Factors affecting two-dimensional dopant profiles obtained by transmission electron microscopy of etched p-n junctions in Si

1998 ◽  
Vol 16 (1) ◽  
pp. 471 ◽  
Author(s):  
Suneeta S. Neogi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Two Dimensional ◽  
Factors Affecting ◽  
Transmission Electron ◽  
Dopant Profiles

scholarly journals Designing Magnetic Layered Double Hydroxides and Two-Dimensional Magnetic Nano-Nets of Cobalt Ferrite through a Novel Approach

2018 ◽  
Vol 8 (11) ◽  
pp. 2099 ◽  
Author(s):  
Osama Saber ◽  
Abdullah Aljaafari ◽  
Sarah Asiri ◽  
Khalid Batoo
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Layered Double Hydroxides ◽  
Cobalt Ferrite ◽  
High Coercivity ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Double Hydroxides

The present study has a dual aim of supporting magnetic nanoparticles over the nanolayers of LDHs and designing two-dimensional magnetic nano-nets of cobalt ferrite. In this trend, nanoparticles of CoFe2O4 were prepared and supported by Co-Fe LDH through urea hydrolysis. The nanolayered structures of Co-Fe LDH were confirmed by X-ray diffraction, energy-dispersive X-ray spectrometry, FT-IR spectra, thermal analyses, and transmission electron microscopy. In addition, they indicated that 13.2% CoFe2O4 were supported over Co-Fe LDH. Transformation of the nanolayered structures of Co-Fe LDH to nano-nets was achieved by the catalytic effect of the supported CoFe2O4 nanoparticles through solvent thermal technique. X-ray diffraction patterns and transmission electron microscopy images confirmed the transformation of the supported Co-Fe LDH to nano-nets of cobalt ferrite. In order to indicate the effect of the LDH for designing the nano-nets, nanoparticles of cobalt ferrite were prepared by the same technique without LDH. The magnetic behavior of the nano-nets and the supported Co-Fe LDH were measured and compared with the nanoparticles through vibrating sample magnetometer technique. The magnetic parameters indicated that the prepared nano-nets have ferromagnetic behavior and high coercivity. However, the prepared nanoparticles revealed a superparamagnetic state and low coercivity. The experimental results concluded that the incorporation of nanoparticles with nanowires into nano-net structures has been found to be an efficient way to improve their magnetic properties and prevent their agglomerations. Finally, layered double hydroxides are an important source for constructing magnetic nanolayered structures and nano-nets.

Factors affecting Ge nanocrystal size in co-sputtered Ge+SiO2films

2000 ◽  
Vol 638 ◽  
Author(s):  
WK Choi ◽  
V Ng ◽  
YW Ho ◽  
TB Chen ◽  
V Ho
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Thermal Processing ◽  
Rapid Thermal Processing ◽  
Annealing Duration ◽  
Factors Affecting ◽  
Transmission Electron ◽  
Germanium Nanocrystals ◽  
Ge Nanocrystals

AbstractThe high resolution transmission electron microscopy and Raman spectroscopy results of germanium nanocrystals embedded in SiO2 synthesized by rapid thermal processing (RTA) have been presented. From the results of samples with different Ge concentrations, it was concluded that there is a narrow window in the Ge concentration that can produce nanocrystals. We also showed that it is possible to vary RTA duration or temperature to produce Ge nanocrystals with varying sizes. Our results therefore suggest that it is possible to utilize (i) annealing duration and; (ii) temperature to tune crystal sizes for optoelectronic applications.

In Situ Heating Transmission Electron Microscopy

MRS Bulletin ◽  
2008 ◽  
Vol 33 (2) ◽  
pp. 93-100 ◽  
Author(s):  
Hiroyasu Saka ◽  
Takeo Kamino ◽  
Shigeo Ara ◽  
Katsuhiro Sasaki
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Temperature Effects ◽  
Size Dependence ◽  
Factors Affecting ◽  
Fundamental Information ◽  
Transmission Electron ◽  
Solid Liquid Interface ◽  
Solid Liquid

AbstractTemperature is one of the most important factors affecting the state and behavior of materials. In situ heating transmission electron microscopy (TEM) is a powerful tool for understanding such temperature effects, and recently in situ heating TEM has made significant progress in terms of temperature available and resolution attained. This article briefly describes newly developed specimen-heating holders, which are useful in carrying out in situ heating TEM experiments. It then focuses on three main applications of these specimen holders: solid–solid reactions, solid–liquid reactions (including highresolution observation of a solid–liquid interface, size dependence of the melting temperatures of one-, two- and three-dimensionally reduced systems, size dependence of the contact angle of fine metal liquid, and wetting of Si with liquid Au or Al) and solid–gas reactions. These results illustrate the benefit of in situ heating TEM for providing fundamental information on temperature effects on materials.

SELF-ORGANIZED DISTRIBUTION OF EXTREMELY SMALL Ti QUANTUM DOTS IN SiO2

NANO ◽  
2007 ◽  
Vol 02 (03) ◽  
pp. 189-193 ◽  
Author(s):  
J. W. RABALAIS ◽  
J. P. ZHAO ◽  
D. X. HUANG ◽  
W. K. CHU
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Vacuum Annealing ◽  
Annealing Process ◽  
Two Dimensional ◽  
Uniform Size ◽  
Particle Spacing ◽  
Self Organized ◽  
Transmission Electron ◽  
Dimensional Distribution

Self-organized extremely small Ti nanodots have been formed in the subsurface of SiO 2 by implantation of isotopic 48 Ti + at a kinetic energy of 9 keV into (0001) Z-cut quartz, followed by a vacuum annealing process. Transmission electron microscopy (TEM) images show that the Ti nanodots have a two-dimensional distribution, i.e., a uniform size as small as 3.8 nm and relatively uniform positions with nearly constant inter-particle spacing of ~ 1.5 nm. A mechanism for the two-dimensional spatial distribution and the inhibition of chemical reactions between Ti and SiO 2 is discussed.

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