University of Twente Student Theses


Electrowetting-controlled diode-like behavior of suspended graphene membranes

Bruijn, D.S. de (2018) Electrowetting-controlled diode-like behavior of suspended graphene membranes.

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Abstract:In this research the electrowetting of suspended graphene membranes on a silicon nitride substrate has been studied and observed. In addition, a resistor based model is supported by measurements of the voltage dependent conductance of the system. The suspended graphene is nanoporous and allows for charge transport when a potential over the membrane is applied. At a certain threshold voltage the graphene starts to detach from the SiN substrate and an increase in conductance is observed. The results help understanding systems, which are typically used in fields like DNA sequencing and desalination. So far, in literature voltages above 0.2 V are normally avoided, because the increased conductivity at higher voltage is not well understood in the existing literature that we found. Electrochemical, optical and AFM measurements have been performed to get deeper insight in the system and confirm that electrowetting results in an increased conductivity.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:33 physics, 51 materials science, 53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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