Phase Transformation of Germanium Ultrafine Particles at High Temperature

1995 ◽  
Vol 405 ◽  
Author(s):  
S. Nozaki ◽  
S. Sato ◽  
H. Ono ◽  
H. Morisaki ◽  
M. Iwase
Keyword(s):  
Phase Transformation ◽  
Ultrafine Particles ◽  
Uv Light ◽  
Liquid Nitrogen Temperature ◽  
Cluster Beam ◽  
Diamond Structure ◽  
Double Peak ◽  
Photo Oxidation ◽  
Evaporation Technique ◽  
Gas Evaporation Technique

AbstractGermanium (Ge) films were deposited on substrates whose temperature was kept at room (Ge-RT) or liquid nitrogen temperature (Ge-LNT) by the cluster-beam evaporation technique. The Raman spectra of both films with a double peak suggest that the crystal structure is not the ordinary diamond but the tetragonal one. The critical temperature for the phase transformation from the tetragonal into the diamond structure is found much higher than that for the Ge nanostructures deposited by the gas-evaporation technique. The Ge-LNT sample exhibits photooxidation and photoluminescence (PL) when it is exposed to the UV light. Their PL and optical absorption characteristics are strongly influenced by a combination of the photo-oxidation and thermal annealing treatments.

Blue Light Emission from Germanium Ultrafine Particles by the Gas Evaporation Technique

1994 ◽  
Vol 358 ◽  
Author(s):  
Shinji Nozaki ◽  
S. Sato ◽  
A. Denda ◽  
H. Ono ◽  
H. Morisaki
Keyword(s):  
Blue Light ◽  
Ultrafine Particles ◽  
Light Emission ◽  
Uv Light ◽  
Hydrogen Atmosphere ◽  
Pure Hydrogen ◽  
Blue Light Emission ◽  
Long Time ◽  
Evaporation Technique ◽  
Gas Evaporation Technique

ABSTRACTThe ultrafine particles with diameters in the order of 10 nm were deposited onto Si and SiO2 substrates by evaporation of Ge in a pure hydrogen atmosphere. Although the as-deposited Ge ultrafine particles do not show any detectable luminescence, they emit blue light after being exposed to the UV light for a long time. The blue light is strong enough to be seen with the naked eye even under a room light. The photooxidation, unique to the Ge ultrafine particles, has been identified as a major factor contributing to the blue light emission.

Study of Electrical Properties of Ge-Nanocrystalline Films Deposited by Cluster-Beam Evaporation Technique

1998 ◽  
Vol 536 ◽  
Author(s):  
Souri Banedjee ◽  
H. Ono ◽  
S. Nozaki ◽  
H. Morisaki
Keyword(s):  
Electrical Properties ◽  
Liquid Nitrogen ◽  
Coulomb Blockade ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Cluster Beam ◽  
Nanocrystalline Films ◽  
Current Voltage ◽  
Evaporation Technique

AbstractRoom temperature current-voltage (I-V) characteristics were studied across the thickness of the Ge nanocrystalline films, prepared by the cluster beam evaporation technique. The films thus prepared are deposited either at room temperature (Ge-RT) or at liquid nitrogen temperature (Ge-LNT). Ge-LNT nanofilm is subjected to oxidation while Ge-RT did not get oxidized. Steps were observed in the I-V characteristics of the thin Ge- LNT samples suggesting the Coulomb Blockade effect.

Formation of Ultrafine Particles by Gas-Evaporation Technique. V. Silicon and Germanium in Argon

1978 ◽  
Vol 17 (2) ◽  
pp. 291-297 ◽  
Author(s):  
Yahachi Saito ◽  
Shigeki Yatsuya ◽  
Kazuhiro Mihama ◽  
Ryozi Uyeda
Keyword(s):  
Ultrafine Particles ◽  
Evaporation Technique ◽  
Silicon And Germanium ◽  
Gas Evaporation Technique

A Collection Method for Ultrafine Particles Produced by the Gas Evaporation Technique

1991 ◽  
Vol 30 (Part 1, No. 3) ◽  
pp. 559-560 ◽  
Author(s):  
Chihiro Kaito ◽  
Yukio Yoshimura ◽  
Yoshio Saito
Keyword(s):  
Ultrafine Particles ◽  
Collection Method ◽  
Evaporation Technique ◽  
Gas Evaporation Technique
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