Reversible metal-insulator transition in ordered metal nanocrystal monolayers observed by impedance spectroscopy

Gil Markovich, Charles P. Collier, James R. Heath

Research output: Contribution to journalArticlepeer-review

138 Scopus citations

Abstract

Low frequency impedance spectroscopy was applied on a Langmuir monolayer of alkylthiol passivated 35Å diameter silver quantum dots, as a function of interparticle separation distance. As interparticle spacing decreases below 30% of particle diameter, a reduction in interparticle charge tunneling time is observed. On further compression, the complex impedance of the films undergoes a transition from a parallel RC equivalent circuit to an inductive circuit. Optical reflectance changes in the films are consistent with the deduced metal-insulator transition.

Original languageEnglish
Pages (from-to)3807-3810
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number17
DOIs
StatePublished - 1998
Externally publishedYes

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