多孔矽奈米管與十八面體結構之光學特性研究

Optical properties of silicon dioxide nanotube and decaoctahedren structures

陳志瑋(Chin-Wei Chen)

指導教授 ： 陳永芳

國立臺灣大學/理學院/物理研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01456

摘要

無

關鍵字

多孔矽

並列摘要

Abstract
In this thesis, we reported an investigation of optical properties of novel structures of mesoporous silica materials. The experimental techniques include Photoluminescence (PL), Photoluminescence excitation (PLE), X-ray diffraction, and Fourier transform infrared spectra. Several interesting results have been discovered which are summarized as follows.

I. Optical anisotropy of MCM-41 mesoporous silica doped R6G materials

For mesoporous silica materials with hierarchical nanotube structure, it is found that the decay behavior of the luminescent intensity follows an exponential function. PLE spectra were used to confirm the origin of the emission. We show that the PL spectra reveal strong polarization dependence due to the anisotropic structure of the sample. The optical anisotropy is attributed to the large difference of the dielectric constant between the cylinder and its surrendering.

II. Whispering gallery modes in highly hexagonal Symmetric structures of 3-D SBA-1 mesoporous silica

In chapter 4, we show some optical properties of mesoporous silica materials with highly hexagonally 3-D symmetric structure, so called SBA-1, by Fourier Transform Infrared Spectroscopy (FTIR). Based on hexagonal cavity model, we can compare the theoretical and experimental WGM results. In addition, we also show that the absorption strength of CO2 and H2O molecules can be greatly enhanced due to the existence of WGMs in SBA-1 mesoporous structure. When the absorption frequencies of gas molecules match with WGMs, the light wave can be completely absorbed.

並列關鍵字

silicon dioxide

參考文獻

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Chapter 1:

3.A. Sayari, Chem. Mater., 8, 1840 (1996)