Ultrasensitive non-enzymatic pesticide electrochemical sensor based on HKUST-1-derived copper oxide @ mesoporous carbon composite

Electrochemical sensors for monitoring pesticides have attracted great interest recently. Herein, we report a novel strategy to fabricate an ultrasensitive non-enzymatic pesticide sensor based on glass carbon electrode (GCE) modified by copper oxide @ mesoporous carbon (CuOx@mC) composite derived from directly pyrolysing metal-organic framework HKUST-1. The formation of CuOx@mC composite was confirmed by multiple characterization techniques. The CuOx@mC composite showed better electrochemical response towards glyphosate than HKUST-1 did, which may be attributed to its mesoporous structure and improved conductivity after heat treatment. The electrochemical measurements demonstrated that the CuOx@mC/GCE displayed superior sensing performances, giving an ultralow detection limit of 7.69x10(-16) M toward glyphosate over the linear range of 1.0x10(-15) to 1.0x10(-4) M. The sensor also showed good reproducibility, stability and excellent anti-interference ability. Furthermore, the sensor was applied to detect glyphosate in real fruits samples and received satisfactory results and excellent recoveries.