Introducing Functionality by Graphene Covalent Grafting

0482802 - ÚFCH JH 2019 RIV CZ eng C - Conference Paper (international conference)
Kovaříček, Petr - Kalbáč, Martin
Introducing Functionality by Graphene Covalent Grafting.
Nanocon 2017 : conference proceedings : 9th International Conference on Nanomaterials - Research & Application. Ostrava: Tanger Ltd., 2018, s. 33-39. ISBN 9788087294819.
[NANOCON 2017. International Conference on Nanomaterials - Research & Application /9./. Brno (CZ), 18.10.2017-20.10.2017]
R&D Projects: GA MŠMT LL1301; GA MŠMT(CZ) LM2015073
Grant - others:GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_013/0001821
Institutional support: RVO:61388955
Keywords : graphene * covalent functionalization * PEDOT
OECD category: Physical chemistry

Graphene is a material of great potential in a broad range of applications, for each of which specific tuning of the material’s properties is required. This can be achieved, for example, by covalent functionalization. We have exploited protocols for surface grafting by diazonium salts, by nucleophilic and electrophilic substitution to perform graphene covalent modification of graphene on substrates. The painstaking analysis problem of monolayered materials was addressed using Raman spectroscopy, SERS, SEIRA, MS, AFM, XPS and SEM/EDX. The covalent grafting was shown to tolerate the transfer process, thus allowing ex post transfer from copper to other substrates. Functional devices often require combination of several materials with specific functions, such as graphene-polymer hybrid heterostructures. We have used the developed methodology of chemical functionalization for preparation of PEDOT:Graphene bilayers by selective in situ polymerization of EDOT on covalently functionalized graphene. The polymerization proceeds exclusively on the grafted graphene, and patterned structures with high spatial resolution down to 3 μm could have been prepared. The composite exhibits enhanced efficiency of electrochemical doping compared to pristine graphene, unsymmetrical transport characteristic with very good hole-transporting properties and efficient electronic communication between the two materials. The covalent functionalization of graphene thus introduces advanced functionality to the material, broadening its scope of applications.
Permanent Link: http://hdl.handle.net/11104/0284848