Article
Materials Science, Multidisciplinary
Govindhasamy Murugadoss, Manavalan Rajesh Kumar, Parasuraman Kuppusami
Summary: Cu2O-Cu(OH)(2) nanocomposite was successfully synthesized via a chemical precipitation method, showing promising visible-light photocatalytic activity for crystal violet degradation. The nanocomposite combines the advantages of Cu2O and Cu(OH)(2) nanoparticles, making it a durable and efficient catalyst under visible light irradiation.
Article
Physics, Applied
Balint Fulop, Albin Marffy, Endre Tovari, Mate Kedves, Simon Zihlmann, David Indolese, Zoltan Kovacs-Krausz, Kenji Watanabe, Takashi Taniguchi, Christian Schoenenberger, Istvan Kezsmarki, Peter Makk, Szabolcs Csonka
Summary: Interlayer coupling is crucial for the properties of van der Waals heterostructures, strongly depending on the interlayer distance. By conducting transport measurements in piston-cylinder hydrostatic pressure cells, the interlayer coupling can be tuned, while a hexagonal boron nitride capping layer provides protection against pressure medium interference.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Condensed Matter
Parul Sharma, Pragati Singh, Kamni
Summary: This study systematically investigated Mn2+ doped KSrVO4 nanophosphors synthesized by low-cost combustion method, revealing their structural and spectral properties through various characterization techniques. The doping of Mn2+ was found to affect the band gap and PL spectra, indicating the potential application of these nanophosphors excited by InGaN LEDs emitting UVA light.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Bin Liang, Qishuai Zhu, Xingqi Liao, Kangwei Liu, Zhihua Yang, Dechang Jia, Yu Zhou
Summary: The oxidation behavior and kinetics of partially crystalline Si2BC3N were studied at high temperatures, revealing weight loss due to gas release and the formation of loose oxide scales. Compared to completely amorphous Si2BC3N, partially crystalline Si2BC3N exhibited inferior oxidation resistance, possibly due to changes in superficial chemical compositions and reactivity during crystallization.
Article
Nanoscience & Nanotechnology
Faheem Ahmed, P. M. Z. Hasan, Shalendra Kumar, Nagih Mohammed Shaalan, Abdullah Aljaafari, Nishat Arshi, Mohammed Albossed, Ghazzai Almutairi, Bandar Alotaibi
Summary: This work presents a low-cost, fast, and environmentally friendly method for preparing hematite iron oxide nanoparticles/reduced graphene oxide nanocomposites as electrodes for supercapacitors. The prepared nanocomposites showed high specific capacitance and excellent cyclic stability, making them promising for mass production of high-performance electrodes for energy storage devices.
SCIENCE OF ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Endale Abebe Gudeta
Summary: This study introduces a modified version of the Enzo-Parrish method to determine a straight background level with a nonzero gradient. The proposed method uses a scattering vector to determine the background and is validated on the XRD peak of a polymer sample.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Monika Rani, Raashid Ahmad Siddiqi, Gurbir Singh, Ravish Kumar, Dalbir Singh Sogi, Balmeet Singh Gill
Summary: Different extraction methods were studied for gliadin extraction from wheat, with DuPont showing higher zeta potential and smaller particle size compared to other methods. TEM studies revealed compact globular particle arrangement in DuPont and Wallace extracted gliadin.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Materials Science, Multidisciplinary
S. N. Sarangi, S. Acharya, S. K. Biswal, K. K. Nanda
Summary: We investigated the effects of Cu doping on the structure, morphology, magnetic properties, cytotoxicity, and biocompatibility of ZnO nanostructures. Our results show that the incorporation of Cu2+ ions inhibits the growth of nanorods and leads to the disappearance of nanorod morphology at higher doping levels. X-ray photoelectron spectroscopy confirms that Cu ions substitute Zn2+ sites in their divalent state. Magnetic measurements reveal a significant change in the magnetic features due to doping. Cytotoxicity assessment demonstrates that Cu-doped ZnO samples are non-toxic. Our findings suggest the potential usefulness of Cu doping in spintronic/magnetic media devices and as a promising approach for new functional biomaterials in biomedical applications.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yeonggeun Cho, Hyung-Jun Cho, Sung-Joon Kim
Summary: The effects of C and N on hydrogen embrittlement (HE) were investigated. C and N increased tensile strength through solid solution hardening and high-density dislocation accumulation, with C being more effective than N in further strengthening through active TWIP effect. The lattice expansion caused by C and N reduced hydrogen diffusivity and depth of the hydrogen-affected zone, enhancing the resistance to HE. C further enhanced the resistance to HE compared to N due to lower hydrogen diffusivity, lower crack severity, and active cross slip.
Article
Chemistry, Physical
S. Kazim, D. Mastrippolito, P. Moras, M. Jugovac, T. Klimczuk, M. Ali, L. Ottaviano, R. Gunnella
Summary: We investigated the challenging CrCl3 surface using photon energy dependent photoemission (PE). By studying the core and valence electrons of cleaved single crystals in either ultra-high vacuum (UHV) or air, we confirmed the atomic composition with respect to the expected bulk atomic structure. The presence of a stable, but only partially ordered Cl-O-Cr surface was revealed by a common spectroscopic denominator. Through analysis of multiplet components, we quantified the electron charge transfer and the reduced crystal field due to the established polarization field. The methodology used in this study can have a significant impact on determining the structure of ordered sub-oxide phases in mono or bi-layer Cr trihalides.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Analytical
Roshana T. Maske, Atul N. Yerpude, Rupesh S. Wandhare, Sanjay J. Dhoble
Summary: The CaAlBO4:RE (RE = Dy3+, Eu3+, Sm3+) phosphor was synthesized and characterized using various techniques including XRD, FTIR, SEM, EDS, PL spectra, and CIE coordinates. The results confirmed the composition and crystal structure of the phosphor and revealed its potential application in eco-friendly lightning technology.
Article
Chemistry, Multidisciplinary
Shuo Feng, Rajesh Kumar Singh, Yucheng Fu, Zhuo Li, Yulong Wang, Jie Bao, Zhijie Xu, Guosheng Li, Cassidy Anderson, Lili Shi, Yuehe Lin, Peter G. Khalifah, Wei Wang, Jun Liu, Jie Xiao, Dongping Lu
Summary: In this study, a simple strategy was demonstrated for constructing low-tortuosity through-pores in both vertical and planar directions of electrodes by casting large particles into single-particle-layer electrodes. Through multi-scale characterizations and simulations, correlations between material/electrode structures, electrolyte permeability, polysulfide migration, and sulfur reactions were elucidated. The high-loading and dense sulfur cathode fabricated by this method delivers a high specific capacity at a very low electrolyte/sulfur ratio.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
J. Leon-Flores, J. L. Perez-Mazariego, E. T. Olmedo-Resendiz, M. L. Marquina, R. Escamilla, R. Gomez, J. Arenas-Alatorre
Summary: A 'shocking thermal treatment' methodology has been presented as an modification to the molten salts process to quickly synthesize pure phase nickel ferrite nanoparticles. The nanostructures were confirmed by X-ray diffraction and electron microscopy, with an average crystallite size of 55-85 nm. Mossbauer spectroscopy and magnetic measurements showed that the nanoparticles exhibit superparamagnetic behavior, with a magnetic saturation of 47.9 emu g(-1). The effect of the shocking thermal treatment on the electronic structure was elucidated by estimating the optical band gap, which ranged from 1.78 to 2.38 eV.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
R. Cardoso de Oliveira, D. Demaille, N. Casaretto, Y. J. Zheng, M. Marangolo, D. H. Mosca, J. Varalda
Summary: Mn5Ge3 thin films were grown on GaAs(111) and GaAs(001) by Molecular Beam Epitaxy (MBE), with the influence of stoichiometry and alloying investigated using different Mn diffusion cell temperatures for each sample. X-ray diffraction (XRD) measurements revealed the epitaxial relations, while high-resolution transmission electron microscopy (HRTEM) results showed grains with different orientations and energy-filtered transmission electron microscopy (EFTEM) analysis indicated similar manganese content in all grains. The magnetocaloric effect in both sample families exhibited broader temperature range and higher magnetic entropy change peak compared to bulk Mn5.1Ge2.9, making Mn5Ge3 a potential candidate for magnetic refrigeration without using rare earth materials.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sadegh Pour-Ali, Reza Tavangar, Faezeh Akhtari, Seyedsina Hejazi
Summary: The oxidation behavior of GTD-111 Ni-based superalloys with ultrafine-grained surface and polycrystalline counterpart in Ar + 20% O2 at 900 degrees C is studied. The presence of high diffusivity paths on the surface of the ultrafine-grained sample significantly increases the diffusion of scale-former elements and oxygen anions, resulting in a three-layer oxide film that ensures better oxidation performance. Grain refinement reduces the critical concentration of Al for forming a continuous alumina layer.
Review
Chemistry, Multidisciplinary
Ramya Krishna Battula, Chandran Sudakar, Puttaiah Bhyrappa, Ganapathy Veerappan, Easwaramoorthi Ramasamy
Summary: A new platform for research and development of inexpensive and efficient solar cells has emerged based on hybrid perovskite absorber material. Single-crystalline perovskite materials offer superior stability and improved performance compared to polycrystalline perovskites, making them more relevant for solar cell applications.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Conrad Szczuka, Bora Karasulu, Matthias F. Groh, Farheen N. Sayed, Timothy J. Sherman, Joshua D. Bocarsly, Sundeep Vema, Svetlana Menkin, Steffen P. Emge, Andrew J. Morris, Clare P. Grey
Summary: This article presents a new highly conducting solid solution as a promising electrolyte material for all-solid-state batteries. By combining structure predictions and solid-state synthesis, they achieved a balance between high ionic conductivity and thermodynamic stability towards lithium.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Y. Lokeswararao, M. Viji, Akshay Kumar Budumuru, C. Sudarshan, Sanjiv Kumar, C. Sudakar
Summary: This study successfully synthesized Li2VP2O7F material through sol-gel method and found that the material exhibits excellent electrochemical performance. Detailed structural studies revealed that Li2VP2O7F is actually composed of a nearly equimolar structural mixture of three different phases.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Ramya Krishna Battula, C. Sudakar, P. Bhyrappa, Ganapathy Veerappan, Easwaramoorthi Ramasamy
Summary: MAPbI3 perovskite absorber ink is obtained by vapor mediated approach from MAPbI3 single crystals and shows improved performance compared to the conventional powder derived film. The single crystal derived ink exhibits a blue shift in photoluminescence emission and results in higher power conversion efficiency (PCE) and better stability of the perovskite solar cells (PSC) compared to the powder derived film.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Athrey Cholasettyhalli Dakshinamurthy, Mayank Gupta, Birabar Ranjit Kumar Nanda, Chandran Sudakar
Summary: Anionic alloying in lead-free halide double perovskites is an effective strategy to tailor optoelectronic properties. Raman spectral analyses show that halide ions preferentially form Br-rich or Cl-rich octahedra in Cs2AgBiBr6-xClx double perovskites. First-principles calculations further confirm that the alloyed structure with preferential occupation of halide ions is more stable.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Ramya Krishna Battula, Ganapathy Veerappan, P. Bhyrappa, C. Sudakar, Easwaramoorthi Ramasamy
Summary: This study demonstrates the direct growth of single crystalline metal halide perovskite absorber films on charge selective contact layer coated substrates, which shows higher stability and endurance to ambient conditions compared to polycrystalline perovskite films. The use of antisolvent-assisted inverse temperature crystallization method results in ultra-stable circular shaped films suitable for photovoltaic applications.
SURFACES AND INTERFACES
(2023)
Article
Optics
Subitan Laskar, Athrey C. Dakshinamurthy, Sivakumar Chithamallu, C. Sudarshan, C. Sudakar
Summary: Whispering gallery mode (WGM) lasing is achieved in CsPbI3 quantum dots (QDs) coated on TiO2 spherical microcavities. The photoluminescence emission from the CsPbI3-QDs gain medium strongly couples with the TiO2 microspherical resonating optical cavity. Above a threshold point of 708.7 W/cm2, spontaneous emission in the microcavities switches to stimulated emission, resulting in increased lasing intensity as the power density increases.
Article
Materials Science, Multidisciplinary
Athrey C. Dakshinamurthy, C. Sudakar
Summary: In this study, comprehensive vibrational studies using micro-Raman spectroscopy were conducted to investigate the influence of octahedral cation substitution on lattice vibrations in metal halide double perovskites. It was found that Na+ substitution enhanced the F-2g mode intensity and improved cationic ordering. The symmetric stretching A(1g) mode was mainly influenced by the octahedral cations, while the appearance of distinct octahedral modes can be attributed to B ''-site substitution. The presence of asymmetric-stretching vibrations (E-g) indicated sublattice distortions in the lattice.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Applied
Sayan Ghosh, C. Sudarshan, C. Sudakar
Summary: This study investigates how sintering conditions and grain boundary engineering can improve the ionic conductivity of LATP ceramics. By using Raman spectroscopy, the changes in vibrational mode characteristics of LATP ceramics with temperature are monitored, revealing the influence of sintering conditions on ionic migration and conductivity.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Y. Lokeswararao, Athrey C. Dakshinamurthy, Akshay Kumar Budumuru, C. Sudakar
Summary: This study examines the electrochemical performances of Li3V2(PO4)(3) with thin-carbon coating (LVP/C) in nanoparticulate (LVP/C-np) and nanofibrous (LVP/C-nf) morphologies synthesized using sol-gel and electrospinning processes, respectively. The results show that the nanoparticle cathodes exhibit higher capacity fading than the nanofibrous cathodes with increasing C-rate. LVP/C-np and LVP/C-nf cathodes exhibit a discharge capacity of 137 mA h g(-1) and 124 mA h g(-1) at 0.1 C rate.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Physical
Sundeep Vema, Farheen N. Sayed, Supreeth Nagendran, Burcu Karagoz, Christian Sternemann, Michael Paulus, Georg Held, Clare P. Grey
Summary: Garnet solid-electrolyte-based Li-metal batteries have the potential to be used in high-energy density and thermally stable energy storage devices. However, the formation of lithium hydroxide and carbonate on the garnet surface in an ambient atmosphere poses processing challenges. This study investigates the decomposition of surface layers under different gas environments and identifies that heating under an oxygen atmosphere leads to a clean garnet surface, while low oxygen partial pressures result in additional carbon deposits. The clean garnet surface reacts with moisture and carbon dioxide, indicating a need for control over CO2 concentration during garnet handling. Symmetric cells with low interface resistance and dendrite-free plating currents are achieved by heating under O₂ and avoiding H₂O and CO₂.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Akshay Kumar Budumuru, Lokeswararao Yelamnchi, Chandran Sudakar
Summary: Sb1.9Al0.1S3 nanorods with constrained cutoff voltage in the alloying regime exhibit excellent electrochemical performance, providing an initial capacity of around 450 mA h g(-1) and showing excellent cycling stability with 63% retention (around 240 mA h g(-1) after 1000 cycles at 5C-rate) compared to 71.4 mA h g(-1) after 500 cycles observed in full-regime cycling. The formation of crystalline Sb(Al) in Sb1.9Al0.1S3 and the retention of nanorod microstructure enhance its performance, while Sb2S3 nanorod electrodes get pulverized and show microcracks. Percolating Sb nanoparticles buffered by the Li2S matrix and other polysulfides contribute to the improved performance of the electrode. These findings pave the way for high-energy and high-power density LIBs with alloy anodes.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Laura L. Driscoll, Elizabeth H. Driscoll, Bo Dong, Farheen N. Sayed, Jacob N. Wilson, Christopher A. O'Keefe, Dominic J. Gardner, Clare P. Grey, Phoebe K. Allan, Adam A. L. Michalchuk, Peter R. Slater
Summary: The synthesis of Li ion battery materials via ball milling has seen significant growth, resulting in the discovery of new high-capacity electrode materials. This study challenges the commonly assumed local heating effects during the milling process, showing that other factors, such as shockwaves and localized pressure, play a crucial role in phase transformations. The research provides a greater understanding of milling as a synthetic pathway and suggests alternative strategies for material preparation.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Rosa Muller, Olivia Georghiades, Joshua D. Bocarsly, Farheen N. Sayed, Victor Riesgo-Gonzalez, Andrew D. Bond, Clare P. Grey, Dominic S. Wright
Summary: This study investigates the potential of lanthanide-containing polyoxotitanates as single-source precursors for hybrid oxides. The properties of the compounds were characterized using magnetic measurements, and their stability at high temperatures was observed.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Athrey Cholasettyhalli Dakshinamurthy, Mayank Gupta, Birabar Ranjit Kumar Nanda, Chandran Sudakar
Summary: Anionic alloying in lead-free halide double perovskites is an effective strategy to tailor their optoelectronic properties. However, it has been found that halide ions do not mix uniformly at the atomic scale and tend to form octahedral structures rich in a particular halogen. This preferential occupation of halide ions in the alloyed structure is more stable compared to local phase segregation or homogeneous mixing. The variation in the band gap is primarily correlated to the concentration of Cl and Br anions rather than their distribution in individual octahedra.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
