ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Peng Li,Gong Jinghua,Ma Jinghong
Electro-responsive hydrogels have attracted great attentions because the electric stimuli is easy to be applied and controlled. Thus, it is expected to generate electro-responsive hydrogel fiber to improve electro-response rate. In this paper, graphene oxide/hydrolyzed polyacrylamide/sodium alginate (GO/HPAM/SA) hydrogel fibers were prepared by microfluidic spinning. The structure and morphologies of hydrogel fibers were characterized by FTIR and SEM. The electro-response behaviours were also studied. The results indicate that GO/HPAM/SA hydrogel fibers exhibit bending deformation in an electric field. In Na 2 SO 4 solution, the hydrogel fibers first bend toward the cathode, and then bend toward the anode. It is suggested the bending of the hydrogel fibers is caused by two major factors, one is the osmotic pressure difference, another is the pH gradient induced by electrochemical reactions. Keywords Electro-responsive hydrogel fiber Bending behaviour Osmotic pressure difference pH gradient
研究领域:
材料科学
·
生物工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Lizhen Lu,Haoyu Zhang,Jinghui Wang,Haolin Wang,Qian Chen,Jinbo Xue,Qianqian Shen,Chunliang Zhou,Jian Ku Shang,Qi Li
A ferroelectric ceramic material of Na 0.5 Bi 0.5 TiO 3 was found to possess a pronounced, long-lasting, and fast-switchable photochromic behavior responsive to visible light. The working mechanism of its photochromism could be attributed to an interesting photocatalytic memory effect , during which photogenerated electrons were trapped by Bi 3+ /Ti 4+ and oxygen vacancies generated in Na 0.5 Bi 0.5 TiO 3 . The release kinetics of trapped electrons could be modulated by controlling environment conditions to make its photochromism phenomenon both long-lasting and fast-switchable to meet various application requirements. In the meantime, the photochromism process changed its inner electronic structure, resulting in stronger oxidation capability, increased piezoelectric response, improved charge carrier separation and transfer, and more active oxygen species production. Thus, its photocatalytic, piezocatalytic and photopiezocatalytic performances were all significantly enhanced as demonstrated by its TC-HCl degradation performances. This work offered a novel approach to search for and design inorganic photochromic materials with good reversibility for various technical applications.
研究领域:
材料科学
·
光催化
·
无机化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 19
·15520-15532
·
IF 2.779
Zhang Xiaoyan,Yang Xu,Wang Zhaopeng,Pan Qi,Chu Baojin,Zuo Ruzhong
Our previous work proposed that except for ferromagnetic and piezoelectric properties, mechanical quality factor is also an important parameter for high magnetoelectric response of BiFeO 3 -based multiferroic ceramics. In this work, in order to improve the mechanical quality factor of BiFeO 3 -based ceramics and obtain higher magnetoelectric response, we use Mn as a dopant and prepare 0.75BiFe 1− x Mn x O 3 -0.25BaTiO 3 ( x = 0, 0.0025, 0.005, 0.0075, 0.01) ceramics. The dielectric, piezoelectric, magnetic, and magnetoelectric properties of the ceramics with different Mn doping levels and different sintering temperatures are studied comprehensively. We find that the piezoelectric response, mechanical quality factor, ferromagnetic property, and magnetoelectric response can be improved by optimization of the composition and sintering temperature of the ceramics. A large magnetoelectric coefficient α E \(\sim\) 2 V/(cm Oe) is achieved at resonant frequency when doping content of Mn is 0.75 mol% and sintering temperature is 1030 \(\mathrm{^\circ{\rm C} }\) . Such high value of α E is attributed to the combined effect of improved mechanical quality factor, high piezoelectric coefficient, and enhanced ferromagnetism. It is among the largest α E values obtained in single-phase BiFeO 3 -based ceramics. Moreover, our work further verifies the mechanical quality factor is an important parameter to achieve a high magnetoelectric response in BiFeO 3 -based ceramics.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 41
·2303847
·
IF 19
Su-Yun Zhang,Zhimin Mao,Duo Zhao,Chunmei Wang,Wei Tang,Yifei Xie,Chenxu Kang,Huawei Liang,Haoliang Liu,Yu-Jia Zeng
2D ferromagnetic semiconductors are key to next-generation spintronic devices in the post-Moore era. The combination of ferromagnetic and optoelectronic properties offers exciting opportunities for advanced multifunctional devices in spin-optoelectronic applications. Herein, the authors synthesize 2D van der Waals (vdW) Co x Sn 1- x S with ferromagnetism and photoresponse through a bottom-up reaction, which has a high yield compared to typical mechanical exfoliation. Ferromagnetic ordering is realized in 2D vdW semiconductor SnS by Co doping at the Sn sites. Magnetic properties are thoroughly studied at different doping concentrations, and first-principles calculations are further performed to reveal the magnetism origin and spin interactions. In particular, a low Gilbert damping of 1.69 × 10 −3 is obtained in vdW Co x Sn 1− x S through ferromagnetic resonance. In addition, photodetectors based on Co x Sn 1− x S quantum dots are demonstrated. These studies establish a promising semiconductor with both ferromagnetic ordering and photoelectric response, which provides unprecedented opportunities in spintronic-photonic integrated applications.
研究领域:
材料科学
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凝聚态物理
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半导体器件
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 17
·2500216
·
IF 7.2
Xin Wang,Le-Yang Dang,Xu Zhang,Jia-Qi Zhu,Gui-Gen Wang
Doping can effectively adjust the energy band structure of a semiconductor, thereby influencing its electrical and optical properties. In this study, density functional theory is employed to calculate the crystal structure, electronic configurations, energy bands, and optical properties of tellurium-doped Bi 2 O 2 Se (Bi 2 O 2 Se 1-x Te x ), demonstrating that Te substitution lowers the conduction band, reducing the bandgap. Then 2D Bi 2 O 2 Se 1-x Te x nanosheets are synthesized via organic ion template-guided solution growth method, with Te doping controlled by the Te/Se molar ratio. Optical spectroscopy confirmed that tellurium doping significantly modulates the electronic properties of Bi 2 O 2 Se. When the doping molar concentration is 30%, its bandgap decreases to 0.57 eV. Therefore, Bi 2 O 2 Se 1-x Te x nanosheet-based photodetector demonstrates obvious enhancement of the photoelectric response in the near-infrared region. Notably, Bi 2 O 2 Se 0.7 Te 0.3 photodetector demonstrates broadband photosensitivity across 650–1550 nm, with high responsivity of 32.87 A W −1 and enhanced detectivity of 8.89 × 10 9 Jones at 1060 nm. The device also features a short response time of 16.8/11 µs at 1550 nm. Moreover, the photo-response of the detector shows reliable working stability. Finally, the photodetector is utilized for single-pixel imaging, showcasing its high-contrast infrared light detection capability. These results indicate that Bi 2 O 2 Se 1-x Te x is a promising material for high-sensitivity infrared light detection applications.
研究领域:
材料科学
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凝聚态物理
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 36
·1-9
·
IF 2.8
Fu Jinxin,Zhou Changrong,Chen Jun,Yu Dongyan,Wu Di,Li Qingning,Yuan Changlai,Xu Jiwen,Rao Guanghui
The incompatibility of the large piezoelectric response ( d 33 ) and high depolarization temperature ( T d ) in lead-free piezoelectric ceramics limited their practical applications. The most used modification methods for improving d 33 or T d commonly required a delicate control of complex compositions. Here, a strategy for simply changing the sintering temperature is used to defer the T d and increase d 33 simultaneously. The T d and d 33 of unmodified Bi 0.5 Na 0.5 TiO 3 -0.2Bi 0.5 K 0.5 TiO 3 (BNKT20) ceramics increase with increasing sintering temperature until both of them reach the maximum ( d 33 ~ 174pC/N, T d ~ 177 °C) at the sintering temperature of 1100 °C. In-depth analysis unveils the critical role of multiphase coexistence and oxygen vacancies in enhancing T d by optimizing sintering temperature. Meanwhile, increasing sintering temperature promotes large grain size with easy domain orientation, thus, yielding the improved d 33 . This work provides a simple and effective method to broaden the working range of Bi 0.5 Na 0.5 TiO 3 -based (BNT) piezoelectric ceramics at high temperature under the premise of realizing high piezoelectric properties.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Huayong Luo,Kelin Wu,Qin Wang,Tian C. Zhang,Hanxing Lu,Hongwei Rong,Qian Fang
We explore the feasibility of utilizing electro-responsive hydrogels as novel forward osmosis (FO) draw agents for desalination. The chemically cross-linked hydrogels were synthesized via free radical copolymerization of common acrylamide (AM) with strong anionic comonomer 2-acrylamido-2-methyl- 1 -propanesulfonic acid (AMPS). The morphology, chemical structure , water-adsorbing capacity, and water state of the hydrogels were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), a swelling test, and differential scanning calorimetry (DSC). The water-swollen hydrogels exhibited electroresponsiveness as shrinking and expanding reversibly with the on-off switching of the electric field in an electrode contact system. The magnitude of hydrogels’ deswelling increased with the increase in the degree of swelling and applied voltages. This dehydration phenomenon was induced by the decrease in hydration power of microcounter ions due to the interaction with the electrodes by water electrolysis. The hydrogels were proved to be capable of generating a reasonable water flux of 2.76 L m −2 h −1 (LMH) from brackish water (2000 ppm NaCl solution) due to their high swelling pressure. In addition, the water flux was affected by the amount of hydrogel particles on the membrane surface. Importantly, the prepared hydrogels could effectively release around 71% of the adsorbed water at an applied voltage of 15 V for 40 min, and were able to maintain their water flux and water recovery performances up to three times regeneration. Results indicate that the electric field is an attractive alternative stimulus for extracting desirable water from the hydrogel draw agent in the FO desalination process.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Hongtao Cui,Hanmin Zhang,Mingchuan Yu,Fenglin Yang
Forward osmosis (FO) has gained more attentions because it has the potential to be an emerging desalination technology . Stimuli-responsive hydrogels, as a novel class of FO draw agent, can completely avoid reverse solute diffusion and release water easily under external stimuli. In this study, 2-Acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and 2-(Dimethylamino)ethyl methacrylate (DMAEMA) monomers are used to prepare a series of electric-responsive AMPS/DMAEMA hydrogels by aqueous solution polymerization . These hydrogels are adopted as draw agent, by using 2000 ppm NaCl solution as the feed, A0.55D0.45 and A0.53D0.47 hydrogel show better initial water fluxes which are 2.09 and 1.63 LMH, separately. And A0.55D0.45 hydrogel produces 16.12 L·m − 2 total water flux and 0.67 average 24 h water flux. These hydrogels are dehydrated under 15 V electric stimuli. After the first regeneration, their corresponding water recovery rates are 67.45% and 39.36%, separately. After the second regeneration, their initial water fluxes are still recorded at 1.54 and 1.08 LMH, respectively. In contrast with other published literatures, the water flux produced by as-prepared hydrogels has increased significantly. Moreover, using an external electric field to achieve regeneration can simplify the operation of forward osmosis process.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2020
·
IF 2.857
Jia Zhao,Qi Lei,Fang He,Chen Zheng,Yang Liu,Xiaopeng Zhao,Jianbo Yin
The size influence of quaternary ammonium countercations in poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide][tetraalkylammonium] (P[STFSI][Nnnnn], n = 1, 2, and 3) poly(ionic liquid)s on dielectric polarization and the stimuli-responsive electrorheological effect is investigated by dielectric spectroscopy and rheology, and the microstructure-level understanding behind the influence is analyzed by Raman and X-ray scattering spectra. The size influence of quaternary ammonium cations is found to be nonmonotonic. The largest electrorheological effect accompanied by best polarization properties is demonstrated in P[STFSI][N2222]. Raman spectra and activation energy measurements demonstrate that the nonmonotonic influence originates from the fact that, compared to small N1111+ and large N3333+, intermediate N2222+ as countercations can contribute a higher mobile ion number and lower activation energy barrier of ion dissociation and motion. But the experimental values of activation energy are not consistent with theoretically calculated values by considering the ion pair electrostatic potential and elastic force contribution of the matrix. By X-ray scattering and diffraction characterizations, it is clarified that the nonmonotonic influence and the inconsistency of activation energy originate from the size influence of Nnnnn+ on the micromorphology of P[STFSI][Nnnnn]. Compared to the semicrystalline structure of P[STFSI][N1111] and the ionic aggregation structure of P[STFSI][N3333], the relatively uniform amorphous structure of P[STFSI][N2222] may be responsible for its lower activation energy barrier of ion motion. This study further provides insights into the design and preparation of future poly(ionic liquid)-based electrorheological materials by considering not only molecular structure but also micromorphology.
研究领域:
材料科学
·
物理化学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chuanqi Liu,Dingyu Yang,Haibo Tian,Wen Zhang,Jun Zhu
The CsPbX 3 perovskites have demonstrated promising applications in the field of X-ray detection. Appropriate element doping to substitute Pb in CsPbX 3 not only improves the photoresponse performance of the resulting material but also reduces the Pb content for achieving environmental protection. Herein, X-ray detectors based on Sr-doped CsPb 1-x Sr x Br 3 thick films were developed. The effects of Sr doping concentration were investigated. The incorporation of Sr increased the density of the CsPbBr 3 thick film and modulated the bandgap of the materials. CsPb 1-x Sr x Br 3 exhibited good optical responses at different bias voltages and X-ray doses. The X-ray response improved as the Sr-doping concentration increased. Therefore, the partial substitution of Sr into CsPbBr 3 is suitable for reducing the Pb content in X-ray detectors. Furthermore, the development of CsPb 1-x Sr x Br 3 thick films provides a new strategy for the detection of X-rays.
研究领域:
材料科学
·
医学成像
·
环境科学
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产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 22
·3748-3753
·
IF 4.568
Ronghua Yi,Jin Wang,Xiaoping Yue,Yan Liang,Zhuoyao Li,Huixiang Sheng,Mengdan Guan,Yameng Zhu,Qizeng Sun,Li Wang,Xiao Huang,Gang Lu
Graphical Single-crystalline Bi 9 O 7.5 S 6 thin nanosheets were successfully synthesized by using a solvothermal method. The thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits a sensitive photoelectric response to light in a wide range of 400–800 nm. Bismuth-based compounds possess layered structures with a variety of stacking modes, endowing the compounds with diverse properties. As one type of bismuth oxysulfides, Bi 9 O 7.5 S 6 nanocrystals has great applications in photodetection; however, the responsivity of bulky Bi 9 O 7.5 S 6 is limited due to the poor charge separation. Herein, single-crystalline Bi 9 O 7.5 S 6 thin nanosheets are successfully synthesized by using a solvothermal method. The thickness of the obtained Bi 9 O 7.5 S 6 nanosheets is down to 15 nm and can be easily tuned by varying the reaction period. Moreover, the Bi 9 O 7.5 S 6 nanosheets show strong light absorption in the visible and near infrared range, making it a promising candidate in optoelectronics. As a demonstration, the thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits sensitive photoelectric response to light in a wide range of 400–800 nm. The responsivity of the device reaches up to 1140 μA W −1 , and the performance of the device is stable after long-period illumination. This work demonstrates a great potential of the thin Bi 9 O 7.5 S 6 nanosheets in optoelectronic devices, and these nanosheets may also be extended to various optoelectronic applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 46
·2307705
·
IF 29.4
Jianye Kang,Xuewei Zhang,Xinyu Yang,Xuhao Yang,Shutao Wang,Wenlong Song
Enabling the living capability of secreting liquids dynamically triggered by external stimuli while maintaining the bulk frame is a significant challenge for mucosa-inspired hydrogels. A mucosa-inspired electro-responsive hydrogel is developed in this study using the synergy between electro-responsive silk fibroin supramolecular non-covalent networks and covalent polyacrylamide and polyvinyl alcohol polymer networks. The formed supramolecular-covalent hydrogel exhibits a partial gel-sol transition upon the application of an electric field, and the liquid layer on the hydrogel surface near the cathode is used to mimic the mucus-secreting capability to regulate lubrication. The electro-responsive lubricating process can operate under a safe voltage and exhibits good reversibility. It is also a universal strategy to construct an electro-responsive hydrogel by introducing an electro-responsive supramolecular network into the polymer network. This mucosa-inspired electro-responsive supramolecular-covalent hydrogel offers a promising method for designing soft actuators or robots that can regulate lubrication using an electric strategy.
研究领域:
材料科学
·
生物医学工程
·
仿生学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）