Functionalization of single-walled carbon nanotubes with well-defined polystyrene by "click" coupling
Functionalization of single-walled carbon nanotubes with well-defined polystyrene by "click" coupling
复制标题
DOI：
10.1021/ja054958b
复制
发表时间：
2005-10-19
影响因子：
15
通讯作者：
Adronov, A
中科院分区：
文献类型：
--
作者：
Li, HM;Cheng, FO;Adronov, A
通过Cu（I）催化的[3 + 2] Huisgen环加成反应，将炔修饰的单壁碳纳米管与定义明确的叠氮化物封端的聚苯乙烯聚合物共价官能化。发现该反应在制备有机可溶性聚合物-纳米管缀合物方面极其有效，即使在相对低的反应温度（60 ° C）和短的反应时间（24小时）下也是如此。发现当在1，8-二氮杂双环[5.4.0]十一碳-7-烯作为添加剂的存在下使用CuI催化剂时，反应最有效。利用IR光谱跟踪单壁碳纳米管上炔基的引入和消耗，并且拉曼光谱证明在炔引入期间高比例的sp（2）碳向sp（3）杂化的转化。热重分析表明，聚合物官能化的SWNT由45%的聚合物组成，根据聚合物分子量，每200-700个碳纳米管约有一个聚合物链。透射电子显微镜和原子力显微镜被用来成像聚合物官能化的单壁碳纳米管，显示相对均匀的聚合物涂层存在于单个的，解开的纳米管的表面上。
Covalent functionalization of alkyne-decorated SWNTs with well-defined, azide-terminated polystyrene polymers was accomplished by the Cu(I)-catalyzed [3 + 2] Huisgen cycloaddition. This reaction was found to be extremely efficient in producing organosoluble polymer-nanotube conjugates, even at relatively low reaction temperatures (60 degrees C) and short reaction times (24 h). The reaction was found to be most effective when a Cul catalyst was employed in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene as an additive. IR spectroscopy was utilized to follow the introduction and consumption of alkyne groups on the SWNTs, and Raman spectroscopy evidenced the conversion of a high proportion of sp(2) carbons to sp(3) hybridization during alkyne introduction. Thermogravimetric analysis indicated that the polymer-functionaiized SWNTs consisted of 45% polymer, amounting to approximately one polymer chain for every 200-700 carbons of the nanotubes, depending on polymer molecular weight. Transmission electron microscopy and atomic force microscopy were utilized to image polymer-functionalized SWNTs, showing relatively uniform polymer coatings present on the surface of individual, debundled nanotubes.