Nufer, Sebastian, Fantanas, Dimitrios, Ogilvie, Sean P, Large, Matthew J, Winterauer, Dominik J, Salvage, Jonathan P, Meloni, Manuela, King, Alice A K, Schellenberger, Pascale, Shmeliov, Aleksey, Victor-Roman, Sandra, Pelaez-Fernandez, Mario, Benito, Ana, Nicolosi, Valeria, Arenal, Raul, Maser, Wolfgang, Brunton, Adam and Dalton, Alan B (2018) Percolating metallic structures templated on laser-deposited carbon nanofoams derived from graphene oxide: applications in humidity sensing. ACS Applied Nano Materials, 1 (4). pp. 1828-1835. ISSN 2574-0970

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Abstract

Carbon nanofoam (CNF) is a low-density, high-surface-area material formed by aggregation of amorphous carbon nanoparticles into porous nanostructures. We report the use of a pulsed infrared laser to prepare CNF from a graphene oxide (GO) target material. Electron microscopy shows that the films consist of dendritic strings that form web-like three-dimensional structures. The conductivity of these structures can be modified by using the CNF as a nanostructured scaffold for gold nanoparticles deposited by sputter coating, controllably increasing the conductivity by up to 4 orders of magnitude. The ability to measure the conductivity of the porous structures allows electrochemical measurements in the environment. Upon decreasing humidity, the pristine CNF exhibits an increase in resistance with a quick response and recovery time. By contrast, the gold-sputtered CNF showed a decrease in resistance, indicating modification of the doping mechanism due to water adsorption. The sensitivity to humidity is eliminated at the percolation threshold of the metal on the CNF.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups:	Materials Physics Group
Subjects:	Q Science
Depositing User:	Sean Paul Ogilvie
Date Deposited:	10 Apr 2018 15:57
Last Modified:	01 Jul 2019 18:16
URI:	http://sro.sussex.ac.uk/id/eprint/74975

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