• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/065/04/0571-0579

    • Keywords

       

      Nanotubes; flow sensors

    • 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.

    • Author Affiliations

       

      A K Sood1 2 3 S Ghosh1 Anindya Das1

      1. Department of Physics, Indian Institute of Science, Bangalore - 560 012, India
      2. DST Unit of Nanoscience and Nanotechnology, Indian Institute of Science, Bangalore - 560 012, India
      3. Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore - 560 064, India
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.