Pramoda K, Kumar Ram, Rao C N R
New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Center of Excellence in Chemistry, Sheikh Saqr Laboratory and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-, 560064, India.
Chem Asian J. 2015 Oct;10(10):2147-52. doi: 10.1002/asia.201500627. Epub 2015 Aug 12.
Composites of graphene and single-walled carbon nanotubes (SWNT) have been generated by covalent cross-linking through two different coupling strategies, namely Sonogashira and EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) coupling reactions. The obtained assemblies have been characterized by various microscopic and spectroscopic techniques. The assemblies obtained by Sonogashira coupling exhibit high surface area, the value increasing with the graphene content. The highest surface area obtained is 1260 m(2) g(-1) in the composition with highest graphene content (graphene:SWNT 1:4). These composites show a uniform slit-shaped porous network with pores of approximately 1-2 nm. CO2 uptake of this assemblies is in the range 11-15 wt % at 273 K (1 atm) and 9-11 wt % at 298 K (1 atm), whereas the H2 uptake is in the 1-1.3 wt % range at 77 K (1 atm). The composites generated by Sonogashira coupling show superhydrophobicity with high contact angles in the range from 159-163°. The EDC-coupled composites show less surface area than the composites from Sonogashira coupling.
通过两种不同的偶联策略，即Sonogashira和EDC（1-乙基-3-（3-二甲基氨基丙基）碳二亚胺）偶联反应，实现了石墨烯与单壁碳纳米管（SWNT）的共价交联，从而制备出了复合材料。所得的组装体已通过各种显微镜和光谱技术进行了表征。通过Sonogashira偶联得到的组装体具有高比表面积，该值随石墨烯含量的增加而增大。在石墨烯含量最高的组合物（石墨烯：SWNT 1:4）中，获得的最高比表面积为1260 m² g⁻¹。这些复合材料显示出均匀的狭缝状多孔网络，其孔径约为1-2 nm。该组装体在273 K（1 atm）下的CO₂吸附量在11-15 wt％范围内，在298 K（1 atm）下为9-11 wt％，而在77 K（1 atm）下的H₂吸附量在1-1.3 wt％范围内。通过Sonogashira偶联生成的复合材料表现出超疏水性，接触角在159-163°范围内。与通过Sonogashira偶联得到的复合材料相比，通过EDC偶联得到的复合材料的比表面积较小。
