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  • 1
    Electronic Resource
    Electronic Resource
    Quantum transport in metallic nanowires fabricated by electrochemical deposition/dissolution (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 894-896 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nonmechanical method for fabricating a metallic narrow constriction between two electrodes using electrochemical deposition is described. The width of the constriction can be adjusted by slowly dissolving metal atoms away or redepositing atoms onto the constriction which can be controlled flexibly by the electrodes' potentials. Well-defined plateaus near the integer numbers of the conductance quantum have been observed in these constrictions at room temperature. Since no mechanical movements are involved, this method has the potential of fabricating nanoconstrictions with long term stability. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120928
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular detection based on conductance quantization of nanowires (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1333-1335 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied molecular adsorption onto stable metallic nanowires fabricated with an electrochemical method. Upon the adsorption, the quantized conductance decreases, typically, to a fractional value, which may be attributed to the scattering of the conduction electrons by the adsorbates. The further conductance change occurs when the nanowire is exposed to another molecule that has stronger adsorption strength. Because the quantized conductance is determined by a few atoms at the narrowest portion of each nanowire, adsorption of a molecule onto the portion is enough to change the conductance, which may be used for chemical sensors. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126025
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  • 3
    Electronic Resource
    Electronic Resource
    Quantized tunneling current in the metallic nanogaps formed by electrodeposition and etching (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3995-3997 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied electron tunneling across the gap between two electrodes as the gap is varied by electrodeposition and etching. The tunneling current tends to change in a stepwise fashion, corresponding to a discrete change of the gap width. The stepwise change is due to the discrete nature of atoms and a series of structural relaxations of the atoms at the electrodes between stable configurations upon deposition and etching. By stabilizing the tunneling current on various steps using a feedback loop, we have demonstrated that stable molecular-scale gaps can be fabricated with subangstrom precision. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1332406
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  • 4
    Electronic Resource
    Electronic Resource
    Conductance of polymer nanowires fabricated by a combined electrodeposition and mechanical break junction method (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 811-813 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We electrochemically deposit conducting polymer to bridge two closely placed electrodes, and then form a polymer nanowire by stretching the polymer bridge with the electrodes. During stretching, the conductance increases initially as the polymer chains are aligned in parallel, and then decreases in a stepwise fashion, due to abrupt changes in the nanowire thickness. We study the current–voltage (I–V) characteristics of the nanowire as a function of its electrochemical potential in an analogous fashion to the control of the gate voltage in semiconductor devices. Depending on the potential, the I–V curves vary from ohmic to rectifying characteristics. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1335551
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  • 5
    Electronic Resource
    Electronic Resource
    LaAlO"3 single crystal substrate for epitaxial superconducting thin films
    Amsterdam : Elsevier
    Solid State Communications 75 (1990), S. 421-424 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(90)90593-Z
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  • 6
    Electronic Resource
    Electronic Resource
    The Effect of SnO2 on the Photocatalytic Activity of Aerosol-Made TiO2 Particles (1999)
    Springer
    Journal of materials synthesis and processing 7 (1999), S. 357-363 
    Details
    ISSN: 1573-4870
    Keywords: Composite particles ; photodegradation ; titanium dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ultrafine titania particles were prepared by gas-phase oxidation of titanium tetrachloride in a high-temperature tubular aerosol flow reactor. Homogeneous precipitation method was used to deposit SnO2 on the surface of lab-made TiO2. The composite particles were characterized by TEM, ICP, XRD, and BET surface area analysis. The composite particles, pure ultrafine TiO2, commercial TiO2, and pure SnO2 were employed for photocatalytic degradation of azo dye active red X-3B in aerated solutions. The result showed that the photoactivity of the composite particles was higher than that of pure ultrafine TiO2 and commercial TiO2, and the optimum loading of SnO2 on TiO2 is 15.3%. The enhanced degradation rate of X-3B using SnO2-TiO2 composite particles was attributed to increased charge separation in these systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021813913299
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  • 7
    Electronic Resource
    Electronic Resource
    Precipitations in an Yttrium-Containing Low-Expansion Superalloy (1998)
    Springer
    Journal of materials science 33 (1998), S. 5069-5077 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The resistance to stress-accelerated grain-boundary oxygen embrittlement and notch-bar rupture strength in Fe–Ni–Co–Nb–Ti low-expansion superalloy has been improved significantly by trace yttrium addition. The precipitates in the matrix as well as along the grain boundaries have been studied systematically. The platelet precipitates in the matrix and along the grain boundaries have a hexagonal crystal structure (space group, P6/mmm) with lattice parameters a = 0.498 nm and c = 0.408 nm. The crystallographic orientation relationship between the phase and the matrix is found to be $$(\overline 1 {\text{ }}\overline 1 1 )_\gamma //(0 0 0 1)_H ,[\overline 1 1 0]_\gamma //[1 1 \overline 2 0]_H $$ . The semi-continuous discrete precipitates along the grain boundaries have an orthorhombic crystal structure with lattice parameters a = 0.45 nm, b = 0.80 nm and c = 1.20 nm. High-resolution images show that the interface between the precipitates and the matrix is semicoherent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004475428066
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  • 8
    Electronic Resource
    Electronic Resource
    A new phase in TiB2-reinforced Ni–Al–Fe matrix composite (1998)
    Springer
    Journal of materials science 33 (1998), S. 1183-1187 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure of TiB2-particle-reinforced Ni–Al–Fe matrix composite has been investigated by means of transmission electron microscopy, energy-dispersive X-ray analysis and high-resolution electron microscopy. The dendritic phase is found to be Fe(Ni, Al, Ti), which has a body-centred cubic crystal with lattice parameter a=1.068 nm. High-resolution images indicate that the Fe(Ni, Al, Ti) phase bonds the matrix very well. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004369424528
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  • 9
    Electronic Resource
    Electronic Resource
    High mass material (〉104 daltons) in a coal liquefaction extract, by laser-desorption mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 364-367 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The use of a laser-desorption mass spectrometer to examine a coal liquefaction extract known to contain high-molecular-mass material (from size-exclusion chromatography) has shown the presence of components of molecular mass in excess of 104Da for the first time. The molecules detected differ from each other in molecular mass by a few hundred or a few thousand Da. These preliminary results indicate that the basic coal-structure molecules probably consist of aromatic clusters on a chin, in reasonable agreement with current theories of coal structure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290050807
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of molecular masses up to 270 000 u in coal and coal-derived products by matrix-assisted laser desorption mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 795-799 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Molecular masses up to 270 000 u have been observed during matrix-assisted laser desorption mass spectroscopy on a sample of bituminous coal; the major fraction of desorbed ions appeared between m/z values of 800 and 5000. Similar mass distributions have been found in a coal-liquefaction extract and a pyrolysis tar. The highest molecular masses identified in this work far exceed previously reported high molecular masses found in coal-derived products (12 000 u), which were also detected by laser-desorption mass spectrometry.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070903
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