Citation: DENG Jie, TAO Jie, WU Tao, TAO Hai-Jun. Growth Mechanism and Characterization of Flexible TiO₂ Nanowhisker Films Hydrothermally Synthesized in Dilute Alkaline Solution[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201302041 shu

Growth Mechanism and Characterization of Flexible TiO₂ Nanowhisker Films Hydrothermally Synthesized in Dilute Alkaline Solution

1.
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

Received Date: 3 September 2012
Available Online: 4 February 2013
Fund Project: 国家自然科学基金(51202112) (51202112) 江苏省科技支撑计划项目(BE2009130) (BE2009130)南京航空航天大学基本科研业务费专项科研项目(NS₂010153)资助 (NS₂010153)

Flexible oriented TiO₂ nanowhisker films with large aspect ratios were hydrothermally prepared in 1 mol·L^-1 NaOH solution from Ti film deposited by magnetron sputtering on a flexible stainless steel substrate. The influence of the Ti film deposition conditions on the resulting TiO₂ nanowhisker films was investigated. We also systematically studied the effects of the hydrothermal parameters on the nanowhisker films and their growth mechanism. The samples were characterized by field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), and high resolution transmission electron microscopy (HRTEM). The results showed that nanowhisker film prepared from Ti film deposited at 600 ° C had stronger adhesion to the substrate compared with that prepared from Ti film deposited at room temperature. The as-prepared TiO₂ nanowhiskers were single crystalline anatase and were the result of transformation of Ti into Na₂Ti₂O₄(OH)₂ and H₂Ti₂O₅·H₂O. The nanowhiskers took shape during the hydrothermal synthesis, preferably oriented parallel to (100) crystal face of Na₂Ti₂O₄(OH)₂, and experienced splitting conversion from nanobelts to nanowire harnesses and nanowires. The formation of vertical nanowhisker films was ascribed to a cooperative effect of the dilute NaOH solution and the higher hydrothermal temperature (220 ° C). The photoelectrochemical properties of the films were investigated in Na₂SO₄ solution, and the results showed that the as-prepared TiO₂ nanowhisker film exhibited better photoelectrochemical properties than those of zero-dimensional nanoparticle films and two-dimensional nanobelt films, indicating a od potential for practical application.
- TiO₂,
- Nanowhisker,
- Thin film,
- Hydrothermal synthesis,
- Flexible stainless steel substrate,
- Photoelectrical property
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Growth Mechanism and Characterization of Flexible TiO2 Nanowhisker Films Hydrothermally Synthesized in Dilute Alkaline Solution

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通讯作者: 陈斌, bchen63@163.com

Growth Mechanism and Characterization of Flexible TiO₂ Nanowhisker Films Hydrothermally Synthesized in Dilute Alkaline Solution