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

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 wt% ZZS HNFs exhibited the excellent gas-sensing property with a sensing response value of 25.7 towards 100 ppm HCHO, fast response/recovery time (12 /45 s) and the detection capacity of HCHO down to 500 ppb in a rapid response/recovery time (10 /2 s) 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 wt% ZZS HNFs still presented high sensitivity of HCHO, highlighting its bright commercial prospect in the future of smart indoor air quality monitoring.