Bridge-enhanced nanoscale impedance microscopy

L. S.C. Pingree, M. C. Hersam

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Abstract

A conductive atomic force microscopy (cAFM) technique has been developed that is capable of quantitatively measuring the magnitude and phase of alternating current flow through the tip/sample junction with a five order of magnitude improvement in sensitivity. Bridge-enhanced nanoscale impedance microscopy (BE-NIM) uses a tunable resistor/capacitor bridge circuit to null the spurious contribution to the tip/sample current caused by fringe capacitance between the cAFM cantilever and the sample. As a proof of principle, BE-NIM is used to characterize an array of electron-beam lithographically patterned metal-oxide-semiconductor capacitors and compared directly to conventional nanoscale impedance microscopy. In addition, BE-NIM is applied to a multiwalled carbon nanotube/poly (m -phenylenevinylene-co-2,5-dioctyloxy-p- phenylenevinylene) nanocomposite material, on which the alternating current behavior of individual nanoscale conductive pathways is quantitatively probed.

Original languageEnglish
Article number233117
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number23
DOIs
Publication statusPublished - Dec 12 2005

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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