靜電紡絲法製備碳摻雜之二氧化鈦奈米纖維性質研究

Properties of Carbon-doped TiO2 Nanofiber by Electrospinning

陳昱旻(Yu-Min Chen)

指導教授 ： 鍾卓良

義守大學/理工學院/材料科學與工程學系/碩士(2016年)

摘要

在本研究中，我們利用靜電紡絲製備二氧化鈦摻碳奈米纖維。我們利用殼聚糖與葡萄糖作為碳來源，摻雜後的二氧化鈦奈米纖維隨後將送入爐體中進行500oC及600oC。鍛燒後的二氧化鈦奈米纖維性質將會改變。
　　奈米纖維將會進行一連串的分析，如X-ray繞射儀、場發式電子顯微鏡、紫外光-可見光光譜儀、熱重損失分析儀等。我們使用X-ray繞射儀做奈米纖維之相鑑定；使用場發式電子顯微鏡觀察奈米纖維之表面形貌；最後使用紫外-可見光光譜儀觀察其光學性質。
　　利用SEM來觀察發現95%的酒精當作溶劑，纖維上會有許多豆狀物；使用99.7%的酒精當作溶劑時則無。在相同的抽絲條件之下，使用殼聚糖所製備出的纖維直徑會比較粗且均勻。使用葡萄糖的系統，抽絲不穩定，產生的纖維直徑分布較寬廣。殼聚糖系統中，600oC燒結與500oC之纖維直徑比較，由231 nm變為193 nm，而晶粒尺寸變大從13.80 nm變為20.70 nm；葡萄糖系統高溫燒結後較細的纖維，平均纖維直徑會變大由135 nm變為299 nm，600oC高溫燒結晶粒尺寸由500oC的16.56 nm變為20.70 nm。討論XRD圖的現象，因殼聚糖的分子量較高耐溫性較好，在高溫時對晶粒形成干擾較高。發現CGt600-TiO2雖然也有金紅石相的產生，但是明顯的峰的數量與峰值明顯比同樣經過600oC鍛燒的CG600-TiO2還不明顯。透過熱重損失分析儀可發現殼聚糖分子量較高耐熱性較好殘留在TiO2纖維中較多，相對TiO2晶體形成干擾較大。形成的晶粒大小在添加葡萄糖與殼聚糖的系統分別為16.56 nm及13.80 nm。

關鍵字

靜電紡絲 ； 殼聚糖 ； 葡萄糖 ； 奈米纖維

並列摘要

In this study, C-doped TiO2 nanofibers were fabucated by electrospinning. The carbon was added into the nanofibers by using chitosan and glucose. With doped carbon from Chitosan and Glucose and fibers were calcined at 500oC, and then the optical characteristics of C-doped TiO2 nanofibers has been changed.
Nanofibers were analyzed by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), UV-vis, and Thermogravimetric Analysis(TGA). XRD was applied to identify phase composition of nanofibers. The morphology of nanofibers were explored by FE-SEM. Optical characteristics of absorption were measured by UV-vis. We scanned the surface and then it showed the 3D graphics of C-doped TiO2 nanofibers, and observed the effects of different processes for nanofibers by AFM.
The XRD results showed phase of C-doped TiO2 nanofibers were transformed successfully from rutile phase to anatase phase. Images from and FE-SEM displayed the average size of nanofibers. UV-vis results revealed that the properties of TiO2. Finally, we found out the surface of C-doped TiO2 nanofibers can be changed after the heat treatment.

並列關鍵字

electrospinning ； chitosan ； glucose ； TiO2 ； nanofibers

參考文獻

[01] Kwang-Il Choi, Suk Ho Lee, Ju-Young Park, Do-Young Choi, Cheol-Ho Hwang, In-Hwa Lee, Mi Hwa Chang “Fabrication and characterization of hollow TiO2 fibers by microemulsion electrospinning for photocatalytic reactions” ScienceDirect, Materials Letters 112 (2013) pp.113-116.

[02] Li D, Xia Y. “Nano Letters”, 2003;3 pp.555-60.

[03] Park JY, Lee IH. “Journal of Nanoscience and Nanotechnology” 2010;10:pp.3402-5.

[04] Yuan Feng, Judy N. Hart, Robert J. Patterson, Adrian Lowe“Electrospinning of TiO2 nanofibers: theinfluence of Li and Ca doping and vacuumcalcination” ScienceDirect, Materials Letters 139 (2015) pp.31-34.

[05] Gao B, Peng C, Chen GZ, Puma GL. “Photo-electro-catalysis enhancement on carbon nanotubes/titanium dioxide (CNTs/TiO2) composite prepared by a novel surfactant wrapping sol-gel method” Appl Catal B-Environ 2008;85:pp.17-23.