Flow-driven voltage generation in carbon nanotubes |
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Authors: | A K Sood S Ghosh Anindya Das |
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Institution: | (1) Department of Physics, Indian Institute of Science, 560 012 Bangalore, India;(2) DST Unit of Nanoscience and Nanotechnology, Indian Institute of Science, 560 012 Bangalore, India;(3) Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., 560 064 Bangalore, India |
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Abstract: | The flow of various liquids and gases over single-walled carbon nanotube bundles induces an electrical signal (voltage/current)
in the sample along the direction of the flow. The electrical response generated by the flow of liquids is found to be logarithmic
in the flow speed over a wide range. In contrast, voltage generated by the flow of gas is quadratically dependent on the gas
flow velocity. It was found that the underlying physics for the generation of electrical signals by liquids and gases are
different. For the liquid, the Coulombic interaction between the ions in the liquid and the charge carriers in the nanotube
plays a key role while electrical signal generation due to gas flow is due to an interplay of Bernoulli’s principle and Seebeck
effect. Unlike the liquid case which is specific to the nanotubes, the gas flow effect can be seen for a variety of solids
ranging from single and multi-walled carbon nanotubes, graphite and doped semiconductors. |
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Keywords: | Nanotubes flow sensors |
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