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Nanoscale static voltage generation and its surface potential decay using scanning probe microscopy

Publication Type : Journal Article

Publisher : Micro Nano Letters

Source : Micro Nano Letters, Volume 12, Number 12, p.928-933 (2017)

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Keywords : charge decay, charge retention, contact electrification, dynamic contact mode electrostatic force microscopy, electron negativity, electrostatic potential, metal electrode, metal-insulator boundaries, metal-insulator configuration, modulated tip, nanoscale static voltage generation, nanoscopic domains, nanoscopic voltage, neat unpolarised polymer polyvinylidene fluoride, nonuniform rubbing, Polymer films, polymeric material, rubbed polymer films, rubbed surface, Scanning probe microscopy, scanning tunnelling microscopy, surface charging, surface potential, surface potential decay, triboelectric series, tribolayers, uniform rubbing, unrubbed polymer film, unrubbed surface, work function

Campus : Amritapuri

School : School of Engineering

Center : Electronics Communication and Instrumentation Forum (ECIF)

Department : Electronics and Communication

Year : 2017

Abstract : This work aims at the manipulation of nanoscopic voltage produced through uniform and non-uniform rubbing in neat unpolarised polymer polyvinylidene fluoride. A metal-insulator configuration is considered for the analysis. The decay of surface potential in such a configuration is also addressed in this work. The polarity of the voltage observed on the film depends on the work function of the metal electrode in contact as well as the electronegativity of polymeric material under study. Scanning probe microscopic techniques such as dynamic contact mode electrostatic force microscopy, scanning tunnelling microscopy are used for the investigation of specific electrostatic potential variation on polymer films. Effect of contact electrification leads to nanoscopic domains of voltage generation on the surface of the tribolayers. Electrostatic potential developed on the surface of unrubbed polymer film using modulated tip is in the range of 20-40 mV. The range of voltage generated increased from 20 to 125 mV in the case of rubbed polymer films. Charge retention is discussed through obtaining surface potential decay trend at various intervals. This also plays an important role in the generation of the voltage as well as the current. The above scenario has been demonstrated in both rubbed and unrubbed scenarios. Charge decay is observed to be gradually decreasing from 40 to 29.5 mV in unrubbed surface and 125 to 14 mV in rubbed surface for various time intervals. The obtained results suggest insignificance of triboelectric series on contact electrification between similar tribolayers.

Cite this Research Publication : Sreenidhi P. R., S. Karumuthil, C., Valiyaneerilakkal, U., and Varghese, S., “Nanoscale static voltage generation and its surface potential decay using scanning probe microscopy”, Micro Nano Letters, vol. 12, pp. 928-933, 2017.

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