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Phys. Rev. Lett. 96, 156403 (2006) [4 pages]Metal to Insulator Transition in Films of Molecularly Linked Gold Nanoparticles
Received 30 August 2004; revised 17 February 2006; published 21 April 2006
We report a metal to insulator transition (MIT) in disordered films of molecularly linked gold nanoparticles (NPs). As the number of carbons (n) of alkanedithiol linker molecules (CnS2) is varied, resistance (R) at low temperature (T=2 K) and at 200 K, as well as trends in R vs T data at intermediate temperatures, all point to an MIT occurring at n=5. We describe these results in a context of a Mott-Hubbard MIT. We find that all insulating samples (n ©2006 The American Physical Society
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5) exhibit a universal scaling behavior R~exp[(T0/T)
] with 
=0.65, and all metallic samples (n
5) exhibit weaker R-T dependencies than bulk gold. We discuss these observations in terms of competitive thermally activated processes and strong, T-independent elastic scattering, respectively.
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