利用熱蒸鍍法合成氧化釩及摻雜鋁之氧化釩一維奈米結構與其性質分析

Formation, Characterization and properties of un-doped and Al-doped vanadium oxide 1-D nanostructures by thermal evaporation

蘇育群(Yu-Chun Su)

指導教授 ： 施漢章 ； 葉均蔚

國立清華大學/工學院/材料科學工程學系/碩士(2008年)

摘要

本實驗利用五氧化二釩及鋁粉末在水平爐管中作為蒸鍍源，成功的利用熱蒸鍍法合成出未摻雜及摻雜鋁的五氧化二釩一維奈米結構，從場發射掃描電子顯微鏡(FESEM)觀察到我們合成出的是奈米棒結構，其寬度大約介於50~100nm而長度大約在數個微米，再利用高解析穿透式電子顯微鏡(HRTEM)以及電子選區繞射(SAED)圖形確認其為五氧化二釩的單晶結構，並定義出晶面方向及成長方向為[020]。除此之外，更利用X光繞射儀、X光電子能譜術(XPS)、EDS、微拉曼光譜，對其結構與成分甚至是化學態做更進一步的分析。
另外，我們分別在光激發光譜(PL)、電壓電流曲線和氣體感測上來比較奈米棒在摻雜鋁之後的變化，摻雜鋁之後的五氧化二凡奈米棒的發光位置從650nm藍移到610nm，並且因為鋁的摻雜造成單根奈米棒電阻率的上升，在酒精感測的敏感度也因為鋁的摻雜產生了變化。

關鍵字

熱蒸鍍 ； 氧化釩

並列摘要

In this work, pure V2O5 and Al-doped V2O5 1-D nanostructures have been synthesized by thermal evaporation. The nanostructures were successfully synthesized with horizontal tube furnace by using vanadium pentoxide and aluminum powder. The morphology of nanostructures was analyzed by field emission scanning electron microscope (FESEM). It is shown that the appearance of nanostructures is nanorods with diameter ranging between 50 and 200 nm and with lengths extending up to several microns. High resolution transmission electron microscopy (HRTEM) micrographs and selection area electron diffraction (SAED) patterns of V2O5 nanorods clearly show that they are single-crystalline with a growth direction of [020]. The structures and component were characterized by means of X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and Micro-Raman Spectroscopy.
The properties of Al-doped and un-doped V2O5 nanorods were investigated by Photoluminescence (PL), I-V curve and gas sensor. The pure V2O5 nanorods gave emission~650 nm but the emission of Al-doped V2O5 nanorods blue shifted to 610nm. The resistivity of the single nanorods increasing is result of aluminum doping. Furthermore,aluminum addition adjusted the sensitivity of nanorods.

並列關鍵字

thermal evaporation ； vanadium oxide

參考文獻

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