TiO2/石墨烯/Ag复合结构SERS实验

摘要

基于氧化物半导体的光催化特性,能够降解有机物分子,使表面增强拉曼散射基底得以重复使用.提出了银纳米颗粒有效修饰覆盖有石墨烯的二氧化钛纳米棒阵列(TiO2/石墨烯/Ag)复合结构作为表面增强拉曼散射基底,并对其进行了实验研究.利用水热法制备了二氧化钛纳米棒阵列;采用湿法转移石墨烯和光照还原方法制备了TiO2/石墨烯/Ag复合结构.用罗丹明6G(R6G)分子作为探测分子,结果表明:随着紫外光照沉积时间增加,探针分子的拉曼信号先增强后减弱;计算得到最大增强因子值约为2.6×106.此外,还对TiO2/石墨烯/Ag复合结构的紫外自清洁特性进行了初步实验,结果表明,紫外光照射20 min后,其拉曼强度下降到42.3％,具有一定的紫外清洁效果.%Based on the photocatalytic properties of oxide semiconductors and the ability to degrade organic molecules,the sur-face-enhanced Raman scattering (SERS)substrates can be reused,a composite structure based on Ag nanoparticles decorated on TiO2 nanorod arrays with graphene (TiO2/graphene/Ag)for surface Raman enhancement is presented.The TiO2 nanorods are synthesized with a hydrothermal method,the TiO2/graphene/Ag composites are fabricated by wet transfer graphene and a pho-toreduction method.Rhodamine 6G serves as the probe analyte.The results indicate that with the increase of UV irradiation time,the Raman signal of probe molecules weakened,the maximum enhancement factor value is calculated to be about 2.6 × 106 .In addition,the UV self-cleaning properties of TiO2/graphene/Ag composite structure have been studied experimentally, the results indicate that after UV irradiation for 20 min,the Raman intensity dropped to 42.3％,which has a certain UV clean-ing effect.