Humidity sensors detects the amount of water in the atmosphere and transforms it into a measurable signal. It plays a significant part in controlling humidity in certain application areas such as monitoring moisture in agriculture, processing industry, device fabrication laboratories, monitoring indoor air quality, controlling domestic instruments, medical applications and in weather forecasting. Humidity sensors is one of the habitual sensors used in our regular activities. Discussions on the limitations and challenges of the graphene-based humidity sensors along with its future trends are made. The review also studies the performance and recent trends in humidity sensor based on graphene, graphene quantum dots, graphene oxide, reduced graphene oxide and various composite materials based on graphene such as graphene/polymer, graphene/metal oxide or graphene/metal. This review extensively discusses graphene-based devices intended towards sensing humidity, starting from the methods of synthesizing graphene, its electronic and mechanical properties favoring sensing behavior and different types of sensing mechanisms. There is no such extensive review on graphene-based devices for humidity sensing applications. Graphene and its composites have shown great potential in performing as humidity sensors owing to enormous surface area, very low electrical noise, high electrical conductivity, mechanical and thermal stability and high room temperature mobility. Precise evaluation of humidity percentage in air is the need of various applications. Humidity sensors are of utmost importance in certain areas of life, in processing industries, in fabrication laboratories and in agriculture.
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