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采用一步水热法合成了Cu纳米粒子负载二氧化钛纳米管材料. 利用透射电子显微镜(TEM)、X射线衍射仪(XRD)、能谱仪(EDS)等对材料的相组成、形貌以及形成过程进行了研究. 制得的Cu-TiO2复合纳米材料长度约为100nm, 直径10-15nm, 其上负载的Cu纳米粒子尺寸约为5nm. BET比表面积测试表明实验制备的Cu-TiO2复合纳米管的比表面积为154.67m2·g-1. 通过调节水热反应时间和钛前驱体种类, 研究了该复合纳米管材料的形成机制. 结果表明: 非晶态的钛源对于成功一步合成Cu-TiO2复合纳米管至关重要. 同时, 实验中观察到铜纳米粒子的尺寸随水热反应时间延长而减小(反奥氏陈化过程), 这一现象有助于纳米粒子的可控合成.紫外-可见吸收光谱表明该复合纳米管在350-800nm范围内有较强的吸收, 并在550-600nm范围观察到Cu的表面等离子激元吸收带. Cu-TiO2界面处形成的肖特基势垒有助于加快光生载流子的输运, 提高光生电子-空穴对的分离效率. 光催化实验表明Cu-TiO2复合纳米管在可见光下具有较高的催化活性.
Cu nanoparticle-supported TiO 2 nanotubes were synthesized by one-step hydrothermal method. The phase composition, morphology and formation process of the materials were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) Cu-TiO2 composite nanomaterials prepared with a length of about 100nm, a diameter of 10-15nm, the size of the supported Cu nanoparticles is about 5nm BET specific surface area test shows that the experimental preparation of Cu-TiO2 composite nanotubes The specific surface area was 154.67m2 · g-1. The mechanism of formation of the composite nanotubes was investigated by adjusting the hydrothermal reaction time and the type of titanium precursor. The results show that amorphous titanium source can be successfully used to synthesize Cu- At the same time, it is observed that the size of copper nanoparticles decreases with the increase of hydrothermal reaction time (anti-aging process), which is helpful to the controlled synthesis of nanoparticles.UV- The visible absorption spectra show that the composite nanotube has strong absorption in the range of 350-800nm and the surface plasmon absorption band of Cu is observed in the range of 550-600nm.The Schottky barrier formed at the Cu-TiO2 interface is Help to speed up Transport of photogenerated carriers to improve photo-generated electron - hole pair separation efficiency photocatalytic experiments show that Cu-TiO2 composite nanotubes have a high catalytic activity under visible light.