以Ti(n-OC_4H_9)_4和CH_3COOK为前驱体,采用溶胶-凝胶法在较低温度下原位合成了高光催化活性的K_2Ti_2O_5纳米薄膜;采用TG-DSC,XRD,Raman光谱和AFM研究了K_2Ti_2O_5薄膜的晶体生长过程;采用电化学方法测量了薄膜的光电响应.结果表明:原料在约259℃发生反应,在低于414℃的固态反应阶段生成K_2Ti_2O_5晶核,在414℃～600℃的结晶阶段制得K_2Ti_2O_5纳米薄膜,薄膜的颗粒表面非常平整,薄膜的晶粒是沿着一个晶面取向生长;薄膜均匀、致密、透明;在空气中紫外光照时,K_2Ti_2O_5薄膜能很有效的降解OTS(C_(18)H_(37)SiCl_3)单分子膜(SAMs),光催化活性比溶胶-凝胶法制备的TiO_2薄膜高,光激发和光电响应能力也比TiO_2薄膜强.
A potassium dititanate film nano produced in situ with high photocatalytic activity was prepared by sol - gel method using Ti(n -0C_4H_9)_4 and CH_3COOK as precursors at lower temperature. The process of crystal growth of potassium dititanate film was investigated by TG - DSC, XRD, Raman spectrum and atomic force microscopy (AFM). The photoelectrochemical response of the film was determined by electrochemical method. It is shown that the starting reaction temperature is 259 ℃. K_2Ti_2O_5 nuclei are formed in the solid -state reaction stage at 414 ℃. The uniform compact and transparent. K_2Ti_2O_5 nanofilm is obtained in the crystallization stage at 414 ℃～ 600℃. The surfaces of K_2Ti_2O_5 particles of films are very smooth, and the crystal growth is in a preferred orientation along a crystal face of K_2Ti_2O_5. The K_2Ti_2O_5 film can efficiently decompose the alkylsiloxane monolayers under UV irradiation in air, the photo - catalytic activity of K_2Ti_2O_5 film is higher than that of TiO_2 film prepared by solgel method, and K_2Ti_2O_5 film has strong photo -excitation and photo -response.
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