The Photoelectric Performance And Liquid Microvibration Detection Of TiO₂ Nanoparticle Intercalation-Modulated Graphene Fiber

Underwater vibration detection is one of great importance in personal safety,resource exploitation,and military defense.While underwater vibration detector based on different principles have been developed,it is still necessary to develop new detection methods further.The wet-spinning has the advantages of simple operation,mass production,and easily to compound with functional components to form a composite fiber with stable structure and excellent performance.Here,we present a novel method for detecting liquid microvibration based on photoelectric properties.By assembling the photoelectric graphene composite fiber into a spring structure and using its photoelectric properties were affected by the effective illumination area,the change of photoelectric signal of the spring under different liquid vibration conditions was systematically studied,and finally the highly sensitive detection of liquid microvibration was realized.In this thesis,the TiO₂ nanoparticles intercalation-modulated graphene fibers,the photoelectric properties of composite fibers,and the application of composite fiber in the detection of liquid microvibration were systematically studied.The specific research is as follows:?1?TiO₂ nanoparticles intercalation-modulated graphene fibers:the effects of TiO₂ content on fiber structure and tensile properties were systematically studied.It was revealed that the addition of TiO₂ nanoparticles made the graphene sheets produce more folds,and the degree of fold of the composite fiber increased with the increase of TiO₂content.The effect of fiber fold structure on tensile properties was investigated in detail,and the elongation of fiber increased with the increase of fiber fold degree.TiO₂nanoparticles intercalation-modulated TiO₂/graphene with high fold structure and high elongation were fabricated.?2?The photoelectric properties of composite fibers:based on the research on the photoelectric response performance of composite fiber with different TiO₂ content.It is found that the photoelectric response of composite fiber increases with the increase of TiO₂ content,and the effective illumination area is the main reason that affects the photoelectric performance.The photoelectric properties of the composite fibers were further enhanced by oxygen plasma etching and hydrogenation of TiO₂.The composite fiber with high photoelectric response was prepared in a controllable manner,and this study also provides theoretical support and experimental basis for the design of photoelectric liquid microvibration detector.?3?Liquid microvibraion detector based on H-TiO₂/graphene spring:based on the research on the photoelectric properties of the composite fiber above,the H-TiO₂/graphene spring with compact structure was obtained by winding the fiber on the surface of the glass rod and annealing.Due to the characteristics of large photoelectric response fluctuation of the spring under small deformation,the liquid vibration caused by different inducements was detected.This detector detected liquid vibration induced by 20?L liquid drop falling from 20 cm.