奈米硒化鋅/奈米碳管複合材料之合成與特性分析

The synthesis and characterization of ZnSe/CNTs nanocomposites

鄭錦薏(Chin-Yi Cheng)

指導教授 ： 林鴻明

大同大學/工程學院/材料工程學系所/碩士(2007年)

摘要

本研究以酸洗後之多壁奈米碳管為載體，於液相中以硒與鋅之粉末為前驅物，藉由硬X光輻射及水熱合成法，合成奈米硒化鋅/奈米碳管的複合材料。此奈米複合材料經過X光繞射儀、掃描式電子顯微鏡、穿透式電子顯微鏡、高解析度穿透式電子顯微鏡、拉曼散射儀及光激發光譜儀進行分析，以觀察其結晶結構、表面型態、界面型貌以及光學性質。
研究結果顯示，在室溫下可以藉由硬X光輻射法於奈米碳管表面生成10至15奈米的硒化鋅顆粒。此外，利用水熱法的高壓環境與前驅物濃度的控制，亦能夠在較一般製程低的溫度下生成不同粒徑範圍的奈米硒化鋅顆粒。
本研究中，二階段式水熱法亦被提出用來合成奈米硒化鋅/奈米碳管的複合材料。液相中之鋅離子先與奈米碳管形成各個成核點，再藉由這些成核點於奈米碳管表面形成10奈米以下的硒化鋅。經過分析比較，二階段式水熱法為本研究中生成奈米硒化鋅/奈米碳管複合材料的最佳製程方法。

關鍵字

奈米

並列摘要

In this study, ZnSe/MWCNTs nanocomposites were synthesized by hard X-ray irradiation and hydrothermal method in liquid phase with precursors of Zn and Se powders and substrates of purified MWCNTs. The nanocomposites were analyzed by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy and photoluminescence spectroscopy (PL) to investigate the crystal structures, surface morphologies, interfaces and optical properties of them.
According to the results, the particle sizes of the solution irradiation by hard X-ray at room temperature were about 10-15 nm. On the other hand, different sizes of nano ZnSe particles could be also synthesized with the control of precursors under high pressure of hydrothermal method at lower temperature.
In this study, two-step hydrothermal method was proposed to synthesize ZnSe/MWCNTs nanocomposites. This method could produce more quantum dots on the surface of MWCNTs with particle size less than 10 nm. It may confirm the assumption that Zn can form a nucleation site on the surface of MWCNTs to enhance the nucleation of ZnSe. Two-step hydrothermal method is the most adequate synthesis method of ZnSe/MWCNTs in this study.

並列關鍵字

nano

參考文獻

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