铝包覆纳米二氧化钛的制备及其形态研究

Study on Preparation and Morphology of Aluminum-coated Titanium Dioxide

摘要:

纳米二氧化钛是太阳能光电转化过程中普遍使用的材料,已有研究证明对其进行铝包覆可以很好地提高其光电性能。为了方便根据铝元素形态确定包铝改性过程中铝的添加量,以及分析铝元素各形态对改性纳米二氧化钛功能的改进作用,通过硫酸铝对纳米二氧化钛进行表面无机改性,并采用X射线衍射仪、红外光谱仪、热重分析仪和自带能谱的扫描电镜等手段对改性前后的纳米二氧化钛进行表征来确定包铝后的纳米二氧化钛中的铝元素形态。实验结果表明:经铝改性后的纳米二氧化钛表面包覆物以AlOOH和无定型Al(OH)3的形式存在,且AlOOH、Al(OH)3、TiO2三者的个数比近似为1∶1.5∶7.5,表面包覆物以Al(OH)3为主。

Abstract:

Nano-titanium dioxide(nano-TiO2) is the mostly common material for photovoltaic solar energy conversion. Surface modification can improve the photoelectric properties of nano-TiO2. In order to determine the addition of aluminum according to the aluminum elemental morphology, and the effect on nano-TiO2 of every aluminum elemental morphology. The inorganic surface of nano-TiO2 was coated by aluminum, and the properties of titanium dioxide were characterized by X-ray diffraction(XRD), infrared spectroscopy, thermogravimetric analyzer and scanning electron microscopy(SEM), to make sure the aluminum morphology of modified nano-TiO2. The experiment showed that the surface coating of nanometer titanium dioxide modified by aluminum is in the form of AlOOH and amorphous Al(OH)3, and the number of AlOOH, Al(OH)3 and TiO2 is about 1∶1.5∶7.5, coated with Al(OH)3 mainly.