Polymeric Electrospun Nanofibers in Optical Applications

• Main Authors: Chun-Ching Chang, 張純菁
• Other Authors: Changshu Kuo
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/92790065121298172973

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 96 === Electrospun nanofibers from optical polymers, such as PMMA (polymethyl methacrylate) exhibit remarkable interaction with ambient light as shown in their UV-vis spectra. Diameters of electrospun PMMA nanofibers determined by SEM images illustrate the linear dependence on the absorption peaks. UV-vis absorption spectra of these PMMA nanofibers with difference deposited thickness, incident angles, and the media within fiber spacing were also carefully investigated. In addition, the software simulation was also conducted in order to further explain the light absorption* phenomenon of PMMA nanofibers. Fluorescent dyes, including Coumarin 6 and Ru(bpy)3Cl2, were utilized to examine the possible light trapping by the electrospun nanofibers. PMMA/Coumarin 6 and PMMA/Ru(bpy)3Cl2 composite nanofibers were electrospun and investigated in terms of the fluorescence enhancement as a function of deposited thicknesses. The adsorption and emission spectra of dye-doped PMMA nanofibers with various PMMA/dye concentrations and deposited thickness were analyzed. Fluorescence intensities were carefully normalized by PMMA weight per unit area, so that the emission enhancement could be quantified and compared. According to the experimental results, the fluorescence enhancement from dye-doped PMMA nanofibers did reveal the relationship with the deposited thicknesses of electrospun nanofibers. Especially in the UV region, the electrospun PMMA nanofibers successfully confined the incident irradiations within the nanostructures.