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  • 1
    Electronic Resource
    Electronic Resource
    Experimental and simulated analysis of Cu nanoparticles produced by cooled sample irradiation (2000)
    Springer
    Applied physics 71 (2000), S. 219-222 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.46.+w; 61.80.Jh; 61.82.Rx; 31.15.Qg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. In the present work, the production is reported of Cu nanoparticles, with sizes of 2–5 nm, by proton irradiation with a low controlled temperature for the sample. The process yields aggregates over a crystalline matrix of the same element. The structural evolution of the sample is analyzed from macroscopic to nanoscopic scales, using optical and electron microscopy. The grain size and preferential shape-changes of the polycrystalline sheets were obtained by optical chromatic systems. Scanning electron microscopy analysis was used to study the morphology and composition with an Energy Dispersive Spectroscopy (EDS) system, and with the help of transmission electron microscopy the lattice matrix of crystal was solved and the nanoparticles’ shape and size were determined. Molecular simulation tools were used to support the analysis of high-resolution elecron microscopic images and the nanoparticles’ behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050057
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Self-assembling of gold nanoparticles in one, two, and three dimensions (2000)
    Springer
    Applied physics 71 (2000), S. 237-243 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.46.+w; 61.82.Rx; 68.65.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. In the present work, we report the growth of ordered arrays of gold nanoparticles passivated with n-alkylthiol molecules using crystallization in toluene vapor. We kept constant the average particle size and the length of the passivating molecule (1-dodecanethiol). The temperature and time of growth were varied. We show that in the initial stages of the growth, nano-chains of particles are produced. These nano-chains aggregate to form two-dimensional arrays. In the initial stages the nano-chains form a two-dimensional square lattice which then relaxes to a close-packed structure. In latter stages of growth a three-dimensional supercrystal is produced. It is found that the packing of nanoparticles corresponds to an average FCC lattice. However, large variations on the local parameters of the lattice are observed. Near the edges of the supercrystal the anomalous packing reported by Zanchet et al. [20] and Fink et al. [21] was observed. The energy of the observed structures is analyzed using molecular dynamics simulation. It is concluded that using the vapor growth method, it is possible to produce controlled ordered structures from one to three dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000522
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    Paper (German National Licenses)
    Fulltext
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