可被可見光激發之半導體材料製備

Fabrication of visible-excitable semiconductor nanomaterials

王志祺(Chih-Chi Wang)

指導教授 ： 黃國柱

國立清華大學/理學院/化學系/碩士(2011年)

https://doi.org/10.6843/NTHU.2011.00241

摘要

在二氧化鈦各式各樣的應用上，我們選擇利用電紡絲技術製備成
奈米纖維薄膜的形式，並利用改質高分子溶液及表面修飾金屬奈米顆
粒的方式，使其對可見光具有一定的吸收度；此外，也以電紡絲製備
二氧化矽纖維，再將其作為模板，利用化學氣相沉積法在其表面覆蓋
上一層高單晶的二氧化鈦殼層，並調控氣相沉積過程中的參數，可達
到控制此殼層的厚薄程度。最後將此薄膜纖維利用 ITO 玻璃製備為簡易元件，並以雷射及 Xenon lamp 作為光源，測定其光電流之響應訊號。從實驗結果可以知道，無論是用表面及結構改質方式所製備之二氧化鈦纖維，利用吸收光譜儀得知於可見光區的吸收皆有一定程度增強，在光電流部分，相對於未改質的二氧化鈦也可比較出其可見光下響應的差異性。

關鍵字

電紡絲 ； 奈米纖維 ； 二氧化鈦

並列摘要

In various applications of titania, we fabricate it to be a nanofibers thin film by electrospinning. In order to increase its absorption in the visible light, we use nanofibers loaded with noble metal nanoparticles and transform the characteristic of the precursor solution which used in the electrospinning process. Besides,we also electrospun silica nanofibers to be a template for coating titania shell on the surface. By controlling CVD process parameters, we can make this titania shell not only fine or bad crystalline but different thickness. To measure the photo-current response, we design a simple device made by ITO glass then we choose the laser and Xe lamp to be light source for a fixed or full wavelength photo-current measurement. By modifying the surface or transform the nature structure, we can get the titania with stronger absorption in the visible light range. In the visible light-photo current response, it was also easily to find the difference of titania fiber between with or without modifying.

並列關鍵字

Electrospinning ； Nanofibers ； Titania

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