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Journal articles on the topic 'Scanning electron microscopy (MEB)'

Author: Grafiati

Published: 31 October 2023

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1

Rong, Yun Long, Shao Fei Wang, Dan Dan Jia, et al. "Preparation of Porous Carbon Material by Carbonizing Polyacrylonitrile Microspheres." Applied Mechanics and Materials 253-255 (December 2012): 884–87. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.884.

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PAN microspheres were crosslinked with divinyl benzene (DVB) and styrene (St), and then pre-oxidized under atmospheric pressure, porous carbon microspheres were produced by carbonizing the pretreated microspheres under nitrogen protection. Morphology and structure characterizations of the materials were performed by employing scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption test, etc. The results show that the primitive PAN microspheres display flower-like structures, while the carbonized pretreated PAN microspheres exhibit a high porosity as well

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2

Naggar, Ahmed H., Ahmed Kotb, Ahmed A. Gahlan, Mahmoud H. Mahross, Abd El-Aziz Y. El-Sayed, and Adel A. Abdelwahab. "Graphite Studded with Facile-Synthesized Cu2O Nanoparticle-Based Cubes as a Novel Electrochemical Sensor for Highly Sensitive Voltametric Determination of Mebeverine Hydrochloride." Chemosensors 9, no. 2 (2021): 35. http://dx.doi.org/10.3390/chemosensors9020035.

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Herein, a feasible chemical reduction method followed by intensive mixing was applied for the preparation of an attractive material based on graphite studded with cuprous oxide nanoparticle-based cubes (Cu2ONPs–C@G). Transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and cyclic voltammetry (CV) were utilized for characterization. Cuprous oxide nanoparticles (Cu2ONPs), with a diameter range mainly distributed from 4 to 20 nm, aggregate to form microcubes (Cu2ONPs–C) with an average diameter of about 367 nm. Paste electrode was prepared using Cu2O

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3

Vanfleet, R. R., D. Muller, H. J. Gossmann, and J. Silcox. "Antimony Delta Doping by Scanning Transmission Electron Microscopy and Electron Energy Loss Spectroscopy." Microscopy and Microanalysis 5, S2 (1999): 614–15. http://dx.doi.org/10.1017/s1431927600016391.

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MBE techniques allow the fabrication of exceptionally sharp compositional changes such as delta doped layers in semiconductors. Producing these spatially confined doped layers is critical to many innovative device designs. The spatial confinement of these delta doped structures can be less than the measurement resolution of the currently standard SIMS and RBS techniques. This allows only the upper limits on the layer width to be measured. These SIMS and RBS methods are also inadequate for the two dimensional information desired for future device design and development. More recently developed

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4

Guerrero, Gabriela Peñuelas, Ingrid Jiménez Cosme, Pilar Tapia López, et al. "Technical Study of a set of Metallic Artifacts from the Maya Site of Lagartero, Chiapas, Mexico." MRS Proceedings 1374 (2012): 125–35. http://dx.doi.org/10.1557/opl.2012.1383.

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ABSTRACTDuring the excavations made at a burial of the post-Classic Mayan period (1220-1521 A.D.) in the pyramid number 2 of the pre-Hispanic site of Lagartero, Chiapas, Mexico, a set of four small metallic artifacts depicting reptile’s heads, were recovered. The objects were in poor conservation conditions and were taken to the Metal Conservation Laboratory of the National School of Conservation (ENCRyM- INAH) for suitable cleaning and conservation treatments.Analyses allowed identifying important technological features such as gilding remains. The analytical techniques included optical micro

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5

TANAHASHI, Katsuto, Yuichi KAWAMURA, Naohisa INOUE, and Yoshikazu HOMMA. "Three Dimensional Growth in GaAs MBE Studied by in-situ Scanning Electron Microscopy." Hyomen Kagaku 19, no. 11 (1998): 747–51. http://dx.doi.org/10.1380/jsssj.19.747.

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6

Tanahashi, K., Y. Kawamura, N. Inoue, Y. Homma, and J. Osaka. "Surface-roughening processes in GaAs MBE studied by in situ scanning electron microscopy." Journal of Crystal Growth 188, no. 1-4 (1998): 205–10. http://dx.doi.org/10.1016/s0022-0248(98)00066-9.

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7

Lloret, Fernando, D. Araujo, M. P. Villar, L. Liu, and Konstantinos Zekentes. "Si NWs Conversion to Si-SiC Core-Shell NWs by MBE." Materials Science Forum 821-823 (June 2015): 965–69. http://dx.doi.org/10.4028/www.scientific.net/msf.821-823.965.

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Si nanowires (NWs) samples have been converted to silicon carbide (SiC) NWs at different conditions of substrate temperature in an ultra-high vacuum using a molecular beam epitaxy (MBE) set-up. Auger electron spectroscopy (AES) and reflection high-energy electron diffraction (RHEED) have been in-situ carried out to control the growth process. Scanning electron microscopy (SEM) and conventional transmission electron microscopy (CTEM) have been used to characterize the resulting nanostructures. In addition, the samples have been prepared by focused ion beam (FIB) in order to have electron-transp

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8

Aguilera Mandujano, A., and J. Serrato Rodriguez. "Synthesis and characterization of titania/graphene nanocomposite for application in photocatalysis." Revista Mexicana de Física 66, no. 5 Sept-Oct (2020): 610. http://dx.doi.org/10.31349/revmexfis.66.610.

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Titanium dioxide has been extensively investigated as a photocatalyst for water purification, presenting limitations such as recombination of electron-hole pairs generated by photons. The titania / graphene nanocomposites are promising materials to overcome these limitations due to the high specific area of graphene and unique electronic properties. In this work, an anatase-graphene nanocomposite was synthesized by a simple mixture assisted by ultrasound. Graphene was obtained by electrochemical exfoliation of graphite using the electrolysis technique. On the other hand, anatase was synthesize

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9

Zsebök, Otto, Jan V. Thordson, Qingxiang Zhao, Ulf Södervall, Lars Ilver, and Thorvald G. Andersson. "The Effect of Al in Plasma-assisted MBE-grown GaN." MRS Internet Journal of Nitride Semiconductor Research 5, S1 (2000): 209–15. http://dx.doi.org/10.1557/s1092578300004294.

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We have grown GaN, with addition of a 0.10 to 0.33 % Al, on sapphire(0001) substrates by solid-source RF-plasma assisted MBE. The Al-concentration was determined by secondary ion-mass spectrometry and Auger-electron spectroscopy, while the layer quality was assessed by photoluminescence and high-resolution scanning electron microscopy. Microscopy revealed a meandering pattern and a surface roughness varying with Al-content. The smallest surface roughness was obtained at 0.10 % Al. Photoluminescence revealed two main peaks attributed to the neutral donor-bound exciton. Its energy increased slig

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10

Fan, Yunan, and Fugang Qi. "Effect of rapid cold stamping on the precipitation and mechanical properties of Al–Cu–Mg alloy." Materials Express 12, no. 2 (2022): 355–61. http://dx.doi.org/10.1166/mex.2022.2142.

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High-angle annular dark-field scanning transmission electron microscopy, scanning electron microscopy, and tensile tests were used to investigate the effects of rapid cold stamping deformation on the precipitation and mechanical properties of spray-formed fine-grained Al–Cu–Mg alloy during aging. The number of longplate S′ phases in peak-aged samples evidently increases with increasing number of rapid cold stamping passes. After two passes of rapid cold stamping, the distribution of long-plate S′ phases in the samples is evidently uneven, with high density in some areas and low density in some

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11

Osaka, J., N. Inque, Y. Mada, K. Yamada, and K. Wada. "In-situ observation of roughening process of MBE GaAs surface by scanning reflection electron microscopy." Journal of Crystal Growth 99, no. 1-4 (1990): 120–23. http://dx.doi.org/10.1016/0022-0248(90)90496-8.

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Ling, Zicheng, Weiping Chen, Weiye Xu, Xianman Zhang, Tiwen Lu, and Jian Liu. "The Influence of A Mo Addition on the Interfacial Morphologies and Corrosion Resistances of Novel Fe-Cr-B Alloys Immersed in Molten Aluminum." Materials 12, no. 2 (2019): 256. http://dx.doi.org/10.3390/ma12020256.

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The influence of a Mo addition on the interfacial morphologies and corrosion resistances of novel Fe-Cr-B alloys in molten aluminum at 750 °C was systematically investigated using scanning electron microscopy, X-ray diffractometer, electron probe microanalysis, and transmission electron microscopy. The results indicated that Mo could not only strengthen the matrix but also facilitate the formation of borides. Furthermore, the microstructures of Mo-rich M2B boride changed from a local eutectic net-like structure to a typical coarse dendritic structure and a blocky hypereutectic structure with i

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13

Lazo, A., C. Paucarchuco, and H. Loro. "SÍNTESIS DE YAIO3 (YAP) POLICRISTALINO POR EL MÉTODO DE COMBUSTIÓN EN SOLUCIÓN." Revista Cientifica TECNIA 27, no. 1 (2018): 61. http://dx.doi.org/10.21754/tecnia.v27i1.126.

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Se presenta el método de combustión en solución y su aplicación para la síntesis de YAlO3 (YAP), fueron usados como combustibles para la reacción de combustión y síntesis la urea y glicina, del YAP. Usando las técnicas de difracción de rayos X (XRD) por el método del polvo y microscopia electrónica de barrido (MEB) fueron analizadas la parte estructural y morfológica de las muestras obtenidas. Los difractogramas de Rayos X muestran una excelente correspondencia con lo reportado en la literatura para este material. Se suministran también los resultados de las muestras de material YAlxCrx‐1O3, d

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14

Bayon, Nicole Nazario, Nithin Krisshna Gunasekaran, Prathima Prabhu Tumkur, et al. "Synthesis and characterization of titanium nitride nanoparticles." Materials Express 12, no. 9 (2022): 1211–15. http://dx.doi.org/10.1166/mex.2022.2241.

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Titanium nitride (TiN) materials have gained an interest over the past years due to their unique characteristics, such as thermal stability, extreme hardness, low production cost, and comparable optical properties to gold. In the present study, TiN nanoparticles were synthesized via a thermal benzene route to obtain black nanoparticles. Scanning electron microscopy (SEM) was carried out to examine the morphology. Further microscopic characterization was done where the final product was drop cast onto double-sided conductive carbon tape and sputter-coated with gold/palladium at a thickness of 4

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15

Weng, Shuo, Hongchang Cai, Lihui Zhao, and Songlin Zheng. "Microstructural change and corrosion variation of SAPH440 steel induced by pre-deformation." Materials Express 9, no. 6 (2019): 610–15. http://dx.doi.org/10.1166/mex.2019.1546.

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The influence of microstructural variation on corrosion of SAPH440 steel induced by pre-deformation has been investigated in the corrosive solution. The microstructure observation was carried out by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The corrosion was characterized by weight loss method (WLM), open circuit potential (OCP) and potentiodynamic polarization curve (PPC) measurements. The results show that compared to the as-received specimens, the corrosion potential moves to the negative direction and corrosion current density increases after pre-deform

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Yang, Zhiguang, Chaosheng Zhu, Zhiqiang Hou, and Peng Peng. "Effect of oxygen vacancies on the surface morphology and structural properties of WO3– x nanoparticles." Materials Express 9, no. 7 (2019): 773–77. http://dx.doi.org/10.1166/mex.2019.1567.

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WO3 is an essential material for energy storage and catalytical technology, the oxygen vacancies level will play an essential role in its potential application. In this paper, porous tungsten oxide (WO3–x) with various oxygen contents was quickly fabricated by a microwave plasma-enhanced chemical vapor deposition method. A detailed characterization of structure and morphology features with the plasma handling process was recorded by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy, respectively. The etching mechanism of porous WO3–x under H2 p

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17

Fan, Caihe, Liuxin Ding, Yumeng Ni, Jiangxiong Gao, Jianjun Yang, and Guixiang Long. "Effect of different precoating cleaning processes on the corrosion resistance of WC-Co hard alloy matrix." Materials Express 13, no. 9 (2023): 1570–81. http://dx.doi.org/10.1166/mex.2023.2488.

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Taking a WC-Co cemented carbide substrate as the research object, this study analyzes the roles of pH value and temperature in the corrosion action of the alloy substrate by electrochemical test. The surface morphology of the samples before and after retest was observed by scanning electron microscope. Comparative research on the corrosion behavior of different pH values at room temperature demonstrates that the alloy matrix has the best self-corrosion potential when the solution pH is 11, and the charge transfer resistance Rct is an order of magnitude higher than that in other pH solutions. T

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Zhang, Yu, Ruijian Song, and Xiang Zhang. "Preparation of electrochemically deposited nickel—cobalt nanocomposite coating and research on its corrosion resistance." Materials Express 11, no. 12 (2021): 2039–46. http://dx.doi.org/10.1166/mex.2021.2110.

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Alloying as a way of improving material properties has really gained a lot of global attention over the past few years. Alloying majorly improves physicochemical, electrochemical, thermal, and mechanical and corrosion resistance of a parent material. In this work, electrodeposition using a sulphamate electrolytic cell under varied concentrations of the secondary phase of cobalt. Characterization of the alloy was achieved using scanning electron microscopy (SEM), optical microscopy (OM), and X-ray diffraction (XRD) techniques. Corrosion resistance was investigated using potentiometric and imped

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19

Higashino, T., J. Osaka, K. Tanahashi, et al. "The measurement of work function on GaAs (001) surface during MBE growth by scanning electron microscopy." Journal of Crystal Growth 209, no. 2-3 (2000): 431–34. http://dx.doi.org/10.1016/s0022-0248(99)00585-0.

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20

Maiti, Paramita, Arijit Mitra, R. R. Juluri, Ashutosh Rath, and Parlapalli V. Satyam. "Growth of Molybdenum Trioxide Nanoribbons on Oriented Ag and Au Nanostructures: A Scanning Electron Microscopy (SEM) Study." Microscopy and Microanalysis 25, no. 6 (2019): 1449–56. http://dx.doi.org/10.1017/s1431927619014648.

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AbstractWe report the growth of molybdenum trioxide (MoO3) nanoribbons (NRs) on epitaxial Ag and oriented Au nanostructures (NSs) using an ultra-high vacuum (UHV)-molecular beam epitaxy (MBE) technique at different substrate temperatures. An approximately 2 nm silver (Ag) film has been deposited at different growth temperatures (using UHV-MBE) on cleaned Si(100), Si(110), and Si(111) substrates. For faceted Au NSs, an approximately 50 nm Au film has been deposited (using high-vacuum thermal evaporation) on a Si(100) substrate with a native oxide layer at the interface and the sample was anneal

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21

Abud, Saleh H., Hassan Zainuriah, Fong Kwong Yam, and Alaa J. Ghazai. "Structural and Optical Properties of In_0.27Ga_0.73N/Si (111) Film Grown Using PA-MBE Technique." Advanced Materials Research 620 (December 2012): 368–72. http://dx.doi.org/10.4028/www.scientific.net/amr.620.368.

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In this paper, InGaN/GaN/AlN/Si (111) structure was grown using a plasma-assisted molecular beam epitaxy (PA-MBE) technique. The structural and optical properties of grown film have been characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), high resolution X-ray diffraction (HR-XRD) and photoluminescence (PL). Indium-mole fraction has been computed to be 0.27 using XRD data and Vegards law with high grain size and low tensile strain. Room-temperature photoluminescence revealed an intense peak at 534 nm (2.3 eV) related to our sample In0.27Ga0.73N.

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Khalili, Parastoo, and Majid Farahmandjou. "Morphology and structure study of polygon ZnO nanorods: Biomedical applications." Materials Engineering Research 3, no. 1 (2021): 125–32. http://dx.doi.org/10.25082/mer.2021.01.001.

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In this study, zinc oxide (ZnO) nanoparticles (NPs) were first synthesized using co-precipitation method in the presence of Zn(NO3)2.6H2O precursor and calcined at different temperature of 450 oC and 1000 oC. Samples were then characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The XRD study revealed the hexagonal wurtzite structure for annealed samples. SEM images showed tthat he morphology of the ZnO NPs changed from sphere-like shape to polygon shape by increasing temperature. The exac

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Cullen, David A., Haoran Yu, Michael J. Zachman, et al. "Recreating Fuel Cell Catalyst Degradation in Aqueous Environments for Identical-Location Scanning Transmission Electron Microscopy Studies." ECS Meeting Abstracts MA2022-01, no. 35 (2022): 1452. http://dx.doi.org/10.1149/ma2022-01351452mtgabs.

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Proton exchange membrane fuel cells (PEMFCs) have long been studied for applications in sustainable transportation. The recent shift in focus from passenger vehicle to heavy duty applications places increased demand on the efficiency and durability of the components used in membrane electrode assemblies (MEAs).[1] Of particular interest are the oxygen reduction reaction electrocatalysts used in the fuel cell cathode. While the relaxed capital cost requirements for heavy duty applications allows for increased precious metal loadings, the four-fold increase in operating lifetime requires improve

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Khalili, Parastoo, та Majid Farahmandjou. "Study of α-Fe2O3@ ZnO nanoleaves: Morphological and optical study". Materials Engineering Research 2, № 1 (2020): 118–24. http://dx.doi.org/10.25082/mer.2020.01.004.

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In this paper, α-Fe2O4@ZnO nanoparticles (NPs) were synthesized by coprecipitation method in the presence of PVP and EG surfactants. The samples were charactrized by x-ray fluorescence (XRF), x-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and fourier transform infrared spectroscopy (FTIR). The XRD results exhibited rhombohedral α-Fe2O3 and wurtzite structure of ZnO. The SEM images showed that the NPs changed from rod-shape to nanoleaves particles after heat treatment. The TEM studies displayed the formation of Fe2O3@ZnO co

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KAZAKOV, I. P., V. I. KOZLOVSKY, V. P. MARTOVITSKY, et al. "MBE GROWN ZnSSe/ZnMgSSe MQW STRUCTURE FOR BLUE VCSEL." International Journal of Nanoscience 06, no. 05 (2007): 407–10. http://dx.doi.org/10.1142/s0219581x07004493.

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ZnSSe / ZnMgSSe MQW structures were grown by molecular beam epitaxy on GaAs substrates. The band gap of ZnMgSSe barriers was approximately 3 eV at room temperature. Cathodoluminescence, X-ray diffraction, optical, scanning electron beam, and atomic force microscopy were all used for structure characterization. Decay of the ZnMgSSe solid solution in at least two phases was observed. Improvement in the quality of the crystal lattice and surface morphology was achieved by mismatching the ZnMgSSe from the GaAs substrate by increasing the lattice period by 0.24%.

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XIE, M. H., S. H. CHEUNG, L. X. ZHENG, S. Y. TONG, B. S. ZHANG, and H. YANG. "GROWTH AND STRUCTURAL PROPERTIES OF GaN FILMS ON FLAT AND VICINAL SiC(0001) SUBSTRATES." International Journal of Modern Physics B 16, no. 01n02 (2002): 165–72. http://dx.doi.org/10.1142/s0217979202009603.

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Initial stage GaN growth by molecular-beam (MBE) on SiC (0001) substrate is followed by in situ scanning tunneling microscopy. Comparison is made between growth on nominally flat and vicinal substrate surfaces and the results reveal characteristic differences between the two. Ex situ transmission electron microscopy (TEM) and X-ray diffraction (XRD) rocking curve measurements of the films show lower density of defects and better structural quality of the vicinal film. We suggest the improved structural quality of the vicinal film is related to the characteristic difference in its initial stage

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27

Perovic, D. D., and J. H. Paterson. "High-angle annular dark-field STEM imaging of doped semiconductor layers." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 704–5. http://dx.doi.org/10.1017/s0424820100087835.

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With the development of crystal growth techniques such as molecular beam epitaxy (MBE), it is now possible to fabricate modulation-doped superlattices consisting of alternating ultrathin layers of n-and/or p-type material abruptly separated by undoped material. At sufficiently high dopant concentrations these abrupt layers may be imaged in cross section by electron microscopy. Pennycook et al. and Treacy et al. have used high angle annular dark-field (HAAD) imaging in the scanning transmission electron microscope (STEM) to image low levels of dopants (∼1 at. %) in semiconductors. This work is

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DVURECHENSKII, A. V., J. V. SMAGINA, V. A. ZINOVYEV, S. A. TEYS, A. K. GUTAKOVSKII, and R. GROETZSCHEL. "MODIFICATION OF GROWTH MODE OF Ge ON Si BY PULSED LOW-ENERGY ION-BEAM IRRADIATION." International Journal of Nanoscience 03, no. 01n02 (2004): 19–27. http://dx.doi.org/10.1142/s0219581x04001778.

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Scanning tunneling microscopy (STM) and reflection high-energy electron diffraction (RHEED) experiments were performed to study growth modes induced by hyperthermal Ge + ion action during molecular beam epitaxy (MBE) of Ge on Si (100). The continuous and pulsed ion beams were used. These studies have shown that ion-beam bombardment during heteroepitaxy leads to decrease in critical film thickness for transition from two-dimensional (2D) to three-dimensional (3D) growth modes, enhancement of 3D island density and narrowing of island size distribution, as compared with conventional MBE experimen

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Łapiński, Marcin, Piotr Dróżdż, Mariusz Gołębiowski, et al. "Thermal Instability of Gold Thin Films." Coatings 13, no. 8 (2023): 1306. http://dx.doi.org/10.3390/coatings13081306.

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The disintegration of a continuous metallic thin film leads to the formation of isolated islands, which can be used for the preparation of plasmonic structures. The transformation mechanism is driven by a thermally accelerated diffusion that leads to the minimalization of surface free energy in the system. In this paper, we report the results of our study on the disintegration of gold thin film and the formation of nanoislands on silicon substrates, both pure and with native silicon dioxide film. To study the processes leading to the formation of gold nanostructures and to investigate the effe

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Nadzirah, Sharipah, and Uda Hashim. "Synthesis and Film Investigation of Titania." Advanced Materials Research 832 (November 2013): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amr.832.128.

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Titania or titanium dioxide (TiO2) thin film has been synthesized via sol-gel method with monoethanolamine (MEA) as a catalyst. The mixing of titanium butoxide as a precursor, ethanol as a solvent and MEA were stirred using magnetic stirrer under ambient temperature [. The TiO2solution prepared then was deposited on SiO2substrates using spin-coater and the coated films were annealed at 600°C. Finally, both before and after annealed TiO2thin films were characterized using Field Emission Scanning Electron Microscopy (FESEM). The obtained results show the different TiO2particles formation before

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Chen, Zixuan, Xudong Li, Jie Xie, Jianzhong Pei, Chengchao Wang, and Rui Li. "Preparation and performance characteristics of reduced graphene oxide modified asphalt." Materials Express 11, no. 9 (2021): 1579–86. http://dx.doi.org/10.1166/mex.2021.2046.

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Reduced graphene oxide (RGO) was self-prepared by the oxidation reduction method and then characterized by several tests known as Fourier Transform Infrared Spectroscopy (FTIR) test, scanning electron microscopy (SEM) test, transmission electron microscopy (TEM) test, elemental analysis, raman measurement and thermogravimetry (TG) analysis to evaluate the properties of RGO. Additionally, RGO modified asphalt was prepared in this research to study the influence of RGO on matrix asphalt. Some of the normal performances of RGO modified asphalt were studied in terms of penetration at medium temper

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Inoue, N., Y. Homma, J. Osaka, and T. Araki. "Behavior of monolayer holes on MBE grown GaAs surfaces during annealing revealed by in situ scanning electron microscopy." Journal of Crystal Growth 164, no. 1-4 (1996): 88–91. http://dx.doi.org/10.1016/0022-0248(95)01064-5.

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Hu, H., M. Zheng, J. N. Eckstein, and J. Zuo. "Scanning Transmission Electron Microscopy Evidences Of Interstitial And Substitutional Oxygen In MBE Grown Fe1+xTe Thin Films And Emergence Of Superconductivity." Microscopy and Microanalysis 18, S2 (2012): 1456–57. http://dx.doi.org/10.1017/s1431927612009130.

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Xie, M. H., S. M. Seutter, L. X. Zheng, et al. "Surface Morphology of GaN: Flat versus Vicinal Surfaces." MRS Internet Journal of Nitride Semiconductor Research 5, S1 (2000): 174–80. http://dx.doi.org/10.1557/s1092578300004245.

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The surface morphology of GaN films grown by molecular beam epitaxy (MBE) is investigated by scanning tunneling microscopy (STM). A comparison is made between flat and vicinal surfaces. The wurtzite structure of GaN leads to special morphological features such as step pairing and triangularly shaped islands. Spiral mounds due to growth at screw threading dislocations are dominant on flat surfaces, whereas for vicinal GaN, the surfaces show no spiral mound but evenly spaced steps. This observation suggests an effective suppression of screw threading dislocations in the vicinal films. This findi

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35

Coats, Matthew, Samantha Medina, Jonathan Braaton, et al. "Quantitative Analysis of Fuel Cell Cathode Catalyst Layer Degradation Using Scanning Transmission Electron Microscopy and Energy Dispersive Spectroscopy." ECS Meeting Abstracts MA2022-02, no. 39 (2022): 1434. http://dx.doi.org/10.1149/ma2022-02391434mtgabs.

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Proton exchange membrane fuel cells (PEMFCs) are a central technology for the electrification of the heavy-duty automotive fleet, ultimately enabling reduced carbon emissions. However, improvements in lifetime and cost are necessary before mass adoption of PEMFC vehicles is achieved. Significant research into analyzing and mitigating degradation of catalyst layers (CLs) is ongoing and this work highlights a transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) approach aimed at quantifying electrochemically active surface area (ECSA) loss through the thickness of CLs

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Xiao, H. Z., R. Tsu, I. M. Robertson, H. K. Birnbaum, and J. E. Greene. "Growth of Si on Ge(001)2×l by gas-source molecular beam epitaxy." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 806–7. http://dx.doi.org/10.1017/s0424820100149866.

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The growth of SiGe strained-layer superlattices (SLS) has been received considerable attention due to the electronic and optoelectronic properties of these layers. In addition, these structures offer tantalizing possibilities for "band gap engineering" through the use of strain and chemically ordered alloys. The remaining barriers to grow the SiGe SLS structures with high quality result from the generation of large densities of defects, such as dislocations, twins, stacking faults, etc., at the heterointerfaces arising from the misfit strain relaxation. Other problems associated with the growt

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Christoffersen, R., S. Kim, Y. L. Yang, and A. J. Jacobson. "Analytical TEM and EPMA Study of Decomposition Reactions in an Oxygen-Separation Membrane Material." Microscopy and Microanalysis 3, S2 (1997): 745–46. http://dx.doi.org/10.1017/s1431927600010618.

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Mixed-conducting oxides with appropriate values of electronic and ionic conductivity have the potential to be used as ceramic “membranes” for the separation of oxygen from other gases. The separation is based on oxygen transport from an O2-rich, and hence oxidizing, gas reservoir on one side of the membrane to an O2-lean, and hence reducing, take-up reservoir on the membrane's other side. The oxide Sr(Co1-xFex)O3-δ (SCFO), which has a cubic perovskite structure, is one such potential membrane material. Although the permeation flux of oxygen through SCFO membranes has been mea-sured, the micros

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Lian, Brenda Lim Ai, Steven Lim, Pang Ling Yean, Siew Hoong Shuit, and Huei Wong Kam. "Biomass Wastes as Precursor For The Synthesis of Carbon Nanoparticle." IOP Conference Series: Earth and Environmental Science 945, no. 1 (2021): 012035. http://dx.doi.org/10.1088/1755-1315/945/1/012035.

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Abstract The development of technology and the growth in human population had resulted in a surge in energy demand and biomass waste production. Metal-air battery (MAB) is a potential energy storage technology with high theoretical energy density and safety. However, the conventional air cathode material synthesized from carbon nanotube (CNT) is rather costly. In this study, several biomass wastes such as oil palm empty fruit bunch (OPEFB), garlic peel (GP) and oil palm frond (OPF) were investigated to identify a suitable greener and efficient precursor to syntheelesize carbon nanoparticle as

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He, Xiaoqing, Lin Gu, Changbao Zhu, et al. "Direct Imaging of Lithium Ions Using Aberration-Corrected Annular-Bright-Field Scanning Transmission Electron Microscopy and Associated Contrast Mechanisms." Materials Express 1, no. 1 (2011): 43–50. http://dx.doi.org/10.1166/mex.2011.1006.

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Bourqui, B., P. A. Buffat, J. D. Ganière, and F. K. Reinhart. "Characterization of zinc diffusion induced disordering in GaAs/AlGaAs multiquantum well structures by Transmission Electron Microscopy." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 734–35. http://dx.doi.org/10.1017/s0424820100176800.

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Diffusion of impurities, such as zinc or silicon, enhances the intermixing of Ga-Al atoms at GaAs/AlGaAs interfaces. This process is useful to modify the bandedge properties of multilayered structures such as (AlxGa1-xAs/GaAs). Important technological applications are due to this effect. Information about electronic states of the disordered structure is directly obtained by photoluminescence. The impurity induced disordering depth is, usually, estimated either by scanning electron microscopy (SEM) or by secondary ion mass spectroscopy (SIMS). We used transmission electron microscopy on wedge s

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Tamizhanban, S., and D. Jegatheeswaran. "Multiscale analysis, mechanical properties and strength of hydrophobic paper sludge." Materials Express 12, no. 9 (2022): 1231–40. http://dx.doi.org/10.1166/mex.2022.2267.

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In order to combat the damaging environmental effects of cement production and the depletion of natural resources, a sustainable concrete company must develop alternative binders. This study investigates the use of hydrophobic paper sludge ash as a partial cement substitute in new concrete. The primary chemical components of the hydrophobic paper sludge ash were determined using energy dispersive X-ray microanalysis and Fourier transforms infrared. Differential scanning calorimetry and thermogravimetry are used to analyse the hydration and pozzolanic reaction in concrete in relation to the amo

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Wang, Guofeng, Minghui Liu, Lizhong Wang, and Hongbo Liu. "Preparation and study of Fe–Co–Zr–B nano-soft magnetic alloy." Materials Express 9, no. 6 (2019): 686–89. http://dx.doi.org/10.1166/mex.2019.1541.

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The mechanical alloying of Fe–Co–Zr–B mixed powder has been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and other test methods. The results show that the Fe–Co–Zr–B nanocrystalline alloy can be produced by mechanical alloying from the elements powders by ball milling of 50 h. With the increase in Co content, the grain size increases correspondingly, and the size of composite particles decreases continuously. The mechanical alloying process of Fe–Co–Zr–B alloy system is slowed down by the addition of Co.

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Dixon, R. H., P. Kidd, and P. J. Goodhew. "Defect morphology in thick relaxed layers of InGaAs on GaAs." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 668–69. http://dx.doi.org/10.1017/s0424820100176472.

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Thick relaxed InGaAs layers grown epitaxially on GaAs are potentially useful substrates for growing high indium percentage strained layers. It is important that these relaxed layers are defect free and have a good surface morphology for the subsequent growth of device structures.3μm relaxed layers of InxGa1-xAs were grown on semi - insulating GaAs substrates by Molecular Beam Epitaxy (MBE), where the indium composition ranged from x=0.1 to 1.0. The interface, bulk and surface of the layers have been examined in planar view and cross-section by Transmission Electron Microscopy (TEM). The surfac

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CHEN, XIAODONG, WILLIAM J. SCHAFF, and LESTER F. EASTMAN. "FOCUSED THERMAL BEAM DIRECT PATTERNING ON INGAN DURING MOLECULAR BEAM EPITAXY." International Journal of High Speed Electronics and Systems 17, no. 01 (2007): 97–101. http://dx.doi.org/10.1142/s0129156407004291.

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During InGaN Molecular Beam Epitaxy (MBE) growth, the material surface is exposed to a small diameter pulse laser beam that is controlled by scanning mirrors. Local heating effects are observed at the points of exposure. The materials are characterized by Wavelength Dispersive Spectroscopy (WDS), Scanning Electron Microscopy (SEM), and Photoluminescence (PL). Indium mole fraction of materials is reduced where laser exposure takes place. The effect of local thermal heating appears to enhance surface diffusion while not causing ablation or evaporation under the conditions studied. PL efficiency

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Gas, Katarzyna, Slawomir Kret, Wojciech Zaleszczyk, et al. "Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties." Materials 14, no. 18 (2021): 5252. http://dx.doi.org/10.3390/ma14185252.

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Results of comparative structural characterization of bare and Zn-covered ZnTe nanowires (NWs) before and after thermal oxidation at 300 °C are presented. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, and Raman scattering not only unambiguously confirm the conversion of the outer layer of the NWs into ZnO, but also demonstrate the influence of the oxidation process on the structure of the inner part of the NWs. Our study shows that the morphology of the resulting ZnO can be improved by the deposition of thin Zn shells on t

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Zhao, Xiaoguang, Jing Ouyang, Qi Tan, Xiumin Tan, and Huaming Yang. "Interfacial characteristics between mineral fillers and phenolic resin in friction materials." Materials Express 10, no. 1 (2020): 70–80. http://dx.doi.org/10.1166/mex.2020.1596.

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Mineral fillers are indispensable constituent part of friction materials, which are capable of improving and stabilizing coefficient of friction, decreasing wear, enhancing thermal conductivity and reducing costs of friction materials, in addition, decreasing the noise in brake application. Based on their roles in the friction materials, mineral fillers are classified into abrasives, lubricants, functional fillers, and space fillers. Herein, four typical commercial mineral fillers, namely quartz, graphite, expanded vermiculite, and barite were studied for revealing their effects on the perform

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Zhao, Feng-Wei, Qian Zhang, Feng Hui, et al. "Catalytic Behavior of Alkali Treated H-MOR in Selective Synthesis of Ethylenediamine via Condensation Amination of Monoethanolamine." Catalysts 10, no. 4 (2020): 386. http://dx.doi.org/10.3390/catal10040386.

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Catalytic behavior of alkali treated mordenite (H-MOR) in selective synthesis of ethylenediamine (EDA) via condensation amination of monoethanolamine (MEA) was investigated. Changes in the structural and acidic properties of alkali treated H-MOR were systematically investigated by N2 adsorption/desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), temperature programmed ammonia desorption (NH3-TPD), pyridine adsorption was followed by infrared spectroscopy (Py-IR), and X-ray fluorescence (XRF) analyses. The results show that

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Ji, Xiaoying, Xin Huang, Fengcheng Shi, et al. "Enhancing the water vapor barrier of eco-friendly, emulsion-coated paper via a bilayer-like structure design." Materials Express 12, no. 5 (2022): 726–34. http://dx.doi.org/10.1166/mex.2022.2180.

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To further improve the water vapor barrier of paper packaging materials, eco-friendly, polyvinyl alcohol (PVA)/glycerol tristearate (GTS) emulsions were prepared as surface coatings. The hydrophilic hydroxyl groups within the PVA chains were consumed through a crosslinking reaction to improve water resistance. Introducing the hydrophobic GTS phase into the crosslinked matrix led to the formation of a bilayer-like structure, which could be tuned by changing the GTS content and the drying temperature. The microstructural evolution was revealed via scanning electron microscopy (SEM) and atomic fo

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Guy, Owen J., Amador Pérez-Tomás, Michael R. Jennings, et al. "Investigation of Si/4H-SiC Hetero-Junction Growth and Electrical Properties." Materials Science Forum 615-617 (March 2009): 443–46. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.443.

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This paper describes the growth and characterisation of Si/SiC heterojunction structures. Heterojunction structures are of interest for low on-resistance diodes and as potential solutions to fabricating SiC MOS devices with lower interface state densities. The formation of the Si/SiC heterojunction using Chemical Vapour Deposition (CVD), Molecular Beam Epitaxy (MBE), Electron Beam Evaporation under UHV conditions (EBE-UHV) and Layer Transfer (LT) are reported. The physical nature of Si/SiC structures has been investigated using scanning electron microscopy (SEM). Results of electrical characte

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Wagner, Thomas. "High temperature epitaxial growth and structure of Nb films on α–Al2O3(0001)". Journal of Materials Research 13, № 3 (1998): 693–702. http://dx.doi.org/10.1557/jmr.1998.0087.

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Epitaxial Nb thin films were grown via molecular beam epitaxy (MBE) at different substrate temperatures on α–Al2O3(0001) substrates. For temperatures of 900 °C to 1100 °C, it was found that Nb grows in the Volmer–Weber growth mode (formation of three-dimensional crystallites). Depending on the growth temperature, different epitaxial orientations of Nb films can be found. At a growth temperature of 900 °C, the Nb{111} planes are parallel to the sapphire basal plane whereas at 1100 °C the Nb grows with the {110} planes on the basal plane of sapphire. These orientations are present even in the in

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