P1NM.14 - Percolating metallic structures templated on laser - deposited carbon nanofoams derived from graphene oxide: Applications in humidity sensing
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-1 - Nanomaterials
- Author(s)
- S. Nufer, A. Dalton - University of Sussex, Brighton (United Kingdom), J. Salvage - University of Brighton, Brighton (United Kingdom), A. Shmeliov - School of Physics, Trinity College Dublin, Dublin (Ireland), A. Brunton - M-Solv Ltd, Oxonian Park, Langford Locks, Kidlington, Oxford (United Kingdom)
- Pages
- 605 - 606
- DOI
- 10.5162/IMCS2018/P1NM.14
- ISBN
- 978-3-9816876-9-9
- Price
- free
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 which 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 four orders of magnitude. 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.