摘要
以TiCl_4和金红石型TiO_2纳米晶为原料,采用晶种诱导水热法合成出不同粒径和形貌的纳米TiO_2。采用X射线衍射仪、透射电镜和BET氮吸附比表面仪对所得样品进行了表征。研究了晶种用量、反应温度、反应时间对TiO_2微观结构的影响。结果表明,添加晶种后,溶液中的Ti^(4+)优先在TiO_2晶种表面生长形成纳米棒,当Ti^(4+)消耗殆尽时,TiO_2的生长变为"溶解-结晶"过程。随着反应温度的升高和时间的延长,TiO_2由纳米微晶的聚集体变为纳米棒的聚集体,其晶粒尺寸逐渐变大,长径比和比表面积变小。
The nano-TiO_2 particles with different size and morphology were prepared by a crystal seed-induced hydrothermal method used TiCl_4 and rutile-TiO_2 nanocrystals as raw materials.The obtained samples were characterized by Xray diffraction（XRD）,transimission electron microscopy（TEM）and N_2 adsorption-desorption（BET）.The effects of the dosage of crystal seed,hydrothermal temperature and time on the the microstructure of TiO_2 were discussed.The results showed that after adding the crystal seed,Ti^（4＋） preferentially growed on the surface of crystal seed to form the nanorod,and when Ti^（4＋） was exhausted,the growth of TiO_2 would change into＂dissolution-crystallization＂process.With increasing hydrothermal temperature and time,the morphology changed from the aggregate of nano-crystalline to the one of nanorod.The crystalline size gradually increased,and the aspect ratio,as well as the specific surface area decreased correspondingly.
出处
《化工新型材料》
CAS
CSCD
北大核心
2017年第6期95-97,100,共4页
New Chemical Materials
基金
淮安市重点研发计划-应用研究与科技攻关类(HAG2015074)
镇江市重点研发计划--产业前瞻与共性关键技术(GY2015042)
关键词
晶种诱导
水热处理
纳米TIO2
晶粒尺寸
seed induction
hydrothermal treatment
nano-TiO2
crystalline size
