UV Light Assisted NO2Sensing by SnO2/Graphene Oxide Composite

Proceedings

Nanda Gunawardhana¹  Hashitha M. M. Munasinghe Arachchige²  Dario Zappa²  Elisabetta Comini² 

[1] International Research Centre, University of Peradeniya, 20400 Peradeniya, Sri Lanka;SENSOR Lab, Department of Information Engineering (DII), Università degli Studi di Brescia, Via Branze, 38, 25123 Brescia, Italy;

关键词: SnO₂;    reduced graphene oxide;    metal oxide gas sensors;    Low temperature gas sensors;    NO₂ Sensing;    SnO₂ /rGO heterojunction;    UV light irradiation;   

DOI  :  10.3390/proceedings2130787

来源: DOAJ

【 摘 要 】

Nitric oxide (NO₂) is one of the air pollutants that pose serious environmental concerns over the years. In this study, SnO₂ nanowires were synthesized by evaporation-condensation method and graphene oxide were synthesized using modified Hummers method for low temperature NO₂ detection. Drop cast method was used to transfer graphene oxide (GO), to form composite GO-metal oxide p-n junctions. With integration of reduce graphene oxide (rGO), the UV light absorption was enhanced. This metal oxide composite has shown a reversible response in detecting low concentrations of NO₂ under UV irradiation, with a working temperature range of 50–150 °C. Pure SnO₂ shows 20% response to NO₂ (4 ppm) in dark conditions, while the response increasesupto60%usingUVirradiationat50°C.Furthermore, SnO₂/rGOshowsa40%ofresponse in dark, while the response increases to 160% under UV light illumination. This composite exhibits excellent recovery and maintains the baseline under UV light at low temperatures, which effectively overcome the drawbacks of low recovery typically shown by metal oxide gas sensors at low temperature.

【 授权许可】

Unknown