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- Title
Remarkable Improvement in the Mechanical Properties and CO<sub>2</sub> Uptake of MOFs Brought About by Covalent Linking to Graphene.
- Authors
Kumar, Ram; Raut, Devaraj; Ramamurty, Upadrasta; Rao, C. N. R.
- Abstract
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=Mg2+, Ni2+, or Co2+, DOBDC=2,5-dioxido-1,4-benzene dicarboxylate) MOFs. The surface area of the graphene-MOF composites increases up to 200-300 m2 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.
- Subjects
GRAPHENE synthesis; MECHANICAL behavior of materials; METAL-organic frameworks; GAS absorption &; adsorption; POROUS materials synthesis; CARBON dioxide; COVALENT bonds; ELASTIC modulus
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 27, p7857
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201603320