超亲水性SiO_2-TiO_2纳米颗粒阵列结构的制备与性能研究  

Preparation and property of super-hydrophilic SiO_2-TiO_2 nano-particle layer

作　　者：马海敏[1] 洪亮[1] 尹伊[1] 许坚[1] 叶辉[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州300127

出　　处：《物理学报》2011年第9期695-701,共7页Acta Physica Sinica

摘　　要：用分子自组装的方法在玻璃衬底上分别制备了TiO2纳米颗粒层和SiO2-TiO2复合纳米颗粒阵列结构.其中,SiO2纳米颗粒层用旋涂法制备,得到密排阵列结构,而TiO2纳米颗粒层则用浸渍提拉法制备.文章分析了TiO2纳米颗粒层和SiO2-TiO2复合纳米颗粒阵列结构的理论粗糙度,并通过扫描电子显微镜研究了它们的微观结构,用接触角测试仪测定了其紫外光照前后的水接触角变化,并结合分光光度计分析和研究了其光催化降解有机物的能力.实验结果表明:在紫外光照射后,TiO2纳米颗粒层和SiO2-TiO2双层颗粒阵列结构均呈现出超亲水性,其接触角接近0°,但避光保存一段时间后,它们的接触角都有所增大,直至到一个较稳定的接触角;SiO2-TiO2复合纳米颗粒阵列结构的亲水性优于纳米TiO2单层;SiO2-TiO2双层颗粒的光催化降解有机物的能力也明显优于TiO2颗粒单层.TiO2 particle single layer and SiO2-TiO2 particle double layers on glass substrate are obtained by self-assembly technique. For SiO2-TiO2 particle double layers, SiO2 Particle layer is made by spin-coating with SiO2 particles closely packed,while TiO2 Particle layer is obtained through layer-by-layer method in both cases of TiO2 particle single layer and SiO2-TiO2 particle double layers, with TiO2 particles non- closely packed. The theoretical roughness of TiO2 particle single layer and SiO2-TiO2 particle double layers are analyzed. Microstructures of these two coatings are studied with scanning electron microscope. Water contact angles before and after exposure to UV light are measured by drop meter separately. Light catalytic ability of organics degradation is determined by spectrophotometer. The experimental results show that the water contact angles of the as-prepared particle films increase if these coatings are stored in dark for days till the contacts become stable, while if exposed to UV light, they become super-hydrophilic with contact angles approaching 0°,that the roughness greatly affects water contact angle, and that the catalytic ability of SiO2-TiO2 particle double layers is superior to TiO2 particle single layer.

关 键 词：自清洁 表面粗糙度 光催化 分子自组装 

分 类 号：TB383.1[一般工业技术—材料科学与工程]