A novel electrochemical ammonia sensor based on Pt NPs@MIL101(Cr)-NH2 for chemical leaks detection at room temperature

Achieving the real-time, low-cost, portable and accurate NH 3 detection is of great importance in industry owing to the toxicity of NH 3 . In this paper, Pt NPs@MIL-101-NH 2 composites modified screen-printed electrodes (SPEs) were prepared by solvothermal method and ionic liquids [BMIM][BF 4 ] were used as electrolytes. Finally, the prepared Pt NPs@MIL-101-NH 2 /SPEs were combined with a miniature electrochemical workstation to construct a novel electrochemical NH 3 sensor. The experimental results showed that Pt NPs@MIL-101-NH 2 has excellent adsorption capacity for NH 3 , and the sensor has good linearity in the range of 0.7–600 ppm with low limit of detection (0.58 ppm) and fast response time for 10 ppm NH 3 (8.0 s). Furthermore, this sensor also possesses excellent stability, reproducibility, anti-interference and accuracy. The synthesized Pt NPs@MIL-101-NH 2 nanocomposite was proved to be an excellent candidate for constructing high-performance NH 3 sensor for industry.