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Open Access Nano Express

Flow-induced voltage generation over monolayer graphene in the presence of herringbone grooves

Seung Ho Lee1, Young Bok (Abraham) Kang3, Wonsuk Jung1, Yousung Jung2, Soohyun Kim1* and Hongseok (Moses) Noh3*

Author Affiliations

1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea

2 Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea

3 Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA

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Nanoscale Research Letters 2013, 8:487  doi:10.1186/1556-276X-8-487

Published: 20 November 2013

Abstract

While flow-induced voltage over a graphene layer has been reported, its origin remains unclear. In our previous study, we suggested different mechanisms for different experimental configurations: phonon dragging effect for the parallel alignment and an enhanced out-of-plane phonon mode for the perpendicular alignment (Appl. Phys. Lett. 102:063116, 2011). In order to further examine the origin of flow-induced voltage, we introduced a transverse flow component by integrating staggered herringbone grooves in the microchannel. We found that the flow-induced voltage decreased significantly in the presence of herringbone grooves in both parallel and perpendicular alignments. These results support our previous interpretation.

Keywords:
Graphene; Voltage generation; Herringbone grooves; Transverse flow; Microchannel