P10.1 - Sensitivity of graphene humidity sensors
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- P10 - Applications
- H. Zakaryan, V. Aroutionian - Yerevan State University Yerevan, Yerevan (Armenia)
- 868 - 872
Results of investigations of sensitivity of graphene to the humidity are reported. Comparison of properties of graphene and polymer humidity sensors are carried out. Graphene sensors has remarkable response at much lower water concentrations (started 0.01 kg water vapor in 1kg air) compare to ~40% of relative humidity for nanoporous polymer membranes. This resistivity is more than 150 GOhm at 40% of the humidity and drops 7,5 times at 60% of the humidity. In our case the resistivity ~100KOhm drops several times in the same range of the humidity. We think that it is connected with the graphene band opening phenomenon. During the adsorption water cause defects and open the band gap. The adsorbate also can transfer charge which depends on relative position of HOMO/LUMO of water and Dirac point of graphene.