Highly Efficient SO2 Sensing by Light-Assisted Ag/PANI/SnO2 at Room Temperature and the Sensing Mechanism

• DOI: 10.1021/acsami.1c14548
• Publication Date: 2021-10-07T02:42:06Z
• Authors: Haoyuan Xu; Jianzhong Li; Peidong Li; Junjie Shi; Xuanwen Gao; Wenbin Luo
• Keywords: Tin dioxide; Electrochemical gas sensor; Titanium Dioxide

Sulfur dioxide (SO2) is one of the most hazardous and common environmental pollutants. However, development room-temperature SO2 sensors seriously lagging behind that other toxic gas due to their poor recovery properties. In this study, a light-assisted sensor based on polyaniline (PANI) Ag nanoparticle-comodified tin nanostructures (Ag/PANI/SnO2) was developed exhibited remarkable sensitivity excellent The response Ag/PANI/SnO2 (20.1) 50 ppm under 365 nm ultraviolet (UV) light illumination at 20 °C almost 10 times higher than pure SnO2 sensor. Significantly, UV-assisted had rapid time (110 s) (100 SO2, but in absence light, performance or were even severely irreversibly deactivated by SO2. also selectivity, superior reproducibility, satisfactory long-term stability room temperature. increased charge carrier density, improved charge-transfer capability, active surface revealed electrochemical measurements endowed with high sensitivity. Moreover, light-induced formation hot electrons high-energy state significantly facilitated