摘要：In this work,a distinctive hierarchical tree-like rutile TiO2 architecture growing directly on the conductive surface of indium tin oxide(ITO)conductive glass substrates was successfully prepared via a facile one-step hydrothermal process,where titanium butoxide used as Ti source and HCl as an acidic medium solution.The as-obtained products were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM),selected area electron diffraction(SAED)and applied in gas sensor.The characterization of FE-SEM indicates that the morphology of the products can be controlled by regulating solution acidity,the amount of titanium butoxide,reaction time,addition agents,and so on.The gas sensing test shows that the sensor fabricated with 3D nanotree-like rutile TiO2 has higher gas response towards CH3 COCH3 gas than those with 1 D rod-like TiO2 or common TiO2 precipitate,indicating that the 3D nanotree-like architectures may be promising gas sensitive materials.

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