High-sensitivity pesticide detection on mango skin via terahertz spectroscopy with graphene oxide sensor
DOI:
https://doi.org/10.18686/fnc.v1i2.26Keywords:
THz spectroscopy; pesticide monitoring; plasmonic sensors; agricultural crops; attenuated total reflectanceAbstract
Regular monitoring of pesticides in agricultural farmland is essential to prevent the misuse of toxic pesticide chemicals. As crop samples are typically disintegrated to extract the pesticide residue for chromatographic analysis, non-destructive techniques for pesticide monitoring are ideal for preventing the unwanted destruction of crops. This, however, requires analytical techniques that can detect trace pesticide amounts. Here, we show that terahertz (THz) spectroscopy in attenuated total reflection mode, combined with a low-cost graphene oxide (GO) plasmonic sensor, can be used for sensitive, fast, and non-destructive pesticide detection on mango skin. After the application of a pesticide solution onto the mango skin, the dried pesticide residue was transferred to the GO sensor by pressing it in contact with the mango skin surface. Due to the adsorption of the pesticide molecules onto the oxygen-rich GO surface, a signal in the THz range was obtained corresponding to the pesticide’s chemical fingerprint. With this technique, pesticide surface concentrations of as low as 1 µg/cm2 on mango skins can be detected.
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Copyright (c) 2023 Xizu Wang, Reuben J. Yeo, Nan Zhang, Zhen Xiang Xing, Qiang Zhu, Karen Lin Ke
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