Article
Polymer Science
Weikai Sun, Minhao Yang, Kun Peng, Yaqin Fu
Summary: The demand for high-speed communication at high frequency has led to the development of low-dielectric polymer films. Aromatic polyimide (PI) is commonly used in flexible circuit boards due to its excellent properties, but its dielectric constant is relatively high for high-frequency communication. To address this, a hyper-crosslinked polymer (HCP) was synthesized and blended with PI to form all-organic HCP/PI composite films. The porous structure of HCP helps to reduce the dielectric constant of the PI matrix. By adjusting the HCP content, the dielectric constant of the composite films can be effectively lowered in the desired frequency range. This method is simple and can be applied to other organic component-filled PI systems.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Hejian Li, Xiangyi Kong, Shixiao Wang, Min Gong, Xiang Lin, Liang Zhang, Dongrui Wang
Summary: In this study, a series of recyclable porous dielectric films with varying porosities were fabricated using a synthesized soluble fluorinated polyimide through nonsolvent-induced phase separation. The shape, size, and size distribution of the pores generated in the polyimide matrix can be accurately regulated by manipulating the mass ratio of the binary solvent. These porous polyimide films with adjustable dielectric constant and electrical breakdown strength, superior thermal stability, mechanical characteristics, and recyclability are highly promising for constructing high-frequency microelectronic devices.
Article
Materials Science, Multidisciplinary
Yoonsoo Park, Hyuna Lim, Sungyool Kwon, Wonjin Ban, Seonhee Jang, Donggeun Jung
Summary: In this study, copolymerized SiCOH films were successfully deposited using plasma-enhanced chemical vapor deposition, with the flow rate ratio significantly affecting the chemical structure and material performance. The films showed excellent mechanical and electrical properties, making them promising for application as IMD materials in semiconductor devices.
Article
Materials Science, Composites
Lingling Wang, Chenchen Liu, Zhongxiang Bai, Yumin Huang, Xiaobo Liu
Summary: By adjusting the pore size through the in situ generation of ZIF-8 in ZIF-8/PEN films, the dielectric constant can be significantly reduced, and water resistance and mechanical properties can be enhanced. The films exhibit superior elongation at break and outstanding flexibility.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shengliao Yan, Zhuo Chen, Yang Zhang, Yuping Yang, Yufeng Xiong, Lijie Dong
Summary: A new type of flexible polymer dielectric film was prepared by mixing f-PPTA and PVDF, which achieved a high energy-storage density and charge-discharge efficiency.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Liang Cao, Yi Zheng, Qi Xue, Ziyan Wen, Liping Chen, Yiqin Huang, Tao Hang, Yunwen Wu, Ming Li
Summary: In this study, porous PMMA films with lower dielectric constants were successfully prepared on a porous silicon surface using a chemical grafting method. Compared with traditional methods, these films exhibited better performance and have potential applications in the field of high-frequency communication.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Polymer Science
Jiabei Zhou, Xianzhu Zhong, Aniruddha Nag, Yang Liu, Kenji Takada, Tatsuo Kaneko
Summary: Porous polybenzimidazole derivative films were prepared using a silica template method, resulting in ultrahigh thermoresistant films with improved elongation properties and enhanced strength and hardness. Microscopic analysis confirmed the formation of pores and observed craters with swollen edges and hardened surfaces.
Article
Materials Science, Multidisciplinary
Birthe Zandersons, Lukas Luhrs, Yong Li, Joerg Weissmueller
Summary: Nanoporous gold (NPG) made by dealloying exhibits mechanical behavior strongly influenced by ligament size and solid volume fraction. Stiffness and strength of the material show a better correlation to the gold atom fraction x(Au)(0) compared to the solid volume fraction phi. Spontaneous plastic deformation events during dealloying may lead to macroscopic shrinkage, decoupling phi from x(Au)(0).
Article
Polymer Science
Tong Cao, Lingling Wang, Guo Lin, Yanjie An, Xiaobo Liu, Yumin Huang
Summary: In this study, a novel polymer material PEN was designed and synthesized, which showed ultralow dielectric constant and excellent mechanical properties due to the introduction of low polarizability trifluoromethyl group and porous structures.
Article
Nanoscience & Nanotechnology
Nicola Manca, Gaia Tarsi, Alexei Kalaboukhov, Francesco Bisio, Federico Caglieris, Floriana Lombardi, Daniele Marre, Luca Pellegrino
Summary: In this study, suspended micro-mechanical structures were successfully fabricated from nanometer-thick ETO films, and their mechanical properties were characterized. Temperature-dependent measurements revealed a non-monotonic and hysteretic mechanical response in the ETO films. Additionally, the influence of oxygen vacancies on the mechanical properties was investigated by comparing stoichiometric and oxygen-deficient samples.
Article
Materials Science, Multidisciplinary
H. Joshi, Tuan V. Vu, Nguyen N. Hieu, R. Khenata, D. P. Rai
Summary: An ab-initio density functional theory (DFT) method was utilized to investigate the elastic and thermodynamic properties of Fe2CoAl under hydrostatic pressure. It was found that the compound exhibits a mixture of covalent and ionic bonds, and shows ductility at all pressures considered, with various mechanical and dynamical properties showing linear changes under different applied pressures.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Polymer Science
Jie Mao, Jing Li, Wang Lin, Faliang Luo
Summary: This work presents a method for preparing a homogeneous polybutadiene dielectric elastomer with improved actuated strain using a photochemical thiol-ene click reaction. Different grafting groups are used on the polybutadiene, and the influence of polarity and hydrogen bonding effect on the dielectric and mechanical properties is discussed. The modified polybutadiene with butyl acrylate groups shows high dielectric constant, low dielectric loss, and large actuated strain.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Jingjing Meng, Hao Guan, Chunyu Li, Zhiyong Li, Zheng Fang, Kai Guo
Summary: The conversion of 5-hydroxymethylfurfural, honokiol, and magnolol into sustainable epoxy monomers leads to the synthesis of novel interpenetrating polymer networks (IPN) using 3,3'-diamino diphenylsulfone (33DDS) or 4,4'-diamino diphenylsulfone (44DDS) as curing agents. The twist-stacked structure induced by 33DDS provides excellent mechanical properties and high phase transition temperature, while the planar weave matrix formed with 44DDS exhibits superior thermal and electrical properties. Furthermore, the biobased epoxy resin wastes can be reclaimed through both aerobic and anaerobic pyrolysis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Yu Fu, Wenlong Xiao, Junshuai Wang, Lei Ren, Xinqing Zhao, Chaoli Ma
Summary: A novel strategy for developing alpha + beta dual-phase titanium alloys with low Young's modulus and high yield strength was proposed in this study, and an alloy was successfully developed through theoretical composition design and microstructure manipulation. The experimental results confirm that the developed alloy exhibits both low Young's modulus and high yield strength, indicating the potential for advanced biomedical titanium alloys with superior properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Crystallography
Panpan Zhang, Lize Zhang, Ke Zhang, Jiupeng Zhao, Yao Li
Summary: This study successfully prepared porous polyimide film with relatively low dielectric constant using fluorinated graphene/polyamic acids as precursors. The overall dielectric performance of the porous film was best at 0.5wt% fluorinated graphene content. However, the mechanical properties of the film were relatively poor and need further improvement.
Article
Materials Science, Multidisciplinary
Mengjiao Dong, Liyun Liao, Chensheng Li, Yingxiao Mu, Yanping Huo, Zhong-Min Su, Fushun Liang
Summary: This study investigates the influence of the polarity of polymer matrices on persistent room-temperature phosphorescence (pRTP). It is discovered that intense phosphorescence emission can be achieved in highly polar matrices such as polyacrylic acid (PAA). The dipole-dipole interaction between the polar fluorophore and polar matrix is proposed to stabilize the excited state and facilitate the generation of efficient room-temperature phosphorescence emissions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Han-Jiang Yang, Weijia Xiang, Xiangzhou Zhang, Jin-Yun Wang, Liang-Jin Xu, Zhong-Ning Chen
Summary: This article reports a 2D copper(I)-based cluster material for X-ray imaging, which exhibits ultra-high spatial resolution, high photoluminescence efficiency, and low detection limit. The material shows excellent linear response to X-ray dose rates and light output, and has the best spatial resolution among reported lead-free metal halide hybrids.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Review
Materials Science, Multidisciplinary
Taek Joon Kim, Sang-hun Lee, Dayeong Kwon, Jinsoo Joo
Summary: Donor-acceptor heterostructures using organic-inorganic halide perovskites, two-dimensional transition metal dichalcogenides, pi-conjugated organic small/macro molecules, and quantum dots are promising platforms for exciton-based photonics and optoelectronics. Hetero-interlayer excitons and hetero-intermolecular excitons formed through optical and/or electrical charge transfer in various heterostructures are important quasi-particles for light emission, detection, and harvesting systems.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Liemao Cao, Xiaohui Deng, Zhen-kun Tang, Rui Tan, Yee Sin Ang
Summary: We investigate the interface properties between WSi2N4 and Mo2B, O-modified Mo2B, and OH-modified Mo2B nanosheets. We find that WSi2N4 and Mo2B form n-type Schottky contacts, while functionalizing Mo2B with O and OH leads to the formation of both n-type and p-type ohmic contacts with WSi2N4. Additionally, we demonstrate the emergence of quasi-ohmic contact with ultralow lateral Schottky barrier and zero vertical interfacial tunneling barriers in Mo2B(OH)2-contacted WSi2N4.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ga Eun Kim, Hae-Jin Kim, Heesuk Jung, Minwoo Park
Summary: This study presents a solution to the commercialization challenges of flexible LEDs based on MAPbBr(3) by incorporating polyurethane and an In-Ga-Zn-Sn liquid alloy. The designed devices showed high flexibility, efficiency, and durability, with improved electron injection and reduced defects, making them promising for next-generation displays.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tao Shen, Zeng Wu, Zhen Jiang, Dongsheng Yan, Yan Zhao, Yang Wang, Yunqi Liu
Summary: Sidechain engineering is an important molecular design strategy for tuning the solid-state packing and structural ordering of conjugated polymers. The effects of sidechain direction on the optoelectronic properties of polymers and device performance were systematically investigated in this study. The results demonstrate that tuning the sidechain substitution direction can effectively improve the molecular structure and light absorption properties of polymers, providing new insights for the rational design of functional polymers.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Lotte Clinckemalie, Bapi Pradhan, Roel Vanden Brande, Heng Zhang, Jonathan Vandenwijngaerden, Rafikul Ali Saha, Giacomo Romolini, Li Sun, Dirk Vandenbroucke, Mischa Bonn, Hai I. Wang, Elke Debroye
Summary: In this study, a facile strategy using a non-conductive polymer was proposed to fabricate stable, pinhole-free thick films. The effect of introducing a second phase into CsPbBr3 perovskite crystals on their photophysical properties and charge transport was investigated. The dual phase devices exhibited improved stability and more effective operation at higher voltages in X-ray detection.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jingye Zou, Shenglan Hao, Pascale Gemeiner, Nicolas Guiblin, Omar Ibder, Brahim Dkhil, Charles Paillard
Summary: When rare-earth ions are embedded in a ferroelectric material, their photoluminescence can serve as an all-optical probe for temperature, electric field, and mechanical stimulus. However, the impact of ferroelectric phase transitions on photoluminescence is not well understood. In this study, we demonstrate changes in the photoluminescence of green emission bands during critical ferroelectric transitions in an Er-doped BaTiO3 material. We also find that the intensity ratio and wavelength position difference of sub-peaks provide information on the phase transitions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jiangchao Han, Daming Zhou, Wei Yang, Chen Lv, Xinhe Wang, Guodong Wei, Weisheng Zhao, Xiaoyang Lin, Shengbo Sang
Summary: Rare type-II spin-gapless semiconductors (SGSs) have attracted increasing attention due to their unique spin properties. In this study, the interface contacts and spin transport properties of different devices composed of VSi2P4 ferromagnetic layers were investigated. The results show that VSi2P4 is a promising material for designing vertical van der Waals heterostructures with a giant tunnel magnetoresistance (TMR) in spintronic applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tianqi Zhao, Renagul Abdurahman, Qianting Yang, Ruxiangul Aiwaili, Xue-Bo Yin
Summary: In this study, we designed and prepared Cr and Ba-doped gamma-Ga2O3 nanoparticles to achieve near-infrared emission and enhance the emission intensity. The emission mechanism was proposed based on the trap depth, band gap, and energy levels of Cr ions. The ratiometric temperature sensing and encryption information transfer demonstrated the potential applications of this technology.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Jyotirmoy Sau, Manoranjan Kumar, Chandan Mazumdar
Summary: In this study, a new spin-gapless semiconductor material CoFeMnSn is reported, and its stable structure and spin-polarized band structure are determined through experimental realization and theoretical calculations. The compound exhibits a high ferromagnetic transition temperature, making it excellent for room temperature applications. The nearly temperature-independent resistivity, conductivity, and carrier concentration of the compound, adherence to the Slater-Pauling rule, and the high intrinsic anomalous Hall conductivity achieved through hole doping further confirm its spin-gapless semiconductor nature. Additionally, the compound's SGS and topological properties make it suitable for spintronics and magneto-electronics devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ikumi Aratani, Yoji Horii, Yoshinori Kotani, Hitoshi Osawa, Hajime Tanida, Toshiaki Ina, Takeshi Watanabe, Yohko F. Yano, Akane Mizoguchi, Daisuke Takajo, Takashi Kajiwara
Summary: In this study, two-dimensional arrays of single-molecule magnets (SMMs) based on metal-organic frameworks (MOFs) were systematically modified through Langmuir-Blodgett methods and chemical modifications. The introduction of bulky alkoxide groups induced structural changes and perpendicular magnetic anisotropy. This research provides a promising strategy for the construction of high-density magnetic memory devices using molecular spintronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Zonghao Lei, Houhe Dong, Lijie Sun, Bing Teng, Yanfei Zou, Degao Zhong
Summary: Researchers have successfully developed four different up-conversion phosphors based on the Eulytite-type host Ba3Yb(PO4)(3). The optical temperature sensing properties of these phosphors were thoroughly investigated, and it was found that Ba3Yb(PO4)(3):Tm/Er/Ho showed potential for optical temperature measurement applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
C. Roncero-Barrero, M. A. Carvajal, J. Ribas-Arino, I. de P. R. Moreira, M. Deumal
Summary: This study computationally investigates the conductivity of four isostructural compounds with different Se contents, and reveals the parameters that define their conductivity in stable organic radical materials. The results provide insights into the influence of Se content on the conductivity and highlight the importance of considering multiple parameters in understanding the trends in conductivity.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Remi Arras, Kedar Sharma, Lionel Calmels
Summary: In this study, we investigated the interplay between structural defects in NiFe2O4, showing that the complex formed by a Ni-Oh/Fe-Td-cation swap and a neutral oxygen vacancy is more stable than these two isolated defects, and significantly reduces the width of the minority-spin band gap.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)