Zhang Yongjun, Zhu Aonan, Wang Yaxin, Zhang Xiaolong
School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China.
College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
Nanotechnology. 2021 Mar 26;32(13):135301. doi: 10.1088/1361-6528/abd279.
Excessive thiram residues in food have the potential to negatively impact human health. Hence, the development of a convenient and fast detection method is highly desirable. In this study, an efficient, repeatable, and sensitive surface-enhanced Raman scattering (SERS) active chip was manufactured via a low-cost colloidal lithography technique. The plasmonic structure was composed of a series of silver nanospheres and nanowires. Interestingly, this type structure creates a nanocavity space with a characteristic geometry generating a strong electromagnetic field coupling. The finite-different time-domain software was employed to simulate the electromagnetic field distribute on the nanocavity. Accordingly, SERS active chip that displays ultra-low concentration detection of thiram (10 M) was realized. Moreover, the excellent reproducibility of thiram (10 M) practical detection on an apple pericarp has great potential for application in food safety.
食品中过量的福美双残留有可能对人体健康产生负面影响。因此，非常需要开发一种便捷快速的检测方法。在本研究中，通过低成本的胶体光刻技术制造了一种高效、可重复且灵敏的表面增强拉曼散射（SERS）活性芯片。等离子体结构由一系列银纳米球和纳米线组成。有趣的是，这种类型的结构创建了一个具有特征几何形状的纳米腔空间，产生强烈的电磁场耦合。采用时域有限差分软件模拟纳米腔上的电磁场分布。据此，实现了对福美双（10 M）的超低浓度检测的SERS活性芯片。此外，福美双（10 M）在苹果果皮上实际检测的优异重现性在食品安全应用方面具有巨大潜力。
