Highly Sensitive and Fast Response Colorimetric\nHumidity Sensors Based on Graphene Oxides Film

Abstract

Uniform\ngraphene oxide (GO) film for optical humidity sensing was fabricated\nby dip-coating technique. The resulting GO thin film shows linear\noptical shifts in the visible range with increase of humidity in the\nwhole relative humidity range (from dry state to 98%). Moreover, GO\nfilms exhibit ultrafast sensing to moisture within 250 ms because\nof the unique atomic thinness and superpermeability of GO sheets.\nThe humidity sensing mechanism was investigated using XRD and computer\nsimulation. The ultrasensitive humidity colorimetric properties of\nGOs film may enable many potential applications such as disposable\nhumidity sensors for packaging, health, and environmental monitoring.