Article
Chemistry, Physical
Jiangtao Fan, Zhen Long, Haitao Zhou, Gang He, Zhanggui Hu
Summary: (Tm+Nb) co-doped TiO2 ceramics were prepared and their phase, microstructure, and dielectric properties were investigated. The ceramics with a co-doping concentration of 0.01 exhibited ultralow dielectric loss and colossal permittivity, showing excellent temperature and frequency stability in a certain range. The dielectric properties of the ceramics were influenced by several factors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yuechan Song, Peng Liu, Wenwen Wu, Quan Zhou
Summary: Al0.15Nb0.15Ti0.7O2 ceramics were synthesized via strong magnetic field alignment at 6 T and sintered under a nitrogen atmosphere. A ceramic prepared at 6 T by polishing it along the direction parallel to the magnetic field (parallel-6 T) with a brick-layered microstructure shows a colossal permittivity of ?r ?8.2 ? 104 and a low dielectric loss of tan ? ?0.019 at 1 kHz, with impedance spectroscopy suggesting that the colossal permittivity is attributed to internal barrier layer capacitor effects. XRD results indicate that approximately 90 % of the grains are aligned along the magnetic field with a tilt angle less than 10?. The average width and length of the grains for parallel-6 T ceramics are 4.1 ?m and 9.4 ?m. Compared to non-magnetically treated Al0.15Nb0.15Ti0.7O2 ceramics, the high grain boundary resistance (1.6 ? 108 ? cm) of the parallel-6 T ceramic can be responsible for this low dielectric loss.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Ku Noor Dhaniah Ku Muhsen, Rozana Aina Maulat Osman, Mohd Sobri Idris
Summary: This study investigates the dielectric behavior and microstructural analysis of (Nb, La) co-doped TiO2 ceramic. The presence of secondary phase LaNbTiO6 affects the properties of the ceramic, and different materials and sintering temperatures lead to different results.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Biochemistry & Molecular Biology
Theeranuch Nachaithong, Narong Chanlek, Pairot Moontragoon, Prasit Thongbai
Summary: (Co, Nb) co-doped rutile TiO2 nanoparticles were prepared with low dopant concentrations, exhibiting high dielectric permittivity and low loss tangent. Impedance spectroscopy revealed that the ceramics are electrically heterogeneous, with interfacial polarization at internal insulating layers contributing to the low loss tangent.
Article
Materials Science, Ceramics
Jingxuan Li, Yu Zeng, Yihang Fang, Nan Chen, Guoping Du, Aisheng Zhang
Summary: In this study, nanometer-sized rutile (La + Nb) co-doped TiO2 powders were synthesized using a sol-gel method to prepare ceramics with grain sizes less than 200 nm. The effect of co-doping concentration on microstructures and dielectric properties was investigated, with a 2% co-doping concentration showing high dielectric permittivity and low dielectric loss. The electron hopping and electron-pinned defect-dipole effect were considered as the main reasons for the excellent dielectric properties observed in the co-doped TiO2 ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Lingxia Li, Jialing Xie, Menglong Wang, Kai Zhang
Summary: The study investigates the performance of Mg and Nb co-doping BaTiO3 ceramics, and suggests that appropriate MgO doping can enhance grain boundary resistance and improve dielectric properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Lin Zhou, Mingjia Jiang, Yaqiong Sun, Dong Yang, Jinhua Xu, Zhanhui Peng, Di Wu, Lingling Wei, Pengfei Liang, Xiaolian Chao, Zupei Yang
Summary: In this study, various (Cu0.5W0.5)xTi1-xO2 (CWTOx) ceramics were fabricated by a traditional solid reaction method, showing a high permittivity (epsilon r>104), low dielectric loss (tan delta < 0.1), and good temperature stability within a broad frequency/temperature range for CWTO0.015 ceramic, which meets the application requirement of X8R. Abnormal dielectric relaxation phenomena at low and high temperature regions were explained by interface polarization and ionization of oxygen vacancies, respectively, and the CP performance of CWTOx ceramics was predominantly influenced by the interface barrier layer capacitance effect according to complex impedance, XPS, and EPR results. This finding is expected to promote the further development and application of CP materials.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Lichen Luo, Jinglei Li, Mingwen Wang, Shuai Yang, Jie Wu, Xiangyu Gao, Chunchun Li, Wenya Du, Lin Zhang, Fei Li
Summary: In this study, Nb-doped SrTiO3 ceramics were prepared and found to exhibit high dielectric permittivity and low dielectric loss. XRD analysis indicated a high purity with no secondary phase. XPS experiments confirmed the influence of Nb doping on the high dielectric performance.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Longhai Yang, Wenjie Gao, Jiaxing Wang, Chunxiang He, Gaili Yue, Tao Zhang
Summary: Li-doped Bi2/3Cu3Ti4O12 ceramics were successfully prepared, and the effect of Li doping on the crystal structure and dielectric properties was investigated. Li doping improved the dielectric constant and reduced the dielectric loss in the mid-frequency range. The dielectric response at different frequencies was found to originate from different regions within the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Lei Wang, Xudong Liu, Mu Zhang, Xiaoguo Bi, Zhixin Ma, Jinsheng Li, Jialin Chen, Xudong Sun
Summary: (Nb0.5Ga0.5)(x)Ti1-xO2 single crystals with different doping amounts were prepared by Verneuil method. The crystals showed varying dielectric performance, with the best dielectric properties achieved at a doping amount of 0.5%. The colossal permittivity properties were attributed to EPDD polarization, and higher doping concentrations led to slight increases in dielectric loss. The results highlight the significance of TiO2 crystal materials with lower dielectric loss for the development of dielectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Lin Zhou, Zhanhui Peng, Jie Zhu, Qiangqiang Shi, Pengfei Liang, Lingling Wei, Di Wu, Xiaolian Chao, Zupei Yang
Summary: Dense (Ag2/5Mo3/5)(x)Ti1-xO2 ceramics (AMTOx) with good dielectric properties and superior temperature stability were successfully prepared. The AMTO(0)(.0125) ceramics exhibited a giant permittivity and met the application temperature requirement of Z9R capacitor. Different dielectric relaxation behaviors at low and high temperatures were explained by the interface polarization and ionization or displacement of oxygen vacancies, respectively.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Shota Kakimoto, Yujiro Hashimoto, Taro Kuwano, Koji Kimura, Kouichi Hayashi, Manabu Hagiwara, Kazuhiko Deguchi, Hiroki Taniguchi
Summary: Co-doping of heterovalent ions to rutile-type TiO2 has been studied to design high-permittivity materials with local structure engineering. However, the role of co-dopants in permittivity enhancement is still unclear. Dielectric measurements were performed on Nb + X (X = Al, Ga, In) co-doped and Nb-doped TiO2 single crystals before and after annealing to investigate the effects of co-dopants. The results suggest that the huge permittivity observed in the as-grown samples is due to thermally excited carriers, while the post-annealed samples show recovery of the insulating property through migration of X cations into the single crystal.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jiangtao Fan, Yimeng Chen, Zhen Long, Liping Tong, Gang He, Zhanggui Hu
Summary: In this work, Tm + Ta co-doped TiO2 ceramics with ultrahigh permittivity and very low loss were prepared using a solid-state reaction method. The high dielectric constant and low dielectric loss were attributed to the electron pinned defect dipole response formed by the coupling of Ti3+ and oxygen vacancies. The impedance analysis and frequency dependent dielectric constant under a DC bias suggested that the internal barrier layer capacitance response and electrode response also contribute significantly to the dielectric constant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhentao Wang, Liang Zhang, Juan Liu, Zhi Jiang, Lei Zhang, Yongtao Jiu, Bin Tang, Dong Xu
Summary: With the continuous development of electronic technology, the application of colossal permittivity materials is becoming more and more important. In this study, (Sr1/3Sb2/3)( x )Ti1-x O2 (SSTO) colossal permittivity ceramics were successfully prepared and their properties were analyzed. The results showed that SSTO with a doping amount of 2% exhibited the best dielectric performance.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Cheng Chen, Yuanmiao Xie, Pengfei Chen, Chunchang Wang
Summary: The dielectric properties of (In0.5Nb0.5)0.1Ti0.9O2 ceramic sample were investigated, revealing two thermally activated relaxations at low and intermediate temperatures. TSDC investigations showed two relaxation processes in the sample, including a polaronic relaxation caused by electrons hopping between Ti3+ and Ti4+ ions. Additionally, a high-temperature relaxation related to humidity sensing property was observed near room temperature.
CERAMICS INTERNATIONAL
(2021)
Review
Chemistry, Multidisciplinary
Yi Wei, Wei Wang, Zhennan Wang, Hang Yang, Xinyu You, Yunna Zhao, Peipei Dang, Hongzhou Lian, Jianhua Hao, Guogang Li, Jun Lin
Summary: This review highlights the applications and properties of Bi3+-included lead-free metal halide materials in the field of optoelectronics, with a focus on the role and impact of Bi3+ ions in LFMH materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Biophysics
Menglin Song, Man-Chung Wong, Lihua Li, Feng Guo, Yuan Liu, Yingjing Ma, Xinyue Lao, Pui Wang, Honglin Chen, Mo Yang, Jianhua Hao
Summary: We have developed a point-of-care upconversion luminescence diagnostics (PULD) method combined with a streamlined smartphone-based portable platform for rapid testing of the SARS-CoV-2 nucleocapsid (N) gene. This method demonstrates high sensitivity and signal-to-noise ratio, and can accurately identify positive COVID-19 samples.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Physical
Fumei Yang, Man-Chung Wong, Jianfeng Mao, Zehan Wu, Jianhua Hao
Summary: In this study, high-quality multilayer SnSe nanosheets were synthesized by chemical vapor deposition and their piezoelectric properties were investigated. The results showed that SnSe nanosheets have high single-crystallinity and strong layer-dependent piezoelectric coefficient, allowing for high energy conversion efficiency and maximum power density. Based on this study, a self-powered sensor for human motion monitoring was developed.
Article
Nanoscience & Nanotechnology
Wei Han, Xiaodong Zheng, Ke Yang, Chi Shing Tsang, Fangyuan Zheng, Lok Wing Wong, Ka Hei Lai, Tiefeng Yang, Qi Wei, Mingjie Li, Weng Fu Io, Feng Guo, Yuan Cai, Ning Wang, Jianhua Hao, Shu Ping Lau, Chun-Sing Lee, Thuc Hue Ly, Ming Yang, Jiong Zhao
Summary: Large-scale 2D beta-In2Se3 films and alpha-In2Se3 films were successfully grown by chemical vapor deposition, and a complete phase transition enabled the obtainment of a full spectrum of paraelectric, ferroelectric and antiferroelectric 2D films.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Tianhong Zhou, Haisheng Chen, Jiaxing Guo, Yanan Zhao, Xiaona Du, Qingyi Zhang, Wenwen Chen, Taiyu Bian, Zhi Zhang, Jiaying Shen, Weiwei Liu, Yang Zhang, Zhenping Wu, Jianhua Hao
Summary: This study extends the research on mechanoluminescence (ML) into the high-frequency range by combining with piezoelectric actuators. Time-resolved ML of ZnS:Mn and ZnS:Cu, Al reveals frequency-dependent saturation and quenching associated with dynamic processes of traps. Furthermore, ZnS:Mn exhibits reversible frequency-induced broad red-shift into the near-infrared range by in-situ tuning the strain frequency.
Article
Multidisciplinary Sciences
Qingyi Zhang, Ning Li, Tao Zhang, Dianmeng Dong, Yongtao Yang, Yuehui Wang, Zhengang Dong, Jiaying Shen, Tianhong Zhou, Yuanlin Liang, Weihua Tang, Zhenping Wu, Yang Zhang, Jianhua Hao
Summary: By lattice and band engineering, Zhang et al. constructed a unipolar barrier avalanche photodiode with suppressed dark current and reinforced reverse breakdown. Ga2O3-based solar blind avalanche photodetectors exhibit low voltage operation, optical filter-free and monolithic integration of photodetector arrays, and therefore they are promising to be an alternative to the bulky and fragile photomultiplier tubes for weak signal detection in deep-ultraviolet region. These findings provide insights into precise manipulation of band alignment in avalanche photodetectors, and also offer exciting opportunities for further developing high-performance Ga2O3-based electronics and optoelectronics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Shuo Shi, Yifan Si, Zihua Li, Shuo Meng, Shuai Zhang, Hanbai Wu, Chuanwei Zhi, Weng-Fu Io, Yang Ming, Dong Wang, Bin Fei, Haitao Huang, Jianhua Hao, Jinlian Hu
Summary: Developing intelligent wearable protection systems is highly important for human health engineering. We have developed an intelligent wearable filtration system (IWFS) using advanced nanotechnology and machine learning, which exhibits reliable filtration efficiency, low pressure drop, healthcare monitoring function, and man-machine interactive capability. The IWFS has a high particle filtration efficiency of 99%, bacteria protection efficiency of 100%, and low-pressure drop of 5.8 mmH2O. It also possesses healthcare monitoring function and man-machine interactive capability, enabling real-time data collection and voice command transmission.
Article
Physics, Applied
Yuqian Zhao, Feng Guo, Sin-Yi Pang, Weng Fu Io, Lok-Wing Wong, Jiong Zhao, Jianhua Hao
Summary: The anisotropic Raman response of ultrathin black phosphorus (BP) transferred to an oxide dielectric substrate is investigated by utilizing a piezoelectric actuator to perform biaxial strain engineering. The strained Raman response is related to the variations of bond angle and bond length in BP, and biaxial strain modulation can change the anisotropic dispersion of BP.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhaoying Dang, Feng Guo, Huan Duan, Qiyue Zhao, Yuxiang Fu, Wenjing Jie, Kui Jin, Jianhua Hao
Summary: In this study, ferroelectric-tuned synaptic transistors were designed by integrating 2D black phosphorus with a flexible ferroelectric copolymer. These transistors exhibited high mobility, low energy consumption, and reliable synaptic behaviors, such as paired-pulse facilitation and long-term depression/potentiation. Furthermore, an artificial neural network was successfully simulated for handwritten digit recognition with a high accuracy of 93.6%. These findings highlight the potential of 2D ferroelectric field-effect transistors as ideal building blocks for high-performance neuromorphic networks.
Article
Chemistry, Multidisciplinary
Xinyue Lao, Yuan Liu, Lihua Li, Menglin Song, Yingjin Ma, Mo Yang, Guanying Chen, Jianhua Hao
Summary: This study presents an ultrasensitive biosensor based on core-shell upconversion nanoparticles and gold nanoparticles for accurate detection of SARS-CoV-2 viral RNA. The integration of FRET and surface plasmon greatly enhances the sensitivity of the biosensor, which has been validated using clinical samples.
Article
Nanoscience & Nanotechnology
Lihua Li, Zefeng Lin, Xingyi Xu, Wanshun Wang, Hu Chen, Zhibin Feng, Zhongmin Yang, Jianhua Hao
Summary: A self-enhanced catalytic nanocrystal BDS-GOx@MnOx based on a bismuth-manganese core-shell nanoflower was designed for 4T1 tumor theranostics in vitro and in vivo. The BDS-GOx@MnOx nanozymes enable enhanced starvation treatment (ST) and chemotherapy (CDT) with high efficacy and exhibit sensitive tumor microenvironment (TME) responsive character for tumor therapy as well as for tumor-enhanced computer tomography (CT) and magnetic resonance (MR) diagnostic imaging.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Wei Xu, Hongzhen Liu, Man-Chung Wong, Huimin He, Jianhua Hao, Lizhi Xu
Summary: The researchers have used a mechanically strong and mildly healable polymer (THP) as the key material for triboelectric nanogenerators (TENGs). THP is based on polyurethane-urea containing coordinate bonds, and its healing can be triggered by simply wetting the breakage area. The THP-TENGs exhibit high enough robustness to withstand mechanical loading and excellent healability for recovering device functionalities after mechanical damage.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Feng Guo, Weng Fu Io, Zhaoying Dang, Ran Ding, Sin-Yi Pang, Yuqian Zhao, Jianhua Hao
Summary: Currently, most three-terminal neuromorphic devices only have an active gate terminal, limiting the implementation of complex neural behaviors and brain-like thinking strategies. In this study, we utilize the unique co-existing in-plane and out-of-plane ferroelectricity in 2D & alpha;-In2Se3 to create a three-active-terminal neuromorphic device with each terminal capable of modulating conductance. Through the cooperative mode, we achieve control of food intake as a complex nervous system-level behavior and implement reinforcement learning using the coupling effect between polarizations in different directions. The practicality of three-active-terminal neuromorphic devices in handling complex tasks and their potential for implementing brain-like learning strategies are demonstrated.
MATERIALS HORIZONS
(2023)
Review
Chemistry, Physical
Xiao Han, Xueyuan Qiu, Meng Zong, Jianhua Hao
Summary: As an emerging family of 2D nanomaterials, early transition metal carbides and carbonitrides (MXenes) have shown great potential in various applications. Research on MXene-based polymer nanocomposites has gained increasing attention due to their improved oxidation and damage tolerance. MXenes can enhance the mechanical properties and provide desired thermal/electrical properties to polymer. The assembly of MXene nanosheets into MXene macrostructures (MMs) is an effective strategy to optimize the performance of the nanocomposites. This review summarizes recent research progress on MMs/polymer nanocomposites, focusing on the relationships among structures, fabrication techniques, and performance. It also discusses the applications of these nanocomposites in heat/electrical conduction, electromagnetic shielding, and flexible devices. Challenges and future perspectives for multifunctional MMs/polymer nanocomposites are also highlighted.
Article
Chemistry, Multidisciplinary
Huan Duan, Dehui Wang, Jingxi Gou, Feng Guo, Wenjing Jie, Jianhua Hao
Summary: This study fabricates two-terminal memristors based on two-dimensional MoSe2 nanosheets, which exhibit analog resistive switching (RS) behaviors and can simulate the synaptic plasticity of the human brain. The fabricated memristors successfully implement synaptic functions and achieve a high recognition accuracy of 92% in image recognition tasks. They can also emulate the learning-forgetting experience of the human brain and recognize noxious stimuli as artificial nociceptors. This research provides comprehensive investigations and promising prospects for neuromorphic computing based on 2D MoSe2 nanosheets.
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)
