Research On The Optical Properties Of Graphene And ZnO Composite Materials

In recent years,flexible inorganic devices have become a hotspot in the development of new information devices.The integration of different functional devices on flexible substrates can make the traditional semiconductor devices have flexible and extensible properties.Flexible sensor as an important functional unit of ductile flexible inorganic devices has become a key technology for the development of flexible devices.Therefore,the preparation of high performance flexible inorganic sensors is conducive to the development of flexible inorganic devices in medical,health and networking.Especially based on carbon nanotubes and graphene and other low-dimensional nano-carbon material flexible sensor,both to achieve flexibility,but also with low-dimensional nano-carbon materials,good mechanical properties and electrical properties.Therefore,this paper designs and fabricates the photoelectric sensor based on the low-dimensional nanocarbon material.The performance of the device is tested and analyzed,and the photoelectric properties of the device are modulated by means of surface modification of zinc oxide nanoparticles.Firstly,based on the fabrication of carbon nanotubes by chemical vapor deposition and the preparation of carbon nanotubes dispersed solution,combine carbon nanotubes and polydimethylsiloxane(PDMS)were achieved by spin-coating carbon nanotubes dispersion on the polydimethylsiloxane(PDMS)flexible substrate.The carbon nanotubes and zinc oxide nanoparticles were further compounded by spin-coating the zinc oxide nanoparticles dispersion on a PDMS substrate with integrated carbon nanotubes.The conductivity test of the device showed that the composite functional layer did not have good electrical conductivity.Based on the characterization and analysis of the surface morphology of the composites,it was observed that the carbon nanotubes could agglomerate on the substrate and destroy the conductivity due to the hydrophobic properties of the PDMS substrate.In view of the large surface area and other surface properties of graphene,this paper uses graphene in the second part to overcome the problem of agglomeration of nano-carbon materials caused by hydrophobicity of PDMS substrate.On the basis of spinning the graphene dispersion onto the PDMS substrate to realize the formation of a homogeneous graphene layer on the PDMS substrate,the photoresponsive properties of the material are improved by the method of zinc oxide nanoparticle modification,Band gap band structure caused by the light response is not strong problem.Finally,a flexible photoelectric sensor was designed and fabricated by nano-zinc oxide modified graphene / PDMS structure.The results of light response measurement of nano-zinc oxide,graphene,nano-zinc oxide / graphene composites from the visible wavelength(532nm)to the infrared wavelength(980nm)show that the nano-zinc oxide / graphene composite The response of the light is in the range of 532 nm to 980 nm,and the response wavelength is more than 50 times higher than that of the individual nano-zinc oxide and graphene.The test results show that the interaction between nano-zinc oxide and graphene plays a very important role in enhancing the optical response of the composites.Furthermore,the photoelectric response of the photoelectric sensor composed of graphene / PDMS modified by nano-zinc oxide showed that the wavelength and power of light had a significant effect on the response amplitude of the sensor.The mechanism of light response of the device was analyzed and discussed.The results show that the surface effect between graphene and nano-zinc oxide plays a role in the photoelectric response of the device.The photoreaction of the device is characterized by the microstructure and the light absorption characteristics of the nano-zinc oxide / graphene composite.Very important role.This part of the work shows that the photoelectric sensor based on nanometer zinc oxide / graphene composites is a kind of flexible photoelectric sensor with good performance and low cost.It has potential application value in wearable electrons.