Abstract
We analyze the noise in liquid-gated, room temperature, graphene quantum dots. These devices display extremely large noise amplitudes. The observed noise is explained in terms of a charge noise model by considering fluctuations in the applied source-drain and gate potentials. We show that the liquid environment and substrate have little effect on the observed noise and as such attribute the noise to charge trapping/detrapping at the disordered graphene edges. The trapping/detrapping of individual charges can be tuned by gating the device, which can result in stable two-level fluctuations in the measured current. These results have important implications for the use of electronic graphene nanodevices in single-molecule biosensing.
Original language | English |
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Pages (from-to) | 871-876 |
Number of pages | 6 |
Journal | Nanoscale |
Volume | 12 |
Issue number | 2 |
DOIs | |
State | Published - Jan 14 2020 |
Funding
Substrate and electrode fabrication was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors thank Bart Limburg and Jakub Sowa for useful discussion and Kevin Lester for preparing the wafers. This work was funded by the UK EPSRC (Grant No. EP/N017188/1). JAM is a RAEng Engineering for Development Research Fellow. JPF thanks the Oxford Australia Scholarship Fund and The University of Western Australia for funding.