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

Markovich, Gil and Collier, Charles P. and Heath, James R. (1998) Reversible Metal-Insulator Transition in Ordered Metal Nanocrystal Monolayers Observed by Impedance Spectroscopy. Physical Review Letters, 80 (17). pp. 3807-3810. ISSN 0031-9007. doi:10.1103/PhysRevLett.80.3807.

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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.

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Heath, James R.0000-0001-5356-4385
Additional Information:© 1998 The American Physical Society. Received 3 November 1997. We thank R.S. Williams and Hewlett Packard Corporation for loan of the LCR meter used in these experiments. We acknowledge helpful discussions with Steve Kivelson, Rich Saykally, and Alex Bratkovski. J.R.H. and G.M. acknowledge support from an NSF-NYI grant. C.P.C. acknowledges support from NSF Grant No. CHE-9424482.
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Issue or Number:17
Record Number:CaltechAUTHORS:MARprl98b
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ID Code:5362
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Deposited On:13 Oct 2006
Last Modified:08 Nov 2021 20:24

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