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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of aligned gallium nitride nanowire quasi-arrays (2000)
    Springer
    Applied physics 71 (2000), S. 349-350 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Ea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Self-aligned GaN nanowire quasi-arrays were synthesized on MgO crystal through a simple gas reaction method. They were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) spectroscopy and high-resolution transmission electron microscopy (HRTEM). FE-SEMimages showed that the product consisted of quasi-arrays of nanowires. XRD, EDX and HRTEM indicated that the nanowires were wurtzite GaN single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000607
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  • 2
    Electronic Resource
    Electronic Resource
    Morphologies of GaN one-dimensional materials (2000)
    Springer
    Applied physics 71 (2000), S. 587-588 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Ea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. GaN one-dimensional materials with different morphologies were formed on LaAlO3 crystal, silicon crystal and quartz glass substrates through a simple sublimation method. They were characterized by powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and energy-dispersive X-ray (EDX) spectroscopy. FE-SEM images showed that the morphologies of the one-dimensional materials included straight nanorods, curved nanowires, nanoribbons, zigzag nanorods and beaded or capture-tree nanorods. XRD and EDX studies indicated that all the one-dimensional materials were wurtzite GaN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000684
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of a quantum-confinement effect with GaN nanoparticles synthesized through a new gas reaction route (2000)
    Springer
    Applied physics 71 (2000), S. 229-231 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 71.55.Eq; 85.30.Vw; 78.55.-m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Spherical wurtzite GaN nanoparticles with diameters of 5–8 nm were synthesized through a new gas reaction route. The concave-surface-induced nucleation process based on the surface roughness of the substrate played an important role in the formation of quantum dots. Photoluminescence spectrum revealed the quantum-confined excited states in the nanoparticles with features at 3.73 eV (332 nm) and 3.85 eV (322 nm), which show significant blueshift compared with the band-gap emission from bulk GaN crystals. Four blue emission bands with low intensity, centered at 2.85 eV (435 nm), 2.75 eV (451 nm), 2.67 eV (464 nm), 2.62 eV (473 nm) respectively, were also observed. These blue bands may originate from surface states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050060
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  • 4
    Electronic Resource
    Electronic Resource
    Raman-scattering spectrum of GaN straight nanowires (2000)
    Springer
    Applied physics 71 (2000), S. 345-346 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Ea; 42.65.Dr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The Raman spectrum of GaN straight nanowires deposited on a LaAlO3 crystal substrate was studied. The E2 (high) phonon frequency at 560 cm-1 shows a 9 cm-1 shift compared with the calculated value. The low-energy shift and band broadening of the Raman modes result from the nanosize effect. The unique property of the low intensity ratio of IE2/IA1(LO) on the Raman spectrum from the GaN straight nanowires was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000602
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and photoluminescence characteristics of AlN nanocrystalline solids (2000)
    Springer
    Applied physics 71 (2000), S. 351-352 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 71.55.Eq; 73.61.Tm; 78.55.-m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A new condensed form of AlN nanocrystalline solids was obtained directly from reactions of metal Al and (NH4Cl+NH4I) in liquid ammonia at 550 °C, without the subsequent consolidation process as in the conventional method. The synthesized product is a transparent bulk solid, while the constituted nanocrystals have an average size of about 18 nm and possess the same wurtzite structure as bulk AlN. (NH4Cl+NH4I), which plays a role of a catalyst in the present synthetic route, is indispensable. The photoluminescence spectrum of the AlN nanocrystalline solids shows a broad blue band centered at 400 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000609
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  • 6
    Electronic Resource
    Electronic Resource
    A new method for synthesis of amorphous carbon nitride powders (2000)
    Springer
    Applied physics 71 (2000), S. 465-467 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Zx; 61.43.Dq; 87.64.Je
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Amorphous carbon nitride powders are successfully produced by ammonothermal synthetic routes. The existence of the chemical bonding of C≡N in the powders is confirmed by Raman and infrared spectra. Raman spectra of various samples show that the G-band frequency shifts to higher energies, and the intensity ratio ID/IG decreases as the N content increases. The Knoop hardness of the sintering sample is up to 1200 kgf/mm2. The hardness of the sample increases with increasing of the N content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000591
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    Paper (German National Licenses)
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