Spectral Analyses of Liquid-Crystal—Multiwall-Carbon-Nanotube Colloidal Suspension

• Main Authors: Hui-Yu Chen, 陳惠玉
• Other Authors: Wei Lee
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/2f4t5n

碩士 === 中原大學 === 應用物理研究所 === 91 === Recent studies in this laboratory indicate that multiwall carbon nanotubes (CNTs) as a dopant can enhance nonlinear optical properties of host liquid crystal (LC), because they can form charge-transfer (CT) complexes in the system. Evidence of existence of a third matter through intermolecular interaction in the solution is provided by the fact that neither the absorption spectrum nor the fluorescence spectrum of the solution is equal to the sum of that of liquid crystal and of multiwall carbon nanotubes. We found that the central wavelengths of the new bands depending on the concentration of these solutes (LC or CNTs), shift in the spectra. From the experimental and theoretical data the smallest proportion of LC to CNTs is found to be about 100:1 in a CT complexe, and the LC molecules are thought to align primarily parallel to the long axis of CNTs.