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APS » Journals » Phys. Rev. Lett. » Volume 80 » Issue 17
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Phys. Rev. Lett. 80, 3807–3810 (1998)

Reversible Metal-Insulator Transition in Ordered Metal Nanocrystal Monolayers Observed by Impedance Spectroscopy

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Gil Markovich1, Charles P. Collier2, and James R. Heath1,*
1Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095-1569
2Department of Chemistry, University of California, Berkeley, California 94720-1460

Received 3 November 1997; published in the issue dated 27 April 1998

Low frequency impedance spectroscopy was applied on a Langmuir monolayer of alkylthiol passivated 35 Å 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.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.3807
DOI:
10.1103/PhysRevLett.80.3807
PACS:
71.30.+h, 73.20.Jc, 73.61.Tm

*Author to whom all correspondence should be addressed.

 
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