International Center for Material Science

Bangalore, India

International Center for Material Science

Bangalore, India
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Kumar R.,International Center for Material Science | Jayaramulu K.,International Center for Material Science | Maji T.K.,International Center for Material Science | Rao C.N.R.,International Center for Material Science | Rao C.N.R.,CSIR - Central Electrochemical Research Institute
Chemical Communications | Year: 2013

Hybrid nanocomposites of graphene oxide (GO) with ZIF-8 exhibit tunable nanoscale morphology and porosity, both determined by the GO content, coordination modulation being responsible for such properties. These materials also give rise to high CO2 storage capability and can be used as precursors to prepare GO@ZnS nanocomposites. This journal is © The Royal Society of Chemistry.


Kumar R.,International Center for Material Science | Jayaramulu K.,International Center for Material Science | Maji T.K.,International Center for Material Science | Rao C.N.R.,International Center for Material Science | Rao C.N.R.,CSIR - Central Electrochemical Research Institute
Dalton Transactions | Year: 2014

Homogeneous graphene-MOF composites based on a 2D pillared-bilayer MOF (Cd-PBM), {[Cd4(azpy)2(pyrdc)4(H 2O)2]·9H2O}n (azpy = 4,4′-azopyridine, pyrdc = pyridine-2,3-dicarboxylate), have been synthesized, using both graphene oxide (GO) and benzoic acid functionalized graphene (BFG). The composites GO@Cd-PBM and BFG@Cd-PBM demonstrate growth of the 2D nano-sheets of MOF on the graphene surface. While the pristine MOF, Cd-PBM shows selective CO2 uptake with a single-step type-I adsorption profile, the composites show stepwise CO2 uptake with a large hysteresis. With H2O and MeOH, on the other hand, the composites show a single-step adsorption unlike the parent MOF. This journal is © the Partner Organisations 2014.


Kumar R.,International Center for Material Science | Suresh V.M.,International Center for Material Science | Maji T.K.,International Center for Material Science | Rao C.N.R.,International Center for Material Science | Rao C.N.R.,Jawaharlal Nehru Centre for Advanced Scientific Research
Chemical Communications | Year: 2014

We report the design and synthesis of two porous graphene frameworks (PGFs) prepared via covalent functionalization of reduced graphene oxide (RGO) with iodobenzene followed by a C-C coupling reaction. In contrast to RGO, these 3D frameworks show high surface area (BET, 825 m2 g-1) and pore volumes due to the effect of pillaring. Interestingly, both the frameworks show high CO2 uptake (112 wt% for PGF-1 and 60 wt% for PGF-2 at 195 K up to 1 atm). PGFs show nearly 1.2 wt% H2 storage capacity at 77 K and 1 atm, increasing to ∼1.9 wt% at high pressure. These all carbon-based porous solids based on pillared graphene frameworks suggest the possibility of designing related several such novel materials with attractive properties. © 2014 The Royal Society of Chemistry.


PubMed | International Center for Material Science
Type: Journal Article | Journal: Chemical communications (Cambridge, England) | Year: 2013

Hybrid nanocomposites of graphene oxide (GO) with ZIF-8 exhibit tunable nanoscale morphology and porosity, both determined by the GO content, coordination modulation being responsible for such properties. These materials also give rise to high CO2 storage capability and can be used as precursors to prepare GO@ZnS nanocomposites.

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