Preparation and characterization of Cd(S,Se) films via the selenium-vapor-assisted annealing process

2012 ◽  
Vol 543 ◽  
pp. 84-89 ◽  
Author(s):  
Hao-Yu Cheng ◽  
Jeng-Shin Ma ◽  
Chung-Hsin Lu
Keyword(s):  
Annealing Process ◽  
Selenium Vapor

Improved Capacitive Behavior of Birnessite Type Mn Oxide Coated on Activated Carbon Fibers

2021 ◽  
Author(s):  
Zahra Abedi ◽  
Desiree Leistenschneider ◽  
Douglas Ivey ◽  
Weixing Chen
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Hydrothermal Process ◽  
Total Pore Volume ◽  
Annealing Process ◽  
Activated Carbon Fibers ◽  
Capacitive Behavior ◽  
Mn Oxide ◽  
Reducing Environment

Abstract Birnessite type Mn oxide (potassium birnessite hydrate) powder (as-δ-MnO2) with a layered microstructure was prepared via a hydrothermal process. To improve its capacitive performance, the microstructure was thermally modified (annealed) at 400 oC (400-δ-MnO2) in a N2 reducing environment. By removing the hydrated cations (K+) layers inserted between the main layers of birnessite, damaging the microstructure, intercalation/deintercalation of the electrolyte species (Li+1) became more effective. Characterization of as-δ-MnO2 and 400-δ-MnO2 revealed that no phase transformation occurred during the annealing process. The microstructure became less crystalline and the total pore volume increased from 0.20 cm3 g-1 to 0.43 cm3 g-1, while the oxidation state of Mn remained 4+ after annealing the as-δ-MnO2 at 400 oC. The 400-δ-MnO2 sample was then coated on asphaltene derived activated carbon fibers (ACF-400-δ-MnO2) to improve the performance by making use of the high electrical conductivity and capacitive behavior of ACF. Coating the 400-δ-MnO2 sample led to a significant increase in the capacitance (328 F g-1 and 195 F g-1 for ACF-400-δ-MnO2 and 400-δ-MnO2 at 0.4 A g-1, respectively), improved energy and power values (~7 kW kg-1 at ~4.2 Wh kg-1 for ACF-400-δ-MnO2 and 240 W kg-1 at 2.4 Wh kg-1 for 400-δ-MnO2) and improved cycling behavior.

Synthesis and Characterization of Boron Nitride Nanotubes-Polycaprolactone Nanocomposite

2019 ◽  
Vol 951 ◽  
pp. 39-44 ◽  
Author(s):  
Akesh Babu Kakarla ◽  
Cin Kong ◽  
Wei Kong ◽  
Ing Kong
Keyword(s):  
Boron Nitride ◽  
Polymer Matrix ◽  
Boron Nitride Nanotubes ◽  
Annealing Process ◽  
Morphological Observation ◽  
Mechanical And Thermal Properties ◽  
Thermal Curing ◽  
Boron Powder ◽  
Co Precipitation

This work aimed to investigate the effects of boron nitride nanotubes (BNNTs) on the mechanical and thermal properties of BNNT-polycaprolactone (PCL) nanocomposites. BNNTs were synthesized via co-precipitation and annealing process by using amorphous boron powder as a precursor. PCL-BNNT nanocomposites were prepared by using sonication and thermal curing. Their morphology, thermal and tensile properties were characterized. Morphological observation revealed that BNNTs were arbitrarily and evenly dispersed within the PCL which indicated a good dispersion of the nanotubes in polymer matrix. Both the thermal stability and mechanical properties of neat PCL were enhanced with the addition of BNNTs to polymer matrix, in particular the tensile strength of PLC was increased by 101% with the addition of 5 wt% nanofillers.

Electrochemical Characterization of Metal Oxynitride Thin Film as New Lithium Storage Materials

2011 ◽  
Vol 295-297 ◽  
pp. 912-916 ◽  
Author(s):  
Yong Ning Zhou ◽  
Zheng Wen Fu
Keyword(s):  
Thin Film ◽  
Reaction Mechanism ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Reaction ◽  
Annealing Process ◽  
Lithium Storage ◽  
X Ray ◽  
Dc Sputtering ◽  
Selected Area Electron Diffraction

Metal oxynitride (VxON, CrxON) thin film has been fabricated by reactive dc sputtering method and annealing process. Its electrochemical properties are investigated in a MxON/Li cell. The reversible specific capacities are around 830 mAh g-1 for VxON and 730 mAh g-1 for CrxON. By using selected-area electron diffraction and X-ray photoelectron spectroscopy measurements, New electrochemical reaction mechanism is uncovered, which should be responsible for its good electrochemical performance.

Fabrication and characterization of freestanding NiMnGa films

2003 ◽  
Vol 785 ◽  
Author(s):  
Holger Rumpf ◽  
Corneliu Craciunescu ◽  
Jürgen Feydt ◽  
Achim Gilles ◽  
Manfred Wuttig ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Magnetic Measurements ◽  
Annealing Process ◽  
Rapid Thermal Annealing Process ◽  
Scanning Calorimetry ◽  
Rapid Annealing ◽  
Thermal Annealing Process ◽  
Ferromagnetic Hysteresis ◽  
Post Deposition

ABSTRACTFreestanding Ni50Mn30Ga20 films of 13 μm thickness were fabricated by DC magnetron sputtering and analyzed. Magnetic measurements revealed the influence of the post deposition rapid thermal annealing process on the ferromagnetic hysteresis. Ferromagnetic properties evolved after annealing at 400°C. Thermal annealing of at least 600°C led to polycrystalline films that transformed reversibly and martensitically as shown by structural analysis and differential scanning calorimetry. Transformation temperatures and enthalpies of transformation of the martensitic transformation were strongly influenced by the temperature of the rapid annealing process. It is proposed that the annealing data reflect the evolution of the crystalline state.

Growth and Characterization of PZT Thin Films

2008 ◽  
Author(s):  
Daqun Bao ◽  
Yi Zhang ◽  
Hang Guo
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Annealing Process ◽  
Pzt Thin Films ◽  
X Ray ◽  
Crystallographic Structures ◽  
Strain Equation

This paper presents the growth and characterization of PZT thin films by using the sol-gel technology. In this paper, we study the influences of annealing process and different substrates on the orientation and crystalline quality of PZT thin films. The crystallographic structures are tested by using X-ray diffractometer (XRD), and the residual stresses of PZT thin films are obtained by calculation from a derived stress-strain equation in XRD analysis. Moreover, surface morphology and microstructure of the films are investigated by using AFM and SEM, and the polarization hysteresis of PZT thin films is measured by using a Sawyer Tower circuit. The results show that PZT thin films prepared by using the sol-gel method have good properties and can be used for developing PZT-based micro and nano devices.

Fabrication, Processing and Characterization of Thin Film ZnO for Integrated Optical Gas Sensors

2009 ◽  
Vol 1201 ◽  
Author(s):  
Eliana Kamińska ◽  
Anna Piotrowska ◽  
Iwona Pasternak ◽  
Marek Ekielski ◽  
Krystyna Gołaszewska ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Columnar Structure ◽  
Annealing Process ◽  
Zno Films ◽  
Reactive Magnetron ◽  
Nitrogen Flow ◽  
Integrated Optical ◽  
Quartz Substrates ◽  
Propagation Properties

AbstractZinc oxide layers deposited on quartz substrates by means of RF reactive magnetron sputtering with subsequent RTP annealing in a nitrogen flow at 400°C and in an oxygen flow at 500°C have been investigated in applications to waveguide structures. The ZnO films reveal a highly c-oriented columnar structure with a surface roughness of 4.3 nm. Annealing causes a significant increase of the lattice constant to the value of 5.210±0.001 Å suggesting the relaxation of the stress in the film. The annealing process causes a significant improvement of propagation properties of the fabricated waveguide structures in comparison to structures using as-deposited ZnO films. The minimal attenuation coefficient of the 630 nm thick films was found to be 2.8 and 3.0 dB/cm for TE0 and TM0 modes respectively.

Preparation and characterization of composites based on poly(lactic acid)/poly(methyl methacrylate) matrix and sisal fiber bundles: The effect of annealing process

2020 ◽  
pp. 089270572093078
Author(s):  
Ander Orue ◽  
Jon Anakabe ◽  
Ane Miren Zaldua-Huici ◽  
Arantxa Eceiza ◽  
Aitor Arbelaiz
Keyword(s):  
Lactic Acid ◽  
Methyl Methacrylate ◽  
Polymer System ◽  
Annealing Process ◽  
Sisal Fiber ◽  
Maximum Temperature ◽  
Poly Lactic Acid ◽  
Poly Methyl Methacrylate ◽  
Sisal Fibers

The interest on poly(lactic acid) (PLA)/poly(methyl methacrylate) (PMMA) blends has increased during the last years due to their promising properties. The novelty of the current work focuses on the preparation and characterization of biocomposites based on PLA/PMMA matrix and NaOH-treated sisal fibers. The effect of the addition of treated sisal fibers on the physico-mechanical properties of high polylactide content composites was studied. For this purpose, PLA/PMMA blend (80/20 wt%) was prepared by melt-blending and reinforced with different fiber contents. Although composites showed interesting specific tensile properties, the estimated heat deflection temperature (HDT), that is, the maximum temperature at which a polymer system can be used as a rigid material, barely increased 4°C respect to unreinforced system. After the annealing process, the HDT of the unreinforced polymer blend increased around 25°C, whereas the composites showed an increase of at least 38°C. Nonetheless, the specific tensile strength of composite decreased approximately 48% because the adhesion between fiber and polymer matrix was damaged and cracks were formed during annealing process.

Electrochemical characterization of Al84Ni9Y7 metallic glass after annealing process

2019 ◽  
Vol 518 ◽  
pp. 24-35
Author(s):  
Rafał Babilas ◽  
Anna Bajorek ◽  
Monika Spilka ◽  
Wojciech Łoński ◽  
Dawid Szyba
Keyword(s):  
Metallic Glass ◽  
Annealing Process ◽  
Electrochemical Characterization

Growth and characterization of combined single-crystalline and polycrystalline CVD diamond wafer

2015 ◽  
Vol 1734 ◽  
Author(s):  
A.L. Vikharev ◽  
A.B. Muchnikov ◽  
D.B. Radishev ◽  
V.A. Isaev ◽  
O.A. Ivanov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Cvd Diamond ◽  
Annealing Process ◽  
Single Crystalline ◽  
Chemical Vapor Deposited ◽  
Thermal Annealing Process ◽  
Industrial Use

ABSTRACTThe study of combined single-crystalline and polycrystalline chemical vapor deposited (CVD) diamond wafers is reported. Combined CVD diamond wafers up to 75 mm in diameter were grown, which consist of great number of single-crystalline diamond sections grafted in a polycrystalline diamond matrix. The grown combined CVD wafers were characterized by the Raman spectroscopy. It was shown that in the grafting process, the single- and polycrystalline areas of the combined wafer undergo insignificant stresses, which can be released during the thermal annealing process. Fabricated combined CVD diamond can be used in various applications that employ unique properties of diamond and potentially suitable for industrial use.

Effects of Deformation and Annealing Temperature on the Microstructures and Hardness of Cu-29Zn-0.6Bi Brass

2017 ◽  
Vol 748 ◽  
pp. 218-223 ◽  
Author(s):  
Imam Basori ◽  
Ruther Gadhu ◽  
Bondan Tiara Sofyan
Keyword(s):  
Grain Size ◽  
Hardness Measurement ◽  
Optical Microscope ◽  
Annealing Process ◽  
Gravity Casting ◽  
Slip Mechanism ◽  
Cold Rolled ◽  
Negative Impacts ◽  
Characterization Of Materials

The use of lead-free brass is growing due to the restriction of the lead content in many components. Bismuth replaces lead in the brass alloys and contributes to the machinability and pressure tightness characteristics. However, Bi is immiscible in copper and fills the inter-dendritic spaces during solidication that yields negative impacts on the mechanical properties. This research studied the effects of addition of 0.6 wt. % Bi on the characteristics of Cu-29Zn alloy during cold rolling and subsequent annealing process. The Cu-29Zn-0.6wt.%Bi alloy was produced by gravity casting in a metal mold with the dimension of 110x110x6 mm3. The as-cast plate was homogenized at 800 °C for 2 hours and then cold rolled with the level of deformation of 20, 40 and 70 % in multiple passes. The samples with 70% deformation was annealed at 350, 400 and 450 °C for 15 minutes. Characterization of materials included Vickers hardness measurement and microstructural observation by using optical microscope and SEM. The results showed that addition of Bi reduced the grain size, formed discrete globules in the interdendritic areas and increased the hardness. The globules as dispersoid bismuth deformed and filled intergranular spaces during rolling and promoted the formation of cross slip mechanism at the 20% deformation. At the 40% deformation, the globules led to more closely spaced twin lamellae and increased the twinning density. The phenomena created an inhomogeneous deformation and promoted the formation of shear band. Annealing process dispersed the Bi globules into tight structures along the grain boundaries.The presence of dispersed bismuth increased the rate of recrystallization during annealing due to the increased in potential site for nucleation. In contrast, the dispersed bismuth acted as the pinning agent that inhibited the grain growth and developed smaller grain size which resulted in higher hardness.

Sign in / Sign up

Export Citation Format

Share Document