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Variable single electron charging energies and percolation effects in molecularly linked nanoparticle films

J. Chem. Phys. 119, 5267 (2003); doi:10.1063/1.1597871

Issue Date: 8 September 2003

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P.-E. Trudeau, A. Escorcia, and A.-A. Dhirani
Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6
We study electrical transport in strongly coupled, molecularly linked, gold nanoparticle (NP) films whose bulk dc conductances are governed by percolation phenomena. Films with fewer NPs exhibit current suppression below a threshold voltage, likely due to single-electron charging of NP clusters. In some cases, the thresholds are very large (~1 V) and suppression persists to room temperature. The thresholds tend to decrease with increasing amounts of NPs in the film, and eventually, metal-like conductance is observed down to at least 10 K. The observed trend toward metal-like conductance, despite the presence of film disorder, is enabled by strong inter-NP coupling and increasing film connectivity. The latter is an inherent property of molecularly linked NP films due to both robust chemical inter-NP linkages provided by alkane dithiol linker molecules, coupled with the ability to grow chains of connected NPs to arbitrary lengths through cyclical Au/dithol treatments. In the case of small thresholds, our data is well described by a high-temperature approximation of "orthodox" theory for a linear array of tunnel junctions. ©2003 American Institute of Physics.
History: Received 8 April 2003; accepted 12 June 2003
Permalink: http://link.aip.org/link/?JCPSA6/119/5267/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.46.+w
    Structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • 73.22.-f
    Electronic structure of nanoscale materials including clusters, nanoparticles, nanotubes, and nanocrystals
  • 73.63.Bd
    Nanocrystalline materials (electronic transport)
  • 68.55.Jk
    Thin film structure and morphology; thickness; crystalline orientation and texture
  • YEAR: 2003

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