The Fabrication And Property Researches About Flexible Devices Based On Low-Dimension Nano-materials

Flexible electronic devices,compared to the traditional,has a wide application prospect in recent years in fields of information transmission,energy conserving,health care and others due to the advantages of excellent electrical properties,unique extensibility and the easy,low-cost production process.However,there are still a long way from the goals of universal access,because when we apply the strain or pressure on the flexible devices,there will be some crack or fracture on the components,which will lead to decrease in the performance or detection precision of the device.And this is what we should to solve during our research.In order to improve the performance and overcome the shortage of flexible electrical devices,in this paper,we utilize the flexible substrate with properties of low-cost and high extensibility — PDMS and PI to fabricate flexible electronic devices by depositing the low-demension nanomaterials with great electrical properties and uniformity,such as silver nanoparticals,carbon nanotubes and silver vanadate nanowires,that is prepared by the ways of oxidation-reduction and hydrothermal or other methods.During our researches,the flexible electrical devices mentioned above exhibit excellent characters on extensibility,electricity and long-term stability,which could be applied on a lot of areas.On stress measurement,the fabricated flexible strain sensor based on silver nanoparticals/carbon nanotubes composites shows properties of high stretchable and sensitivity,and the gauge factor is up to 39.8,overcoming the shortage of low recovery.Besides,the pressure sensor based on silver nanoparticals and three-demensional structure on the surface of PDMS has an excellent performance on the detection of pressure,during our measurement,the resistance change rate is up to 722%,and the device is easy to carry and can be used repeatedly for lots of times without performance slowdowns at the same time;On health care,the as-prepared breath sensor based silver vanadate nanowires can recognise the change of breath rate or margin,which will tremendously improve the prevention and treatment about sleep apnea.On energy harvesting,we fabricated a flexible hybrid nanogenerator based on PVDF film and PTFE nanostructure,and this device can harvest hermal and mechanical energies in nature,which is used for Self-Powered cathodic protection in this study,this kind of device offers a reference implementation about the research of energy conservation and power-up in other systems,like health care and wireless communication.The flexible electrical devices on stress measurement,health care and energy harvesting has overcome the shortages of small detection range,low precision and the component failure under large deformation compared to the traditional devices.And we are making effort for the application of flexible devices in clinical care and body comfort based on the excellent electrical and physical performance.This will be the pioneers of next generation of new electrical devices.