Electron microscopy investigation of gallium oxide micro/nanowire structures synthesized via vapor phase growth

Micron ◽  
2004 ◽  
Vol 35 (6) ◽  
pp. 447-453 ◽  
Author(s):  
Y. Wang ◽  
J. Xu ◽  
R.M. Wang ◽  
D.P. Yu
Keyword(s):  
Electron Microscopy ◽  
Vapor Phase ◽  
Gallium Oxide ◽  
Phase Growth ◽  
Vapor Phase Growth ◽  
Microscopy Investigation ◽  
Electron Microscopy Investigation

Micro and Nano Silver-Graphene Composite Manufacturing via Horizontal Vapor Phase Growth (HVPG) Technique

2017 ◽  
Vol 901 ◽  
pp. 3-7 ◽  
Author(s):  
Muhammad Akhsin Muflikhun ◽  
Gwen B. Castillon ◽  
Gil Nonato C. Santos ◽  
Alvin Y. Chua
Keyword(s):  
Electron Microscopy ◽  
Vapor Phase ◽  
Horizontal Temperature Gradient ◽  
Phase Growth ◽  
Composite Manufacturing ◽  
X Ray ◽  
Layer Graphene ◽  
Graphene Composite ◽  
Vapor Phase Growth ◽  
Scanning Electron

In this study, nanosilver-graphene composites were successfully manufactured via the horizontal vapor phase growth (HVPG) technique. A quartz tube loaded with the starting material, equal masses silver (Ag) powder and multi-layer graphene (Ge), was evacuated to ~10-6 Torr, sealed, and then baked at 1200°C for 6 hours, with its orientation such that a horizontal temperature gradient was generated across the tube. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analysis revealed variations in the structure and composition of the nanomaterials deposited on different regions of the tube, and the diameter of the nanomaterials was found to decrease with decreasing temperature.

scholarly journals Synthesis and Characterization of Gallium Oxide/Tin Oxide Nanostructures via Horizontal Vapor Phase Growth Technique for Potential Power Electronics Application

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Lester D. Bernardino ◽  
Gil Nonato C. Santos
Keyword(s):  
Power Electronics ◽  
Vapor Phase ◽  
Gallium Oxide ◽  
High Mobility ◽  
Potential Candidate ◽  
Sno2 Nanostructures ◽  
Phase Growth ◽  
Vapor Phase Growth ◽  
Hall Effect Measurements ◽  
The Fourier Transform

The monoclinic β-gallium oxide (Ga2O3) was viewed as a potential candidate for power electronics due to its excellent material properties. However, its undoped form makes it highly resistive. The Ga2O3/SnO2 nanostructures were synthesized effectively via the horizontal vapor phase growth (HVPG) technique without the use of a magnetic field. Different concentrations of Ga2O3 and SnO2 were varied to analyze and describe the surface morphology and elemental composition of the samples using the scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy, respectively. Meanwhile, the polytype of the Ga2O3 was confirmed through the Fourier transform infrared (FTIR) spectroscopy. The current-voltage (I–V) characteristics were established using a Keithley 2450 source meter. The resistivity was determined using the van der Pauw technique. The mobility and carrier concentration was done through the Hall effect measurements at room temperature using a 0.30-Tesla magnet. It was observed that there was an increase in the size of the nanostructures, and more globules appeared after the concentration of SnO2 was increased. It was proven that the drop in the resistivity of Ga2O3 was due to the presence of SnO2. The data gathered were supported by the Raman peak located at 662 cm−1, attributed to the high conductivity of β-Ga2O3. However, the ε-polytype was verified to appear as a result of adding SnO2. All the samples were considered as n-type semiconductors. High mobility, low power loss, and low specific on-resistance were attained by the highest concentration of SnO2. Hence, it was clinched as the optimal n-type Ga2O3/SnO2 concentration and recommended to be a potential substrate for power electronics application.

scholarly journals Understanding the local structure of disordered carbons from cellulose and lignin

2021 ◽  
Author(s):  
Yujie Meng ◽  
Cristian I. Contescu ◽  
Peizhi Liu ◽  
Siqun Wang ◽  
Seung-Hwan Lee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Treatment Temperature ◽  
Graphite Sheet ◽  
Transmission Electron ◽  
Microscopy Investigation ◽  
Electron Microscopy Investigation ◽  
Scanning Transmission ◽  
Disordered Carbon ◽  
Biomass Components ◽  
Softwood Kraft Lignin

AbstractAn electron microscopy investigation was performed to understand the relationship between the microstructure and properties of carbonized cellulose and lignin (softwood kraft lignin) relative to the structure of the original biomass components. Structure details at micro- and molecular levels were investigated by scanning transmission electron microscopy. Atomic-resolution images revealed the presence of random disordered carbon in carbonized cellulose (C-CNC) and of large domains of well-ordered carbon with graphite sheet structure in carbonized lignin (C-Lignin). These structural differences explain why C-CNC exhibits higher surface area and porosity than C-Lignin. The presence of certain well-ordered carbon in carbonized lignin indicates some of the carbon in lignin are graphitized with heat treatment temperature up to 950 °C. This result is encouraging for future endeavors of attaining acceptable modulus of carbon fiber from lignin given suitable modifications to the chemistry and structure of lignin. The results of this research contribute to an improved understanding of the carbonization mechanism of the key cellulose and lignin components of biomass materials.

scholarly journals Structural and chemical characterization of MoO2/MoS2 triple-hybrid materials using electron microscopy in up to three dimensions

2021 ◽  
Author(s):  
Anna Frank ◽  
Thomas Gänsler ◽  
Stefan Hieke ◽  
Simon Fleischmann ◽  
Samantha Husmann ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Chemical Characterization ◽  
Three Dimensions ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Microscopy Investigation ◽  
Electron Microscopy Investigation ◽  
Carbon Nanotube Network ◽  
Core Shell Nanoparticles

This work presents the synthesis of MoO2/MoS2 core/shell nanoparticles within a carbon nanotube network and their detailed electron microscopy investigation in up to three dimensions. The triple-hybrid core/shell material was...

Tailored Vapor-Phase Growth of CuxO–TiO2(x= 1, 2) Nanomaterials Decorated with Au Particles

Langmuir ◽  
2011 ◽  
Vol 27 (10) ◽  
pp. 6409-6417 ◽  
Author(s):  
Davide Barreca ◽  
Giorgio Carraro ◽  
Alberto Gasparotto ◽  
Chiara Maccato ◽  
Oleg I. Lebedev ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Phase Growth ◽  
Vapor Phase Growth
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