利用太赫兹光谱和氧化石墨烯传感器实现对芒果皮上农药残留的高灵敏度检测
DOI:
https://doi.org/10.18686/zhfnc.v1i2.67关键词:
太赫兹光谱学；农药监测；等离子体传感器；农作物；衰减全反射摘要
在农业农田中定期监测农药是防止有毒农药化学品滥用的关键。由于通常需要分解农作物样本以提取农药残留物以进行色谱分析，因此寻找非破坏性的农药监测技术对于防止不必要的农作物破坏至关重要。然而，这需要具备能够检测微量农药的分析技术。在本篇文章中，我们展示了太赫兹（THz）光谱在衰减全反射模式下与低成本的氧化石墨烯（GO）等离子传感器相结合，可用于对芒果皮上的农药进行敏感、快速且非破坏性的检测。在将农药溶液涂抹在芒果皮上后，通过将其与芒果皮表面接触并施加压力，将干燥的农药残留物转移到了氧化石墨烯传感器上。由于农药分子吸附到富含氧的氧化石墨烯表面上，因此获得了在太赫兹范围内对应于农药化学指纹的信号。借助这种技术，可以检测到芒果皮上约1 µg/cm2的农药表面浓度。
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