Preparation And Characterizations On The Hybrid Multimaterial Fibers

The rapid development of information age with explosive growth of data benefits from the constantly updated optical communication system,and optical fiber plays an important role in this field.With the continuous improvement of scientific standards and material science,the fabrication and characterization of silica-glass optical fibers have been developed into a sophisticated and precise art.However,there is no boundary to in science,so excavating deeply traditional materials and optimizing manufacturing process have become a pivotal direction in the field of optical fiber.The emergence of multimaterial fiber breaks through the limitation of the traditional optical fiber.Attractively,a single fiber can be gifted with various functions by combining the materials with optical,electrical,thermal,magnetic,acoustic,mechanical and other properties.It plays a crucial part in fiber lasers,sensors,photoelectric detection,biomedicine,neuroscience,micro-nano manufacture,wearable textiles and other fields.Even now,there are still a lot of works needs to do,such as the application of novel materials,the dynamics research and quality improvement of materials interface,the creative design of new structure,and the integration of dense device.In this thesis,we focus on the design,fabrication and application of the multimaterial fiber.The hydrodynamic of high-temperature viscous-fluid state for the multi-component glass and metal composite fiber has been studied.Two types of multimaterial fiber composites,semiconductor-metal-polymer and metal-glass fiber have been prepared and applied.The main achievements are summarized as follows:(1)The high-temperature viscous-fluid state of the composite fiber composed of metal and multi-component glass has been analyzed by hydrodynamic.By combining the experiment results and mathematical simulation,the stress and the velocity distribution of the composite system at visco-fluid state during the drawing process has been studied.We have found the phenomenon that the stress will concentrated in the glass preform rod tip during the high temperature.It has been confirmed that the stress is related to the glass viscosity,the diameter of the preform rod and the drawing velocity.The results provide a valuable reference for the preparation of the metal composite multi-component glass fiber in Chapter 3.(2)Controllable preparation of multimaterial fiber composite composed of multi-component glass matrix and metal electrodes.We have designed and fabricated a type of metal-glass fiber,which can be used for simultaneously transmitting light and detecting bioelectrical signals in living animals.The optical,mechanical,electrical and other physiochemical properties of the fiber probe have been tested and characterized.The fiber probe has excellent optical transmittance(over 80%)and low loss(about 0.0367 d B/cm at 589 nm and about 0.0216d B/cm at 980 nm).Moreover,the optical fiber probe has a unique advantage in deep brain detection due to its sufficient strength.At the same time,the electrical conductivity of the probe is good and the impedance of the probe at 1 k Hz is only 5.72 M???m².By using this fiber,both of the optical stimulation and neural recording can be realized.The optogenetic experiments show that probe can be used for shallow and deep brain stimulation and recording and modulating biological behavior in vitro.(3)Controllable preparation of multimaterial fiber composite composed of semiconductor,metal and polymer.Three kinds of semiconductor composite fibers have been designed and fabricated.Based on the Plateau-Rayleigh instability of the fluid in fiber,micro-nano semiconductor spheres and micro-nano fibers have been prepared by stack-and-draw approach and subsequent heat-treatment.The diameter of spheres and fibers can be tailored at the range of micro and nano meter.A new trapezoidal connected photodetector has been achieved by adjusting internal configuration in fiber after heat-treatment.The photoelectric detection performance of the composite fiber has been measured.The device has good photoelectric response at the irradiation of 800 nm laser(the rate of I_liglt/I_dark near to 4.8,and the rising and decay times are estimated to be about 0.11 and 0.17 s).The device also has reliable stability(The response and recovery times remained nearly constant over 10 cycles).The technology can be extended to the glass matrix fiber.