単一壁の炭素ナノチューブの共性サイドウォールの機能化
Rajesh K Saini1, Ivana W Chiang, Haiqing Peng
1Center for Nanoscale Science and Technology, Rice Quantum Institute, Department of Chemistry, Rice University, Houston, Texas 77005, USA.
Journal of the American Chemical Society
|March 20, 2003
まとめ
アルキル基は,アルキルリチウム反応剤を使用して,フッ素ナノチューブに結合することができます. 直径が小さいナノチューブはより容易に機能し,このアルキル化は500°Cで逆行する.
科学分野:
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
- 有機化学 オーガニック・ケミストリー
背景:
- 炭素ナノチューブの機能化は,それらの特性を調整するために不可欠です.
- アルキルリチウム反応剤は,酸化単壁炭素ナノチューブ (SWNTs) のサイドウォール改変のための経路を提供します.
研究 の 目的:
- フッ素SWNTのアルキル化程度を定量的に測定する.
- 異なる方法によって準備されたSWNTのアルキル化効率を比較する.
- アルキル化プロセスの熱安定性と可逆性を調査する.
主な方法:
- アルキルリチウム反応剤を用いたフッ素SWNTのアルキル化.
- 定量的な機能化評価のためのUV対NIRスペクトロスコーピーと組み合わせた熱重量測定分析 (TGA).
- アルゴンの大気中の熱分解に続いてTGA-質量スペクトロメトリ (TGA-MS) 分析.
主要な成果:
- サイドウォールのアルキル化度の定量的な測定は,TGA-UV-VIS-NIR.を使用して達成されました.
- HiPco法で生産されたSWNTは,レーザーオーブンで生産されたSWNTと比較して,より高いアルキル化効率を示しました.
- アルキル化の可逆性が実証され,アルゴンで500°Cまで加熱した後に原始的なSWNTスペクトルシグネチャが回復しました.
- n-ブチル化SWNTのTGA-MS分析により,1-ブテンとn-ブタンが熱分解産物として特定されました.
結論:
- アルキルリチウム反応剤は,フルオロ SWNT サイドウォールを効果的に機能化します.
- HiPco のような直径が小さいSWNTは,より容易にアルキル化されます.
- アルキル化プロセスは熱的に可逆であり,原始的なSWNT特性の潜在的再生を可能にします.
- 脱基化製品の理解は,機能化の安定性についての洞察を提供します.
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