镍离子掺杂TiO2涂层的制备及亲水性研究

目的 研究不同含量的镍离子掺杂对TiO2纳米涂层亲水性能的影响.方法 采用溶胶-凝胶法制备不同含量Ni2+掺杂TiO2纳米复合溶胶,通过浸渍提拉法在载玻片上成膜,经过热处理后,得到不同含量Ni2+掺杂TiO2复合涂层.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外-可见光分光光度计(UV-Vis)、傅里叶变换红外光谱仪(FT-IR)和表面接触角仪,对掺杂不同浓度Ni2+后TiO2的晶型、涂层微观形貌、光吸收性能、结构组成和涂层亲水性等进行表征分析,从而确定最佳Ni2+浓度的复合涂层材料配方.结果 制备的TiO2主要由锐钛矿相和少量金红石相组成,Ni掺杂抑制了锐钛矿相向金红石相的转变.随着Ni含量的增加,TiO2晶粒尺寸逐渐降低.适量掺杂Ni2+制备的TiO2纳米涂层表面形貌光滑,粒子分布致密均匀.掺杂使吸收波长阈值向长波方向偏移,禁带宽度减小,在一定程度上提高了TiO2涂层的亲水性.当Ni2+掺杂质量分数为1.5％时,TiO2涂层亲水性最佳.结论 采用溶胶-凝胶法实现了镍离子掺杂TiO2的改性,掺杂Ni2+后,Ni2+/TiO2复合涂层的亲水性能明显提高.

Preparation and Hydrophilicity of Nickel Ion Doped TiO2 Coatings

The work aims to study the effects of different contents of Ni2+ on the hydrophilicity of TiO2 nono-coating. Different contents of metal ion Ni2+ doped TiO2 nanocomposite sols were prepared by sol-gel method, and different contents of Ni2+ doped TiO2 composite coatings were obtained by dip-coating method and heat treatment to form coating on the glass slide. The TiO2 doped with different concentration of Ni2+ was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet-visible spectrophotometer (UV-Vis), Fourier transform infrared spectrometer (FT-IR) and surface contact angle meter, and the crystal form, coating morphology, light absorption properties, structural composition and hydrophilicity were analyzed, and thereby the best composite coating formulation with appropriate content of metal ion Ni2+ was determined. The results showed that TiO2 consisted of anatase phase and a small amount of rutile phase, the doping of Ni inhibited the transition from anatase phase to rutile phase. The grain size gradually reduced with the increase of Ni content. The surface morphology of nano TiO2 coating with appropriate doping of Ni2+ was smooth and the particle distribution was dense and uniform. The doping could make the absorption wavelength threshold shift towards long wave and reduce the band gap, and effectively improve the hydrophilicity of TiO2 coating to a certain extent. When the mass fraction of Ni2+ was 1.5%, the hydrophilicity of TiO2 coating was the best. The modification of nickel ion doped TiO2 is achieved by sol-gel method. After doped into Ni2+, the hydrophilicity of Ni2+/TiO2 composite coating is significantly improved.