Determination of work function in the individual carbon nanotubes using electrostatic force microscopy

In this letter we report the determination of electron work function (WF) in the individual undoped, as-grown and thermally treated nitrogen-doped carbon nanotubes (CNTs) with the use of the electrostatic force microscopy (EFM). The determination of WF is based on the measurement of the contact pote...

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Veröffentlicht in:Materials letters 2015-12, Vol.161, p.534-537
Hauptverfasser: Davletkildeev, Nadim A., Stetsko, Denis V., Bolotov, Valery V., Stenkin, Yury A., Korusenko, Petr M., Nesov, Sergey N.
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Sprache:eng
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Zusammenfassung:In this letter we report the determination of electron work function (WF) in the individual undoped, as-grown and thermally treated nitrogen-doped carbon nanotubes (CNTs) with the use of the electrostatic force microscopy (EFM). The determination of WF is based on the measurement of the contact potential difference between CNTs and the probe tip. Obtained mean values of WF for a large number of individual CNTs are in quantitative agreement with the value of WF obtained by X-ray photoelectron spectroscopy at the CNTs layers. The ability to determine WF in individual CNTs is due to the sensitivity of the EFM signal to the interaction of CNTs with the tip apex. •Work function for individual CNTs is determined by electrostatic force microscopy.•Contact potential difference CNT-tip is determined and work function is calculated.•Mean work function for many CNTs is in agreement with the one obtained by XPS.•Ability to determine work function is related to interaction of CNT with tip apex.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2015.09.045