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  • 1
    Electronic Resource
    Electronic Resource
    Photoemission from metals covered with a nanostructured carbon film (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4005-4009 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Though present photoemitting cathodes have attained quantum yields, lifetimes, dark currents, and response times as required by high-luminosity accelerators, their use is hampered by their high reactivity to residual gases even in ultra-high-vacuum conditions. Ultrathin (20–200 nm) films of nanostructured sp2 carbon, directly grown on photocathodes by supersonic cluster-beam deposition, besides providing a strongly bound, inert protective coating, are shown to maintain the photoemission efficiency of clean metallic substrate cathodes. Moreover, nanostructured carbon coating is shown to induce strong nonlinearities in photoemission at high intensities, which can be explained as due to the Auger effect. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372446
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  • 2
    Electronic Resource
    Electronic Resource
    Raman scattering characterization of amorphous carbon from photothermal oxidation of fullerite (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5945-5952 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous carbon has been produced by laser irradiation of single-crystal and polycrystalline fullerite, via cage opening reactions and coalescence of C60 units. A photothermal oxidation reaction is responsible for fullerene cage opening, and oxygen is also bounded to the final products of the coalescence process. Under inert atmosphere C60 clusters retain their structure even under very high laser fluence. The structure of the new carbon phase has been characterized by Raman scattering and energy-dispersive x-ray spectroscopy. A disordered amorphous carbon phase is observed. The evolution of Raman spectra gives information on the kinetics of coalescence and rearrangement of fullerene fragments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360597
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  • 3
    Electronic Resource
    Electronic Resource
    Surface periodic structures induced by pulsed laser irradiation of fullerite (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1769-1771 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fullerite surface modifications induced by 1064 and 266 nm pulsed laser irradiation have been studied by scanning electron microscopy. The formation of micropatterns with a well-defined periodicity is reported. The morphology of the periodic nanostructures can be controlled by varying the laser fluence, the angle of incidence, and the wavelength. The different patterns observed for infrared and ultraviolet irradiation suggest that electronic and thermal effects are responsible of the formation of the periodic structures. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116661
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of cluster-assembled carbon thin films (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5793-5798 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanostructured carbon thin films have been produced by deposition of supersonic cluster beams. The clusters are generated by a pulsed arc cluster ion source modified in order to achieve high fluxes and stability. Scanning electron microscopy, Raman, and optical spectroscopy show that the films are a low density network of nanometer-size particles. The nature of the films is essentially graphite-like with a large number of distorted bonds. The formation of structures based on sp3 bondings is not observed. The use of cluster beam deposition for the synthesis of nanocrystalline thin films is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366446
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  • 5
    Electronic Resource
    Electronic Resource
    Photothermal etching of C60 single crystal induced by laser irradiation (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 153-155 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Modifications induced by laser heating of C60 single-crystal surface under different conditions are examined by scanning electron microscopy. The fullerite surface is etched in the presence of oxygen, whereas no substantial change is seen under inert atmosphere. The fragments, obtained after the oxygen-induced disintegration of fullerene, form a material with a nanostructure similar to amorphous carbon. Three-dimensional microstructures are produced depending on laser annealing conditions. Oxygen in the irradiated region substantially increases, according to energy dispersive x-ray spectroscopy of the surface. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113547
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemical and thermal effects in laser irradiated fullerite: From periodic exfoliation to cone formation (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 293-295 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a characterization of fullerite surface modification by cumulative laser irradiation. We show that the nano- and mesostructure of the transformed material are related and that they depend on the laser wavelength and fluence. Irradiating the sample at 1064 nm we observe periodic exfoliation of the transformed surface which is composed, on a nanometer scale, of a network of graphitic elongated nanoparticles. Under UV irradiation, the nanostructure is characterized by tangled graphene layers and cone formation is observed on a mesoscopic scale. Our observations show that different destabilization mechanisms of C60 produce coalescence pathways towards different nanostructures and mesoscopic morphologies. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120716
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  • 7
    Electronic Resource
    Electronic Resource
    Supercapacitors based on nanostructured carbon electrodes grown by cluster-beam deposition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2662-2664 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanostructured carbon films have been grown at room temperature by supersonic cluster beam deposition. Due to a structure based on nanotube embryos and a porosity with grain sizes of a few tens of nanometers, these films have a highly accessible surface area needed for electrochemical applications such as supercapacitors. Films with a density of 1 g/cm3 show, in the dc regime, a specific capacitance per electrode of 75 F/g on a single-cell device with polycarbonate as the organic electrolyte. The resulting energy and power densities of cluster-assembled carbon electrodes are 76 Wh/kg and 506 kW/kg. The possibility of depositing nanostructured films over a large area on a variety of substrates makes cluster-beam deposition very interesting for the realization of supercapacitors. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125111
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  • 8
    Electronic Resource
    Electronic Resource
    Raman, optical-absorption, and transmission electron microscopy study of size effects in germanium quantum dots (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2409-2411 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quantum confinement effects in Ge nanocrystals in the size range 26–130 A(ring) have been investigated both on the electronic joint density of states and Raman spectra. The high degree of crystallinity of the particles as well as the minimized interaction with the matrix allow detection of shift and broadening of the TO Raman peak, which can be compared with theoretical expectations based on phonon confinement. The evolution of Raman and absorption spectra and their dependence on the nanocrystal dimensions can be related. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117653
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  • 9
    Electronic Resource
    Electronic Resource
    Cluster beam microfabrication of patterns of three-dimensional nanostructured objects (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1059-1061 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter describes the use of supersonic cluster beam deposition (SCBD) through a stencil mask for the fabrication of patterns of cluster-assembled objects. Using carbon cluster beams, micrometer-size pillars and tips have been produced on a variety of substrates. SCBD is characterized by high deposition rates, high lateral resolution, and low temperature processing. Nanostructured objects can be produced with high aspect ratio and controlled shapes. Micropatterning with SCBD can be of interest for applications requiring the integration of cluster-assembled structures with microelectronic or micromechanical devices. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289040
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  • 10
    Electronic Resource
    Electronic Resource
    A portable ultrahigh vacuum apparatus for the production and in situ characterization of clusters and cluster-assembled materials (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 2060-2066 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present and discuss the design and operation of a compact ultrahigh vacuum compatible apparatus for the production and deposition of supersonic cluster beams. The apparatus is equipped with a pulsed microplasma cluster source capable of providing supersonic beams of high stability and intensity. The cluster mass distribution can be analyzed by a two-stage time-of-flight mass spectrometer. The transportability and versatility of the apparatus make the system well suited to perform in situ studies on both gas phase clusters and cluster assembled materials using different characterization facilities. The performances of the system have been tested by scanning tunneling microscopy and photoemission spectroscopy experiments on cluster-assembled carbon films. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1470226
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