| In recent years,with the rapid development of modern science and technology,artificial intelligence and electronic integration have been vigorously developed.Benefitting from the soft,comfort,and strong operability,flexible pressure sensors have attracted much attention for widely used in the human body motion capture and human-computer interaction,having become potential substitutes for smart wearable devices.However,the traditional piezoresistive sensor has a strong environmental dependence,which causes irreversible damage of the sensor by droplet erosion in the wet environment or the presence of liquid environment,so that the water repellency has a very important significance for conductive materials in the practical application.At present,superhydrophobic properties has been introduced into the preparation of piezoresistive sensors to improve the environmental adaptability and stability of flexible piezoresistive sensors.Therefore,it is a good application significance that the introduction of superhydrophobic properties into the flexible piezoresistive sensor has for the application of materials in extreme environments.In this paper,we mainly studied the preparation of pressure sensor with cheap and easy to obtain mature flexible materials which are used as substrates piezoresistive to build conductive network,such as fabric and sponge.The superhydrophobic flexible piezoresistive sensor is obtained after the flexible substrate with the conductive network was treated with low surface energy substances.The superhydrophobic performance protects the material from moisture vapor in the air and human sweat,prolongs the service life of the sensor,broadens the application range of the sensor,and improves the environmental adaptability of the sensor.The main contents are as follows:(1)Due to the bargain and soft,cotton fabric was selected as substrate for the deposition of the MXene nanosheets,and then,spherical PPy network was prepared by in-situ chemical oxidation on the surface of MXene cotton fabric.MXene and PPy constituted conductive network and roughness required for preparation of superhydrophobic materials.Superhydrophobic properties was obtained by surface treatment with hexadecyltrimethoxysilance as a low surface energy material.The fabric sensor has short response time(100 ms)and recovery time(80 ms)and excellent mechanical durability(>1000 cycles).At the same time,superhydrophobic properties gives sensor water repellent(WCA=158°),anti-corrosion,friction resistance,self-cleaning performance and air permeability,which is suitable for long-term wear of human body.More fortunately,sensor can maintain the same sensing response performance in wet and corrosive environments as in dry environment,broadening the application range of the material.When it was applied to human movement detection,the sensor can timely feedback human movement information,accurately distinguish human movement type.When the sensor was used as a hidden signal transmission device,it can accurately express the applied ground information,which is ideal for waterproof electronic devices.(2)Ag-CNTs were loaded on the 3D flexible PU sponge skeleton with PVDF as a binder,and PDMS was used as a surface modifier to obtain a superhydrophobic lightweight sponge piezoresistive sensor.The sponge sensor has short response time(170 ms)and recovery time(60 ms),excellent mechanical durability(>1000 cycles)and excellent sensing stability in a variety of environments.Besides,it has excellent water repellent(WCA=150°),anti-corrosion and self-cleaning properties,which can prolong the service life of the sensor.When it was applied to monitoring human movement,the sensor can detect various motion forms,including bend,press and vibration,and overcome the disadvantage of easily damaging the sensor in water and sweat environment... |
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