挥发性有机物的非接触SERS检测

Non-contact SERS Detection of Volatile Organic Compounds

挥发性有机物在自然环境中普遍存在,对人体健康造成显著影响,为此亟待发展高灵敏度的快速识别和检测技术。本文通过制备和优化表面增强拉曼散射(surface-enhanced Raman scattering,SERS)基底,实现了强吸附和弱吸附型挥发性有机物的检测。首先利用化学方法合成了粒径约为30nm的均匀准球形金纳米粒子,该粒子具有SERS效应以及良好的化学稳定性,以该纳米粒子为单元,通过气液两相界面自组装技术制备增强性能好、SERS信号均匀的金纳米粒子单层膜(Au MLF),并以此为SERS基底对挥发性有机物苯硫酚进行了检测。为了实现弱吸附挥发物质的检测,对Au MLF表面进行了修饰,构建了聚二甲基硅氧烷(PDMS)-Au MLF复合基底,实现了苯及二甲苯等弱吸附型挥发性有机物的检测。

Volatile organic compounds(VOC),as a general species in the natural environment,produced significant impact on human health.Therefore,the rapid technique for the in situ detection on VOC is high desired.In this study,the uniform 30 nm spherical Au nanoparticles were synthesized by chemical method,which had surface-enhanced Raman effect and high chemical stability.Using the nanoparticles as a unit,an Au nanoparticles monolayer film(Au MLF)with remarkable enhancement and good SERS signal uniformity was assembled at the air/water interface.Using the Au MLF as a SERS substrate,the volatile organic compound has been detected.And then,to realize the SERS detection of volatile organic compound with weak adsorption on substrate,we fabricated the polydimethylsiloxane(PDMS)coated Au MLF composite substrate(PDMS-Au MLF)to improve the SERS detection ability.Using this non-contact detection method,we can realize SERS detection of various VOCs.