十二基化单壁碳纳米管的结构分析
Feng Liang1, Lawrence B Alemany, Jonathan M Beach
1Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA.
Journal of the American Chemical Society
|October 6, 2005
概括
使用金属 (如,或) 的单壁碳纳米管 (SWNT) 的化产生可溶性,功能化的纳米管. 金属的选择显著影响脱基化温度和由此产生的纳米管结构.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 纳米技术纳米技术
背景情况:
- 单壁碳纳米管 (SWNTs) 由于聚合而难以加工.
- 功能化可以提高SWNT在有机溶剂中的可溶性和可加工性.
- 性金属间接提供了侧墙功能化的潜在途径.
研究的目的:
- 为了研究不同金属 (,,) 对SWNTs侧壁化的影响.
- 描述由此产生的功能化SWNT及其热性质.
- 了解金属的选择如何影响脱基化过程和潜在的添加模式.
主要方法:
- 在液态氨中使用,或制备SWNT盐.
- 化SWNT盐与1 - 多德.
- 使用原子力显微镜 (AFM),传输电子显微镜 (TEM),热重量测量分析与里埃变换红外光谱学 (TGA-FTIR) 以及固态13CNMR的特性.
- 对脱基化行为进行热分析.
主要成果:
- 使用Li,Na和K.成功制备了侧墙功能化,可溶性SWNT.
- 由于金属间隙,观察到SWNT绳子的广泛解开.
- 观察到截然不同的热脱基化概况:Li-SWNTs在180-330°C,Na-SWNTs在380-530°C,K-SWNTs在180-500°C以上.
- 固态13CNMR光谱表明,根据使用的金属,基组的加法模式 (1,2-vs. 1,4-) 有差异.
结论:
- 在SWNT化中金属的选择显著影响了功能化纳米管的热稳定性和脱温度.
- 金属的插入导致SWNT绳子的有效解锁,提高溶解度.
- 观察到的脱基化温度和NMR光谱的差异可能表明1,2-和1,4-基化的不同程度,为调整SWNT特性提供了一种方法.
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