Browsing by Author "Maaroof, Abbas"

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Browsing by Author "Maaroof, Abbas"

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  • Cortie, Michael; Maaroof, Abbas; Smith, Geoff (Australian Institute of Physics, 2005)
    Very thin spongy nanoporous gold films have a unique nanostructure and hence unusual properties. Our interest in these materials is also due to their wide range of potential application (1,2). An optical study for such ...
  • Cortie, Michael; Maaroof, Abbas; Mortari, Alessia; Wuhrer, Ric (IEEE, 2006)
    A nano- or- mesoporous sponge of Au is formed when the intermetallic compound AuAl2 is de-alloyed with NaOH. The large specific surface area of the sponge, and the unique surface chemical properties of Au indicate that ...
  • Maaroof, Abbas; Gentle, Angus; Cortie, Michael; Smith, Geoff (IOP PUBLISHING, 2007)
    The far field plasmonic behaviour of nanoporous gold films with void densities ranging from 60% to 90% has been investigated and modelled. These layers have good dc conductivity and quite different nanostructure to traditional ...
  • Maaroof, Abbas; Smith, Geoff (Elsevier Science Sa, 2005)
    Two distinct electrically percolated types of nanostructured silver (n-Ag) films on glass substrates have been optically and structurally studied and effective refractive indices determined. The first though well above the ...
  • Cortie, Michael; Maaroof, Abbas; Smith, Geoff (World Gold Council, 2005)
    The surfaces of nanoscale gold particles and components are oxide-free under normal ambient conditions. This unusual attribute permits the exploration of microstructures and functionalities that would not be feasible for ...
  • Liu, Jian; Maaroof, Abbas; Wieczorek, Lech; Cortie, Michael (Wiley-V C H Verlag Gmbh, 2005)
    Cap-shaped metal nanoparticles (see Figure) have optical spectra with significant absorption in the infrared. Such shapes, produced by physical vapor deposition onto a polymer-particle template, can be readily separated ...
  • Gentle, Angus; Maaroof, Abbas; Smith, Geoff (Spie-Soc Photoptical Instrumentation Engineers, 2009)
    The response to applied electric fields of vanadium dioxide thin films above and below the phase transition depends on the size of grains if below ~200nm across, and on aluminum doping above a critical concentration. Tc ...
  • Maaroof, Abbas; Gentle, Angus; Smith, Geoff (Elsevier Science Bv, 2007)
    Nanoporousgold films produced by de-alloying AuAl2 with void densities between 45% and 65% retain high infra-red reflectance and good conductivity. They act optically like a homogenous Lorentz-Drude metal with a unique wp ...
  • Bosman, Michel; Keast, Vicki; Watanabe, Masashi; Maaroof, Abbas; Cortie, Michael (Institute of Physics (UK), 2007)
    The optical response from metal nanoparticles and nanostructures is dominated by surface plasmon generation and is critically dependent on the local structure and geometry. Electron energy-loss spectroscopy (EELS0, combined ...
  • Yuan, L; Liu, Hua-Kun; Maaroof, Abbas; Konstantinov, Konstantin; Liu, Jian; Cortie, Michael (Ecole Polytechnique Montreal, 2007)
    Mesoporous goldsponges were prepared by chemical removal of Al from thin films of an AuAl2 precursor that had been deposited on Cu sheet. The morphology of the An was characterised by interconnected pores and channel,v of ...
  • Mortari, Alessia; Maaroof, Abbas; Martin, Donald; Cortie, Michael (Elsevier, 2007)
    he use of mesoporous gold as electrode material for measurement of electrochemical capacitance is investigated. The electrodes possess a pore size in the range of 10-30nm and are prepared by de-alloying films of AuAl"x, ...
  • Cortie, Michael; Maaroof, Abbas; Stokes, Nicholas; Mortari, Alessia (CSIRO, 2007)
    Mesoporous gold sponge may be prepared by the removal of aluminium from AuAl2 by an alkaline leach. The resulting material has nanosclae pores and channels, with a high specific surface area that can be exploited in ...
  • Maaroof, Abbas; Cortie, Michael; Gentle, Angus; Smith, Geoff (Elsevier, 2007)
    Mesoporous gold sponge has optical properties that can be intermediate between those of metals and insulators with a flat spectral response that is unlike that of bulk gold. Films of different thicknesses were produced and ...
  • Gentle, Angus; Maaroof, Abbas; Smith, Geoff (SPIE - International Society for Optical Engineering, 2007)
    Conductor-insulator nanocomposites in which the conductor percolates can have optical responses at longer wavelengths like dense conductors with an effective plasma frequency wp*. This applies at wavelengths where the ...
  • Maaroof, Abbas; Cortie, Michael; Harris, Nadine; Wieczorek, Lech (Wiley, 2009)
  • Zareie, Hadi; Morgan, Scott; Moghaddam, Matthew; Maaroof, Abbas; Cortie, Michael; Phillips, Matt (Amer Chemical Soc, 2008)
    Natural lithography was used to prepare arrays of nanoscale capacitors on silicon. The capacitance was verified by a novel technique based on the interaction of a charged substrate with the electron beam of a scanning ...
  • Gentle, Angus; Maaroof, Abbas; Smith, Geoff (Institute of Physics (UK), 2007)
    Thin films of vanadium dioxide with grain size smaller than 60nm have a metallic phase with excellent plasmonic response,but their dc resistivity falls as temperature rises to values above the metal-insulator transition. ...
  • Maaroof, Abbas; Gentle, Angus; Cortie, Michael; Smith, Geoff (The International Society for Optical Engineering, 2007)
    The electrical and optical properties of mesoporous gold are compared to those of thin porous gold films and a simulated thin film made by randomly distributing voids in gold, until the voids fill 76% of film volume. All ...
  • Cortie, Michael; Maaroof, Abbas; Ngoepe, P; Smith, Geoff (Elsevier Science Bv, 2006)
    A method to produce nanoscale films of AuAlx and PtAlx, and their mesoporous elemental derivatives is described, and the morphology and optical properties of these coatings explored. The color of the AuAlx film is bright ...
  • Gentle, Angus; Maaroof, Abbas; Cortie, Michael; Smith, Geoff (SPIE, 2007)
    Vanadium dioxide udergoes a reversible metal-insulator phase transition at about 68 degrees C. Cooatings iof this compound are reflective in the infrared above this temperature, and transmissive or absorptive below it, ...