Chi Hong, Liu Yan Jun, Wang FuKe, He Chaobin
Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
Institute of Materials Research and Engineering, A-STAR (Agency for Science, Technology and Research) , 3 Research Link, Singapore 117602.
ACS Appl Mater Interfaces. 2015 Sep 16;7(36):19882-6. doi: 10.1021/acsami.5b06883. Epub 2015 Aug 31.
Uniform graphene oxide (GO) film for optical humidity sensing was fabricated by dip-coating technique. The resulting GO thin film shows linear optical shifts in the visible range with increase of humidity in the whole relative humidity range (from dry state to 98%). Moreover, GO films exhibit ultrafast sensing to moisture within 250 ms because of the unique atomic thinness and superpermeability of GO sheets. The humidity sensing mechanism was investigated using XRD and computer simulation. The ultrasensitive humidity colorimetric properties of GOs film may enable many potential applications such as disposable humidity sensors for packaging, health, and environmental monitoring.
采用浸涂技术制备了用于光学湿度传感的均匀氧化石墨烯（GO）薄膜。所得的GO薄膜在整个相对湿度范围（从干燥状态到98%）内，随着湿度的增加，在可见光范围内呈现线性光学位移。此外，由于GO片层独特的原子级薄度和超渗透性，GO薄膜在250毫秒内对湿度表现出超快传感。利用X射线衍射（XRD）和计算机模拟研究了湿度传感机制。GO薄膜的超灵敏湿度比色特性可能使许多潜在应用成为可能，如用于包装、健康和环境监测的一次性湿度传感器。
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