Volume 97, Number 3, February 2012
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||03 February 2012|
Improved electronic and magnetic properties of reduced graphene oxide films
Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand - Private Bag 3, WITS 2050, Johannesburg, South Africa
2 DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand - Private Bag 3, WITS 2050, Johannesburg, South Africa
3 Microsystems Center, Tyndall National Institute - Lee Maltings, Dyke Parade, Cork, Ireland
Accepted: 19 December 2011
We demonstrate semi-metallic transport in graphene oxide layers treated with an organic acid through a nearly linear current-vs.-voltage relationship and the weak temperature dependence of resistance from high temperatures down to 20 K. Additionally an energy gap was observed below 17 K due to the formation of local barriers by residual oxygen groups and disorder in reduced graphene oxide (RGO) sheets. At higher temperatures resistance shows a negative T2 temperature dependence. Temperature dependent magnetization measurements showed a phase transition from diamagnetic to ferromagnetic at around 10 K, in agreement with the electronic transport properties of the RGO films.
PACS: 81.05.U- – Carbon/carbon-based materials / 68.65.Pq – Graphene films / 72.80.Vp – Electronic transport in graphene
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.