介绍了大面积有序反蛋白石结构介孔二氧化钛薄膜光子晶体制备与性能研究的进展.为了保证二氧化钛骨架结构的稳定性和有序度,从而使氧化钛介孔薄膜达到大面积结构均匀,在介孔薄膜制备过程中采用了几种新的工艺方法,其中包括二氧化硅晶体模板的应用和用NaOH溶液代替常用的HF溶液作为模板去除剂.制备的介孔二氧化钛薄膜光子晶体的面积达到厘米尺寸,二氧化钛骨架的填充率达到17.4%,薄膜制备过程中的收缩率<3%.薄膜透射光谱研究结果表明,这种大面积3D有序的反蛋白石结构介孔二氧化钛薄膜具有非常优良的光子带隙特性,有望成为一类具有非常好的发展和应用前景的光子晶体材料.
The recent advances of the authors’ study on the synthesis of large-area 3D ordered macroporous titania film photonic crystals by using silica colloidal crystals as
templates were presented. The main procedure of the preparation was described as follows. Firstly, the silica colloidal crystal template was deposited
onto a glass micro slide through a convective assembly process in which monodispersive silica spheres of 309nm were used. Secondly, after sintered at
600℃ for 1h the crystalline template was immersed vertically into a TiO2 sol for the infiltration of the template. Thirdly, the
resulting titania-opal composite film was immersed in an aqueous NaOH solution for 24h to remove the silica template. By means of the systematical
study of the processes and application of some innovative processing techniques such as silica colloidal crystal templating technique, alkali based
template-etching technique, the highly ordered macroporous TiO2 film photonic crystals with sizes of centimeters were successfully fabricated.
The results show that the shrinkage of the macroporous framework with a filling rate of 17.4% is less than 3%. The XRD pattern shows that the porous framework consists
of nanocrystallites of anatase mixed with a magnéli phase (Ti5O9). The optical property measurements of the films indicate that the
film photonic crystal has strong photonic bandgap behavior.
参考文献
| [1] | Yablonovitch E. Phys. Rev. Lett., 1987, 58: 20059. [2] Kuai Sulan, Zhang Yuzhi, Hu Xingfang. J. Inorg. Mater., 2001, 16 (2): 193-199. [3] Kuai Sulan, Zhang Yuzhi, Troung Vo-Van, Hu Xingfang. Applied Physics A, 2002, 74: 89-90. [4] Kuai Sulan, Badilescu Simona, Bader Geoges, et al. Adv. Mater., 2003, 15 (1): 73-75. [5] Kuai Sulan, Hu Xingfang, Troung Vo-Van. J. Crys. Growth, 2003, 259: 404-410. [6] Kuai Sulan, Hu Xingfang, Troung Vo-Van. Journal of Crystal Growth, 2004, 276: 317-324. |
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