Article
Chemistry, Physical
Kun Zhang, Zongwei Xu, Junlei Zhao, Hong Wang, Jianmin Hao, Shengnan Zhang, Hongjuan Cheng, Bing Dong
Summary: Ion doping technology with precise control of doping concentration and configuration can optimize the performance of beta-phase gallium oxide (beta-Ga2O3) high-power electronic and optoelectronic devices. By separately doping shallow-donor Si and deep-acceptor Mg impurities in beta-Ga2O3 using the EFG method, the study found that the Si-doped sample has higher stability at different temperatures, while the local atomic configurations of Mg impurities can be more easily/significantly affected by temperature. The research provides valuable insights for the application of ion-doped beta-Ga2O3 optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Santosh K. Swain, Marc H. Weber, Jani Jesenovec, Muad Saleh, Kelvin G. Lynn, John S. McCloy
Summary: The study reveals the existence of a compensating level below the conduction band in the O2-annealed B-Ga2O3:Zr sample, possibly caused by the relaxed split Ga vacancy. The sample shows a significant increase in resistivity after annealing under oxygen atmosphere, and also exhibits unique vacancy characteristics and anisotropy in the monoclinic lattice.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Electrical & Electronic
S. G. Pavlov, Yu. A. Astrov, L. M. Portsel, V. B. Shuman, A. N. Lodygin, N. V. Abrosimov, H-W Huebers
Summary: Magnesium atoms diffuse in silicon lattice at high temperatures, forming specific bonds to host silicon atoms, other magnesium atoms, and other defects. Shallow magnesium-related donor centers are observed in silicon, with energy spectra filling two separate infrared ranges, and are related to the general phenomenon of formation of shallow donors in silicon.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Diyan Unmu Dzujah, Abdul-Muizz Pradipto, Rahmat Hidayat, Kohji Nakamura
Summary: Graphene doped with different transition metal atoms (Co, Ni, Cu, Zn, and Au) was studied using first-principles calculations. Substituting TM atoms for carbon atoms in the graphene basal plane led to the opening of a band gap and the emergence of mid-gap states. Optical properties were affected, as observed from optical absorption and EELS spectra. Plasmon wave excitation was expected at the THz region, dependent on the dopant TM atom.
Article
Physics, Applied
Andrew Venzie, Amanda Portoff, E. Celeste Perez Valenzuela, Michael Stavola, W. Beall Fowler, Stephen J. Pearton, Evan R. Glaser
Summary: This article compares and contrasts the vibrational properties of complexes that involve shallow donors and deep acceptors, and presents theoretical analysis results.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Mingwang Ma, Lei Wang, Ruiyun Wan, Binghua Tang, Xiaohua Tan
Summary: The thermal desorption behaviors of erbium trihydride (ErH3) powders were studied using simultaneous thermogravimetry and thermal desorption spectroscopy (TG-TDS) method. The crystal structures and chemical compositions of the samples were investigated by X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The phase transformation sequences and the origins of the observed peaks and shoulders were determined.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Masazumi Hayashi, Rintaro Ichihara, Nobuyuki Akai, Munetaka Nakata
Summary: The photoreactions of 2-chlorothiophenol were studied using matrix-isolation IR spectroscopy and density functional theory calculation, revealing various photoproducts and intermediate structures under different irradiation conditions.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Biochemistry & Molecular Biology
Urban Novak, Eva Zerovnik, Ajda Taler-Vercic, MagdaTusek Znidaric, Barbara Zupancic, Joze Grdadolnik
Summary: This study used Stefin B as a model protein to monitor protein aggregation and amyloid structure formation using infrared spectroscopy. The results showed that pH value significantly affects the monomer stability of Stefin B, with lower stability in acidic environment and higher stability in neutral or alkaline conditions. The proposed infrared data model provides insights into the aggregation process of Stefin B.
FRONTIERS IN BIOSCIENCE-LANDMARK
(2023)
Article
Chemistry, Physical
Fumitoshi Kaneko, Chihiro Katagiri, Ken Nagashima, Gen Sazaki, Yuka Ikemoto
Summary: Cuticular lipids on insect body surfaces play crucial roles in protection, water control, reduction of abrasion, prevention of pathogen intrusion, and communication between insects. Utilizing Fourier transform infrared spectroscopy, it was found that the cuticular lipids exhibit significant heterogeneity and complex structures on insect body surfaces.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Agata Kowalska, Konrad Czerski, Pawel Horodek, Krzysztof Siemek, Mateusz Kaczmarski, Natalia Targosz-Sleczka, Mathieu Valat, Rakesh Dubey, Krzysztof Pyszniak, Marcin Turek, Andrzej Drozdziel, Justyna Slowik, Jolanta Baranowska
Summary: Low-energy nuclear reactions are strongly influenced by the crystal structure and defects of deuterated samples. In this study, zirconium samples were exposed to deuteron beams and investigated using X-ray diffraction and positron annihilation spectroscopy. The observed enhancement of the electron-screening effect at very low energies can be explained by the formation of vacancies during deuteron irradiation.
Article
Nanoscience & Nanotechnology
Andrea E. A. Bracesco, Jarvi W. P. Jansen, Haibo Xue, Valerio Zardetto, Geert Brocks, Wilhelmus M. M. Kessels, Shuxia Tao, Mariadriana Creatore
Summary: By optimizing the optoelectronic properties of the absorber and its interfaces with charge transport layers (CTLs), perovskite photovoltaics has achieved conversion efficiencies of 26.0%. However, commonly adopted organic CTLs can cause parasitic absorption and device instability, so metal oxides like atomic layer-deposited SnO2 have been introduced for enhanced stability. When ALD SnO2 is directly processed on the absorber without the fullerene layer, chemical modifications of the inorganic fraction of the perovskite occur, compromising the device performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Xueying Kang, Haojie Huang, Chenyang Jiang, Longhuai Cheng, Yueqian Sang, Xuekang Cai, Yalun Dong, Lu Sun, Xin Wen, Zhen Xi, Long Yi
Summary: The importance of selenium in biology and health is becoming increasingly clear. This study demonstrates that selenocyclopropenones and selenoamides can release hydrogen selenide (H2Se) upon reaction with cysteine, and the rate of release can be tuned through structural modifications. The researchers developed a quantitative assay for direct H2Se trapping and quantification. Additionally, they found that arylselenoamide can release H2Se in cellular environments. Mechanistic investigations and density functional theory calculations provide insight into the possible pathways of Cys-activated H2Se release. The well-defined chemistries of Cys-activated H2Se donor motifs have potential for studying selenium biology and developing new H2Se donors and bioconjugate techniques.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Julia Alvarez-Malmagro, Manuela Rueda, Francisco Prieto-Dapena
Summary: The adsorption of guanine on gold electrodes was studied using cyclic voltammetry and ATR-SEIRA spectroscopy. The results showed that the adsorption process depends on the pH value, and different tautomeric forms of guanine were observed in solution and in the adsorbed state. The orientation of the adsorbed guanine molecules and the preponderance of different tautomeric forms were also influenced by the electric field.
ELECTROCHIMICA ACTA
(2023)
Article
Physics, Applied
Huayang Huang, Xiaolan Yan, Xuelin Yang, Wensheng Yan, Zeming Qi, Shan Wu, Zhaohua Shen, Ning Tang, Fujun Xu, Xinqiang Wang, Weikun Ge, Bing Huang, Bo Shen
Summary: By combining experimental observations and first-principles simulations, it was found that in p-type GaN, the C impurity mainly occupies the N site rather than the Ga site, and this phenomenon is attributed to an H-induced E-F tuning effect. This work not only provides clear evidence for C defect formation in p-GaN, but also significantly contributes to understanding the role of C-related hole-killers in the electrical and optoelectrical properties of p-GaN and even p-AlGaN.
APPLIED PHYSICS LETTERS
(2022)
Article
Spectroscopy
Changlin Su, Li Han, Hongle An, Wensheng Cai, Xueguang Shao
Summary: Investigating the structures of water on metal oxides is helpful for understanding the mechanism of the ad-sorptions in the presence of water. Diffuse reflectance near-infrared spectroscopy (DR-NIRS) was used to study the structures of adsorbed water molecules on anatase TiO2 (101). The study found that the spectral features of adsorbed water can be observed at different sites on the TiO2 surface, and there is a clear correlation between the intensity of the adsorbed water peaks and the adsorbed quantity of ATP.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Yuntao Wu, Lynn A. Boatner, Adam C. Lindsey, Mariya Zhuravleva, Steven Jones, John D. Auxier, Howard L. Hall, Charles L. Melcher
CRYSTAL GROWTH & DESIGN
(2015)
Article
Physics, Applied
Philip Weiser, Ying Qin, Weikai Yin, Michael Stavola, W. Beall Fowler, Lynn A. Boatner
APPLIED PHYSICS LETTERS
(2016)
Article
Chemistry, Physical
J. Matt Farmer, L. A. Boatner, Bryan C. Chakoumakos, Claudia J. Rawn, Jim Richardson
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Engineering, Electrical & Electronic
Pooneh Saadatkia, G. Ariyawansa, K. D. Leedy, D. C. Look, L. A. Boatner, F. A. Selim
JOURNAL OF ELECTRONIC MATERIALS
(2016)
Article
Nanoscience & Nanotechnology
Taylor M. Wilkinson, Matthew A. Musselman, Lynn A. Boatner, David R. Diercks, Corinne E. Packard
Article
Chemistry, Physical
L. A. Boatner, J. A. Kolopus, Nicolay V. Lavrik, P. Sudharshan Phani
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Electrochemistry
A. K. Kercher, J. A. Kolopus, R. L. Sacci, R. E. Ruther, N. C. Gallego, S. L. Stooksbury, L. A. Boatner, N. J. Dudney
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2017)
Article
Instruments & Instrumentation
L. A. Boatner, E. P. Comer, G. W. Wright, J. O. Ramey, R. A. Riedel, G. E. Jellison, J. A. Kolopus
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2017)
Article
Physics, Applied
Ying Qin, Philip Weiser, Karla Villalta, Michael Stavola, W. Beall Fowler, Ivan Biaggio, Lynn Boatner
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Multidisciplinary Sciences
Martin Setvin, Michele Reticcioli, Flora Poelzleitner, Jan Hulva, Michael Schmid, Lynn A. Boatner, Cesare Franchini, Ulrike Diebold
Article
Chemistry, Physical
Feifei Zhang, Lynn Boatner, Yanwen Zhang, Di Chen, Yongqiang Wang, Lumin Wang
Article
Materials Science, Multidisciplinary
Gerald E. Jellison, Raphael P. Hermann, Elliot D. Specht, Lynn A. Boatner, T. Zac Ward, Andreas Herklotz
Summary: Various bulk and thin-film crystals of SnO2 were grown and examined using generalized ellipsometry techniques, revealing distinct characteristics and behaviors of the different materials.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Margareta Wagner, Jakub Planer, Bettina S. J. Heller, Jens Langer, Andreas Limbeck, Lynn A. Boatner, Hans-Peter Steinruck, Josef Redinger, Florian Maier, Florian Mittendorfer, Michael Schmid, Ulrike Diebold
Summary: Vanadium dioxide undergoes a metal-insulator transition near room temperature, showing promise for various applications. A study of its surface properties revealed a stable oxygen-rich superstructure upon annealing over 600 degrees Celsius, providing insights into its surface reconstruction mechanisms.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Multidisciplinary Sciences
Zhichang Wang, Michele Reticcioli, Zdenek Jakub, Igor Sokolovic, Matthias Meier, Lynn A. Boatner, Michael Schmid, Gareth S. Parkinson, Ulrike Diebold, Cesare Franchini, Martin Setvin
Summary: Polarizable materials, such as the incipient ferroelectric perovskite KTaO3, exhibit the ability to tune chemical reactivity. The adsorption states of molecules are influenced by the coupling between surface polarity and ferroelectric polarization.
Article
Physics, Applied
L. A. Boatner, C. B. Finch, W. E. Brundage, J. A. Kolopus, G. R. Gruzalski, K. E. Johanns, P. Sudharshan Phani, G. M. Pharr, W. C. Oliver
Summary: Instrumented indentation experiments at elevated temperatures require careful attention to experimental details, including the choice of indenter tip material. This study used rf-induction heating float-zone and high-temperature solution single-crystal growth techniques to prepare a suite of bulk refractory carbide specimens. These materials were characterized and compared to sapphire and polycrystalline WC-Co, and the results showed that single-crystal WC is a promising candidate for elevated-temperature nanoindentation tips.
JOURNAL OF APPLIED PHYSICS
(2023)