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Competitive transport and percolation in disordered arrays of molecularly-linked Au nanoparticles

J. Chem. Phys. 117, 3978 (2002); doi:10.1063/1.1495838

Issue Date: 22 August 2002

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P.-E. Trudeau, A. Orozco, E. Kwan, and A.-A. Dhirani
Department of Chemistry, University of Toronto, Toronto, Ontario, Canada, M5S 3H6
We explore the electrical characteristics of disordered films of strongly coupled, molecularly-linked gold nanoparticles (NPs). dc conductivity vs temperature (g vs T) measurements exhibit features that can track a number of competing transport mechanisms. Films with fewer than 6 layers show clear signatures of both activated tunneling and thermionic emission. Our linked NPs admit locally metallic transport, likely through strong quantum interactions, and at room temperature, films with 6 or more layers exhibit a transition to metallic dominated behavior. Observed g vs T dependencies have been modeled treating arrays as disordered resistor networks and using an effective medium approximation (EMA). Our results show that percolation phenomena can play critical roles in transport through NP films, particularly near metal–insulator transitions. ©2002 American Institute of Physics.
History: Received 15 March 2002; accepted 30 May 2002
Permalink: http://link.aip.org/link/?JCPSA6/117/3978/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.46.+w
    Structure of solids and liquids; crystallography Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • 72.10.-d
    Electronic transport in condensed matter Theory of electronic transport; scattering mechanisms
  • 63.22.+m
    Lattice dynamics Phonons or vibrational states in low-dimensional structures and nanoscale materials
  • 64.60.Ak
    Equations of state, phase equilibria, and phase transitions General studies of phase transitions Renormalization-group, fractal, and percolation studies of phase transitions
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (26)
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