Au Modified Hollow Cube Sn‐MOF Derivatives for Highly Sensitive, Great Selective, and Stable Detection of n‐Butanol at Room Temperature

Abstract

At present, there are still few gas sensors for detecting n‐butanol at room temperature. It is worth noting that detecting target gas at room temperature is beneficial to reduce energy consumption and prolong the lifetime of sensors. In this work, different molar ratios Au nanoparticles modified SnO2 derived from Sn‐MOF hollow cubes (Au‐SnO2) are synthesized by the coprecipitation method. The Au‐SnO2 has higher specific surface area than pure SnO2, which is conducive to improving gas sensing. The 0.7% Au‐SnO2 exhibit excellent sensing performances of 240% toward 100 ppm n‐butanol and the actual detection interval is 200 ppb–500 ppm under the room temperature. Meanwhile, DFT calculations reveal that Au‐SnO2 gas sensor has wonderful selectivity to n‐butanol at room temperature. The enhancement of n‐butanol sensing performance is also related to the “catalytic sensitization” effect and the “electron sensitization” effect triggered driven by Au NPs. It is hoped this Au‐SnO2 sensing material with such great gas response, selectivity and low detection limit will help detect n‐butanol at room temperature to lower energy consumption.

Chemiresistive Materials for Alcohol Vapor Sensing at Room Temperature

“…Further examples of MOFs-derived porous MOSs are the nano-cubic-structured SnO 2 [53,54] and Fe 2 O 3 [55], both obtained through calcination and used to detect butanol efficiently and selectively. These recent publications demonstrated that MOFs can be used as useful templates to synthesize MOSs with outstanding peculiar morphologies, structures, and porosity for sensing applications.…”