Preliminary Study Of Chemical Sensor Based On Micro/Nano Fibers Fabricated By Electrospinning Technology

Fiber-optic technology has been rapidly development over the past few decades, all-fiberdevices have attract more and more attention of researchers. Due to the diameter of micro-and nano-scale fibers (hereafter referred to as micro-nano fiber) less than optical wavelength,high refractive index difference between core and cladding make fiber have a strong bindingability on light filed. Meanwhile, micro-nano fiber has evanescent wave transmissioncharacteristics. Micro-nano fiber technology increases the response speed and sensitivity ofoptical device, reduces volume of optical device and power loss. These advantages haveprompted fiber and fiber device in the direction toward the development of miniaturization. Infuture, micro-and nano-micron fibers can be used to build nano-scale or micro-scale photonicdevices units or miniature optical sensor units. Therefore, the preparation of micro-nano fiberhas far-reaching significance and has attracted widely international attention.Currently, the more mature preparation methods of almost all of the micro/nano fiber(Micro/nano Fiber, referred to as MNF) are based on laser heating or flame heating. However,there is less report concerning on how to prepare high polymer micro/nano fibers.Electrospinning method is one of the most simple and effective ways to prepare polymermicro/nano fiber. In this paper, a minimum diameter of300nm and length up to tens ofcentimeters of high polymer micro/nano fiber has been successfully prepared byelectrospinning technology. The micro/nano fiber diameter can be controlled in the rangechange of300nm to1000nm by changing solution concentration and mixed solvent volumeratio. The scanning electron microscope image indicates that the preparation of polymermicro/nano fiber has a good surface smoothness and diameter uniformity. At the same time,coupling theoretical simulation and coupling experimental results have also proved thatpolymer micro/nano fiber has good guiding light characteristics. Micro/nano fiber prepared byelectrospinning techniques has potential applications in optical fiber sensors and micro/nanophotonic devices. Electrospinning provides a preparation method of micro/nano fiber withdiameter uniform and smooth surface. This method does not need expensive equipment andcomplex processes.High Polymer micro/nano fiber is easily doped variety of function materials offluorescent dyes, enzymes and metal oxide, which is difficult to achieve in inorganic micro/nano fibers, such as quartz and glass material fibers. Therefore, we prepared neutralred-doped PMMA polymer micro/nano optical fiber and [Ru(dpp)3]Cl2-doped gelmicro/nano optical fiber by electrospinning. Moreover, we use them to conduct detectionexperiments of ammonia concentration and oxygen concentration, respectively. The highpolymer micro/nano fiber has advantages for a smooth surface, uniform diameter, highsurface volume ratio, etc. Hence, the gas molecules easily diffuse into the fibers and reactwith the indicator incorporated. Therefore, compared with traditional method, gas sensingmethod based on micro/nano fiber has more advantages, such as smaller and more sensitivefor devices, etc. It is helpful for developing the miniaturization optical fiber gas sensors withdiverse functions, stronger sensitivity, faster response.