Abstract：
Although diffusion gradient in thin-film technique (DGT) has realized the in-situ sampling Sulfamethazine (SMT), the traditional DGT devices cannot be served as sensing devices but in-situ sampling devices. Here we report a recyclable surface enhanced Raman scattering (SERS) responsive DGT sensing device (recyclable SERS-DGT Sensing Device) capable of in-situ sensing of SMT in water. This is achieved by innovatively utilizing a recyclable SERS responsive liquid suspension of Au nanoparticles supported on g-C3N4 (Au@g-C3N4NS) as DGT binding phase. Au@g-C3N4NS is synthesized via in-situ growth method and embed in DGT binding phase, which exhibits good SERS activity, aqueous stability recyclable and adsorption performance. The SERS-DGT Sensing Device is valid for measuring SMT under a wide range of conditions (i.e., deployment time 24∼180 h, concentrations range of 1.031∼761.9 ng mL-1, pH 5∼9, ionic strength 0.0001∼0.05 mol L-1 NaCl, DOM concentrations 0∼100 mg L-1, four recycles). Furthermore, substrate combined with DGT binding phase, can integrate the sampling, pretreatment and SERS detection of SMT, which can be recycled, improving the reliability and efficiency of environmental monitoring. In this article, recyclable SERS-DGT Sensing Device, a platform for recyclable in-situ sensing of antibiotics, holds great potential for environmental monitoring.
摘要：
尽管薄膜技术（DGT）中的扩散梯度已经实现了磺胺二甲嘧啶（SMT）的原位采样，传统的DGT设备不能用作传感设备，而是原位采样设备。在这里，我们报告了一种可回收的表面增强拉曼散射（SERS）响应DGT传感设备（可回收的SERS-DGT传感设备），能够原位感测水中的SMT。这是通过创新性地利用负载在g-C3N4(Au@g-C3N4NS)上的Au纳米颗粒的可回收SERS响应液体悬浮液作为DGT结合相来实现的。Au@g-C3N4NS通过原位生长法合成并嵌入DGT结合阶段，表现出良好的SERS活性，水稳定性可回收和吸附性能。SERS-DGT传感设备在广泛的条件下（即，部署时间24-180小时，浓度范围为1.031~761.9ngmL-1，pH为5~9，离子强度为0.0001~0.05molL-1NaCl，DOM浓度0~100mgL-1，四次回收)。此外，底物与DGT结合阶段，可以集成采样，SMT的预处理和SERS检测，可以回收利用，提高环境监测的可靠性和效率。在这篇文章中,可回收SERS-DGT传感装置，一个可回收的抗生素原位传感平台，具有巨大的环境监测潜力。
