| 研究生: |
張家憲 Chang, Chia-hsien |
|---|---|
| 論文名稱: |
各種特殊中孔洞碳材合成方法之研究 Study on Synthetic Methods of Mesoporous Carbons for Various Potential Applications |
| 指導教授: |
林弘萍
Lin, Hong-ping |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 89 |
| 中文關鍵詞: | 中孔洞碳材 、金屬氧化物 、碳材複合物 |
| 外文關鍵詞: | carbon composites, metal oxides, mesoporous carbons |
| 相關次數: | 點閱:105 下載:32 |
| 分享至: |
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孔洞性碳材因為具有廣泛的應用性,如吸附劑、固態模板、催化擔體及電極材料等,所以引起許多研究的關注。本研究以具有高表面積(900~1500 m2g-1)與大的孔洞體積(1.0~2.0 cm3g-1)之中孔洞碳材為原料,利用獨創及簡單合成方法,合成各種特殊用途之中孔洞碳材。
首先,以中孔洞碳材當固態模板,含浸各種金屬前驅物,因為中孔洞碳材的存在,金屬前驅物被限制於孔道間,經過高溫煅燒,移除碳材並提昇金屬氧化物之結晶度,最後生成高結晶度、大表面積與孔體積的中孔洞金屬氧化物孔洞材料。
此外,將中孔洞碳材含浸硝酸鐵、硝酸鎳、硝酸鈷等金屬前驅物,再利用(1)氮氣環境下高溫金屬催化碳材石墨化或(2)以化學氣相沉積方式,在碳材表面生長碳管,增加碳材導電度,以利於發展導電及電容材料方面之應用。
最後,碳材中加入鐵、鈷、鎳等金屬前驅物,微波照射下生成鐵、鈷、鎳等金屬顆粒,形成磁性中孔洞碳材;加入鈦的前驅物,微波照射高溫反應下形成氧化鈦/碳材複合體。除此之外,碳材中加入鈦的前驅物及尿素,經由微波照射及鍛燒方式,生成具有吸收可見光能力之微黃色氧化鈦粉末(N-doped TiO2)。
Porous carbons with high surface area, large porosity and good electric conductivity are of great interest for its extensive applications, such as adsorbents, solid templates, catalytic supports or raw materials of electric conduction and electric capacity. In this study we present novel synthetic methods based on the mesoporous carbons to fabricate other metal and metal oxide@mesoporous carbons, mesoporous metal oxides for various potential applications.
First, we used the mesoporous carbons as solid template, by impregnating various metal precursors into the mesopores of the carbon. The metal ions or metal alkoxides was adsorbed and confined in the nanochannels of the mesoporous carbons. Then, a high-temperature calcination at 600–700oC was used to remove the carbon templates and enhance the crystallization degree. Therefore, the mesoporous metal oxides with high surface area, large pore volume and high crystalline have been efficiently prepared.
Secondly, the mesoporous carbons was impregnated with the Fe(NO3)3, Ni(NO3)2 or Co(NO3)2 salt, and then treated under different two atmosphere: (1) heated at 1000 oC under N2 to increase the graphite extent of carbons; (2) heated at 700oC under C2H2/H2 environment for chemical vapor deposition of carbon nanotubes anchored on the mesoporous carbon spheres. These two treatment procedures can enhance the electric conduction of the mesoporous carbons to extend the applications of the electric conduction and electric capacity.
In addition to the thermal treatments aforementioned, we used a fast and high-efficiency method to generate the metal or metal oxides@carbons by using microwave radiation as heating source. The Fe, Co or Ni precursors containing mesoporous carbon were subsequently exposed to an microwave oven for 5–10 min. The mesoporous carbon materials containing magnetic nanoparticles were quickly synthesized. Extending this method, we can also obtain the anatase-TiO2/Carbon composites from a fast microwave radiation of the TiO2 precursor@mesoporous carbon. To incorporate the nitrogen into the TiO2 framework, the mixture of carbons, TiO2 precursor and urea was directly exposed to microwave radiation, and then calcined at 600–700oC. The light yellow N-doped TiO2 powders which could absorb visible light were easily produced.
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