The deployment of an NOTT-300 (Al) MOF thin film as a NO2 capacitive sensor under ambient conditions†

Abstract

Herein we report on the fabrication of a metal–organic framework (MOF)-based sensor using an NOTT-300 (Al) MOF thin film, deposited as a sensing layer on an interdigitated capacitive electrode (IDE), and deploy it for the detection of nitrogen dioxide (NO₂) at room temperature. The fabricated MOF-based sensor was tested and it demonstrated a significant detection sensitivity for NO₂ with concentrations down to 250 ppb, with a lower detection limit around 4.0 ppb. The NOTT-300 (Al) MOF sensor also displayed an outstanding NO₂ sensing stability and a highly desirable detection selectivity towards NO₂vs. other common gases such CO₂ and H₂O as well.