bi_(3.15)Gd_(0.85)Ti_(3)O_(12),BGTO)nanosheets at a temperature as low as 180℃.The effects of hydrothermal reaction temperature and time on the structure and morphology of the samples were studied.The results show that when the hydrothermal reaction temperature is too low or the hydrothermal reaction time is too short,the crystallization of BGTO is insufficient and the amorphous phase was mainly formed.The crystallinity and nanosheet size of BGTO nanosheets increase with the increase of reaction temperature and time.With 3 mol/L NaOH aqueous solution as a mineralizer,pure BGTO nanosheets with excellent crystallinity,regular morphology and uniform size were obtained under the condition of hydrothermal reaction at 180℃for 24 hours,with an average edge size of 420 nm,and average thickness of 18 nm.The sol-gel-hydrothermal method has the dual advantages of the sol-gel method and the hydrothermal synthesis method.