钛酸钾一维纳米结构的构筑及表征  

Construction and Characterization of One Dimensional Nanostructured Potassium Titanate

作　　者：彭裕聪[1] 邓文礼[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《材料科学与工程学报》2009年第5期719-723,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金重点资助项目(2009CB010600);广东自然科学基金资助项目(8151064101000111)

摘　　要：以锐钛矿TiO2为起始原料,通过水热法制备了钛酸钾纳米管/棒,研究了在不同时间内合成不同长度和宽度的钛酸钾纳米管/棒的机理和形态的控制条件。用X射线衍射(XRD)和扫描电子显微镜(SEM)对其结构和形貌进行了表征。实验结果表明水热处理时间对产物形貌的控制有重要影响。处理温度在200℃下,不同的反应阶段得到钛酸钾不规则块状体、纳米管、纳米棒等结构。发现水热处理时间能对钛酸钾特定结构进行有效的控制,确定了水热处理时间和钛酸钾形貌结构的关系,从而可以通过选择反应的合理处理时间和温度,得到特定的钛酸钾纳米结构。此外还对比研究了后处理中加入酸处理时对产物的形貌和晶体结构的影响,发现酸处理过程中H+可取代K+,使得原来的单斜晶体K2Ti6O13转变为H2Ti3O7,从而让纳米棒表面更规整光滑。最后采用紫外-可见吸收光谱对比研究了各个阶段产物的光吸收性能。Potassium titanate nanotubes and nanoribbons have been synthesized via the controllable solvent thermal method by using anatase TiO2 as the starting material.The control conditions of synthesize titanate nanoribbons with different lengths and widths were studied.The phase structures and morphologies were measured by X-ray diffractometry（XRD） and scanning electron microscopy（SEM）. It has been found that the hydrothermal treatment duration has a great effect on the morphologies of the resultant products.Treated at 200℃,potassium titanate nanotubes with an outer diameter of about several nanometers and nanoribbons with widths ranging from 50 to 500 nm and lengths up to several microns were produced at different treatment durations,thus we can select synthetic conditions to synthesize specific titanate nanostructures we want.Effects of hydrothermal post-treatment on the microstructures and morphologies of potassium titanate were investigated by comparative experiments.Experimental results showed that the K^＋ ions in potassium titanate were replace by H^＋ ions,monoclinic K2Ti6O13 transformed into H2Ti3O7,and the morphologies were improved.UV-visible spectra were obtained for the starting material and the resultant products.

关 键 词：钛酸钾 水热法 处理时间 酸洗 

分 类 号：O649[理学—物理化学] O643[理学—化学]