J L Plaza

Publications (3)4.07 Total impact

• Article: Charge transport in nanocrystal wires created by direct electron beam writing

  S. Jacke, J.L. Plaza, J.P. Wilcoxon, R.E. Palmer, P. Beecher, G. De Marzi, G. Redmond, A.J. Quinn, Y. Chen
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  ABSTRACT: The authors report the fabrication and electrical characterisation of nanowires created via direct electron beam writing in films of passivated gold nanocrystals. Charge transport measurements yield room temperature resistances in the range 10⁵-10⁸ . Variable temperature measurements yield two distinct sets of characteristics: activated conduction (high resistance) consistent with weakly coupled metal nanocrystals separated by alkyl thiol tunnel barriers and quasi-localised behaviour (low resistance) consistent with stronger coupling between granular metallic islands in a carbonaceous matrix. The data indicate that electron beam writing is a promising method for local manipulation of inter-nanocrystal coupling in nanocrystal arrays.
  Micro & Nano Letters 11/2010; · 0.94 Impact Factor
• Article: Electrostatically stabilised nanoparticles: self-organization and electron-beam patterning.

  J L Plaza, P M Mendes, S Diegoli, Y Chen, J A Preece, R E Palmer
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  ABSTRACT: The self-organisation of citrate- and magnesium oleate-stabilised gold nanoparticles on SiO2/Si substrates was investigated. In drop deposition, nucleation of citrate-stabilised gold nanoparticles was observed at the rim of the droplet, symmetric or multibranched dendroid gold structures were found in the area between the rim and the central part of the droplet, depending on the drying temperature. Homogeneous submonolayer nanoparticle coverage was obtained by immersion of amineterminated SiO2/Si surfaces into a citrate-stabilised colloidal gold acidic solution. Drop deposition of magnesium oleate-stabilised gold nanoparticles onto the SiO2/Si surfaces resulted in the formation of uniformly close-packed nanoparticle arrays. Under electron beam irradiation, no apparent changes were found for monolayer films of citrate-stabilized particles, but sintering of the nanoparticles was observed in multilayer films. In contrast, coalescence of magnesium oleate-stabilised gold nanoparticle occurred in monolayer films after electron irradiation.
  Journal of Nanoscience and Nanotechnology 12/2005; 5(11):1826-31. · 1.56 Impact Factor
• Article: Electrostatically Stabilised Nanoparticles: Self-Organization and Electron-Beam Patterning

  J.L. Plaza, P.M. Mendes, S. Diegoli, Y. Chen, J.A. Preece, R.E. Palmer
  [show abstract] [hide abstract]
  ABSTRACT: The self-organisation of citrate- and magnesium oleate-stabilised gold nanoparticles on SiO2/Si substrates was investigated. In drop deposition, nucleation of citrate-stabilised gold nanoparticles was observed at the rim of the droplet, symmetric or multibranched dendroid gold structures were found in the area between the rim and the central part of the droplet, depending on the drying temperature. Homogeneous submonolayer nanoparticle coverage was obtained by immersion of amineterminated SiO2/Si surfaces into a citrate-stabilised colloidal gold acidic solution. Drop deposition of magnesium oleate-stabilised gold nanoparticles onto the SiO2/Si surfaces resulted in the formation of uniformly close-packed nanoparticle arrays. Under electron beam irradiation, no apparent changes were found for monolayer films of citrate-stabilized particles, but sintering of the nanoparticles was observed in multilayer films. In contrast, coalescence of magnesium oleate-stabilised gold nanoparticle occurred in monolayer films after electron irradiation.
  Journal of Nanoscience and Nanotechnology 10/2005; 5(11):1826-1831. · 1.56 Impact Factor