ACS Nano. 2014 Jul 22;8(7):7272-8. doi: 10.1021/nn502336x.
Smart material nanoassemblies that can simultaneously sense and shoot low-level contaminants from air and water are important for overcoming the threat of hazardous chemicals. Graphene oxide (GO) sheets deposited on mesoscopic TiO2 films that underpin the deposition of Ag nanoparticles with UV irradiation provide the foundation for the design of a smart material. The Ag particle size is readily controlled through precursor concentration and UV irradiation time. These semiconductor–graphene oxide–metal (SGM) films are SERS-active and hence capable of sensing aromatic contaminants such as 4-nitrobenzenethiol (4-NBT) in nanomolar range. Increased local concentration of organic molecules achieved through interaction with 2-D carbon support (GO) facilitates low-level detection of contaminants. Upon UV irradiation of 4-NBT-loaded SGM film, one can induce photocatalytic transformations. Thus, each component of the SGM film plays a pivotal role in aiding the detection and degradation of a contaminant dispersed in aqueous solutions. The advantage of using SGM films as multipurpose “detect and destroy” systems for nitroaromatic molecules is discussed.
能够同时感测和从空气和水中喷射出低浓度污染物的智能材料纳米组装体对于克服危险化学品的威胁非常重要。在支撑 Ag 纳米粒子沉积的介观 TiO2 薄膜上沉积的氧化石墨烯 (GO) 薄片为智能材料的设计提供了基础。Ag 颗粒尺寸可以通过前体浓度和 UV 照射时间来轻松控制。这些半导体-氧化石墨烯-金属 (SGM) 薄膜具有表面增强拉曼散射 (SERS) 活性，因此能够感测到纳米摩尔范围内的芳香族污染物，如 4-硝基苯硫醇 (4-NBT)。通过与二维碳载体 (GO) 的相互作用实现的有机分子局部浓度的增加有助于低水平污染物的检测。在负载有 4-NBT 的 SGM 薄膜的 UV 照射下，可以诱导光催化转化。因此，SGM 薄膜的每个组件都在帮助检测和降解分散在水溶液中的污染物方面发挥着关键作用。讨论了将 SGM 薄膜用作多用途“检测和破坏”硝基芳烃分子系统的优势。
