尽管薄膜技术(DGT)中的扩散梯度在环境分析中受到高度重视,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,我们报告了一种表面增强拉曼散射(SERS)响应DGT传感设备(SERS-DGT传感器),能够现场确定水下有机污染物。这是通过创新性地利用负载在氧化石墨烯(AuNPs@GO)上的Au纳米颗粒的SERS响应液体悬浮液作为DGT结合相来实现的。液体悬浮液是通过组合的二次生长和分子焊接方法合成的,并用作DGT结合阶段AuNPs@GO表现出良好的SERS活性,水稳定性,和吸附性能。基于24-144小时的开发时间范围,SERS-DGT传感器对磺胺嘧啶(SMT)的测量在0.3289-2631ngmL-1的浓度范围内进行评估。SERS-DGT采样器适用于在各种环境条件下测量SMT(i。e,pH5-9,离子强度0.0001-0.05molL-1NaCl,DOM浓度0-100mgL-1,TC:SMT≤20和MNZ:SMT≤20的值)。SERS-DGT传感器应用于生猪养殖废水中SMT含量的实际测试,并与抓取抽样方法进行了比较,结果证实,这种新的连字符技术具有良好的准确性和精密度。通过将该方法扩展到罗丹明6G的监测,该平台被证明是通用的,甲硝唑,氟西汀,和恩诺沙星.在这篇文章中,SERS-DGT传感器,用于直接现场感测有机DGT的平台,对于各种有机物的原位采样和现场传感具有巨大的潜力,并为环境监测提供了新思路。
Although diffusion gradient in the thin-film technique (DGT) is highly regarded in environmental analysis, the traditional DGT devices cannot serve as sensing devices but in situ sampling devices. Here we report a surface enhanced Raman scattering (SERS) responsive DGT sensing device (SERS-DGT Sensor) capable of on-site determination of organic contaminants underwater. This is achieved by innovatively utilizing a SERS responsive liquid suspension of Au nanoparticles supported on graphene oxide (AuNPs@GO) as the DGT binding phase. Liquid suspension is synthesized via a combined secondary growth and molecular welding approach and used as DGT binding phase AuNPs@GO exhibit good SERS activity, aqueous stability, and adsorption performance. Based on the development time range of 24-144 h, the measurement of sulfadiazine (SMT) by SERS-DGT Sensor is evaluated in the concentration range of 0.3289-2631 ng mL-1. The SERS-DGT sampler is valid for measuring SMT under a wide range of environmental conditions (i.e, pH 5-9, ionic strength 0.0001-0.05 mol L-1 NaCl, DOM concentrations 0-100 mg L-1, the values of TC: SMT ≤ 20 and MNZ: SMT ≤ 20). SERS-DGT Sensor is applied to the practical test of SMT content in pig breeding wastewater, and compared with the grab sampling method, the results confirm that this novel hyphenated technique exhibits good accuracy and precision. The platform proves to be versatile by extending the method to the monitoring of rhodamine 6G, metronidazole, fluoxetine, and enrofloxacin. In this article, SERS-DGT Sensor, a platform for directly on-site sensing of organic DGT, holds great potential for in situ sampling and on-site sensing for a wide range of organics and provides a new idea for environmental monitoring.