Article
Polymer Science
Kartheek Pilla, Manoj Neergat, Krishna Nagasai Jonnalagadda
Summary: The aim of this study is to understand the correlation between phase and mechanical behavior of beta-PVDF obtained directly from spin-coating and its stretch-induced transformation from alpha-PVDF. The mechanical properties of spin-coated PVDF freestanding thin films under thermal annealing and in-plane anisotropy are investigated. The mechanical strength and failure strain of spin-coated and annealed alpha-PVDF are much higher than spin-coated beta-PVDF.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
X-Y Wei, O. Alves Santos, C. H. Sumba Lusero, G. E. W. Bauer, J. Ben Youssef, B. J. van Wees
Summary: This study reports a giant magnon conductivity in thin yttrium iron garnet films. By reducing the number of occupied two-dimensional subbands from a large number to a few, a transition from three-dimensional to two-dimensional magnon transport is achieved. The high conductivity obtained offers opportunities for developing low-dissipation magnon-based spintronic devices.
Article
Materials Science, Multidisciplinary
Paulo H. E. Falsetti, Fernando C. Soares, Gabriel N. Rodrigues, Douglas M. S. Del Duque, Wlademir R. de Oliveira, Bruno F. Gianelli, Vagner R. de Mendonca
Summary: This study successfully deposited Bi2O3 thin films by spin-coating and applied them as photocatalysts for dye photodegradation under UV radiation, showing high efficiency and stability of the thin films as a photocatalyst.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Amal Aldarawsheh, Moritz Sallermann, Muayad Abusaa, Samir Lounis
Summary: Topological antiferromagnetism is a vibrant research field aiming to identify topologically protected magnetic states. This study predicts new chiral particles, exchange-frustrated multimeronic spin textures, hosted by a Ne'el magnetic state in single AFM materials. These structures have distinct topological charges and enhanced stability against external magnetic fields.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Lalminthang Kipgen, Matthias Bernien, Felix Tuczek, Wolfgang Kuch
Summary: This article summarizes the research on spin-crossover molecules on solid surfaces in molecular spintronics, covering a range from single molecules to ultrathin films, mainly in the sub-10 nm range. The achievements, challenges, and prospects in this field are highlighted.
ADVANCED MATERIALS
(2021)
Article
Instruments & Instrumentation
Aidan H. Coffey, Jonathan Slack, Earl Cornell, Lee L. Yang, Kevan Anderson, Kang Wang, Letian Dou, Chenhui Zhu
Summary: In this study, a custom-made, in situ, multimodal spin coater system with an integrated heating stage is presented. This system allows for true multimodal characterization and correlated data analysis by combining spinning and heating recipes with synchrotron-based, grazing-incidence wide- and small-angle x-ray scattering. The system enables monitoring of structural evolutions such as perovskite crystallization and polymer self-assembly across a broad length scale with millisecond temporal resolution, providing insights for thin film manufacturing.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Multidisciplinary
Wenhao Zhang, Zhi-Mo Zhang, Jin-Hua Nie, Ben-Chao Gong, Min Cai, Kai Liu, Zhong-Yi Lu, Ying-Shuang Fu
Summary: Unraveling the magnetic order in iron chalcogenides and pnictides at atomic scale is experimentally challenging but crucial for understanding their unconventional superconducting pairing mechanism. This study successfully resolves real-space spin contrasts in Fe4Se5 ultrathin films, revealing atomically unidirectional stripes. These measurements provide valuable insights into the emergent magnetic order and the electronic phase diagram for FeSe-derived superconductors.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
V. V. Tikhonov, V. A. Gubanov, S. A. Nikitov, A. V. Sadovnikov
Summary: A method of nondestructive control of the layered structure of submicron ferrite films was proposed based on spin-wave resonance frequencies. Inhomogeneity of magnetization in the transition layer enables the phase synchronism of electromagnetic waves and exchange spin waves. Coupled waves hybridization leads to the excitation of hybrid quasi-spin and quasi-electromagnetic waves in the film.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Instruments & Instrumentation
Lisa Sarkar, Shiv Govind Singh, Siva Rama Krishna Vanjari
Summary: This study demonstrates the optimization process of PVDF thin films to utilize their piezoelectric properties for miniaturized sensor and actuator applications. The research thoroughly investigates the material and piezoelectric properties of PVDF thin films, and successfully fabricates a thin film with superior piezoelectric response.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Matthias Pickem, Josef Kaufmann, Karsten Held, Jan M. Tomczak
Summary: The research revealed that in ultra-thin metallic transition-metal oxide films, a metal-to-insulator transition occurs when the thickness is only a few unit cells thick. By simulating the deposition of a monolayer of strontium vanadate on a strontium titanate substrate, the researchers found that different phase diagrams emerge upon doping or applying a gate voltage. This highlights the rich properties driven by interface and surface reconstruction in ultra-thin films, which are drastically different from the bulk physics of the material.
Article
Materials Science, Multidisciplinary
Bhuvash Jolly, Wahdat Ullah, Namrata Saxena, Ritu Sharma, Vijay Janyani
Summary: This study investigates the microstructural evolutions and optical properties of semi-crystalline PVDF films deposited on glass substrates with different PVDF content and spin coating speeds. Various analytical techniques including FE-SEM, AFM, FTIR spectrometer, and UV-vis spectrometer were used to characterize the films.
Article
Physics, Condensed Matter
Z. R. Khan, Abdullah S. Alshammari, Mansour Mohamed, Mohd Shkir
Summary: The impact of solute concentration on the structural, optical, and nonlinear optical properties of PbI2 nanostructured thin films was studied, showing promise for optoelectronics applications.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
S. Anand, S. Pauline
Summary: This study developed a simple and cost-effective method to fabricate PVDF-based composites with high EMI shielding performance, showing promising prospects for application in the construction, electronics, and aerospace fields. The composite films exhibited enhanced absorption and a high EMI shielding effectiveness of 25.63 dB, with an absorption-dominated shielding feature in the 8-12 GHz region, attributed to the beta-phase fraction induced electrostatic interaction and synergetic effect of rGO and Ba2Co2Fe12O22 NPs.
Article
Polymer Science
Luyang Li, Xiangmeng Jia, Qingshu Dong, Jiajia Zhou, Weihua Li
Summary: The self-assembly behavior of symmetric diblock copolymers was investigated using self-consistent field theory and dissipative particle dynamics. It was found that the hexagonal dot pattern observed in thin films is an equilibrium morphology that requires ultrathin thickness and asymmetric surface affinities.
Article
Chemistry, Physical
Yuanjie Shu, Liaoliang Ke, Jie Su, Fei Shen
Summary: This experimental study focused on the fretting wear behavior of PVDF piezoelectric thin film against a Si3N4 ceramic sphere under air conditions. Results indicated that creep and plastic deformation led to noticeable wrinkles on the contact surface of the PVDF thin film, which could decrease its specific wear rate.
Article
Chemistry, Analytical
D. Manjula Dhevi, A. Anand Prabu, Kap Jin Kim
VIBRATIONAL SPECTROSCOPY
(2018)
Article
Materials Science, Textiles
Mohammad Shamim Reza, Kevin Ray Ayag, Mi Kyong Yoo, Kap Jin Kim, Hongdoo Kim
FIBERS AND POLYMERS
(2019)
Article
Polymer Science
Ponnan Sathiyanathan, Dhevagoti Manjula Dhevi, Arun Anand Prabu, Kap Jin Kim
MACROMOLECULAR RESEARCH
(2019)
Article
Engineering, Electrical & Electronic
You Jeong Jeong, Young Eun Kim, Kap Jin Kim, Eung Je Woo, Tong In Oh
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2020)
Article
Materials Science, Textiles
Hang-Won Cho, Hyun-Jin Koo, Hongdoo Kim, Kap-Jin Kim
FIBERS AND POLYMERS
(2020)
Article
Materials Science, Textiles
Mohammad Shamim Reza, Kap Jin Kim, Hongdoo Kim
FIBERS AND POLYMERS
(2020)
Article
Polymer Science
Shamim-Ara Pervin, Ponnan Sathiyanathan, Arun Anand Prabu, Kap Jin Kim
Summary: Electrospun PVDF/sPPS blend nanofiber webs were prepared to investigate the changes in piezoelectric behavior of PVDF with varying sPPS content. The results showed that the addition of sPPS significantly increased the beta-crystalline absorbance of PVDF, improving the performance of the piezoelectric sensor.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ponnan Sathiyanathan, Lixin Wu, Thomas Walter Schmidt, Tianyuan Li, Gunasekaran Harini Bhuvaneswari, Hongdoo Kim, Arun Anand Prabu, Kap Jin Kim
Summary: This study investigated the changes in beta-crystalline phase in nanofibers using varying content of sulfonated Poly(phenylidene sulfide) as a filler. Among the different samples, the 5 wt.-% sulfonated Poly(phenylidene sulfide) content exhibited the maximum increase in beta-crystallinity, showing a nucleating effect in the nanofibers.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Textiles
Mir Muhammad Fahad, Mohammad Shamim Reza, Gajula Prasad, Sellamuthu N. Jaisankar, Kap Jin Kim, Hongdoo Kim
Summary: In this research, triboelectric sensors were fabricated using different materials, and the results showed that nonwoven TPU generated larger triboelectric voltages compared to electrospun TPU nanoweb, possibly due to its higher roughness. The sensors were also able to accurately measure physiological vital signs and movements of a human, such as heartbeat and respiration, and detect apneic events and body movements.
FIBERS AND POLYMERS
(2022)
Article
Materials Science, Textiles
Shamim-Ara Pervin, Arun Anand Prabu, Kap Jin Kim
Summary: Soluble sulfonated poly(1,4-phenylene sulfide) (sPPS) was synthesized and characterized using various methods. Melt-polymerized PPS samples were found to have approximately twice the degree of branching compared to solution-polymerized PPS samples.
FIBERS AND POLYMERS
(2022)
Article
Engineering, Electrical & Electronic
Prasad Gajula, Fahad Mir Muhammad, Mohammad Shamim Reza, Sellamuthu N. Jaisankar, Kap Jin Kim, Hongdoo Kim
Summary: Nowadays, flexible triboelectric sensors are the most promising candidates for wearable energy harvesting and medical applications. Self-powered flexible triboelectric sensors (SF-TESs) were fabricated using roughness-created Ecoflex cast film and melt-blown nonwoven polyurethane layers. By adding a spacer, the SF-TES showed improved triboelectric performance with higher VOC and power density values.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Analytical
Mohammad Shamim Reza, Lu Jin, You Jeong Jeong, Tong In Oh, Hongdoo Kim, Kap Jin Kim
Summary: This study aims to find suitable base materials for dry electrode fabrication in order to achieve high accuracy and maintain electrode performance for long-term bioelectric potential monitoring after electroless silver plating. Nanoweb-based chlorinated polyisoprene (CPI) and poly(styrene-b-butadiene-b-styrene) (SBS) rubber were selected as promising candidates due to their excellent elastic properties and nanofibril nature. The electroless silver plating technique was used to coat the nanofiber web, resulting in the fabrication of silver nanoweb (AgNW)-based dry electrodes. Thorough investigations were conducted to evaluate the key electrode properties of AgNW dry electrodes, and human testing showed comparable performance to commercial Ag/AgCl gel electrodes, with superior long-term stability.
Article
Engineering, Electrical & Electronic
Lu Jin, Zhenhong Li, Zekun Liu, Bethany Richardson, Yan Zheng, Lulu Xu, Zhongda Chen, Heng Zhai, Hongdoo Kim, Qingwen Song, Pengfei Yue, Sheng Quan Xie, Kap Jin Kim, Yi Li
Summary: This paper introduces a novel strategy involving unimodal tension, bend, shear, and twist strain sensors for detecting and differentiating individual strain modes in complex motions, potentially revolutionizing the development of motion recognition and control systems.
NPJ FLEXIBLE ELECTRONICS
(2022)
