Polyelectrolyte junction field effect transistor based on microfluidic chip

Kwang Bok Kim; Ji-Hyung Han; Hee Chan Kim; Taek Dong Chung
April 2010
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p143506
Academic Journal
This study developed the first polyelectrolyte junction field effect transistor capable of operating in an aqueous microfluidic network on a chip. In this system, polydiallyldimethylammonium chloride and poly-2-acrylamido-2-methyl-1-propanesulfonic acid are used for the elaborate control of the ion flow by selective extraction of anions and cations from the microchannel. The rate of ion extraction can be regulated by simply adjusting the gate voltage, and it results in ion depletion in the vicinity of the polyelectrolyte plugs. The extent of ion depletion between the polyelectrolyte plugs is a sensitive function of the ion resistance of the microchannel; therefore, the current between the source and the drain can be controlled by regulating the gate voltage.


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