Observation of current reversal in the scanning tunneling spectra of fullerene-like WS2 nanoparticles

Doron Azulay, Frieda Kopnov, Reshef Tenne, Isaac Balberg, Oded Millo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Current-voltage characteristics measured using STM on fullerene-like WS2 nanoparticles show zero-bias current and contain segments in which the tunneling current flows opposite to the applied bias voltage. In addition, negative differential conductance peaks emerge in these reversed current segments, and the characteristics are hysteretic with respect to the change in the voltage sweep direction. Such unusual features resemble those appearing in cyclic voltammograms, but are uniquely observed here in tunneling spectra measured in vacuum, as well as in ambient and dry atmosphere conditions. This behavior is attributed to tunneling-driven electrochemical processes.

Original languageAmerican English
Pages (from-to)760-764
Number of pages5
JournalNano Letters
Volume6
Issue number4
DOIs
StatePublished - Apr 2006

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