二钛酸钾纳米薄膜的原位合成及其性能研究  

In situ synthesis and performances of potassium dititanate nanofilm

作　　者：钱清华[1,2] 刘畅[1] 冯新[1] 陆小华[1] 

机构地区：[1]南京工业大学化学化工学院,南京210009 [2]连云港职业技术学院,江苏连云港222006

出　　处：《材料科学与工艺》2009年第5期707-712,共6页Materials Science and Technology

基　　金：海外合作基金项目(20428606);国家自然科学基金(20246002)项目;国家重点基础研究发展计划资助项目(2003CB615700);国家高科技研究与发展项目(2003CB615700);江苏省重点科学基金(BK2004215);中石油技术开发项目(W06-03C-01-03-02)

摘　　要：以Ti(n-OC4H9)4和CH3COOK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K2Ti2O5纳米薄膜;采用TG-DSC,XRD,Raman光谱和AFM研究了K2Ti2O5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K2Ti2O5晶核,在414℃～600℃的结晶阶段制得K2Ti2O5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,K2Ti2O5薄膜能很有效的降解OTS(C18H37SiCl3)单分子膜(SAMs),光催化活性比溶胶-凝胶法制备的TiO2薄膜高,光激发和光电响应能力也比TiO2薄膜强.A potassium dititanate film nano produced in situ with high photocatalytic activity was prepared by solgel method using Ti（n- OC4H9）4and CH3COOK 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 ℃. K2Ti2O5 nuclei are formed in the solid - state reaction stage at 414 ℃. The uniform compact and transparent. K2Ti2O5 nanofilm is obtained in the crystallization stage at 414 ℃ - 600 ℃. The surfaces of K2Ti2O5 particles of films are very smooth, and the crystal growth is in a preferred orientation along a crystal face of K2Ti2O5. The K2Ti2O5 film can efficiently decompose the alkylsiloxane monolayers under UV irradiation in air, the photo -catalytic activity of K2Ti2O5 film is higher than that of TiO2 film prepared by solgel method, and K2Ti2O5 film has strong photo -excitation and photo - response.

关 键 词：二钛酸钾薄膜 原子力显微镜 溶胶-凝胶 晶体生长 

分 类 号：O643[理学—物理化学]