Piezoresistivity in single DNA molecules

Christopher Bruot, Julio L. Palma, Limin Xiang, Vladimiro Mujica, Mark A. Ratner and Nongjian Tao ()
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Christopher Bruot: Center for Bioelectronics and Biosensors, Biodesign Institute, School of Electrical, Computer, and Energy Engineering, Arizona State University
Julio L. Palma: Center for Bioelectronics and Biosensors, Biodesign Institute, School of Electrical, Computer, and Energy Engineering, Arizona State University
Limin Xiang: Center for Bioelectronics and Biosensors, Biodesign Institute, School of Electrical, Computer, and Energy Engineering, Arizona State University
Vladimiro Mujica: Arizona State University
Mark A. Ratner: Northwestern University
Nongjian Tao: Center for Bioelectronics and Biosensors, Biodesign Institute, School of Electrical, Computer, and Energy Engineering, Arizona State University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Piezoresistivity is a fundamental property of materials that has found many device applications. Here we report piezoresistivity in double helical DNA molecules. By studying the dependence of molecular conductance and piezoresistivity of single DNA molecules with different sequences and lengths, and performing molecular orbital calculations, we show that the piezoresistivity of DNA is caused by force-induced changes in the π–π electronic coupling between neighbouring bases, and in the activation energy of hole hopping. We describe the results in terms of thermal activated hopping model together with the ladder-based mechanical model for DNA proposed by de Gennes.

Date: 2015
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DOI: 10.1038/ncomms9032

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