氧化鐵奈米粒之合成與其表面改質

Synthesis and Surface Modification of Iron Oxide Nanoparticles

周士富(Shih-Fu Chou)

指導教授 ： 賴志煌

國立清華大學/工學院/材料科學工程學系/碩士(2006年)

摘要

摘要
氧化鐵奈米粒之合成與其表面改質

藉由高溫的有機溶液法我們可以製備出粒徑六至十二奈米大小的氧化鐵奈米粒。這是利用改變合成的條件參數或是種晶促進長成法(seed-mediated growth)的方法來達成。剛合成出的氧化鐵奈米粒是屬於親油性的粒子，而我們可以經由表面改質的方法進一步的將其改為親水性的粒子。表面改質後的粒子在室溫下，還是具有其改質之前超順磁的性質，但是改質後的阻隔溫度(blocking temperature)卻與改質前的不同。此外我們還成功的合成出CdSe@ZnS此種量子點。所合成出量子點可以和表面改質後而具硫醇基的氧化鐵奈米粒作一個接合(coupling)的動作。由於量子點是具光學特性的材料，並配合上氧化鐵的磁性質，最後所得到的是同時具有光學及磁性的複合材料，而此種材料有機會拿來作生醫上的應用。

關鍵字

奈米粒 ； 氧化鐵 ； 量子點 ； 表面改質

並列摘要

Abstract
Synthesis and Surface Modification of Iron Oxide Nanoparticles

Iron oxide nanoparticles were synthesized via hot organic solvent system. The particles’ sizes can be tuned from 6 nm to 12 nm by varying synthetic conditions or seed-mediated growth. The as-synthesized particles are hydrophobic and can be further modified to be hydrophilic ones by surface modifications. The modified particles maintain their superparamagnetic properties under room temperature while the blocking temperature varies after surface modifications. Also we have successfully synthesized CdSe@ZnS quantum dots. The as-synthesized quantum dots are coupled with thiol-functionalized iron oxide nanoparticles. Since QDs are well known with their optical properties and iron oxide nanopartilces are magnetic materials. The resulting nanocomposites are bifunctional with magnetic and optical properties and may have an opportunity for biomedical applications.

並列關鍵字

nanoparticles ； iron oxide ； quantum dot ； surface modification

參考文獻

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