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  • Wiley  (7)
  • Zhao, Chunlin  (7)
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  • Wiley  (7)
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  • 1
    Online Resource
    Online Resource
    Defect suppression in CaZrO 3 ‐modified (K, Na)NbO 3 ‐based lead‐free piezoceramic by sintering atmosphere control
    Wiley ; 2018
    In:  Journal of the American Ceramic Society Vol. 101, No. 8 ( 2018-08), p. 3393-3401
    Details
    In: Journal of the American Ceramic Society, Wiley, Vol. 101, No. 8 ( 2018-08), p. 3393-3401
    Abstract: During high‐temperature crystal growth, lattice defects will inevitably form inside piezoelectric materials, which can be a hindrance for performance optimization. Through appropriate atmosphere control during sintering, defect levels inside the piezoelectric material can be regulated. Herein, CaZrO 3 ‐modified (K, Na)NbO 3 ‐based lead‐free piezoelectric ceramics with a nominal composition of 0.95(Na 0.49 K 0.49 Li 0.02 )(Nb 0.8 Ta 0.2 )O 3 ‐0.05CaZrO 3 are produced by sintering in an oxygen‐rich atmosphere. Compared with an air‐sintered sample, the piezoelectric constant of the oxygen‐sintered sample has greatly improved 15% up to 390 pC/N, which is comparable to commercial lead‐based counterparts. In addition, the planar electromechanical coupling factor k p is enhanced from 0.46 to 0.52. A qualitative model related to defect engineering is proposed to support the experimental observations. Our results indicate the feasibility of purposely optimizing the piezoelectric performance by sintering atmosphere control.
    Type of Medium: Online Resource
    ISSN: 0002-7820 , 1551-2916
    URL: Issue
    URL: Article
    DOI: 10.1111/jace.2018.101.issue-8
    DOI: 10.1111/jace.15488
    RVK:
    VA 1120
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2008170-4
    detail.hit.zdb_id: 219232-9
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  • 2
    Online Resource
    Online Resource
    Defect Engineering in Lead Zirconate Titanate Ferroelectric Ceramic for Enhanced Electromechanical Transducer Efficiency
    Wiley ; 2021
    In:  Advanced Functional Materials Vol. 31, No. 1 ( 2021-01)
    Details
    In: Advanced Functional Materials, Wiley, Vol. 31, No. 1 ( 2021-01)
    Abstract: Lead zirconate titanate (PZT)‐based piezoelectric ceramics are important functional materials for various electromechanical applications, including sensors, actuators, and transducers. High piezoelectric coefficient and mechanical quality factor are essential for the resonant piezoelectric application. However, since these properties are often inversely proportional, simultaneously high performances are hard to achieve, consequently, a wide range of applications are strongly restricted. In the present study, exceptionally well‐balanced performances are achieved in PZT‐based ceramics via innovative defect engineering, which involves multi‐scale coordination among defect dipole, domain‐wall density, and grain boundary. These materials are superior to many state‐of‐the‐art commercial counterparts, which can potentially satisfy high‐end requirements for advanced electromechanical applications, such as energy harvesting, structural health monitoring, robotic sensors, and actuator.
    Type of Medium: Online Resource
    ISSN: 1616-301X , 1616-3028
    URL: Issue
    URL: Article
    DOI: 10.1002/adfm.v31.1
    DOI: 10.1002/adfm.202005012
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2029061-5
    detail.hit.zdb_id: 2039420-2
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    An efficient strategy to design and construct high‐strength and fluorescence poly(vinyl alcohol) hydrogels via freeze–Thaw cycles
    Wiley ; 2023
    In:  Journal of Applied Polymer Science Vol. 140, No. 40 ( 2023-10-20), p. 1-9
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 140, No. 40 ( 2023-10-20), p. 1-9
    Abstract: Fluorescent hydrogels are soft materials that can emit light under certain conditions, which makes them attractive for biomedical and engineering applications. Nevertheless, one of the major challenges in developing fluorescent hydrogels is their low mechanical properties. To overcome this challenge, we have developed an efficient method for preparing high‐strength and fluorescence hydrogels via freeze–thaw cycles. This approach offers a promising solution to enhance the mechanical properties of fluorescent hydrogels, which could broaden their applications in various fields. We used polyvinyl alcohol (PVA) as the main component and added 2,4,6‐tri(4‐aminophenyl) triazine (TAPT) as a rigid fluorescent substance. We find that these hydrogels have higher strength than conventional PVA hydrogels. These hydrogels exhibit strong fluorescence. Hydrogen bonds and π‐π stacking between NH 2 and PVA construct the network structure. The composite hydrogel has significant mechanical properties, with a maximum tensile strength of 44.7 MPa, maximum elongation at break of 310.1% and Young's modulus of 138.5 MPa. Compared with the PVA hydrogel, the tensile strength and elongation at break of the hydrogel with the addition of 2% TAPT are increased by 292.6% and 153.0%, respectively. TAPT molecules are bound to the inside of the gel network, which makes the composite hydrogels have strong fluorescence. These hydrogels with high strength and fluorescence have a wide range of applications in flexible electronics and information displays.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v140.40
    DOI: 10.1002/app.54492
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1491105-X
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  • 4
    Online Resource
    Online Resource
    Enhanced piezoelectric property in Mn‐doped K 0.5 Na 0.5 NbO 3 ceramics via cold sintering process and KMnO 4 solution
    Wiley ; 2022
    In:  Journal of the American Ceramic Society Vol. 105, No. 9 ( 2022-09), p. 5774-5782
    Details
    In: Journal of the American Ceramic Society, Wiley, Vol. 105, No. 9 ( 2022-09), p. 5774-5782
    Abstract: Through mixing the KMnO 4 solution with K 0.5 Na 0.5 NbO 3 (KNN) powders, cold sintering process (CSP) was employed to fabricate high‐density Mn‐doped KNN green pellets and ceramics. The microstructure, doping effect of Mn and electrical properties of these ceramics were studied in detail. Compared with conventional sintering (CS), the CSP supports the homogeneity of dopants and then promotes grain growth and ceramic densification; thus the Mn‐doped KNN ceramics prepared by CSP show the obviously higher density and larger grain size. Besides, the less alkalis volatilization and oxygen vacancies result in more Mn 3+ but less Mn 4+ in CSP ceramics compared to CS ones, which endows the pinning effect and good poling characteristics in CSP ceramics. All the previous results contribute to the high dielectric constant and remnant polarization in CSP ceramics, which support the enhanced piezoelectric coefficient and are much superior than Mn‐doped KNN ceramics prepared by CS. This work reveals that CSP can be a new doping strategy to perform chemical modification of electrical properties in KNN ceramics.
    Type of Medium: Online Resource
    ISSN: 0002-7820 , 1551-2916
    URL: Issue
    URL: Article
    DOI: 10.1111/jace.v105.9
    DOI: 10.1111/jace.18537
    RVK:
    VA 1120
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2008170-4
    detail.hit.zdb_id: 219232-9
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  • 5
    Online Resource
    Online Resource
    Abnormal grain growth in (K, Na)NbO 3 ‐based lead‐free piezoceramic powders
    Wiley ; 2019
    In:  Journal of the American Ceramic Society Vol. 102, No. 2 ( 2019-02), p. 836-844
    Details
    In: Journal of the American Ceramic Society, Wiley, Vol. 102, No. 2 ( 2019-02), p. 836-844
    Abstract: Abnormal grain growth ( AGG ) is frequently observed in sintered (K, Na)NbO 3 ( KNN )‐based piezoceramics. However, in the present study, abnormal grain growth was unexpectedly discovered in calcined KNN ‐based powders. To explain the phenomenon, three well‐established models that account for the AGG in sintered ceramics were discussed, including (a) liquid‐phase‐assisted grain growth, (b) two‐dimensional nucleation grain growth, and (c) complexion coexistence. However, the AGG in calcined powders was concluded to be none of them, but a consequence of the A‐site compositional inhomogeneity in the K 2 CO 3 ‐Na 2 CO 3 ‐Nb 2 O 5 ternary system. Since repeated calcination and ball milling have low efficiency on solving AGG and the accompanied compositional inhomogeneity, abnormal grains were found to coexist with normal grains at a very high calcination temperature, that is, 1000°C. The compositional inhomogeneity is believed to be remaining even after sintering and consequently deteriorate the comprehensive performances, which might be a determinant for the unstable reproduction of KNN ‐based piezoceramics.
    Type of Medium: Online Resource
    ISSN: 0002-7820 , 1551-2916
    URL: Issue
    URL: Article
    DOI: 10.1111/jace.2019.102.issue-2
    DOI: 10.1111/jace.16070
    RVK:
    VA 1120
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2008170-4
    detail.hit.zdb_id: 219232-9
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  • 6
    Online Resource
    Online Resource
    Recyclable photoluminescent elastomer incorporating carboxyl‐functionalized fluorescent powder via dynamic covalent cross‐linking
    Wiley ; 2023
    In:  Polymer Composites Vol. 44, No. 8 ( 2023-08), p. 4842-4852
    Details
    In: Polymer Composites, Wiley, Vol. 44, No. 8 ( 2023-08), p. 4842-4852
    Abstract: The rapid development of photochromic devices has stimulated great enthusiasm for the design and preparation of luminescent materials. Introducing fluorescent powder ZnS:Cu into the cross‐linked polymer matrix is an efficient and simple method to obtain photochromic materials with excellent comprehensive performance. However, the traditional method is to directly introduce fluorescent powder into the polymer matrix by physical mixing. This not only increases the internal defects of the polymer and reduces the mechanical properties, but also hinders the fluorescent powder from absorbing external energy and reduces its luminescence efficiency. In addition, few studies have focused on recyclable photochromic luminescent materials. Inspired by dynamic covalent cross‐linking technology, this paper first modified fluorescent powder with 3‐mercaptopropionic acid and then introduced it into epoxy silicone rubber to prepare recyclable luminescent elastomer. Compared with traditional physical blending, the mechanical properties and luminescence performance of the covalently bonded luminescent elastomer were improved. Excellent mechanical properties and luminescence performance were maintained in multiple recycling processes. This paper provides a feasible and simple scheme for the preparation of recyclable luminescent elastomers, paving the way for the recycling and long‐term utilization of photochromic luminescent materials.
    Type of Medium: Online Resource
    ISSN: 0272-8397 , 1548-0569
    URL: Issue
    URL: Article
    DOI: 10.1002/pc.v44.8
    DOI: 10.1002/pc.27446
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1475935-4
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  • 7
    Online Resource
    Online Resource
    Robust Piezoelectricity with Spontaneous Polarization in Monolayer Tellurene and Multilayer Tellurium Film at Room Temperature for Reliable Memory
    Wiley ; 2022
    In:  Advanced Materials Vol. 34, No. 35 ( 2022-09)
    Details
    In: Advanced Materials, Wiley, Vol. 34, No. 35 ( 2022-09)
    Abstract: Robust neuromorphic computing in the Big Data era calls for long‐term stable crossbar‐array memory cells; however, the elemental segregation in the switch unit and memory unit that inevitably occurs upon cycling breaks the compositional and structural stability, making the whole memory cell a failure. Searching for a novel material without segregation that can be used for both switch and memory units is the major concern to fabricate robust and reliable nonvolatile cross‐array memory cells. Tellurium (Te) is found recently to be the only peculiar material without segregation for switching, but the memory function has not been demonstrated yet. Herein, apparent piezoelectricity is experimentally confirmed with spontaneous polarization behaviors in elementary 2D Te, even in monolayer tellurene (0.4 nm), due to the highly oriented polarization of the molecular structure and the non‐centrosymmetric lattice structure. A large memory window of 7000, a low working voltage of 2 V, and high on switching current up to 36.6 µA µm −1 are achieved in the as‐fabricated Te‐based memory device, revealing the great promise of Te for both switching and memory units in one cell without segregation. The piezoelectric Te with spontaneous polarization provides a platform to build robust, reliable, and high‐density logic‐in‐memory chips in neuromorphic computing.
    Type of Medium: Online Resource
    ISSN: 0935-9648 , 1521-4095
    URL: Issue
    URL: Article
    DOI: 10.1002/adma.v34.35
    DOI: 10.1002/adma.202204697
    RVK:
    UA 1538
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1474949-X
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