Chia-Hsu Hsieh, Yi-Chan Yeh, Le-Quyen Ly, Guan-Jie Su, Shao-En Tsai, Yu-Hua Ye, Yu-Cheng Lin, I. Huang
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Extended-gate field-effect transistor-based pesticide microsensor for the detection of organophosphorus and carbamate
Abstract. Using microelectromechanical systems technology, a high-performance extended-gate field-effect transistor (EGFET)-based pesticide microsensor for organophosphorus and carbamate (CM) detection is developed. To minimize the whole pesticide-sensing system, we also integrated a planar Ti/Ag/AgCl/KCl-gel microreference electrode into the same silicon chip. The total dimensions of the proposed pesticide-sensing system are only 0.92 × 0.95 × 0.1 cm3. This EGFET-based microsensor for organophosphorus and CMs demonstrates extremely high sensitivity (194 and 268.1 mV/dec, respectively) and sensing linearity (0.993 and 0.974, respectively) and extremely low response time (120 and 300 s, respectively). The microsensor detection limit for both pesticides is 0.001 ppm.
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