Ag/TiO2多孔阵列作为可再生的SERS活性基底

Ag/TiO2 Nanopore Array for A Recyclable SERS Active Substrates

摘要:

采用三次阳极氧化法制备了TiO₂纳米孔阵列,然后通过连续离子层吸附法在其上负载30 nm左右的Ag纳米颗粒,并将Ag/TiO₂作为SERS活性基底,研究了其对罗丹明6G(R6G)的表面增强拉曼散射(SERS)效应,同时对基底的均匀性、稳定性和可再生性能进行了系统研究。结果显示,在激发波长为532 nm的情况下,该基底对R6G分子的检测限达到~10_-7mol/L,且具有较好的均匀性和稳定性；吸附了R6G分子的Ag/TiO₂基底经模拟太阳光照射后,30 min内即可将所吸附的待测分子降解,显示出良好的可再生性能。基于其高度有序的结构和良好的性能,所制备的Ag/TiO₂多孔孔阵列有望作为一种理想的SERS活性基底而在相关领域获得应用。

Abstract:

_{:TiO2 nanopore array was firstly prepared by three-stepped anodization process, and subsequently Ag nanoparticles with sizes of 30 nm were deposited on TiO2 nanoarray through a continuous ion layer adsorption. The resulting Ag/TiO2 nanopore array was then used as a surface enhanced Raman scattering (SERS) active substrate, and their uniformity, stability and recyclability were investigated. The results showed that the Ag/TiO2 substrates delivered a detection limit of up to ~10-7 mol/L under excitation at 532 nm. Moreover, the substrates exhibited outstanding uniformity and stability. The Ag/TiO2 nanoarray also conducted photocatalysis decomposition of adsorbed R6G molecules after 30 min irradiation under simulated solar light, exhibiting high recyclability. Such a Ag/TiO2 nanopore array has great potential as an ideal SERS active substrate due to its highly ordered structure and excellent properties.}