Preparation And Application Study Of Carbon Fiber-based Flexible Optothermal Sensing Materials

With the development of society and population growth,the demand for energy has been increasing,leading to a growing energy crisis.Solar energy is a rich,green,and sustainable energy source that can effectively alleviate the energy crisis,thus attracting widespread attention from researchers.Thermal materials can convert solar energy into heat energy through the photothermal effect,thus achieving the goal of using solar energy.Carbon fiber,as a type of thermal material,has high strength,low density,high electrical and thermal conductivity,high light absorption,good postprocessing properties,and excellent biocompatibility,making it a material with enormous potential in the field of photothermal sensing.Currently,the application of carbon fiber in photothermal and sensing fields is relatively lacking.Based on this,this study investigated the performance and application of carbon fiber in the field of photothermal sensing,with the specific research content as follows:(1)Surface delamination and loading of different metal nanoparticles were performed on the flexible fabric sensing material woven from carbon fiber strands,and the influence of different light irradiation powers and angles on the photothermal performance was investigated.Additionally,the sensing performance and application of the carbon fiber fabric photothermal sensing material were explored.The results showed that the carbon fiber fabric photothermal sensing material has very sensitive photothermal response performance and excellent photothermal conversion performance,with a maximum surface temperature of 135.1 ℃.Different light irradiation angles would affect the response of the fabric sensing material.The fabric sensing material has good responsiveness to temperature and pressure changes and also has good recognition and sensitivity to human motion information.The surface loading of different metal nanoparticles would affect the photothermal conversion performance of the carbon fiber fabric sensing material.The surface temperature of the material loaded with gold nanoparticles can reach 168.7 ℃,and the surface loading of copper nanoparticles on the fabric can achieve infrared camouflage anti-counterfeiting.(2)A carbon fiber-based photothermal sensing chip was prepared by screen printing.Carbon fiber powder was mixed with ink additives to prepare conductive ink using the high light absorption and high conductivity of carbon fiber.The conductive ink was printed onto different flexible substrates by screen printing to produce a photothermal sensing chip.The influence of the carbon fiber powder content and substrate selection on the printing effect and photothermal conversion performance was investigated,and the sensing performance of the photothermal sensing chip was studied.The results showed that the photothermal sensing chip with 0.4 g carbon fiber powder added had good printing effect and sensitive and stable photothermal response performance.Among the three printing substrates,the A4 paper substrate had the best photothermal conversion performance,and the surface temperature could reach154.23 ℃.In addition,the flexible photothermal sensing chip has high sensitivity and stability in sensing performance research and has potential applications in the fields of human motion information monitoring and pressure sensing.