Wearable gas sensor utilising dye-functionalized single-walled carbon nanotubes

The suspension of single-walled carbon nanotubes (SWCNTs) that was functionalized by organic dye, was used as a sensing material. The Golden orange dye (Color Index : 40215) was used as the dispersion agent in order to establish a stable suspension of SWCNTs in water. The ratio of dye and deionized water (DI water) mixture is 1:1. Uniform thin film of SWCNTs was produced using vacuum filtration method where uniform thin film of SWCNTs network was formed. In this project, plastic was used as a substrate. The device was then being exposed to NO₂ gas at three different temperatures which is room temperature, 200 °C and 300 °C.