Preparation Of Metal Oxide Nanofibers With Different Morphologies By Electro - Spinning And Their Optical And Electrical Properties

In recent years, nanomaterials have become the research hotspot in the field of condensed matter physics and materials science applications, which will stimulate the rapid innovation and development of nanotechnology. Electrospinning has been recognized as a convenient, efficient and easy-controlled technique to produce micro/nanostructures, especially for the one-dimensional(1D) nanostructure. Due to their unique physical, chemical and biological properties, 1D nanomaterials have been widely applied in many fields such as nanoscale electronic devices, optoelectronic devices,sensors, photocatalytic and solar cells, etc.First of all, ultrathin In2O3 hollow fibers have been successfully prepared by a new method combining electrospinning and magnetron sputtering. We have investigated the photoresponse of the In2O3 hollow fibers under UV illumination with different wavelengths and the results show that the as-assemble device could enhance the conduction significantly when exposed to UV light. The sensitivity is as high as 102 while the response time is less than 10 s. In addition, We also studied the relationship between distance and sensitivity, and demonstrated that the sensitivity decreases with the increase of the lamp-to-sample distance.Secondly, TiO2 nanorods with anatase phase have been fabricated successfully through traditional electrospinning. In addition, the mechanical and optical properties were investigated and the results showed that the device based on TiO2 nanorods exhibits high sensitivity and good stability under bending, and the photocurrent became increased with a high sensitivity(~103) when exposed under light with the power of 10.24 m W,which demonstrated the device could be used as the flexible devices and photodetector devices.Finally, through combining low-voltage near-field electrospinning with direct printing technology, we have prepared various highly aligned nanostructures, such as P(VDF-TrFE) nanofibers, ZnO nanofibers and In2O3 nanofibers. Further more, we also made a preliminary investigation about the photoresponse under the different wavelengths and ultraviolet light intensities for single ZnO nanowire, which provided the basis researches for the further study. The research results showed that single ZnO nanowire exhibited the highest response under the wavelength of 340 nm. Though under the ultraviolet light with low intensity, the ZnO nanowire still had a high sensitivity, which provided a great possibility for the development of optical detector with high performance.Besides, taking advantage of this technology, heterojunction or homojunction with cross structure can be assembled by compositing various nanomaterials such as inorganic and inorganic, inorganic and organic, organic and organic nanomaterials. Taking advantage of this technology, it’s helpful to promote the development of organic/inorganic nanofibers in the applications of nanodevices and logic nanocircuit.