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利用改进的溶胶－凝胶法制备了锐钛矿型二氧化钛的纳米粉末（４～１５ｎｍ），测量了ＴｉＯ_２的漫反射光谱（ＤＲＳ）和光致发光谱（ＰＬ）．结果表明，ＴｉＯ_２纳米微粒的光学禁带宽度为３８４ｎｍ，在２５０～４００ｎｍ的紫外光范围内有强吸收；纳米二氧化钛在波长为４２０，４６１，４８５，５３０，５７３和６０９ｎｍ有强发光带，这些发光带分别为自由激子发光、束缚激子发光以及缺陷能级和表面态引起的发光。
Anatase titanium dioxide nanopowders (4 ~ 15nm) were prepared by the improved sol-gel method. The diffuse reflectance spectra (DRS) and photoluminescence spectra (PL) of TiO_2 were measured. The results show that the optical band gap of TiO_2 nanoparticles is 384nm with strong absorption in the range of 250-400nm. The nano-TiO_2 has strong emission bands at the wavelength of 420,461,485,530,573 and 609nm. With free excitons luminescence, bound exciton luminescence, and defect levels and surface states caused by the light.