稀碱溶液中水热法制备柔性TiO2纳米须薄膜的生长机制及表征

doi:10.3866/PKU.WHXB201302041

Abstract

Abstract:

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 good potential for practical application.

Key words: TiO₂, Nanowhisker, Thin film, Hydrothermal synthesis, Flexible stainless steel substrate, Photoelectrical property

MSC2000:

O643

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 Phys. -Chim. Sin., 2013, 29(04): 858-866.

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

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

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