Amine-Functionalized\nBlack Phosphorus Nanosheets toward\nUltrafast and Room-Temperature Trace Carbon Dioxide Sensing

Abstract

Carbon dioxide (CO₂) poses a significant effect\non global\nclimate, indoor activity, and crop yield, thus necessitating real-time\nand high-performance detection. Traditional CO₂-sensing\nmaterials always suffer from weak and sluggish reaction, elevated\noperation temperature, and poor detection limit. To surmount these\nobstacles, in this work a series of amine-rich polymer functionalized\nblack phosphorus nanosheets (BP) were prepared for room-temperature\nCO₂ detection. Superior to TMMAP or 3-DEAPTES modified\ncounterparts, the BP-10% APTES sensor delivered a response of 28.5%\nand ultrafast response/recovery time of 4.7 s/4.8 s toward 10 ppm\nof CO₂ under 36% RH at 22 °C, a lowest detection limit\nof 5 ppm, as well as excellent selectivity. Also, a nice repeatability\nand long-term operation stability were demonstrated. Thus, BP-APTES\ncomposites offer a promising strategy for high-performance CO₂ detection in terms of high sensitivity, low power-consumption,\nand convenient fabrication, and showcase brilliant prospects in portable\noptoelectronic detection systems and the Internet of Things.