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Percolating metallic structures templated on laser-deposited carbon nanofoams derived from graphene oxide: applications in humidity sensing
journal contribution
posted on 2023-06-09, 12:49 authored by Sebastian Nufer, Dimitrios Fantanas, Sean OgilvieSean Ogilvie, Matthew LargeMatthew Large, Dominik J Winterauer, Jonathan P Salvage, Manuela Meloni, Alice KingAlice King, Pascale Schellenberger, Aleksey Shmeliov, Sandra Victor-Roman, Mario Pelaez-Fernandez, Ana Benito, Valeria Nicolosi, Raul Arenal, Wolfgang Maser, Adam Brunton, Alan DaltonAlan DaltonCarbon 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.
Funding
Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and Communication; G1865; EUROPEAN UNION; 642742
History
Publication status
- Published
File Version
- Accepted version
Journal
ACS Applied Nano MaterialsISSN
2574-0970Publisher
American Chemical SocietyExternal DOI
Issue
4Volume
1Page range
1828-1835Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Materials Physics Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-04-10First Open Access (FOA) Date
2019-03-20First Compliant Deposit (FCD) Date
2018-04-10Usage metrics
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