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TiO2 Nanorod-Derived Synthesis of Upstanding Hexagonal Kassite Nanosheet Arrays: An Intermediate Route to Novel Nanoporous TiO2 Nanosheet Arrays

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journal contribution
posted on 04.01.2012 by Xiaoyan Gan, Xiangdong Gao, Jijun Qiu, Peng He, Xiaomin Li, Xiudi Xiao
In this report, upstanding and nanoporous hexagonal TiO2 nanosheet arrays were achieved via using kassite [CaTi2O4(OH)2] as an intermediate. The process developed involved a TiO2 nanorod-derived synthesis of upstanding hexagonal kassite nanosheet arrays and a transformation of the kassite to TiO2. To the best of our knowledge, this is the first successful attempt to grow ordered hexagonal kassite nanosheet arrays. The as-obtained kassite nanosheets showed a single-crystalline nature with their c-axis parallel to the substrate. A stepwise study of the growth of the interesting hexagonal kassite nanosheet arrays was demonstrated. Upon hydrothermal treatment with diluted HNO3 aqueous solution, the single-crystalline hexagonal kassite got converted to nanoporous rutile TiO2, with shape preservation. The approach described in this study provides a novel method for the synthesis of kassite and TiO2 nanosheet arrays and are ready for a variety of applications such as in catalytic or optoelectronic fields.