Article
Chemistry, Multidisciplinary
Koichi Tanaka, Pedro Arias, Koki Hojo, Tomoyasu Watanabe, Michael E. Liao, Angel Aleman, Hicham Zaid, Mark S. Goorsky, Suneel Kumar Kodambaka
Summary: We report a phenomenon in which thin films sputter deposited on single-crystalline Al2O3(0001) substrates exposed to borazine show higher orientation compared to those grown on bare Al2O3(0001). This was observed in Pd, Mo, and Ta2C thin films grown on Al2O3(0001). Interestingly, intermittent exposure to borazine during the growth of Ta2C thin films leads to better crystallinity than direct deposition. We attribute these results to enhanced adatom mobilities on, and with, surfaces to borazine during deposition.
Article
Optics
Anoop Kumar Singh, Chao-Chun Yen, Kai-Ping Chang, Dong-Sing Wuu
Summary: This work discusses the growth, composition, and photoluminescence properties of Zn-doped Ga2O3 (ZnGaO) films. By doping Zn in ll-Ga2O3, the n-type conductivity of ll-Ga2O3 can be modulated to p-type. ZnGaO films with varying Zn contents were deposited on sapphire substrates, and X-ray analysis confirmed the stability of Zn dopant up to 8.62% in ZnGaO films. X-ray photoelectron spectroscopy revealed the increasing Zn content in ZnGaO films. The inclusion of Zn dopant in Ga2O3 films led to a shift in the peak emission wavelength of ll-Ga2O3 in the photoluminescence spectra, indicating the formation of more defect states and inducing green luminescence. The positive Hall coefficient of ZnGaO films verifies their p-type nature.
JOURNAL OF LUMINESCENCE
(2023)
Article
Physics, Applied
Phuoc Toan Tran, Hai Dang Ngo, Thien Duc Ngo, Tadaaki Nagao
Summary: The study demonstrates the growth of uniaxially oriented nickel aluminum (NiAl) films with excellent plasmonic performance under in-situ heating conditions, making them promising for applications in photothermal energy.
APPLIED PHYSICS EXPRESS
(2021)
Article
Materials Science, Coatings & Films
Neeraj Nepal, D. Scott Katzer, Andrew C. Lang, Brian P. Downey, Matthew T. Hardy, David J. Meyer
Summary: Tantalum nitride (γ-Ta2N) thin films were grown on 3 in. diameter 6H- or 4H-SiC substrates by radiofrequency plasma molecular beam epitaxy (MBE). The MBE grown layers showed epitaxial characteristics and nearly pure γ-Ta2N phase. The lattice parameters and strain of the films on SiC were measured. Additionally, the MBE growth of AlN/γ-Ta2N /SiC heterostructures was demonstrated.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Materials Science, Multidisciplinary
Jyotirmoy Roy, Pajjuru Ravi Teja, Savita Sahu, G. A. Basheed, R. B. Gangineni
Summary: The influence of in-situ annealing temperature on the structural, microstructural, magnetic properties, and Gilbert damping parameters of sputtered Fe3O4 thin films was systematically investigated. The evaluation of the structural phase was done using X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. The surface microstructural images revealed enhanced grain growth with dominant anti-phase boundaries (APB) after in-situ annealing. The ferromagnetic resonance spectroscopy showed a low Gilbert damping value for all the in-situ annealed Fe3O4 thin films, with the high inhomogeneity parameter correlated to surface defects and APBs.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tyler Stabile, Yize Stephanie Li
Summary: This study investigates the deposition of strained alpha-Sn thin films on highly lattice-mismatched Ge (100) substrates by physical vapor deposition, using different cleaning methods. The results show that the morphology of thin films is significantly influenced by the cleaning method. It is demonstrated that the alpha-Sn thin films deposited on Ge substrates exhibit n-type electrical properties and may hold potential for advanced electronics and photonics applications.
MATERIALS TODAY ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
M. A. Hamad, O. M. Hemeda, Hatem R. Alamri, A. M. Mohamed, Mohamed E. Harb
Summary: The study simulated the magnetization versus temperature dependence of highly (001)-oriented LSM thin films prepared under different oxygen growth pressures to predict magnetocaloric effect. Results show that the MCE of these films is strongly tunable with oxygen growth pressure and is enhanced with increasing pressure. Comparison with other works indicates that the MCE parameters of these films are considerably larger and comparable, suggesting their potential use as functional materials in magnetic refrigeration.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Electrical & Electronic
Cicero L. A. Cunha, Tales C. Pimenta, Mariana A. Fraga
Summary: A method for growing highly (100)-oriented aluminum nitride thin films on silicon substrate in poor vacuum systems using radio frequency magnetron sputtering has been developed. The films produced under near ideal deposition conditions exhibit good quality with stoichiometry close to 1:1 and low oxygen concentrations. These films, showing potential for surface acoustic wave sensing devices, were characterized using various techniques including RBS, XRD, Fourier transform infrared, and Raman spectroscopy.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Chemistry, Physical
Chao Ping Liu, Chun Yuen Ho, Kingsley O. Egbo, Zhan Hua Li, Cong Kang Xu, Kin Man Yu
Summary: Highly mismatched alloys offer unique opportunities for controlling electronic band structures and optoelectronic properties, with specific effects observed in ZnO1-xTex alloys synthesized over a range of compositions. The introduction of certain dopants leads to distinct changes in material conductivity and band structures, revealing potential applications for tailored device functionality.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Jingxiang Su, Simon Fichtner, Muhammad Zubair Ghori, Niklas Wolff, Md Redwanul Islam, Andriy Lotnyk, Dirk Kaden, Florian Niekiel, Lorenz Kienle, Bernhard Wagner, Fabian Lofink
Summary: This work presents a method for growing highly c-axis oriented aluminum scandium nitride (AlScN) thin films on various substrates. The method is especially useful for applications like piezoelectric thin-film-based surface acoustic wave devices. The researchers use a thin AlN layer as a nucleation layer for the growth of AlScN films, which significantly improves the crystal quality of the films on different substrates.
Article
Chemistry, Physical
Yoonho Ahn, Jong Yeog Son
Summary: In this study, strain-induced ferroelectric properties of Bi3TaTiO9 (BTTO) thin films were examined as an alternate lead-free material. The BTTO thin film grown on the Rh substrate exhibited improved ferroelectric properties and has potential device applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Haifa A. A. Alyousef, A. M. Hassan, Hesham M. H. Zakaly
Summary: This study investigates the structural and optical characteristics of aluminum nitride (AlN) thin films deposited using reactive magnetron sputtering. The results show that the AlN thin films have a wurtzite structure with a preferred orientation, and the average particle size is in the range of 80-83 nm. The AlN thin films have potential applications due to their transparent properties and increased bandgap with increasing work pressure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Zhe Chuan Feng, Hao-Hsiung Lin, Bin Xin, Shi-Jane Tsai, Vishal Saravade, Jeffrey Yiin, Benjamin Klein, Ian T. Ferguson
Summary: The hetero-epitaxy of 3C-SiC on Si-face and C-face 4H-SiC was experimentally investigated, and a corresponding growth model was identified. This study provides valuable insights for band-gap engineering and various applications of SiC.
Article
Materials Science, Multidisciplinary
G. A. Ramirez, A. Moya-Riffo, J. E. Gomez, F. Malamud, L. M. Rodriguez, D. Fregenal, G. Bernardi, A. Butera, J. Milano
Summary: This study systematically investigated the relationship between elastic behavior and structural properties of polycrystalline Fe0.89Ga0.11 thin films deposited on Si(100) substrates. The results showed that the weights of texture components varied with Ar pressure, residual stress relaxed with increasing Ar pressure, and Young's modulus values remained relatively constant within the studied range of Ar pressure. Additionally, the behavior of residual stress and Young's modulus was correlated with the microstructure evolution.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Maxime Hallot, Pascal Roussel, Christophe Lethien
Summary: This paper presents a detailed study on the influence of sputtering deposition parameters on the electrochemical properties of electrodes for lithium-ion microbatteries. The research aims to optimize the performance and investigate the relationship between structure and electrochemical properties.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Astronomy & Astrophysics
Anirban Dutta, D. K. Sahu, G. C. Anupama, Simran Joharle, Brajesh Kumar, A. J. Nayana, Avinash Singh, Harsh Kumar, Varun Bhalerao, Sudhansu Barway
Summary: This study presents optical UBVRI photometry and spectroscopic observations of type Iax supernova SN 2020sck. The results indicate the composition and density distribution of the synthesized ejecta in the explosion, as well as the star formation rate of the host galaxy.
ASTROPHYSICAL JOURNAL
(2022)
Article
Surgery
Manjunath Maruti Pol, Devender Singh, Brijesh Kumar, Surabhi Vyas, Gaurav Joshi, Tulasi Ram, V Sreenivas
Summary: Cephalic veins with a diameter of less than or equal to 2.5 mm are associated with a high failure rate. Preoperative balloon angioplasty can improve the patency rate of arteriovenous fistula (AVF) compared to hydrostatic technique. This study compared the efficacy of two surgical techniques (hydrostatic dilatation with balloon angioplasty (HD + BA) versus hydrostatic dilatation with malleable dilatation (HD + MD)) on the patency rates of AVF in patients with cephalic veins with a diameter of less than or equal to 2 mm.
INDIAN JOURNAL OF SURGERY
(2023)
Article
Thermodynamics
Umakant N. Shete, Ravi Kumar, Ramesh Chandra
Summary: Nucleated pool boiling heat transfer experiments were conducted on plain and five different reentrant cavity copper tube surfaces using saturated R134a, R32, and R600a. It was found that the boiling heat transfer coefficient significantly increased with the presence of the reentrant cavity structure, being 1.2-2.8 times higher than that of the plain tube surfaces. A correlation for the reentrant cavity surfaces was also developed.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Chemistry, Applied
Vijaya Shukla, Vikas Bajpai, Pratibha Singh, Prashant Rai, Nilesh Khandelwal, Anil N. Gaikwad, Bikarma Singh, Brijesh Kumar
Summary: This study confirmed the traditional use of Chamaecostus cuspidatus and Cheilocostus speciosus in treating diabetes and reducing lipid levels through qualitative and quantitative analysis as well as in-vitro experiments. The content of bioactive compounds varied significantly among different organs. The anti-adipogenic potential of specific parts of these plants was also observed.
NATURAL PRODUCT RESEARCH
(2023)
Article
Medicine, Research & Experimental
Ruizhong Wang, Brijesh Kumar, Emma H. Doud, Amber L. Mosley, Matthew S. Alexander, Louis M. Kunkel, Harikrishna Nakshatri
Summary: miR-486 has the potential to reverse skeletal muscle defects and reduce tumor growth in muscular dystrophy and cancer.
MOLECULAR THERAPY-NUCLEIC ACIDS
(2022)
Article
Materials Science, Ceramics
Arvind Kumar, Ashwani Kumar, Shekhar Tyagi, Ramesh Chandra, Davinder Kaur
Summary: This study investigates the in-situ growth of nanoflakes structure in Bi0.9La0.1Fe0.5Mn0.5O3 (BLFMO) thin films. The study demonstrates that the use of a LNO buffer layer allows for controlled growth of BLFMO thin films with a specific crystal structure. The compact and densely packed nanoflake structures in the BLFMO thin film samples are confirmed by surface morphological investigations. The study also explores the leakage current behavior and tunability of BLFMO thin films, presenting valuable insights for the fabrication of thin film based ferroelectric memory devices.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Alisha Arora, Satyendra Mourya, Neetika Singh, Sandeep Kumar, Ramesh Chandra, V. K. Malik
Summary: The fabrication of silicon carbide (SiC) thin films, which are essential for high-temperature and high-power applications, has been a major challenge in wide bandgap semiconductor research. This work presents the growth of crystalline thin film on p-type silicon substrate at high temperature (> 900 degrees C), unlike most reported SiC thin films produced by RF sputtering that are amorphous. A metal-semiconductor-metal (MSM) device with gold (Au) electrodes is fabricated, and unique current-voltage (I-V) characteristics are observed in different voltage regimes. The analysis of the I-V characteristics reveals two dominant current transport mechanisms, namely variable range hopping mechanism (VRH) below 1 V and ohmic conduction followed by space charge limited conduction (SCLC) above 1 V. This study also provides valuable information about disorder states, trap centers, interface states, and deep traps, which can be utilized for the design of opto-electronic, magnetic, and efficient energy storage devices to maximize performance.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Gaurav Malik, Satyendra Kumar Mourya, Ananya Garg, Priyanka, Ramesh Chandra
Summary: The present work demonstrates a direct sputtering synthesis approach for a nano-porous ZnO electrode on indium tin oxide (ITO) substrate. The electrochromic and electrochemical performance of the fabricated electrode was examined using two well-known techniques, UV-Vis spectroscopy and cyclic voltammetry (CV). The results confirm the excellent prospects of novel and cheap ZnO-based electrodes with integrated functionality for efficient optoelectronic and solid-state energy storage devices.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Samta Manori, Prayas Singh, Priya Yadav, Ashwani Kumar, Ramesh Chandra, K. K. Raina, Ravi Kumar Shukla
Summary: We synthesized surfactant/additives free single domain superparamagnetic Fe3O4 nanoparticles by rapid microwave synthesis method. The nanoparticles have granular shape with an average size of 14 nm and were crystallized in the magnetite lattice. The nanocomposites of these nanoparticles and beta-phase PVDF exhibited shear thinning to shear thickening transition, decrease in zero shear viscosity, and long frequency range viscoelastic behavior as a function of increasing nanoparticle concentration. These nanocomposites could find applications in flexible magnetic and mechanical films for soft body armor and memory storage.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Physics, Multidisciplinary
Abhijeet Das, Jyoti Jaiswal, RamPratap Yadav, A. K. Mittal, Stefan Talu, Sanjeev Kumar
Summary: We studied the complex roughening and wettability mechanism of sputtered MoS2 film surfaces with varying thickness using fractal geometry. The results showed that shadowing dominated at lower thickness, while higher thicknesses exhibited an increase in vertical growth rate and variation in local irregularities. The wettability increased with thickness, and the mechanism for this increase is attributed to the decrease in surface complexities. These findings have implications for surface engineering of MoS2 thin films for electrochemical water splitting reactions.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Review
Chemistry, Physical
Amit Gupta, Ashish P. Singh, Varsha K. Singh, Prashant R. Singh, Jyoti Jaiswal, Neha Kumari, Vijay Upadhye, Suresh C. Singh, Rajeshwar P. Sinha
Summary: Ultraviolet radiation (UVR) is known to cause skin disorders and natural sun screening compounds have gained attention for treating these disorders. Natural UV-absorbing compounds have been used as alternatives to synthetic sunscreen molecules. Additionally, research on DNA-repair enzymes utilized in sunscreens and their effect on photoaging has increased.
Article
Multidisciplinary Sciences
Abhijeet Das, Jyoti Jaiswal, Chandra Kamal Borah, Itum Ruti, Robert S. Matos, Erveton P. Pinto, R. P. Yadav, Stefan Talu, Sanjeev Kumar
Summary: In this study, the nonlinear roughening in anatase thin films and its correlation with the optical properties are investigated through fractal geometry analysis. The self-affine nature of the surfaces is confirmed and the Kardar-Parisi-Zhang scaling in surface growth is found. The surfaces analyzed show insignificant multifractal characteristics. Fractal analysis explains the roughening trend and validates the significance of fractal dimension for probing surface roughening. Regression equations are proposed for tuning the optical bandgap based on the fractal dimension and root mean-squared surface slope.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Nanoscience & Nanotechnology
Jyoti Jaiswal, Abhijeet Das, Vivek Chetry, Sanjeev Kumar, Ramesh Chandra, Kazuyoshi Tsuchiya
Summary: In this study, an improved sub-ppm H2 gas sensor based on Pt decorated vertically aligned porous VxOy nanofilms (Pt/VxOy) was developed using the magnetron sputtering technique. The Pt/VxOy nanofilm sensors exhibited high sensing response and fast response/recovery time to H2 gas at different temperatures. In addition, the selectivity, repeatability, and durability of the Pt/VxOy nanofilm sensors were also tested.
ACS APPLIED NANO MATERIALS
(2023)
Article
Agriculture, Multidisciplinary
Jyoti Jaiswal, Amit Kumar Srivastav, Pradeep Kumar Rajput, Umesh C. S. Yadav, Umesh Kumar
Summary: This study aimed to improve the solubility and stability of cordycepin by encapsulating it in bovine serum albumin: beta-cyclodextrin nanoparticles. The synthesized nanoparticles showed sustained release of cordycepin and improved stability. In vitro studies also demonstrated greater cytotoxicity of the synthesized nanoparticles compared to free cordycepin.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Review
Biotechnology & Applied Microbiology
Varsha K. Singh, Sapana Jha, Palak Rana, Amit Gupta, Ashish P. Singh, Neha Kumari, Sonal Mishra, Prashant R. Singh, Jyoti Jaiswal, Rajeshwar P. Sinha
Summary: Currently, the synthetic UV-absorbing compounds used in sunscreens are derived from non-renewable petrochemicals. To address this issue, it is necessary to develop a sustainable manufacturing process for the production of naturally occurring UV-absorbing compounds called mycosporine-like amino acids (MAAs). However, the commercial production of MAAs for sunscreens is currently not feasible due to low yield and the lack of fermentation technology. This review aims to provide insights into the biochemical properties of MAAs, biosynthetic gene clusters, carbon flux processes, and strategies for engineering suitable cyanobacteria for cost-effective production of natural sunscreens.
FERMENTATION-BASEL
(2023)