Sainsbury, T; Passarelli, M; Naftaly, M; Gnaniah, S J P; Spencer, S J; Pollard, A J (2016) Covalent carbene functionalization of graphene: towards chemical band gap manipulation. ACS Appl. Mater. Interfaces, 8 (7). pp. 4870-4877.

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Abstract

In this work we employ dibromocarbene (DBC) radicals to covalently functionalize solution-exfoliated graphene via the formation of dibromocyclopropyl adducts. This is achieved using a basic-aqueous/organic bi-phasic reaction mixture to decompose the dibromocarbene precursor, bromoform, in conjunction with a phase transfer catalyst to facilitate ylide formation and carbene migration to graphene substrates. DBC-functionalized graphene (DBC-graphene) was characterized using a range of spectroscopic and analytical techniques to confirm the covalent nature of functionalization. Modified optical and electronic properties of DBC-graphene were investigated using UV-vis spectroscopy, analysis of electrical I-V transport properties and using non-contact terahertz time-domain spectroscopy (TTDS). The implications of the carbene functionalization of graphene are considered in the context of scalable radical functionalization methodologies for bulk-scale graphene processing and controlled band-gap manipulation of graphene.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Identification number/DOI:	10.1021/acsami.5b10525
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7013

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