Article
Materials Science, Ceramics
M. D. Hossain, A. Masud, M. N. I. Khan, S. S. Sikder
Summary: Nanostructured Bi0.9Eu0.1FeO3 (BEFO), Ni0.6Zn0.4Fe2O4 (NZF), and (1-x).BEFO + x.NZF composites have been synthesized and characterized. The addition of NZF content in the composites modified their magnetic and dielectric properties. The optimized 0.9 BEFO + 0.1 NZF composite showed the highest permeability and dielectric values with the least amount of losses.
CERAMICS INTERNATIONAL
(2023)
Article
Environmental Sciences
Umesh Chejara, Anamika Prajapati, Arvind Kumar
Summary: This study synthesized and characterized nano-particles of polycrystalline magnesium and iron ferrite doped with rare earth materials. The electrical properties of these materials were measured, and it was found that they exhibit variation behavior with respect to frequency. The study suggests that these materials may have potential applications in the fabrication of microwave antennas to reduce energy losses.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Ceramics
Jutapol Jumpatam, Jirata Prachamon, Jakkree Boonlakhorn, Nutthakritta Phromviyo, Narong Chanlek, Prasit Thongbai
Summary: A solid-state reaction method was used to prepare CaCu3-xMgxTi4O12-2xF2x ceramics with different Mg and F co-doping ratios. The effect of doping ratio on the structure and properties of the ceramics was studied.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2022)
Article
Materials Science, Multidisciplinary
S. Udhayakumar, G. Jagadish Kumar, E. Senthil Kumar, M. Navaneethan, K. Kamala Bharathi
Summary: The introduction of Sr doping into LiFe5O8 bulk material results in an enhanced dielectric constant and reduced dielectric loss. The Sr-doped samples exhibit relaxation behavior suitable for high frequency applications. Temperature and frequency dependent measurements show promising results for practical use.
Article
Materials Science, Textiles
Yaya Zhang, Jiyong Hu, Xiong Yan, Huating Tu
Summary: The thickness and dielectric properties of fabric substrate are crucial in the design of wearable antennas, with a thicker substrate with low dielectric constant and high loss tangent enhancing antenna bandwidth. Sewing multiple fabrics together can increase thickness while maintaining flexibility, but controlling dielectric properties is challenging due to the lack of relationship between materials. A proposed circuit model was used to establish equivalent capacitance and resistance models for sewed multilayer fabric to predict its loss tangent, showing good agreement with experimental results and providing a basis for multilayer flexible electronic substrate design.
TEXTILE RESEARCH JOURNAL
(2022)
Article
Physics, Condensed Matter
Bandana Panda, Ram Naresh Prasad Choudhary
Summary: A new compound was synthesized using a solid-state reaction method and its physical properties were investigated. The compound shows potential applications in high-frequency devices according to its structural and electrical characteristics.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Instruments & Instrumentation
Haiping Zhou, Yanjun Wang, Yuexin Gao, Ze Zhang, Siyu Liu, Yanyan Wang, Meijie Yu, Xianming Wang, Chengguo Wang
Summary: This study prepared composite coatings with low infrared emissivity and low dielectric properties using modified EPDM as binder. Appropriate grafting modification significantly improved the mechanical properties of the composite coatings. The effects of grafting modification on the infrared emissivity and dielectric properties were minimal. The study revealed the mechanism of improved compatibility and interfacial bonding between filler and binder due to grafting modification.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Theeranuch Nachaithong, Pairot Moontragoon, Prasit Thongbai
Summary: The (Zn, Nb)-codoped TiO2 nanopowder and ceramic with highly dense microstructure were successfully synthesized. The ZNTO ceramic exhibited thermally activated giant dielectric relaxation, and the outer surface layer had a slight effect on the dielectric properties. Theoretical calculations revealed the presence of specific defect clusters, supporting the absence of electron-pinned defect-dipoles and suggesting an alternative mechanism for the giant dielectric properties.
Article
Physics, Multidisciplinary
Santhosh M. Kumar, Hassan A. H. Alzahrani, G. J. Shankaramurthy, K. K. Nagaraja, Abdulmohsen O. Alsaiari, B. M. Prasanna, N. Chandamma
Summary: In this study, the effect of gamma-irradiation on the structural and AC electrical properties of Ni-Zn nanoparticles was investigated. XRD analysis showed a decrease in crystallite size with increasing Zn2+ ion concentration, and irradiation influenced the crystallite size. The lattice constant increased with Zn2+ concentration, but changes occurred after irradiation. Irradiation also affected the lattice strain and morphology of the samples. In terms of AC electrical properties, irradiation increased the dielectric constant but decreased the dielectric loss and AC conductivity, and the type of dielectric relaxation changed.
Article
Computer Science, Information Systems
Jurgen K. A. Nogueira, Joao G. D. Oliveira, Samuel B. Paiva, Valdemir P. Silva Neto, Adaildo G. D'Assuncao
Summary: A sensor is proposed to characterize the complex permittivity of dielectric materials in a non-destructive and non-invasive way. The sensor is based on a rectangular patch microstrip two-port circuit with a complementary split-ring resonator (CSRR) element. The sensitivity analysis is determined by varying the permittivity of the material under test (MUT). The proposed sensor is simulated and analyzed using Ansoft HFSS software, and the results show good agreement with measurements made on two different dielectric material samples with known complex permittivity values.
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Narong Chanlek, Jedsada Manyam, Pornjuk Srepusharawoot, Sriprajak Krongsuk, Prasit Thongbai
Summary: In this study, greatly enhanced breakdown electric field and nonlinear coefficient with reduced tan delta were achieved by simultaneous partial substitution of CCTO with acceptor-donor (Al3+, Ta5+) dopants to produce (Al3+, Ta5+)-CCTO ceramics. The improved electrical properties were attributed to the synergistic effects of the co-dopants in the doped CCTO structure, leading to enhanced grain boundary resistance. These results provide useful guidelines for developing new giant dielectric ceramics with excellent dielectric properties.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Environmental Sciences
RubalyaValantina Sathianathan, Aniruthaan Kannapiran, Natarajan Shanmugam
Summary: The study analyzed the oxidative stability of groundnut oil and mustard oil blended with varying concentrations of alpha-tocopherol and TBHQ, finding that these antioxidants have a regulating effect on the insulation nature of the oil, with alpha-tocopherol showing a more effective synergistic effect. Higher breakdown voltage and greater stability were observed in oils with the addition of antioxidants in low concentrations, with potential implications for selecting eco-friendly coolants in engineering and industry.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Computer Science, Information Systems
Longzhu Cai
Summary: This paper introduces an embedded resonator method for microwave substrate characterization, which can calculate the effective dielectric constant of the structure and substrate, and determine quality factors. Experimental results show that the method has high extraction accuracy.
Article
Chemistry, Physical
K. S. Ashraff Ali, M. M. Ravikumar, J. Mohammed, Naeim Farouk, V. Mohanavel, M. Ravichandran
Summary: This study reported the microwave absorption properties of BaFe12O19, carbon fiber@Fe3O4 composite, and graphene@BaFe12O19@Fe3O4 composite, and their effects on the microwave absorption performance. Increasing filler loading in different combinations can enhance microwave absorption capabilities within a certain range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Azim Uddin, Diana Estevez, Rabia Khatoon, Faxiang Qin
Summary: With the miniaturization and integration of electronic components, the demand for low-cost flexible composites with temperature-stable high dielectric constant and low loss has increased. This study developed silicone elastomer composites based on hydrothermally grown MoS2 on tissue paper-derived cellulose carbon (CC). The composites showed high dielectric constant and low loss, as well as flexibility and temperature stability, making them attractive for microstrip antenna applications and extreme environment electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Prathvi, S. Asha Bhandarkar, Akshayakumar Kompa, Dhananjaya Kekuda, M. S. Murari, Maksim P. Telenkov, K. K. Nagaraja, K. Mohan Rao
Summary: The study found that with increasing Zn2+ concentration, the crystallite size of anatase phase in the thin films decreased, light absorption increased, and the bandgap narrowed. FESEM revealed a homogeneous distribution of grains in the films.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Nagaraj S. Naik, Mahesh Padaki, Arun M. Isloor, K. K. Nagaraja, K. A. Vishnumurthy
Summary: The study introduces a new polymeric blend selective filtration membrane with nanochannels for superior molecular separation. Through complex structural design and material combination, the membrane achieves efficient removal of synthetic dyes and demonstrates excellent molecular separation capability. The results are promising for environmentally friendly and energy-efficient separation of chemicals through membranes in industrial applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Aninamol Ani, P. Poornesh, K. K. Nagaraja, Gopalkrishna Hegde, E. Kolesnikov, Igor Shchetinin, Albin Antony, Suresh D. Kulkarni
Summary: In this study, the role of indium (In) in ZnO thin films for carbon monoxide sensing was investigated using a low-cost spray pyrolysis technique. The results showed that 15 wt% of In in ZnO thin films (IZO) exhibited high response to low concentrations of CO gas at 300 degrees C, attributed to oxygen vacancy defects and smaller grain size.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Review
Engineering, Electrical & Electronic
Rui M. R. Pinto, Ved Gund, Carlos Calaza, K. K. Nagaraja, K. B. Vinayakumar
Summary: This review introduces the wet and dry etching methods for aluminum nitride (AlN) thin-films, and discusses the effects of etching parameters on the overall surface characteristics.
MICROELECTRONIC ENGINEERING
(2022)
Article
Chemistry, Analytical
Anusha, Aninamol Ani, P. Poornesh, Albin Antony, Bhaghyesh, Igor Shchetinin, K. K. Nagaraja, Saikat Chattopadhyay, K. B. Vinayakumar
Summary: Ag-doped WO3 films were fabricated on a soda-lime glass substrate using a simple spray pyrolysis technique. The surface roughness of the films was found to vary within a range through AFM studies. The gas sensing performance of the films with 1% Ag-WO3 showed significant improvement, achieving a detection limit as low as 500 ppb.
Article
Physics, Multidisciplinary
Yu A. Mityagin, P. S. Klemmer, M. P. Telenkov, Ravi Kumar, K. K. Nagaraja
Summary: The study investigates the applicability of resonant tunneling phenomenon for efficient extraction of photogenerated carriers from quantum wells in the electric field of the p-i-n junction. It was found that efficient functioning of the photocarrier extraction mechanism requires resonant tunnel channels for both electrons and holes to be implemented.
BULLETIN OF THE LEBEDEV PHYSICS INSTITUTE
(2022)
Review
Engineering, Electrical & Electronic
Rui M. R. Pinto, Ved Gund, Rosana Alves Dias, K. K. Nagaraja, K. B. Vinayakumar
Summary: This review discusses the applications of aluminum nitride (AlN) in CMOS-integrated MEMS, including comparisons with other common piezoelectric materials, integration strategies, recent demonstrations of AlN-based devices, and other potential applications.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2022)
Article
Nanoscience & Nanotechnology
YuA. Mityagin, M. P. Telenkov, I. A. Bulygina, Ravi Kumar, K. K. Nagaraja
Summary: The kinetics of intersubband relaxation of electronic excitation energy in the GaAs/AlGaAs quantum well is investigated, focusing on the relaxation process when electrons are excited to the upper subband below the optical phonon energy. It is found that the interaction between electrons in different subbands plays a crucial role in the relaxation dynamics, leading to heating of electrons in the upper subbands and accelerated energy relaxation.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Multidisciplinary
Santhosh M. Kumar, Hassan A. H. Alzahrani, G. J. Shankaramurthy, K. K. Nagaraja, Abdulmohsen O. Alsaiari, B. M. Prasanna, N. Chandamma
Summary: In this study, the effect of gamma-irradiation on the structural and AC electrical properties of Ni-Zn nanoparticles was investigated. XRD analysis showed a decrease in crystallite size with increasing Zn2+ ion concentration, and irradiation influenced the crystallite size. The lattice constant increased with Zn2+ concentration, but changes occurred after irradiation. Irradiation also affected the lattice strain and morphology of the samples. In terms of AC electrical properties, irradiation increased the dielectric constant but decreased the dielectric loss and AC conductivity, and the type of dielectric relaxation changed.
Article
Engineering, Electrical & Electronic
Aisha Siddiqa, D. J. Sushmitha, K. K. Nagaraja, D. H. Nagaraju, Mahesh Padaki
Summary: Carbonaceous materials derived from biomass, especially garlic-derived self-heteroatom-doped activated carbon (GAC), have recently gained great significance for supercapacitor application. Among the three prepared samples, GAC-900 exhibited the best performance with a specific capacitance of 341 F/g at 1 A/g and significant pseudocapacitance due to the presence of heteroatoms. The symmetric Swagelok cell GAC-900//GAC-900 achieved remarkable energy density and power density, along with excellent cyclic stability.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
K. A. Vishnumurthy, S. Pramodini, P. Poornesh, K. K. Nagaraja, T. N. Ahipa
Summary: The present paper focuses on the synthesis and characterization of polyindole-ZnO nano composites for third order nonlinear optical applications. Polyindole was synthesized using oxidative polymerization technique and composites were prepared with different ZnO concentrations. The structural morphology of the polymer composite was studied using FESEM, XRD, and UV Visible spectroscopy. The newly prepared thin films showed excellent nonlinear absorption behavior and optical limiting power when exposed to He-Ne laser, making them potential candidates for optical limiting applications.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
R. Bhat. Bhoomika, K. Gurukrishna, N. P. Madhukar, U. Deepika Shanubhogue, Ashok Rao, Ruei-Yu Huang, Yung-Kang Kuo, K. K. Nagaraja
Summary: Here we report a study on compositing highly conductive GdH2 with BiCuSeO to modulate the electronic transport and conductivity at high temperatures. The incorporation of GdH2 as a minor matrix in BiCuSeO significantly improves the electrical conductivity of the system, indicating the presence of thermal activation of charge carriers. The addition of the minor matrix directly converts the p-type conductivity of BiCuSeO to n-type conductivity at near room temperature. Ambiguities in transport behavior at near room temperature are identified by the electronic quality factor (B-E). The power factor is enhanced by GdH2, with a highest attained value of 221 mu W m K-2 at 700 K for the sample with x = 11 wt%, which is nearly twice the value of pristine BiCuSeO. The highest ZT of 0.011 is obtained for the pristine BiCuSeO sample at 380 K.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
N. V. Srihari, Sanjay Nayak, P. Poornesh, K. K. Nagaraja
Summary: This study computationally investigates bismuth ferrite and its various phases using density functional theory with Hubbard correction. The unique properties and exciting phenomena of the material are discovered, along with the exploration of phase transition and mechanical properties. The tetragonal phase is predicted to have a negative Poisson's ratio, making it favorable for growth in compressive environments. The electronic properties and phonon modes of different phases are also explored.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Chemistry, Multidisciplinary
Abhishek Narayanan, Aisha Siddiqa, Nagaraja K. Kodihalli, Gurumurthy Hegde, Doddahalli H. Nagaraju, Mahesh Padaki
Summary: A highly efficient free-standing flexible electrode material was reported for capacitive deionization and supercapacitors. The material exhibited high surface area and high pore volume. The results demonstrated its high specific capacitance and stability in a solid-state supercapacitor device. Overall, this electrode material has bifunctional applications for energy storage and environmental remediation.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Environmental
Prajwal Sherugar, S. Deon, K. K. Nagaraja, Mahesh Padaki
Summary: This study reports an effective method for fabricating iron oxide doped aluminium oxide composite nanoparticles and explores their potential as nanoadditives for enhancing productivity and selectivity. The addition of Fe:Al2O3 nanoparticles was found to increase the porosity of the membranes, and the optimized mixed matrix membrane exhibited excellent rejection efficiency and antifouling ability when treating wastewater containing toxic heavy metal ions.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
