本研究藉由不同酸作為氧化劑，對奈米碳管進行純化程序，以了解純 化程序對於奈米碳管表面特性造成的改變。利用不同的分析儀器，針對純 化前後之奈米碳管，進行一連串定性分析，如 TGA、Raman spectroscopy、
SEM、BET、FTIR 等，依據分析的結果，以了解奈米碳管表面特性的變化。
5-1 結論
1. 奈米碳管經硝酸純化後，表面碳不純物與金屬觸媒顆粒經硝酸氧化去 除，使得熱重量分析結果，僅剩下奈米碳管重量損失的波峰；純化後 碳管的 G/D 值大於純化前之 G/D 值，顯示奈米碳管經硝酸純化後純度 大幅提升；在表面積與微孔體積部份，硝酸有效打開碳管封閉的兩端，
使得表面積與微孔體積增加；硝酸分子與表面碳原子作用形成含氧官 能基。
2. 鹽酸純化後奈米碳管，經熱重量分析儀與拉曼光譜儀分析顯示，鹽酸 氧化金屬鎳、釔與碳不純物的能力較差，使得碳管的純度無法有效提 升；比較純化前後管外表面積，鹽酸純化後管外表面積與純化前相較 之下來的大，顯示大量的不純物仍存在於碳管上；純化後碳管表面產 生含氧官能基，增加了碳管的極性。
較，純化後碳管的 G/D 值較純化前小，隨著過氧化氫水溶液增加，其 G/D 值降低；表面積與微孔體積隨著過氧化氫水溶液的濃度增加而增 加；過氧化氫水溶液分子與碳管表面碳原子作用並在缺陷處產生官能 基。
4. 不論以硝酸、鹽酸或過氧化氫水溶液純化奈米碳管，純化後碳管表面 積與微孔體積皆有增加的趨勢(9M 硝酸例外)，並於表面產生含氧官能 基。結果顯示，以硝酸氧化碳管表面金屬顆粒與碳不純物的效果為最 好，並能有效增加表面積與微孔體積。
5-2 建議
1. 文獻指出，加熱溫度不同，對純化後奈米碳管的特性也不同，以硝酸 作為氧化劑，不論在純度與表面積的變化皆優於鹽酸及過氧化氫水溶 液，可針對硝酸作進一步的研究，改變加熱溫度及迴流時間，觀察純 化條件改變對奈米碳管表面特性的影響。
2. 奈米碳管之拉曼光譜，在 D-band 模式部分，造成此處波峰形成的原 因，不單是碳不純物造成，需進一步釐清碳不純物與碳管缺陷處的影 響。
3. 對於純化前後奈米碳管微孔分布的變化，其理論機制並不清楚，未來 需進一步釐清，以瞭解純化過程，氧化劑的作用對奈米碳管所造成的 影響。
參考文獻
[1] S. Iijima,“Helicalmicrotubules of graphitic carbon,”Nature, 354, pp.56 (1991).
[2] 李元堯，｢21 世紀的尖端材料-奈米碳管｣，化工技術，第 11 卷第 2 期，
第 140-159 頁，2003。
[3] 洪昭南、徐逸明、王宏達，｢奈米碳管結構及特性簡介｣，化工，第 49 卷第 1 期，第 23-30 頁，2002。
[4] 王裕祥，｢利用高分子材料及電弧放電法製造奈米碳管｣，碩士論文，
中正大學化學工程研究所，嘉義，2002。
[5] 化工產業技術知.網: http://www.chemtech.com.tw
[6] 黃建良、黃淑娟，｢奈米碳纖與奈米碳管合成技術簡介｣，化工，第50 卷第2 期，第18 至25 頁，2003。
[7] M. Yudasaka, ”Mechanism of the effect of NiCo Ni and Co catalysts on the yield of single-wall carbon nanotubes forced by pulsed Nd：YAG laser ablation ,”Journal of Physical Chemistry B, 103, pp.11-17 (1999).
[8] F Kokai, ”Synthesis of single-wall carbon nanotubes by millisecond-pulsed CO2laser vaporization at room temperature,”Chemical Physics Letters, 316, pp.11-17 (2000).
[9] Z.W. Pan, S.S. Xie, B.H. Chang, L.F. Sun, and W.Y. Wang, ”Direct growth of aligned open cabon nanotubes by chemical vapor deposition”Chemical
methane for single-walled carbon nanotubes”Chemical Physics Letters, 292, pp 567-574 (1998).
[11] A. C. Dillon, K. M. Jones, and T. A. Bekkedahl, “Storage of hydrorgen in single-walled carbon nanotubes.”Nature, 386, pp.377-379 (1997).
[12] Sander J. Tans, Alwin R. M. Verschueren, and Cees Dekker,
“Room-temperature transistor based on a single carbon nanotube,” Nture, 393, pp.49-51 (1998).
[13] Dengsong Zhang, Liyi Shi, Jianhui Fang, and Kai Dai, “NaCl adsorption from saltwater solution using carbon nanotubes/activated carbon
composite electrode,”Materials Letters, 60, pp.360-363 (2006).
[14] Kai Dai, Liyi Shi, Dengsong Zhang, and Jianhui Fang, “NaCl adsorption in multi-walled carbon nanotubes/activated carbon combination
electrode,”Chemical Engineering Science, 61, pp.428-433 (2006).
[15] Fu-Hsiang Ko, Chung-Yang Lee, Chu-Jung Ko, and Tieh-Chi Chu,
“Purification of multi-walled nanotubes through microwave heating of nitric acid in a closed vessel,”Carbon, 43, pp.727-733 (2005).
[16] Avetik R. Harutyunyan, Bhabendra K. Pradhan, Jiping Chang, Gugang Chen,and PeterC.Eklund,”Purification ofsingle-walled carbon nanotubes by selective microwave heating of catalyst particles,” Carbon,106, pp.8671-8675 (2002).
[17] Konstantin B. Shelimov, Rinat O. Esenaliev, Andrew G. Rinzler, and Chad B.Huffman,“Purification ofsingle-walled carbon nanotubes by ultrasonically assisted filtration,”Chemical Physics Letters, 282,
pp.429-434 (1998).
[18] L. S. K. Pang, J. D. Saxby, and S. P.Chatfield,“Thermogravimetric analysis of carbon nanotubes and nanoparticles,“Journal of Physical Chemistry, 27, pp.6941-6942 (1993).
[19] S. C. Tsang, P. J. Harris, and M.L.Green,“Thinning and opening of carbon nanotubes by oxidation using carbon dioxide,”Nature, 362, 520 (1993).
[20] G. S. Duesberg, M. Burghard, J. Muster, G. Philipp, and S. Roth,
“Seperation ofcarbon nanotubes by size exclusion chromatograpgy,” Chemical Communications, 3, pp. 435-436 (1998).
[21] Yan-hui Li, Shuguang Wang, Zhaokun Luan, Jun Ding, and Cailu Xu,
“Adsorption ofcadmium(Ⅱ) from aqueous solution by surface oxidized carbon nanotubes,”Carbon, 41, pp.1057-1062 (2003).
[22] K. Hernadi, A. Siska, L. Thien-Nga, L. Forro, and I. Kiricsi,“Reactivity of different kinds of carbon during oxidative purification of catalytically prepared carbon nanotubes,”Solid State Ionics, 141-142, pp.203-209 (2001).
[23] Hui Hu, Bin Zhao, Mikhail E. Itkis, and RobertC.Haddon,“Nitricacid purification of single-walled carbon nanotubes,”Journal of Physical Chemistry B, 107, pp.13838-13842 (2003).
[24] Erik Dujardin, Thomas W. Ebbesen, Ajit Krishnan, and Michael M. J.
[25] Dengsong Zhang, Liyi Shi, Jianhui Fang, Xuanke Li, and Kai Dai,
“Preparation and modification of carbon nanotubes,”Materials Letters, 59, pp.4044-4047 (2005).
[26] X.H. Chen, C.S. Chen, Q. Chen, F.Q. Cheng, G.Zhang, and Z.Z. Chen,
“Non-destructive purification of multi-walled carbon nanotubes produced by catalyzed CVD,”Materials Letters, 57, pp.734-738 (2002).
[27] Y. Zhang, Z. Shi, Z. Gu, and S.Iijima, “Structure modification of single-wall carbon nanotubes,”Carbon, 38, pp.2055-2059 (2000).
[28] Jeong-Mi Moon, Kay Hyeok An, and Young Hee Lee, “High-yield purification process of singlewalled carbon nanotubes,”Journal of Physical Chemistry B, 105, pp.5677-5681 (2001).
[29] Iosif Daniel Rosca, Fumio Watari, Motohiro Uo, and Tsukasa Akasaka,
“Oxidation of multiwalled carbon nanotubes by nitric acid,”Carbon, 43(15), pp.3124-3131 (2005).
[30] Richard Q. Long,and Ralph T.Yang,“Carbon nanotube as superior sorbent for dioxin removal,”Journal of the American Chemical Society, 123, pp.2058-2059 (2001).
[31] 劉旭娟、詹舒斐、鄧宗禹、金光祖、黃志彬，｢改良式固相萃取技術應 用於超純水中鄰苯二甲酸酯類之微量分析｣，第二屆環境保護與奈米科 技學術研討會，清華大學，2005
[32] Yan-hui Li, Shuguang Wang, Anyuan Cao, Dan Zhao, Xianfeng Zhang, Cailu Xu, Zhaokun Luan, Dianbo Ruan, Ji Liang, Dehai Wu, and Bingqing Wei,“Adsorption offluoride from water by amorphous alumina
supported on carbon nanotubes,”Chemical Physics Letters, 350, pp.412-416 (2001).
[33] 許世杰、李孟珊、盧重興，｢奈米碳管吸附異丙醇廢氣之研究｣，第二 屆環境保護與奈米科技學術研討會，清華大學，2005
[34] 石立節，｢奈米碳管酸純化前後表面特性之變化｣，碩士論文，中央大 境工程研究所中壢，2005
[35] Yan-hui Li, Shuguang Wang, Jinquan Wei, Xianfeng Zhang, Cailu Xu, haokun Luan, DehaiWu,and Bingqing Wei,“Lead adsorption on carbon nanotubes,”Chemical Physics Letters, 357, pp.263-266 (2002).
[36] Yan-hui Li, Shuguang Wang, Zhaokun Luan, Jun Ding,and Cailu Xu,
“Adsorption ofcadmium(Ⅱ) from aqueous solution by surface oxidized carbon nanotubes,”Carbon, 41, pp.1057-1062 (2003).
[37] Yan-hui Li, Jun Ding, Zhaokun Luan, Zechao Di, Yuefeng Zhu, Cailu Xu, ehai Wu, and Bingqing Wei,“Competitiveadsorption of Pb2+, Cu2+
and Cd2+ions from aqueous solutions by multiwalled carbon nanotubes,”Carbon, 41, pp.2787-2792 (2003).
[38] 洪肇嘉、蔡正國、黃國軒、謝淑惠，｢複合奈米碳管吸附水溶重金屬之 反應與再生之探討｣，第三十屆廢水處理技術研討會，中壢市，2005 [39] Xiangke Wang, Changlun Chen, Wenping Hu, Aiping Ding, Di Xu, and
Xiang Zhou, “Sorption of 243Am(Ⅲ) to multiwall cabon nanotubes,”