二氧化钛纳米棒的制备及其晶体生长机理分析

doi:10.3724/SP.J.1077.2012.00045

无机材料学报 ›› 2012, Vol. 27 ›› Issue (1): 45-48.DOI: 10.3724/SP.J.1077.2012.00045

二氧化钛纳米棒的制备及其晶体生长机理分析

陈超, 王智宇

(浙江大学硅材料国家重点实验室, 材料科学与工程学系, 杭州 310027)

收稿日期:2011-04-08 修回日期:2011-06-10 出版日期:2012-01-09 网络出版日期:2011-12-19
作者简介:陈超(1986-), 男, 硕士. E-mail: chenchaonano@zju.edu.cn
基金资助:
国家自然科学基金(50928201, 50972127, 51010002);浙江省自然科学基金(Z4080021, Y4090067);教育部博士点基金(20100101110039);中央高校基本科研业务费专项基金

Synthesis and Crystal Growth Mechanism of Titanium Dioxide Nanorods

CHEN Chao, WANG Zhi-Yu

(State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China)

Received:2011-04-08 Revised:2011-06-10 Published:2012-01-09 Online:2011-12-19
Supported by:
National Natural Science Foundation of China (50928201, 50972127, 51010002);Natural Science Foundation of Zhejiang Province (Z4080021, Y4090067);Doctoral Fund of Ministry of Education of China (20100101110039);Fundamental Research Funds for the Central Universities

摘要/Abstract

摘要：

采用溶剂热法合成具有高结晶性与单分散性的TiO₂纳米棒. 采用TEM、XRD、HRTEM等对样品的微观结构进行表征, 并考察了TiO₂纳米棒对亚甲基蓝的光催化性能. 通过控制反应时间、反应温度, 研究纳米棒的形貌演变规律.结果表明, 可以通过“奥斯特瓦尔德熟化”和“取向接触”两种晶体生长过程制备出棒状TiO₂纳米晶, 降低纳米晶的表面能是晶体生长与形貌演变的主要驱动力; 高结晶性的TiO₂纳米棒具有高于P25的光催化能力.

关键词: TiO₂纳米棒, 晶体生长, 光催化, 奥斯特瓦尔德熟化, 取向接触

Abstract:

Highly crystalline and monodisperse anatase TiO₂ nanorods were synthesized successfully via an improved solvothermal method. The shape evolution of TiO₂ nanorod was investigated by adjusting the reaction parameters, such as reaction duration and temperature. The phase structures, morphologies, and sizes of as-prepared TiO₂ nanoparticles were investigated in detail by XRD, TEM, and HRTEM. The photocatalytic properties of the product were measured by decomposition of methylene blue under full spectrum light irradiation. When Ostwald Ripening is dominant, the TiO₂ nanorods grow along the <001> crystallographic direction. When Ostwald Ripening is depressed at lower temperature, Oriented Attachment occurs. And primary nanoparticles join together by sharing a common (001) facet. The driving force of shape evolution and crystal growth of TiO₂ nanocrystals is reducing the high surface free energy. Compared with P25, the as-prepared TiO₂ nanorods exhibit a superior photocatalytic activity, which is attributed to the high crystallinity.

Key words: TiO₂ nanorod, crystal growth, photocatalyst, Ostwald ripening, oriented attachment

中图分类号:

O482

陈超, 王智宇. 二氧化钛纳米棒的制备及其晶体生长机理分析[J]. 无机材料学报, 2012, 27(1): 45-48.

CHEN Chao, WANG Zhi-Yu. Synthesis and Crystal Growth Mechanism of Titanium Dioxide Nanorods[J]. Journal of Inorganic Materials, 2012, 27(1): 45-48.

图/表 5

图1 不同奥斯特瓦尔德熟化时间制备样品的TEM和HRTEM照片

Fig. 1 TEM and HRTEM images of TiO2 nanoparticles prepared via Ostwald ripening for different time

图2 通过奥斯特瓦尔德熟化生长出的TiO2纳米棒的XRD图谱

Fig. 2 XRD pattern of TiO2 nanorod grown by Ostwald Ripening at 280℃ for 24 h

图3 通过取向接触生长出的哑铃状TiO2纳米棒的TEM和HRTEM照片

Fig. 3 (a) TEM and (b) HRTEM images of TiO2 dumbbell- like nanorods grown by Oriented Attachment

图4 通过奥斯特瓦尔德熟化(OR)和取向接触(OA)形成TiO2纳米棒示意图

Fig. 4 Formation schematic illustration of TiO2 nanorods via Ostwald Ripening (OR) and Oriented Attachment (OA)

图5 TiO2纳米棒和P25光催化性能比较

Fig. 5 Catalytic properties of TiO2 nanorods and P25

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二氧化钛纳米棒的制备及其晶体生长机理分析

Synthesis and Crystal Growth Mechanism of Titanium Dioxide Nanorods

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