Chemistry and Physics of Materials Unit, New Chemistry Unit, Sheikh Saqr Laboratory, International Centre for Materials Science (ICMS), CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-, 560064, India.
Department of Materials Engineering, Indian Institute of Science, Bangalore-, 560012, India.
Angew Chem Int Ed Engl. 2016 Jun 27;55(27):7857-61. doi: 10.1002/anie.201603320. Epub 2016 Jun 10.
Metal-organic frameworks (MOFs) are exceptional as gas adsorbents but their mechanical properties are poor. We present a successful strategy to improve the mechanical properties along with gas adsorption characteristics, wherein graphene (Gr) is covalently bonded with M/DOBDC (M=Mg(2+) , Ni(2+) , or Co(2+) , DOBDC=2,5-dioxido-1,4-benzene dicarboxylate) MOFs. The surface area of the graphene-MOF composites increases up to 200-300 m(2) g(-1) whereas the CO2 uptake increases by ca. 3-5 wt % at 0.15 atm and by 6-10 wt % at 1 atm. What is significant is that the composites exhibit improved mechanical properties. In the case of Mg/DOBDC, a three-fold increase in both the elastic modulus and hardness with 5 wt % graphene reinforcement is observed. Improvement in both the mechanical properties and gas adsorption characteristics of porous MOFs on linking them to graphene is a novel observation and suggests a new avenue for the design and synthesis of porous materials.
金属-有机骨架（MOFs）是出色的气体吸附剂，但它们的机械性能较差。我们提出了一种成功的策略，可改善机械性能和气体吸附特性，其中石墨烯（Gr）与 M/DOBDC（M=Mg（2+），Ni（2+）或 Co（2+），DOBDC=2,5-二氧代-1,4-苯二甲酸二酯）MOFs 发生共价键合。石墨烯-MOF 复合材料的比表面积增加至 200-300 m(2)g(-1)，而在 0.15 atm 时 CO2 吸收量增加约 3-5 wt%，在 1 atm 时增加 6-10 wt%。重要的是，复合材料表现出改善的机械性能。在 Mg/DOBDC 的情况下，观察到添加 5 wt%石墨烯增强后弹性模量和硬度分别提高了三倍。将多孔 MOFs 与石墨烯连接以改善其机械性能和气体吸附特性是一种新颖的观察结果，为多孔材料的设计和合成提供了新途径。
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