Terahertz sensing of chlorpyrifos-methyl using metamaterials

Wendao Xu; Lijuan Xie; Jianfei Zhu; Wei Wang; Zunzhong Ye; Yungui Ma; Chao-Yin Tsai; Suming Chen; Yibin Ying

doi:10.1016/j.foodchem.2016.09.032

Terahertz sensing of chlorpyrifos-methyl using metamaterials

Food Chem. 2017 Mar 1:218:330-334. doi: 10.1016/j.foodchem.2016.09.032. Epub 2016 Sep 7.

Authors

Wendao Xu¹, Lijuan Xie², Jianfei Zhu³, Wei Wang⁴, Zunzhong Ye⁵, Yungui Ma⁶, Chao-Yin Tsai⁷, Suming Chen⁸, Yibin Ying⁹

Affiliations

¹ College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: xuwonder@zju.edu.cn.
² College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: ljxie@zju.edu.cn.
³ State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: zhujianfei@zju.edu.cn.
⁴ Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address: ww_hust@qq.com.
⁵ College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: zzye@zju.edu.cn.
⁶ State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: yingyb@zju.edu.cn.
⁷ Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan, ROC. Electronic address: chaoyin01@gmail.com.
⁸ Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan, ROC. Electronic address: schen@ntu.edu.tw.
⁹ College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Rd., 310058 Hangzhou, PR China. Electronic address: yingyb@zju.edu.cn.

PMID: 27719917
DOI: 10.1016/j.foodchem.2016.09.032

Abstract

By squeezing electromagnetic energy into small volumes near a metal-dielectric interface, plasmonics provide many routes to enhance and manipulate light-matter interactions, which presents new strategies for signal enhancing technologies. As an extension of the ideas of plasmonics to the terahertz (THz) range, metamaterials have shown great potential in sensing applications. In this study, terahertz time-domain spectroscopy (THz-TDS) combined with metamaterials was used to detect chlorpyrifos-methyl (CM), which is one type of the broad-spectrum organophosphorus pesticides. The results demonstrate that sensitivity is greatly improved using THz metamaterials, with the limit of detection (LOD) of CM reaching 0.204mgL^-1, which is lower than the World Health Organization's provisional guideline limit for CM in vegetables (1mgL^-1). The results indicated that THz spectroscopy combined with metamaterials could be a valuable method for highly sensitive THz applications, presenting a new strategy for food quality and safety control in the future.

Keywords: Chlorpyrifos-methyl; Chlorpyrifos-methyl (PubChem CID: 21803); Frequency shift; Metamaterials; Signal-enhancing; Terahertz.

MeSH terms

Chlorpyrifos / analogs & derivatives*
Chlorpyrifos / analysis
Food Analysis
Food Contamination / analysis
Limit of Detection
Organophosphorus Compounds / analysis
Pesticides / analysis*
Terahertz Spectroscopy*
Vegetables / chemistry

Substances

Organophosphorus Compounds
Pesticides
Chlorpyrifos
chlorpyrifos-methyl