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Electrostatic Control of Ions and Molecules in Nanofluidic Transistors

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Rohit Karnik,^†^‖ Rong Fan,^‡^‖ Min Yue,^† Deyu Li,^† Peidong Yang,*^‡^§ and Arun Majumdar*^†^§

Department of Mechanical Engineering and Department of Chemistry, University of California, Berkeley, California 94720, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Nano Lett., 2005, 5 (5), pp 943–948

DOI: 10.1021/nl050493b

Publication Date (Web): March 31, 2005

Section:

Electric Phenomena

Abstract

We report a nanofluidic transistor based on a metal-oxide-solution (MOSol) system that is similar to a metal-oxide-semiconductor field-effect transistor (MOSFET). Using a combination of fluorescence and electrical measurements, we demonstrate that gate voltage modulates the concentration of ions and molecules in the channel and controls the ionic conductance. Our results illustrate the efficacy of field-effect control in nanofluidics, which could have broad implications on integrated nanofluidic circuits for manipulation of ions and biomolecules in sub-femtoliter volumes.

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