Nistal, A;
Garcia, E;
Perez-Coll, D;
Prieto, C;
Belmonte, M;
Osendi, M;
Miranzo, P;
(2018)
Low percolation threshold in highly conducting graphene nanoplatelets/glass composite coatings.
Carbon
, 139
pp. 556-563.
10.1016/j.carbon.2018.07.030.
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Abstract
Thermal sprayed thick glass coatings with a small percentage of multilayer graphene nanoplatelets (GNP) demonstrate electrical functionality with a quite remarkable low percolation limit (1.18 vol.%). This low critical content and the high electrical conductivity (∼40 S m−1) observed for the in-plane direction are related to the peculiar coating microstructure, formed by the pileup of lamellar amorphous particles decorated by GNP mostly following a surface parallel orientation. The general effective media model fitting to the electrical conductivity data for these coatings suggests a 3D connectivity of graphene and estimates an upper limit conductivity for the GNP of 105 S m−1. Hall effect shows the n-type behavior intrinsic to the SiO2/graphene interface, and carrier density and mobility rising with the GNP content. In addition, the coatings evidence a very high solar absorptivity that jointly with their high electrical conductivity broadens their potential applications, among others, for electromagnetic interference shielding or as photothermal detector and solar absorber for solar steam generation and water desalination.
| Type: | Article |
|---|---|
| Title: | Low percolation threshold in highly conducting graphene nanoplatelets/glass composite coatings |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.carbon.2018.07.030 |
| Publisher version: | https://doi.org/10.1016/j.carbon.2018.07.030 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | graphene; hybrid graphene/glass coatings; electrical conductivity; general effective media (GEM); percolation threshold |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10059402 |
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