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Tuning Surface Charge Property by Floating Gate Field Effect Transistor

Song Xue1, Ning Hu2, Shizhi Qian1+
1Institute of Micro/Nanotechnology, Old Dominion University, Norfolk, VA 23529, USA
2 Bioengineering College, Chongqing University, Chongqing 400030, P.R. China
Abstract
Interfacial electrokinetic phenomena, which highly depend on the surface charge property of an object in contact with an aqueous electrolyte solution, have been widely used to manipulate and transport ions, fluids and particles in micro/nanofluidic devices. Field effect transistor (FET) offers flexible and rapid control of the surface charge property, which in turn provides a more sophisticated control of the electrokinetics-based micro/nanofluidics. Tuning the surface charge property by a floating gate field effect transistor (FGFET) rather than the conventional FET is proposed and analyzed for the first time. In contrast to the conventional FET having a control gate fabricated on the outer surface of the dielectric channel wall, the FGFET has an additional floating gate electrode embedded inside the dielectric channel wall. A mathematical model has been developed to analyze the zeta potential of a planar dielectric surface regulated by the conventional FET and the FGFET techniques. Results show that the FGFET is superior to the conventional FET to tune the surface charge property of a dielectric material in contact with an aqueous solution. The FGFET has great potential to control ions, fluids, and particle electrokinetic transport in electrokinetics-based micro/nanofluidic devices.
Keywords: Microfluidics; Nanofluidics; Electrokinetics; Field Effect Control; Field Effect Transistor (FET); Floating Gate Field Effect Transistor (FGFET)
_______________________________________
+ Corresponding author. E-mail: sqian@odu.edu
1. Introduction Micro/nanofluidic devices have the

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