GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Study of dangling bonds in nanometer-sized granulet silicon nitride by electron-spin resonance (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6313-6316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dangling bonds in pellets made by compacting nanometer-sized silicon nitride (NASN) grains are studied by electron-spin resonance (ESR). The ESR results of NASN show that the number of dangling bonds in NASN is about three orders of magnitude higher than that of coarse-grained silicon nitride. It is also observed that compaction pressure and thermal treatment temperature affect the type and the number of dangling bonds. An explanation is presented for the changes in the dangling bonds caused by the processes of compaction and thermal treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355152
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Internal friction and modulus of nano-ZrO2 solids (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3447-3450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The internal friction (IF) and elastic modulus were measured for bulk samples of nano-ZrO2 from −200 °C to room temperature. An IF peak located on a high background was found for as-compacted bulk nano-ZrO2. At the same time, a large modulus defect appeared. After annealing, the IF background decreased substantially and both the IF peak and the modulus defect disappeared. When the sample was heat treated according to the schedule 700 °C/15 h+900 °C/21 h+1100 °C/18 h, the modulus jumped a factor of 2 comparison with the modulus of an as-compacted sample. The modulus of as-compacted nano-ZrO2 was higher than that of coarse-grained ZrO2 at low temperature. The origin of the IF peak is associated with the atomic relaxation in boundaries. The dramatic increase of the modulus for the annealed nano-ZrO2 is mainly induced by the enhancement of the binding force and the decrease of the mobility of atoms and bonds in boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351418
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Luminescence of nanometer-sized amorphous silicon nitride solids (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5185-5188 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The energy levels of defect states in nanometer-sized amorphous silicon nitride solids were systematically studied in terms of ultraviolet emission spectra. Six emission bands were observed, corresponding to 3.2, 2.8, 2.7, 2.4, 2.3, and 2.0 eV, respectively. With increasing the heat-treated temperature from room temperature to 1000 °C in low vacuum, these emission bands became high. For the specimen heated at 1000 °C, a new emission band of 3.0 eV appeared. The appearance of these emission bands is closely related to the formation of the energy levels of the defect states in the energy gap. The origin of these emission bands are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353796
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thermal desorption in nanocrystalline TiO2 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1186-1189 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline TiO2 powder with a grain size of 9.8 nm was prepared by the hydrothermal precipitation method. Thermal desorption in the powder and compacted TiO2 samples has been studied by differential scanning calorimetry and thermogravimetric analysis. An endothermic peak was observed on these samples and the peak can be attributed to thermal desorption. The desorption enthalpy per gram of adsorbates in the compacted sample is larger than that in the powder one and it continues to increase with the compacting pressure. A tentative model has been proposed to explain the increase in desorption enthalpy due to compaction. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363727
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence associated with Fe3+ ions in nanostructured Al2O3 (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5453-5456 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluorescence phenomena of nanostructured Al2O3 without doping and after doping of nano-Fe2O3 (4.61 and 48.01 wt %) were systematically investigated. The results show that a new fluorescence band with a peak position of about 17 500 cm−1 occurs for boehmite, η-Al2O3 and γ-Al2O3 and it disappears for α-Al2O3. This band can be attributed to fluorescence of Fe3+ in the systems with low-order degree (boehmite, η- and γ-Al2O3 and interfaces), which arises from 6A1→4T1 d5 electron transitions of Fe3+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357203
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Ultraviolet (340–390 nm), room temperature, photoluminescence from InAs nanocrystals embedded in SiO2 matrix (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2586-2588 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: InAs nanocrystals embedded in SiO2 matrix have been fabricated by a radio-frequency magnetron co-sputtering technique without postannealing. X-ray photoelectron spectra and Raman spectroscopy strongly suggest the existence of InAs nanocrystals in the SiO2 matrix. From the optical absorption spectrum, the absorption edge exhibits a very large blueshift of 3.3 eV with respect to that of bulk InAs. The double-peak ultraviolet photoluminescence is observed. Our experimental results show that this double-peak phenomenon originates from the radiative recombination of the quantum-confined electron-heavy hole excitons and electron-split-off hole excitons. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118926
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Reversible transition between transparency and opacity for the porous silica host dispersed with silver nanometer particles within its pores (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2980-2982 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The porous silica dispersed with silver nanometer particles (about 3 nm) within its pores (cages) has been prepared by a new method. In the process of alternative exposure to the ambient air and annealing, this material assumes reversible transition between transparency and opacity. This can be explained by oxidation of the outer part of the Ag particles during exposure to the ambient air and dissociation of the oxide during annealing in air. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117750
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Optical measurements of oxidation behavior of silver nanometer particle within pores of silica host (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1705-1710 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The oxidation behavior of silver (Ag) nanometer particles (about 3 nm in diameter) within pores of a silica host in ambient air (298 K) was investigated from optical absorption measurements. Thermodynamic analysis indicates that Ag nanoparticles can be oxidized in air at room temperature. Exposure to air results in a blueshift of the absorption edge with time, which is attributed to the surface oxidation of Ag nanoparticles. On this basis, we present a new method to investigate the oxidation process of Ag nanoparticles. Further experiments show that in air at room temperature oxidation occurs in surface layers of Ag particles in the form of a dense Ag2O film. Once the dense film is formed, further oxidation is restrained. A high relative humidity in the air results in fast surface oxidation. In air with a relative humidity 80% at room temperature, a dense film can be formed in 2 h. When the relative humidity is 〈30%, no measurable oxidation was found even after several months. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366888
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Composition modulation of optical absorption in AgxAu1−x alloy nanocrystals in situ formed within pores of mesoporous silica (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1572-1574 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanoscaled AgxAu1−x (0.2〈x〈0.8) alloy particles were synthesized by putting gold and silver particles into pores of monolithic mesoporous silica by soaking and annealing method. It has been found that in optical absorption spectrum, the surface plasmon resonance (SPR) maximum of AgxAu1−x alloy particles can shift from about 524 nm (SPR maximum of Au nanoparticles) to about 400 nm (SPR maximum of Ag nanoparticles) with increasing concentration of Ag in AgxAu1−x alloy particle. The simulation of optical absorption spectrum of AgxAu1−x alloy particles was conducted based on Mie theory. The calculated values are found to be consistent with the experimental results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372053
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Optical absorption of ZnS nanocrystals inside pores of silica (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3697-3699 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical absorption of ZnS semiconductor nanocrystals inside pores of silica has been investigated. These ZnS nanoparticles were synthesized through sol–gel processing, followed by firing. X-ray diffraction and nitrogen adsorption/desorption results show that the ZnS nanocrystals are highly defective. Based on the analysis of x-ray and nitrogen adsorption–desorption results, the surface layers of ZnS nanocrystals can be regarded as being amorphous. It was found that, compared with that of the bulk ZnS, the optical absorption edge of ZnS nanoparticles shifts to a longer wavelength. We believe that the amorphous surface layers of ZnS nanocrystals can mainly be responsible for the observed redshift of the optical absorption edge. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120485
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...