Dibromocarbene functionalization of boron nitride nanosheets: Toward band gap manipulation and nanocomposite applications
Citation:
Sainsbury,Toby, O'Neill,Arlene, Passarelli,Melissa K., Seraffon,Maud, Gohil,Dipak D.., Gnaniah,Sam J P., Spencer,Steven J., Rae,Alasdair, Coleman,Jonathan N., Dibromocarbene functionalization of boron nitride nanosheets: Toward band gap manipulation and nanocomposite applications, Chemistry of Materials, 26, 24, 2014, 7039-7050Download Item:
Abstract:
We report the covalent functionalization of exfoliated boron nitride nanosheets (BNNSs) using dibromocarbene (DBC) species. The functionalization of BNNSs is enabled as the nanosheets are utilized as 2-dimensional (2-D) phase-transfer catalysts (PTC) for the migration of carbenes across the organic-aqueous phase boundary. We postulate that BNNSs stabilize carbenes by forming B-CBr2 ylides and in-turn act as the reaction substrate. DBC functionalization of BNNSs results in the formation of B-C and B-N bonds to the sp2 hybridized BNNS lattice via the formation of dibromo-bridged bicyclo BCN systems. The covalent functionalization was characterised using HR-TEM, AFM, EELS, XRD, EDX, ToF-SIMS, TGA, Raman, XPS, FTIR, and UV-Vis techniques. Utilization of CBr2 groups as a means by which BNNSs may be integrated and interfaced with solvents, molecular and condensed phase materials was demonstrated by grafting alkyl chains from the functional groups via alkyl/halogen exchange. Alkyl-functionalized BNNSs were integrated within polyethylene (LDPE) and extruded to form BNNS-nanocomposite fibres. Implications of the covalent functionalization of h-BN are considered in the context of band-gap manipulation and the versatility of the CBr2 functional groups to enable subsequent chemical derivatization.
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http://people.tcd.ie/colemajDescription:
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Author: COLEMAN, JONATHAN
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Chemistry of Materials26
24
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http://dx.doi.org/10.1021/cm503475tMetadata
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