CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 28
·56185-56193
·
IF 5.6
Jinxin Fu,Changrong Zhou,Jun Chen,Huihui Liu,Hao Yang,Qingning Li,Changlai Yuan,Jiwen Xu,Guanghui Rao
The incomplete preferred orientation polarization and partially back-switching reoriented domains during/after poling with electrical loading and unloading were ubiquitous and suppressed both piezoelectric constant ( d 33 ) and depolarization temperature ( T d ) of piezoelectric ceramics. In this work, a simple poling strategy with multi-cycles of AC electric field is proposed to realize polarization wake-up in unmodified 0.92Bi 0.5 Na 0.5 TiO 3 -0.08BaTiO 3 (BNT-8BT) with significantly enhanced d 33 from 65 pC/N to 161 pC/N and high T d of 200 °C simultaneously. Through comprehensive analysis on the polarization wake-up and polarization switching process, it is demonstrated that remarkably improved d 33 originates from AC cycles poling induced coexistence of P 4 bm and P 4 mm phases, depinned domains and defect dipoles orientation polarization. The internal bias field (E i ) resulted from defect dipoles orientation aids the d 33 and its high temperature stability. Our work provides a convenient and inexpensive method that there need not commonly delicate compositions control in lead-free piezoceramics on advancing to alleviate the trade-off between d 33 and T d .
研究领域:
材料科学
·
功能陶瓷
·
压电材料
·
固态物理
·
无铅压电体
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Linyun Zhang,Yijing Sun,Shanxin Li,Xuzhou Jiang,Hongying Yu
M−Mo−N (M = Co, Ni) bimetallic nitrides, known for their distinctive mechanical, magnetic and electrical properties, hold significant potential as microwave absorption (MA) materials. However, it remains challenge to obtain high-performance microwave absorbers from these bimetallic nitrides. In this work, the rod-like MoO 2 /Co 2 Mo 3 N/Co 3 Mo 3 N/Ni 3 Mo 3 N (MoCoNi) composites consisting of connected nanoparticles are fabricated in situ. The plentiful interfaces between the connected nanoparticles and between the different components effectively enhance the interfacial polarization, the rod-like structure benefits to conduction loss, and crystal defects facilitate strong dipole polarization. Therefore, MoCoNi composites achieve outstanding absorption properties with the reflection loss of −55.69 dB at 8.08 GHz and the effective absorption bandwidth of 6.48 GHz (11.36–17.84 GHz) at 2.4 mm. The actual MA performance of MoCoNi composites is verified through radar cross section simulation. This study proposes a novel approach for the utilizing of M−Mo−N (M = Co, Ni) bimetallic nitrides in microwave absorptions.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jiahao Sun,Xiaoxiao Huang,Yuhao Liu,Kaili Zhang,Yuefeng Yan,Yanan Liu,Xu Yan
Carbon fiber (CF) is a research focus due to its high performance in aviation, aerospace, and defense. However, its inherent high electrical conductivity makes it impedance mismatched. Herein, a material was prepared by grafting and coating SiO 2 on short-cut carbon fiber (SCCF). The structure of SiO 2 layer coated on the surface of SCCF brings about a stronger synergy of multiple loss mechanisms such as interface polarization and dipole polarization. It is shown that with the increase of SiO 2 content, it has a significant optimizing effect on the impedance matching of SiO 2 /SCCF composites, and the SiO 2 layer structure increases the loss mechanisms of interface and dipole polarization. At 2 vol% filling ratio and 6.35 GHz frequency, corresponding reflection loss (RL) value was −29.3 dB. Meanwhile, the SiO 2 /SCCF composite achieves an ultra-broadband electromagnetic wave absorption performance with an effective absorption bandwidth (EAB) of 12.3 GH. Therefore, this work provides a strategy for designing efficient and lightweight CF-based composites with electromagnetic wave absorption performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Fei Liu,Xiangjie Zhuang,Zoufei Du,Yi Dan,Yun Huang,Long Jiang
Although photocatalysts can convert plastic wastes into energy fuels and show unique advantages in the treatment of plastic wastes, photocatalytic efficiency is still limited by the fast recombination of photoexcited charges. In this paper, potassium niobate (KNbO 3 ) nanosheet with the ferroelectric property was synthesized and polarized under an external electric field. Polarization does not change the morphology and structure of KNbO 3 , but effectively enhances the spontaneous polarization field. This spontaneous polarization field exists through the whole material and can effectively improve the separation of photogenerated charges. The photocatalytic efficiency of polarized KNbO 3 (P-KNbO 3 ) for degradation of PE and PP improves by about 210 % and 140 %, compared with KNbO 3 . P-KNbO 3 also shows excellent photocatalytic activity for the degradation of real-world waste plastic products (plastic bags, gloves, tubes and boxes). This study might provide insights into designing high-efficiency photocatalysts for plastic waste treatment by regulating and controlling the polarization of ferroelectric materials.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuchen Gu,Qianqian Niu,Qunxiang Cao,Xinglu Zhou,Weikun Zhao,Zhanao Hu,Suna Fan,Xiang Yao,Yaopeng Zhang
Bio-based triboelectric nanogenerators (TENGs) are expected to power medical device and detect real-time human motion behavior due to eco-friendliness and biocompatibility. However, the output performance of the TENGs needs to be boosted. In this study, a biodegradable silk fibroin-based TENG with enhanced output performance regulated by interfacial and ionic polarization is proposed. The friction layers, regenerated silk fibroin (RSF) film and silk nanoribbon (SNR) film, are functionalized through the induction of histidine with imidazolyl and lithium chloride, respectively, thus increasing the dielectric constant and triboelectric properties of friction layers. The enhancement is attributed to the enlarged difference of electron-absorbing ability and electron-donating ability of the two friction layers. The total silk fibroin-based TENG shows a maximum voltage of 63.0 V, and a current of 2.4 μA. Moreover, the obtained maximum power density of 828.8 mW m −2 is 9.5 times higher than that of the counterpart without functionalization. And the output power density is much higher than that of existing fully degradable bio-based TENGs reported previously. The components of the silk fibroin-based TENG can gradually degrade in vitro . As a wearable device, the silk fibroin-based TENG can precisely monitor real-time human motion due to its high sensitivity, which can realize self-powered supply and simultaneous sensing. Moreover, the unencapsulated TENG is successfully used as a self-powered humidity sensor. The bio-based TENGs with enhanced performance highlight their application potential in wearable and implantable fields.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yujing Zhang,Yilin Zhang,Yuping Li,Minhao Yao,Xuefei Miao,Chuyang Liu,Huikun Zhao,Yanyan Shao,Feng Xu
BaTiO3@C nanoparticles with a core–shell nanostructure were synthesized through a facile hydrothermal and dopamine carbonization process. The microstructure of nanoparticles and microwave absorption performance of the nanoparticle/paraffin composite were systematically investigated. Dense heterogeneous interfaces and conductive carbon shells are formed on the surfaces of the BaTiO3 nanoparticles. The enhanced interfacial polarization, dipole polarization, and conductive loss contribute to the improved microwave absorption properties with a minimum reflection loss of −27.1 dB (>99.9% microwave absorption) and a broad bandwidth of 6.0 GHz at a thickness of only 1.8 mm. This work suggests a feasible approach for the efficient production of core–shell-structured nanoparticles with excellent absorption properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Renzhi Xiong,Fangde Liu,Yiting Sun,Yuhao Wu,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Enhancing the ferroelectric polarization field and tuning the electron spin polarization as novel approaches to improve photocatalytic performance have sparked considerable research interest. Obviously, a straightforward strategy to simultaneously regulate ferroelectric and spin polarization will have a very attractive application prospect. In this study, a series of Bi 4 NbO 8 Cl-Ni photocatalysts are synthesized by doping different concentrations of magnetic element Ni into ferroelectric semiconductor Bi 4 NbO 8 Cl. Due to the significant difference in atomic radius, Ni doping induces greater structural distortion and enhances the deviation of positive and negative charge centers in the crystal, thereby resulting in a stronger ferroelectric polarization field. Moreover, spin polarization is induced in the electrons, and photogenerated carriers exhibit higher spatial separation efficiency under magnetic field. Thanks to the synchronous regulation of ferroelectric and spin polarization by Ni doping, the average rates of H 2 and O 2 production from photocatalytic water splitting over Bi 4 NbO 8 Cl-Ni under visible light are 342.6 and 207.1 µmol g −1 h −1 , respectively, which are 10.6 and 2.7 times those of pure Bi 4 NbO 8 Cl. Notably, under an applied magnetic field of 300 mT, the average production rates are further promoted up to 616.7 and 331.4 µmol g −1 h −1 . This study offers a novel strategy to significantly improve photocatalytic performance.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jiang Wu,Qi Xu,Enzhu Lin,Baowei Yuan,Ni Qin,Santhosh Kumar Thatikonda,Dinghua Bao
Piezoelectric effect, commonly known as a change in electric polarization in piezoelectric/ferroelectric materials under mechanical stress, is extensively employed as a driving force for the catalytic degradation of organic pollutants. However, the relationship between electric polarization and piezocatalytic activity is still unclear. In this work, we investigated the role of ferroelectric polarization in the piezocatalytic activity of BaTiO3 nanoparticles through annealing BaTiO3 at different temperatures or poling BaTiO3 at different electric fields. The BaTiO3 nanoparticles annealed at 800 °C exhibit effectively enhanced piezocatalytic activity compared with those annealed at other temperatures. The polycrystalline particles annealed at higher temperatures exhibit a greatly reduced catalytic activity. After poling, the piezocatalytic activity of the polycrystalline BaTiO3 particles was obviously improved. In addition, we identified the free radical species and the intermediate products of the catalytic reaction. We also well-explained the dependence of electric polarization in the BaTiO3 piezocatalyst on annealing temperature and ultrasonic vibration theoretically. Our study indicates that increasing ferroelectric polarization (but not crystallite size) can effectively enhance the piezocatalytic activity. We believe that the present work provides a clear understanding of the role of ferroelectric polarization in piezocatalysis.
研究领域:
材料科学
·
环境催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jinpeng Ma,Ke Zhu,Da Huo,Bingzhong Shen,Yang Liu,Xudong Qi,Enwei Sun,Rui Zhang
The performances of 1–3 piezocomposite materials under various poling conditions were compared and analysed. The dielectric , piezoelectric , and electromechanical properties of 1–3 piezocomposite materials were studied with variations in the electric field amplitude ( E p ), poling frequency ( f ), and number of cycles ( C ). It was found that the piezoelectric coefficient ( d 33 ), free dielectric constant ( ε 33 T / ε 0 ), and electromechanical coupling factor ( k t ) of 1–3 piezocomposite materials exhibit an increase of 21.4%, 13%, and 10.7%, respectively, under the optimum alternating current poling (ACP) condition ( f = 1.25 Hz, E p = 2 kV/mm, C = 16), compared with that of the samples poled using the direct current polarisation (DCP) method. The studies of the domain pattern indicate that the performance enhancement originates from the remarkable regularly striped domain structure and high domain wall density in ACP-poled samples. Our results suggest that the ACP method is effective in enhancing the performance of composite piezoelectric materials , which possess great benefits and potential for application in acoustic/medical transducers.
研究领域:
材料科学
·
声学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2018
·
IF 3.146
Minglun Li,Yuyuan Lu,Lijia An
Using our recently proposed method to obtain salt and ion polarizabilities in aqueous solutions, we determine the polarizabilities of five salts (LiCl, NaCl, NaBr, KBr, and MgSO4) in water–acetonitrile, water–ethanol, and water–acetone solutions at eight different water–organic solvent compositions at the D-line of sodium (589.3 ± 0.1 nm). Setting Li+ as the reference ion, we determine the ion polarizabilities of Na+, Cl–, and Br– in binary liquid mixtures. Our results show that cation polarizability is nearly unaffected by solvent composition, but anion polarizability exhibits a nonmonotonic behavior with increasing mole fraction of the organic component in the liquid mixture. This suggests that ion polarizability in a solution is affected by the solvent. The results of salt and ion polarizabilities can be used as important reference data for physical chemistry, atmospheric science, and biophysics.
研究领域:
物理化学
·
大气科学
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 28
·2214544
·
IF 19
Yutie Gong,Jiayu Zhao,Zhenzhen Li,Jing Huang,Yang Zhang,Lijie Dong,Chuanxi Xiong,Ming Jiang
Dielectric switching materials are prospective candidates for smart electronic/electrical applications, and high dielectric switching ratios are crucial for their practical applications. However, the substantial improvement of the dielectric switching ratio is limited by the available dielectric switching mechanisms, and obtaining high dielectric switching ratios is a major challenge. Here, an unparalleled dielectric switching effect is reported in a water-in-oil emulsion system, caused by dual polarization synergy below the dielectric transition temperature in concert with suppression of the electrode polarization above the dielectric transition temperature. The synergistic dielectric switching effect of interfacial polarization and electrode polarization endows the emulsion with unprecedentedly high dielectric switching ratios. The highest room temperature dielectric switching ratio of this emulsion system up to 2.86 × 10 6 at 20 Hz, is four orders of magnitude higher than the highest switching ratio reported so far. The unparalleled high dielectric switching ratio, reliable cycle stability, good frequency adaptability, and satisfactory scalability make the inorganic salt solution/octadecane emulsions potentially excellent candidates for high-sensitivity room-temperature smart switching or sensing devices.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Haiyang Liu,Mengyu Liu,Chunmiao Zhang,Feiya Xu,Xuanli Zheng,Xu Li,Zhiming Wu,Yaping Wu,Junyong Kang
Janus transition metal dichalcogenides host a unique structural asymmetry that enhances their potential for spintronics and valleytronics. Here, using a phase engineering strategy, a hybrid H/T-MoSeS monolayer is synthesized via in situ plasma substitution. Theoretical analysis predicts a valley splitting of 7.35 meV, which is experimentally realized, with a 2.7-fold enhancement in the g-factor compared to the H-MoSeS. The substantial valley splitting originates from the additional exchange interactions and spin imbalance introduced by the T-phase. The coupling with the T phase further results in electrically tunable valley polarization, which reveals a sharp increase within ±20 V, gradually saturates at higher voltages, and reaches a high ratio of up to 43.8% for trions at room temperature. Such an enhancement is accompanied by elongated exciton lifetimes due to the increased electron concentration and phase-modulated Janus polarization field. All these findings reveal the synergistic interplay between phase engineering and the polarization field in Janus structures, providing a development strategy for 2D spin-valley devices with designed phase components and structural symmetry.
研究领域:
凝聚态物理
·
材料科学
·
纳米科技
·
半导体物理
·
低维材料
·
自旋电子学
·
激子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）