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采用溶胶-凝胶法合成TiO2纳米粉,并分别在500、600和700℃进行煅烧。并以此为前驱物,采用微波水热合成法制备TiO2纳米管。用X射线衍射(XRD)、场发射扫描电镜(FESEM)和场发射透射电镜(FETEM)分别对TiO2纳米粉和纳米管进行表征。结果显示,煅烧温度影响TiO2纳米粉晶粒尺寸,微波水热合成法对TiO2纳米管的晶型和结晶度的影响明显。同时研究TiO2纳米管的晶型和结晶度的变化机制,结果表明,以600和700℃煅烧的TiO2纳米粉为前驱物经微波水热合成法合成的TiO2纳米管中部分热力学亚稳态的锐钛矿向稳定态的金红石进行转变。
TiO2 nanoparticles were synthesized by sol-gel method and calcined at 500, 600 and 700 ℃, respectively. And as a precursor, using microwave hydrothermal synthesis of TiO2 nanotubes. The TiO2nanopowder and nanotube were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and field emissionmethod (FETEM) respectively. The results show that the calcination temperature affects the size of TiO2 nanopowders, and the effect of microwave hydrothermal synthesis on the crystallinity and crystallinity of TiO2 nanotubes is obvious. At the same time, the variation mechanism of the crystal form and crystallinity of TiO2 nanotubes was studied. The results show that the partially thermodynamically metastable TiO2 nanotubes synthesized by microwave hydrothermal synthesis at 600 and 700 ℃ are the precursors of TiO2 nanotubes. Titanium to the steady state of rutile transformation.