Smart formaldehyde detection enabled by metal organic framework-derived doped electrospun hollow nanofibers

Abstract

Abstract In this work, the metal-organic framework (MOF)-derived Zn2+ doped SnO2 (ZZS) hollow nanofibers (HNFs) have been successfully synthesized via facile electrospinning and annealing techniques for achieving the low concentration of HCHO monitoring. As the hollow nanostructure and the optimized Zn2+ homogeneous doping behavior ensure all the smooth electrons transfer, abundant chemisorbed active sites and oxygen vacancies, the 15\u202fwt% ZZS HNFs exhibited the excellent gas-sensing property with a sensing response value of 25.7 towards 100\u202fppm HCHO, fast response/recovery time (12 /45\u202fs) and the detection capacity of HCHO down to 500\u202fppb in a rapid response/recovery time (10 /2\u202fs) compared with pristine SnO2 and other ZZS HNFs. Moreover, when assembled into a practical smart detection device for real-time monitoring and early warning of HCHO, the 15\u202fwt% ZZS HNFs still presented high sensitivity of HCHO, highlighting its bright commercial prospect in the future of smart indoor air quality monitoring.