Article
Chemistry, Physical
P. N. Anantharamaiah, H. M. Shashanka, S. Saha, J. A. Chelvane, B. Sahoo
Summary: Bismuth-substituted cobalt ferrite samples with enhanced magnetostriction were successfully synthesized using a glycine-nitrate based auto-combustion route. The presence of Bi3+ promoted significant grain growth and increased strain sensitivity at lower magnetic fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Limin Ren, Moyue Cong, Yifu Fu, Kun Yu, Yisong Tan
Summary: In this study, a wireless and passive magnetostrictive strain sensor with improved sensitivity was proposed, by using a hollow plate with a negative Poisson's ratio structure as the substrate. An analysis model was established and FEM analysis and experiments were conducted to verify and prove the performance of the sensor. The proposed sensor showed advantages of high sensitivity, easy implementation, convenient fabrication, and low cost.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Environmental
Wenyang Tang, Chiyu Fu, Liangjun Xia, Pei Lyu, Lin Li, Zhuan Fu, Heng Pan, Chunhua Zhang, Weilin Xu
Summary: In this study, a fiber-based stretchable strain sensor with a unique three-dimensional (3D) reticular structure was reported for human motion monitoring, displaying high sensitivity and stretchability. The sensor can accurately detect a full range of body motions and subtle signals, and has potential as a Morse code generator for cryptographic communication.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
I. S. B. Ferraz, T. J. Castro, J. Mantilla, J. A. H. Coaquira, V. K. Garg, A. C. Oliveira, A. Franco Jr, P. C. Morais, S. W. da Silva
Summary: Aluminum-substituted cobalt ferrite nanoparticles synthesized by combustion reaction method exhibit excellent structural and property characteristics, making them promising candidates for applications in stress sensors, actuators, and magnetostrictive filters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Paper & Wood
Yu Jiang, Wanqi Feng, Yixiang Chen, Jie Gu, Wei Wang, Dan Yu
Summary: This study successfully prepared conducting hydrogels with ideal wrinkle structure and ultra-high sensitivity by coating silver nanowires on the surface of hydrogels. The conducting hydrogels show great potential for applications in motion detection, gesture recognition, and health monitoring.
Article
Materials Science, Multidisciplinary
K. Venkata Siva, Amritesh Kumar, J. Arout Chelvane, A. Arockiarajan
Summary: This study investigates the magnetostrictive properties of cobalt ferrite by substituting ions. The results demonstrate the significance of doping transition metal ions in enhancing the magnetostrictive characteristics.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Ceramics
M. Satish, H. M. Shashanka, S. Saha, P. N. Anantharamaiah, C. V. Ramana
Summary: This study reports on the enhanced magnetostrictive characteristics of composites derived from hard cobalt ferrite (CFO) and soft nickel ferrite (NFO) materials. The composites were synthesized using a cost-effective and eco-friendly method, and their phase purity, surface morphology, magnetic properties, and magnetostrictive characteristics were evaluated. The composites exhibited better magnetostriction at lower magnetic fields compared to the parent sintered CFO and NFO samples, and their structure-phase-property correlation could provide a roadmap for their potential applications in electromagnetic devices.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Guang Huang, Zhuofu Tang, Shuaiwei Peng, Ping Zhang, Taolin Sun, Wentao Wei, Liangpeng Zeng, Honglei Guo, Hui Guo, Guozhe Meng
Summary: Synthetic hydrogels with hydrophobic interactions have great potential in various industries, but their aggregation of hydrophobic molecules inhibits adhesion to dry materials. This study presents a hybrid hydrogel with ionically and hydrophobically cross-linked networks, showing strong adhesion to various substrates and excellent tensile performance. The observed strong adhesion and high toughness properties are attributed to the synergy of electrostatic interactions and hydrophobic associations, making these hydrogels a model system for exploring the strong adhesion mechanism of hydrophobic hydrogels.
Article
Optics
Rongxuan Zhang, Guwei Zong, Shuangyue Wu, Ruiqi Song, Xu Zhang, Shijun Ge, Wei Hu, Lei Wang, Yanqing Lu
Summary: An ultrathin and flexible metamaterial filter based on one-step CO2 laser-induced graphene technology is introduced for terahertz frequencies. The investigation of laser machining parameters on the conductivity and THz transmittance of the graphene reveals a bandstop filter with approximately 40% transmission at a central frequency of 0.67 THz. The simple and cost-effective fabrication method shows great potential for THz imaging, sensing, and detection.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shuwang Wu, Ta-Wei Wang, Yingjie Du, Bowen Yao, Sidi Duan, Yichen Yan, Mutian Hua, Yousif Alsaid, Xinyuan Zhu, Ximin He
Summary: The use of potassium acetate in polyvinyl alcohol hydrogels improves mechanical properties, anti-freezing capacity, and conductivity, making them suitable for a wide range of conditions.
NPG ASIA MATERIALS
(2022)
Article
Chemistry, Physical
Qing-wen Yuan, Hao-wei Jiang, Tian-yuan Gao, Sen-hao Zhang, Shun-heng Jia, Ting Wu, Jin-ping Qu
Summary: Conductive elastic polymers are promising flexible sensor materials due to their superior mechanical and electrical properties. However, the contradiction between wide detection range and high sensitivity limits their application in wearable electronic devices. This study proposes an effective method combining melt blending and chemical etching to fabricate highly stretchable and ultrasensitive strain sensors. The resulting porous TPU/CNT strain sensor exhibits a wide detection range, ultrahigh sensitivity, low detection limit, and excellent stability and durability. It can be used as an electronic skin to monitor both large movements of joints and subtle movements of the face.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Inorganic & Nuclear
H. M. Shashanka, P. N. Anantharamaiah
Summary: This study investigates the magnetostrictive characteristics of sintered CoFe2O4 (CFO), Co0.85Ni0.15Fe1.85Ga0.15O4 (CNFGO15), and Co0.85Mg0.15Fe1.85Ga0.15O4 (CMFGO15) ceramics. The CMFGO15 sample exhibits enhanced strain sensitivity at low magnetic fields compared to the other two samples, with a maximum strain sensitivity nearly 160% higher than the values found for the other two samples even at remarkable low field.
SOLID STATE SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Xuping Wu, Xuemei Luo, Zhuman Song, Yaoyao Bai, Bin Zhang, Guangping Zhang
Summary: Researchers have developed highly robust and sensitive flexible strain sensors by customizing crack-like patterns and ingeniously modulating low/high-resistance regions on a serpentine meander structure. These sensors demonstrate high cyclic stability, strong tolerance to harsh environments, high gauge factor (>1000) comparable to crack-based sensors, and fast response time (<58 ms). Integrated into a wearable sign language translation system, the sensors enable over 98% recognition rates for the translation of 21 sign languages with the assistance of machine learning. This system facilitates barrier-free communication between signers and nonsigners and has broad application prospects in gesture interaction.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Wang Guijuan, Li Yuanxun, Lu Yongcheng, Chen Daming, Peng Rui
Summary: The study analyzed the effects of replacing Fe3+ with Mg2+ on the structure and magnetic properties of ceramic crystals, synthesized using the traditional solid-phase method CoMgxFe(2-x)O4. Results showed that the lattice constant decreased with increasing Mg2+ content, and Mg2+ influenced both tetrahedral and octahedral positions in the crystal structure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Fan Zhang, Hailong Hu, Simin Hu, Jianling Yue
Summary: This study utilized TiO2 nanowires to enhance the sensitivity of CF/PDMS composite strain sensors, introducing a more porous structure to improve sensitivity and demonstrating significant strain rate dependent behavior.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Chemistry, Physical
Pendaranahalli Nadikeraiah Anantharamaiah, Prerna Rao, Hadonahalli Munegowda Shashanka, Vijay Khopkar, Jeyaramane Arout Chelvane, Balaram Sahoo, C. Ramana
Summary: The tunable dielectric properties of cation-substituted nickel ferrite have been achieved through selective engineering of crystallographic site occupation. The occupation of different sites by Mg2+ and In3+, as confirmed by spectroscopy, leads to variations in dielectric constant and activation energy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Pendaranahalli Nadikeraiah Anantharamaiah, Hadonahalli Munegowda Shashanka, Srikari Srinivasan, Debabrata Das, Ahmed A. El-Gendy, C. V. Ramana
Summary: This study reports on the fabrication, characterization, and evaluation of cobalt ferrite nanocrystalline thin films on a flexible mica substrate. The CFO films exhibited single-phase and nanocrystalline nature, spherical shape morphology, and suitable magnetic and magnetostrictive properties for flexible sensor devices.
Article
Physics, Applied
Sujoy Saha, Sadhan Chanda, Alo Dutta, T. P. Sinha
Summary: We have developed a simple tool to study the insulator-metal transition in RCoO3 (R = Pr, and Nd) nanoparticles prepared using a sol-gel technique. The as-prepared gel is analyzed using thermogravimetric analysis to determine the lowest possible calcination temperature for RCoO3 nanoparticles. The powder X-ray diffraction patterns of the samples crystallize in the orthorhombic (Pnma) phase at room temperature, as confirmed by Rietveld refinement. The particle size is determined using scanning electron microscopy. The ac conductivity of the materials is analyzed over a temperature range of 303 K to 673 K and a frequency range of 42 Hz to 1.1 MHz. The insulator-to-metal transition in PrCoO3 and NdCoO3 is investigated using ac impedance spectroscopy, and the results are cross-checked using DC resistivity measurements.
JOURNAL OF ADVANCED DIELECTRICS
(2023)
Article
Nanoscience & Nanotechnology
Navid Attarzadeh, Debabrata Das, Srija N. Chintalapalle, Susheng Tan, V. Shutthanandan, C. V. Ramana
Summary: In this study, a highly efficient heterostructure catalyst for hydrogen production was designed using a 3D nano architecture inspired by the prickly pear cactus. The catalyst exhibited superior catalytic activity and stability compared to conventional catalysts. The introduction of heterointerfaces and epitaxial NiS nanosheets expanded the active catalytic surface area and enhanced the intrinsic catalytic activity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Sujoy Saha, Ram Prakash Singh, Ashish Rout, Aditya Mishra, Amanat Ali, Himalay Basumatary, Rajeev Ranjan
Summary: There is a growing interest in BiFeO3-based alloys for their potential in developing high-temperature high-performance piezoelectric materials and interesting multiferroic properties. Ceramics synthesized with additives, such as MnO2, exhibit stabilized ferromagnetism caused by the precipitation of trace amounts of ferrimagnetic phases not easily detected by conventional x-ray diffraction measurements. These findings not only provide a strategy for developing magnetoelectric multiferroic composites, but also contribute to a better understanding of the electromechanical response in BiFeO3-based alloys.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
H. M. Shashanka, Sujoy Saha, Keerthi Haritha, P. N. Anantharamaiah, C. V. Ramana
Summary: We report on the influence of Al and Zn co-substitution on the structural, magnetic, and magnetostrictive properties of CZFAO materials. The incorporation of smaller Al3+ ions in spinel ferrite leads to a reduction in crystallite size and lattice parameter. Al-Zn substitution induces grain growth, resulting in a dense, interconnected grain morphology. The magnetic properties of CZFAO, such as saturation magnetization and coercivity, decrease with increasing x due to the non-magnetic character of the substituents.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Crystallography
Vadla Veenachary, Eskilla Venkata Ramana, Simhachalam Narendra Babu, Venkata Sreenivas Puli, Adiraj Srinivas, Gopalan Srinivasan, Sujoy Saha, Guduru Prasad, Nandiraju Venkata Prasad
Summary: In this study, intergrowth of multiferroic compounds Bi4RTi3Fe0.7Co0.3O15-Bi3RTi2Fe0.7Co0.3O12-delta (BRTFCO15-BRTFCO12) (rare earth (R) = Dy, Sm, La) were prepared using solid-state reaction method. The X-ray diffraction Rietveld refinement revealed orthorhombic structure with three-layered and four-layered compounds. Magnetic measurements showed that the Sm-modified intergrowth compound had a larger magnetization compared to Dy- and La-doped ones. The higher magnetization can be attributed to distortion in the unit cell, bonding of Fe3+-O-Co3+, and possible mixture of FexCoy-type nanoparticles formed during synthesis of intergrowths. The results demonstrate that the RE-modified intergrowth method is an effective approach for preparing higher-layer Aurivillius multiferroic ceramics.
Article
Chemistry, Multidisciplinary
Debabrata Das, Guillermo Gutierrez, C. V. Ramana
Summary: Using Raman scattering analyses, this study investigates the effect of Sn incorporation on the crystal structure, chemical bonding, and phase formation of Ga2O3 compounds. The results show that Sn-induced changes in chemical bonding and phase segregation are significant. The study also reveals the evolution of Sn-O bonds with increasing Sn concentration.
Article
Materials Science, Ceramics
M. Satish, H. M. Shashanka, S. Saha, P. N. Anantharamaiah, C. V. Ramana
Summary: This study reports on the enhanced magnetostrictive characteristics of composites derived from hard cobalt ferrite (CFO) and soft nickel ferrite (NFO) materials. The composites were synthesized using a cost-effective and eco-friendly method, and their phase purity, surface morphology, magnetic properties, and magnetostrictive characteristics were evaluated. The composites exhibited better magnetostriction at lower magnetic fields compared to the parent sintered CFO and NFO samples, and their structure-phase-property correlation could provide a roadmap for their potential applications in electromagnetic devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
S. Kalpana, Vinay S. Bhat, G. Hegde, T. Niranjana Prabhu, P. N. Anantharamaiah
Summary: Two synthesis methods, autocombustion and sol-gel, were used to produce nearly spherical and polygonal shaped nanomaterials of spinel cobalt oxide as electrode materials. Analysis revealed different particle morphologies and crystallite sizes for the two samples, as well as variations in surface area and specific capacitance. Autocombustion method exhibited superior energy storage capability and higher surface area compared to sol-gel method.
Article
Engineering, Electrical & Electronic
Paul Gaurav Nalam, Debabrata Das, Susheng Tan, Chintalapalle Ramana
Summary: This study demonstrates the successful synthesis of two polymorphs of germanium oxide, hexagonal and tetragonal phases, with exceptional optical behavior. However, the complexity in synthesizing the desired phase and controlling its properties remains a major challenge in applications.
ACS APPLIED ELECTRONIC MATERIALS
(2022)