Self-gating effects in carbon nanotube network based liquid gate field effect transistors

We developed a field effect transistor which has two concentric electrodes as the source and drain with the carbon nanotube network as a semiconductor channel layer. When this device is placed in an aqueous solution for sensor applications, the electric potential of the liquid is stabilized to the e...

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Bibliographic Details
Published in:Applied physics letters 2008-12, Vol.93 (24), p.243115-243115-3
Main Authors: Kim, Dong Wan, Choe, Gyu Sik, Seo, Sung Min, Cheon, Jun Ho, Kim, Hansuk, Ko, Jung Woo, Chung, In Young, Park, Young June
Format: Article
Language:English
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Summary:We developed a field effect transistor which has two concentric electrodes as the source and drain with the carbon nanotube network as a semiconductor channel layer. When this device is placed in an aqueous solution for sensor applications, the electric potential of the liquid is stabilized to the electric potential of the enclosing electrode due to the larger electrical double layer capacitance between the liquid and the enclosing electrode, performing a gate reaction to the carbon nanotube network channel. This new phenomenon, hereafter called the self-gating effect, brings benefits to reliable operation of devices removing the need of an additional external reference electrode.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2978095