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采用爆轰法制备了纳米TiO2混晶体，初步研究了不同煅烧温度（600 ℃和720 ℃）和不同煅烧时间（1 h，2 h，3.5 h和5 h）对其微结构和结构相变行为的影响，并应用热动力学理论讨论了从锐钛矿相到金红石相的结构相变过程和相变机理. 研究表明：随着煅烧温度的升高和煅烧时间的增加，纳米TiO2的粒径逐渐增大，混晶中金红石相的含量逐渐提高. 与常规方法制备的纳米TiO2不同的是，在相同煅烧温度和煅烧时间下金红石相的平均生长速率明显低于锐钛矿相. 锐钛矿相完全相变为金红石的温度也明显低于常规方法报道的相变温度. 该研究会对控制纳米TiO2 晶体尺寸和批量合成提供一定的理论和实验指导.Nanopaticles of TiO2 mixed crystals (anatase phase and rutile phase) are prepared by detonation method. Morphologies and structural phase transformation behaviors of the as-prepared TiO2 nanopaticles are investigated for different annealing temperatures (600 ℃ and 720 ℃) and durations of annealing time (1, 2, 3.5, and 5 h). The structural phase transformation process and transformation mechanism are also discussed within the framework of the thermodynamic theory. Results show that with the increase of the annealing temperature and annealing time, the particle size of the detonation-prepared TiO2 nanoparticles increases gradually and the relative content of rutile phase in the TiO2 mixed crystal nanopaticles is improved. Compared with the TiO2 nanoparticles prepared by the conventional methods, the mean growth rate of rutile phase is obviously slower than that of anatase phase at the same annealing temperature and annealing time. It is obvious that the temperature at which the anatase phase completely changes into the rutile phase is lower than that of the TiO2 nanoparticles prepared by using other methods. These results are helpful for realizing the control of particle size and phase transformation of TiO2 nanoparticles. Meanwhile, the results can also provide us the theoretical and experimental bases for mass production of TiO2 nanoparticles in the future.
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Keywords:
- TiO2 nanoparticles /
- phase transformation /
- detonation method /
- thermal treatment
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[19] Qu Y D, Li X J, Yan H, Ouyang X 2008 Glass Phys. Chem. 34 637
[20] Gribb A A, Banfield J F 1997 Am. Mineral 82 717
[21] Qu Y D, Li X J, Li R Y, Yan H H, Ouyang X, Wang X H 2008 Mater Res. Bull. 43 97
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[24] Li W, Ni C, Lin H, Huang C P, S Ismat Shaha 2004 J. Appl. Phys. 96 6663
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[26] Puri P, Yang V 2007 J. Phys. Chem. C 111 11776
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[1] Tanaka K, Capule M F V, Hisanaga T 1991 Chem. Phys. Lett. 187 73
[2] Zhang T H, Piao L Y, Zhao S L, Xu Z, Wu Q, Kong C 2012 Chin. Phys. B 21 118401
[3] Xiong B T, Zhou B X, Bai J, Zheng Q, Liu Y B, Cai W M, Cai J 2008 Chin. Phys. B 17 3713
[4] Ghanbary F, Modirshahla N, Khosravi M, Behnajady M A 2012 J. Environ Sci-China 24 750
[5] Ohsaka T, Yamaoka S, Shimonmura O 1979 Solid State Community 30 345
[6] Fang D, Luo Z P, Huang K L, Lagoudas D C 2011 Appl. Surf. Sci. 257 6451
[7] Perego C, Revel R, Durupthy O, Cassaignon S, Jolivet J P 2010 Solid State Sciences 12 989
[8] Li W, C Ni, Lin H, Shah S I, Huang C P 2004 J. Appl. Phys. 96 6663
[9] Li G H, Xu Z D, Wang D W 2002 J. Inorg. Mater 17 422 (in Chinese) [李国华, 徐铸德, 王大伟 2002 无机材料学报 17 422]
[10] Yue L H, Shui M, Xu Z D, Zheng Y F 2000 Chinese J. Inorg. Chem. 16 793 (in Chinese) [岳林海, 水淼, 徐铸德, 郑遗凡 2000 无机化学学报 16 793]
[11] Hu L H, Dai J, Liu W Q, Dai S Y 2009 Acta Phys. Sin. 58 1115 (in Chinese) [胡林华, 戴俊, 刘伟庆, 王孔嘉, 戴松元 2009 58 1115]
[12] Chen Z J, Wang W, Cai Q, Chen X, Wu Z H, Li R P, Chen C Q, Pan W 2008 Acta Phys. Sin. 57 5793 (in Chinese) [陈中军, 王维, 蔡泉, 陈兴, 吴忠华, 李蓉萍, 车传强, 潘伟 2008 57 5793]
[13] Li X J, Qu Y D, Sun G L, Jiang D A, Ouyang X 2007 J. Phys. Chem. Solids 68 2405
[14] Chen Q, Ma F, Yun S R, Huang F L 1999 Chinese J. Mater Res. 13 317 (in Chinese) [陈权, 马峰, 恽寿榕, 黄风雷 1999 材料研究学报 13 317]
[15] Qu Y D, Li X J, Wang X H, Liu D H 2007 Nanotechnology 18 205602
[16] Qu Y D, Li X J, Liu Y 2010 Chinese J. High Pressure Phys. 24 438 (in Chinese) [曲艳东, 李晓杰, 刘元 2010 高压 24 438]
[17] Zhang K, Zhang L Q 2011 Superhard Materials Engineering 23 22(in Chinese) [张凯, 张路青 2011 超硬材料工程 23 22]
[18] Qu Y D 2008 Ph. D. Dissertation (Dalian: Dalian University of Technology) (in Chinese) [曲艳东博士学位论文(大连: 大连理工大学)2007].
[19] Qu Y D, Li X J, Yan H, Ouyang X 2008 Glass Phys. Chem. 34 637
[20] Gribb A A, Banfield J F 1997 Am. Mineral 82 717
[21] Qu Y D, Li X J, Li R Y, Yan H H, Ouyang X, Wang X H 2008 Mater Res. Bull. 43 97
[22] Hu L H, Dai S Y, Wang K J 2003 Acta Phys. Sin. 52 2135 (in Chinese) [胡林华, 戴松元, 王孔嘉 2003 52 2135]
[23] Qu Y D, Li X J, Zhang Y J, Sun G L, Wang X H 2006 J. Functional Materials 37 1838 (in Chinese) [曲艳东, 李晓杰, 张越举, 孙贵磊, 王小红 2006 功能材料 37 1838]
[24] Li W, Ni C, Lin H, Huang C P, S Ismat Shaha 2004 J. Appl. Phys. 96 6663
[25] Zhang H Z, Banfield J F 2000 J. Phys. Chem. B 104 3481
[26] Puri P, Yang V 2007 J. Phys. Chem. C 111 11776
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