Critical Investigation of Defect Site Functionalization on Single-Walled Carbon Nanotubes
Critical Investigation of Defect Site Functionalization on Single-Walled Carbon Nanotubes
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DOI：
10.1021/cm101978m
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发表时间：
2011-01-11
影响因子：
8.6
通讯作者：
Giordani, Silvia
中科院分区：
文献类型：
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作者：
Del Canto, Elisa;Flavin, Kevin;Giordani, Silvia
硝酸处理的单壁碳纳米管（SWNT）样品中的羧基化碳质材料的存在下，最近带来了新的关注的过程中，这些材料的共价官能化进行。使用广泛报道的2步纯化/氧化程序，我们研究了碱处理和溶剂洗涤对单壁碳纳米管的功能化和最终性能和行为的影响。我们已经证明，使用许多光谱技术，在没有NaOH处理的情况下，COOH官能团直接引入到单壁碳纳米管上，而不仅仅是引入到样品中存在的碳质材料上。氧化材料的共价官能化也通过附接荧光探针进行了研究，并且最终，无论是用碱处理还是用溶剂洗涤，所得材料在它们的外观和性质方面都接近相同。此外，我们已经证明，使用这些纯化/氧化策略中的任一种，可以产生仍然表现出独特的光学/电子性质的功能化材料，如通过持续的结构化光谱吸收和发射特征所证明的。
The presence of carboxylated carbonaceous material in nitric acid-treated single-walled carbon nanotube (SWNT) samples has recently brought renewed focus on the processes by which covalent functionalization of such materials are carried out. Using a widely reported 2-step purification/oxidation procedure, we have investigated the effect of basic treatment and solvent washing on the functionalization and final properties and behavior of SWNTs. We have demonstrated, using a number of spectroscopic techniques, that in the absence of NaOH treatment, COOH functionality is introduced directly onto SWNTs, and not only onto carbonaceous material present in the sample. Covalent functionalization of the oxidized materials was also investigated by attachment of a fluorescent probe, and ultimately, whether treated with base or solvent washed, the resulting materials are close to identical with respect to both their appearance and properties. In addition, we have demonstrated that using either of these purification/oxidation strategies, functionalized materials can be produced that still exhibit distinctive optical/electronic properties, as demonstrated by sustained structured spectroscopic absorption and emission features.