Fecha de publicación: 01/01/2025 Fuente: Materials Abstract
This work reports the synthesis and characterization of a zinc-based metal–organic framework (Zn-MOF) and its nanocomposite with graphene oxide (GO) for room-temperature ammonia (NH3) sensing. The Zn-MOF/GO nanocomposite was prepared via an innovative solvothermal approach and comprehensively characterized using x-ray diffraction, UV–visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and thermogravimetric analysis. The nanocomposite demonstrated exceptional NH3 sensing performance at ambient conditions, exhibiting a linear response from 20 ppm to 220 ppm, a significant 13.2% response towards 100 ppm NH3, and rapid response/recovery times of 102/127 s. Notably, the sensor maintained long-term stability, with 12.4% average sensitivity over 50 days. The synergistic effects between GO and Zn-MOF components, coupled with the high surface area and porous structure, contributed to the superior sensing characteristics. A strong linear correlation (R2 = 0.9906) between sensor response and NH3 concentration enabled precise quantitative detection. This study not only introduces a novel material for NH3 sensing but also provides crucial insights into the structure–property relationships governing nanocomposite gas sensors. The findings open new avenues for designing high-performance chemiresistive gas sensors operating at ambient conditions, with potential applications in environmental monitoring and industrial safety.