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Title
Japanese: 
English:Four-Terminal Electrical Measurement of a DNA Molecular Bundle Captured by MEMS Tweezers 
Author
Japanese: 宇佐美 雅貴, 石田 忠, 久米村 百子, Laurent Jalabert, Collard Dominique, 藤田 博之.  
English: Masataka Usami, Tadashi Ishida, Momoko Kumemura, Laurent Jalabert, Collard Dominique, Hiroyuki Fujita.  
Language English 
Journal/Book name
Japanese: 
English:IEEJ Transactions on Sensors and Micromachines 
Volume, Number, Page Vol. 133        pp. 98-99
Published date Sept. 24, 2012 
Publisher
Japanese: 
English:IEEJ 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract We measured the electrical characteristics of DNA molecular bundles that were 25-µm long and had a diameter of 100-500 nm. We captured the bundle between the tips of silicon nanotweezers by dielectrophoresis. The two-terminal measurement, which used only the tweezers, failed because of the contact resistance between the bundle and the tips. We adopted a four-terminal measurement that eliminated the effect of the contact resistance. We fabricated potential measurement probes, which consisted of 2-µm-wide line electrodes with a 4-µm separation. The captured DNA bundle was pressed against the probes, and the potential drop associated with the current in the bundle was measured. We successfully determined the conductivity of the bundle.

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