Study On Humidity Response Property Of Graphene Oxide Films

Humidity is closely related to the production and life of modern people.The selection of humidity sensitive materials is directly correlated to the sensitivity of humidity sensing and other indicators.The existing humidity sensitive materials are mainly divided into inorganic materials,organic or polymer materials and twodimensional materials.Inorganic materials need high processing temperature,making the wide application impossible.Organic or polymer materials have high solubility under high humidity,and their application is limited.Because of its large specific surface area,2D materials can expose more active sites,which has attracted the attention of researchers.Graphene oxide has the same as the graphene of two-dimensional planar structure,and contains rich oxygen containing functional groups,so it has excellent hydrophilic performance,very suitable for as the humidity sensitive material.Based on this,a series of studies on the humidity response properties of graphene oxide films have been carried out in this paper.The humidity sensitivity of graphene oxide films was investigated,and the reason why graphene oxide films can be used in humidity sensing was discussed by various characterization methods.The output electrical signal increases with the increase of the relative humidity of the environment at 1 V voltage,non-contact humidity sensing can be realized and the location of humidity source can be directly located.When the applied voltage is 1 V and the humidity source distance is 0.2 cm,the sensitivity is 120.The self-powered humidity sensor was prepared by high humidity electric field annealing.Humidity sensing is realized without additional voltage.This device has high sensitivity and stable performance.As the same as graphene oxide films,the output signal increases with increasing humidity,this method of array device can be directly positioning humidity source location,and work well without voltage.The sensitivity is 450 when the humidity source distance is 0.2 cm.The zero-power humidity sensor was prepared by using the characteristics of direct reaction between reactive metal at room temperature.No additional voltage is required during the preparation and operation of the device,and the device has high sensitivity,stable performance and simple preparation method.Similar to the generation mechanism of self-powered humidity sensor,hydrated proton spontaneously diffuses from high concentration to low concentration when humidity changes.It has the same characteristics as self-powered humidity sensor but have better performance.This article explores the zinc-gold,copper-gold,aluminum-gold asymmetric electrode,due to the sensitivity based on the current changes as the judgment standard,so the selection of the output current density of zinc-gold as the electrode structure.The effect of device structure on performance was further investigated,and it was found that planar structure had better performance than vertical structure.The zinc-gold planar device sensitivity can reach 3000 when the humidity source distance is 0.2 cm.A zero-power humidity actuator is directly prepared on the metal surface,which can deform with the change of environmental humidity.Changing curvature increases with increasing humidity.GO-r GO film which prepared on copper substrate under the condition of RH 94% of maximum curvature of up to 180°.Based on this,the intelligent device,which is driven by humidity,can grasp and package objects and can be applied in more fields.