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学者姓名：任巍
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Abstract ：
Lead-free piezoelectric 0.92(K0.445Na0.5Li0.05)NbO3-0.08BaZrO(3) (KNLN-BZ) ceramics were prepared via conventional sintering. Single-step, 2-step and 3-step temperature-controlled conditions were designed. The structure and electrical properties of ceramics obtained using different temperature-controlled procedures were systematically studied. It was found that ceramic prepared using the 3-step method with a holding time of 20 h showed the highest electrical properties. The Curie temperature was approximately 286 degrees C, and the dielectric constant and dielectric loss at room temperature were 1350 and 4.5% at the frequency of 1 kHz, respectively. The highest remanent polarization, piezoelectric strain and piezoelectric coefficient, d(33)*, were obtained 60 degrees C, indicating a phase transition between ferroelectric phases. Although the ceramics did not show excellent piezoelectric properties, the 3-step sintering method can be considered an effective method to optimize the electrical performances of KNN-based ceramics. Combined with an appropriate composition, ceramics with excellent electrical properties could be obtained. This study provides a path to enhance the density and electrical properties for KNN-based ceramics with simple composition and potential for industry application.
Keyword ：
KNLN-BZ lead-free piezoelectric ceramics sintering process thermal stability
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| GB/T 7714 | Tang, Yan , Wang, Lingyan , Ren, Wei et al. Effect of Sintering Conditions on the Electrical Properties of Lead-Free Piezoelectric Potassium Sodium Niobate-Based Ceramics [J]. | CRYSTALS , 2022 , 12 (12) . |
| MLA | Tang, Yan et al. "Effect of Sintering Conditions on the Electrical Properties of Lead-Free Piezoelectric Potassium Sodium Niobate-Based Ceramics" . | CRYSTALS 12 . 12 (2022) . |
| APA | Tang, Yan , Wang, Lingyan , Ren, Wei , Quan, Yi , Zhao, Jinyan , Wang, Zhe et al. Effect of Sintering Conditions on the Electrical Properties of Lead-Free Piezoelectric Potassium Sodium Niobate-Based Ceramics . | CRYSTALS , 2022 , 12 (12) . |
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Abstract ：
The transfer of large-area and clean graphene to arbitrary substrates, especially to those with raised nanostructures, represents a great challenge. Polymer-based supporting layers generally lead to organic residues, while graphene transfer using alternative supporting materials like paraffin suffers from breaking and thus limits the transfer area. We demonstrated an improved poly(methyl methacrylate) (PMMA)/parallin double layer, enabling the large-area transfer of graphene with high cleanliness and high coverage (81%) onto gold nanopyramid (AuNP)-structured substrates. The impact of supporting layers including single PNINIA or paraffin and mixed PMMA/paraffin was clarified. The properties of graphene on AuNPs were theoretically and experimentally examined in detail. Raman spectra show a polarization-dependent D peak due to the folding of large-curvature graphene. The graphene on AuNPs shows a slightly tensile strain and provides extra surface-enhanced Raman scattering (SERS) with an enhancement factor of similar to 20 times. These findings open a pathway to extend the applications of transferred graphene on raised nanostructures in many fields, such as SERS detection, catalysis, biosensors, light-emitting diodes, solar cells, and advanced transparent conductors.
Keyword ：
gold nanopyramid graphene transfer PMMA/paraffin polarization-dependent Raman spectroscopy tensile strain
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| GB/T 7714 | Wu, Heping , Niu, Gang , Ren, Wei et al. Large-Area and Clean Graphene Transfer on Gold-Nanopyramid-Structured Substrates: Implications for Surface-Enhanced Raman Scattering Detection [J]. | ACS APPLIED NANO MATERIALS , 2022 , 5 (3) : 3878-3888 . |
| MLA | Wu, Heping et al. "Large-Area and Clean Graphene Transfer on Gold-Nanopyramid-Structured Substrates: Implications for Surface-Enhanced Raman Scattering Detection" . | ACS APPLIED NANO MATERIALS 5 . 3 (2022) : 3878-3888 . |
| APA | Wu, Heping , Niu, Gang , Ren, Wei , Yang, Zhugen , Xu, Qihang , Dai, Liyan et al. Large-Area and Clean Graphene Transfer on Gold-Nanopyramid-Structured Substrates: Implications for Surface-Enhanced Raman Scattering Detection . | ACS APPLIED NANO MATERIALS , 2022 , 5 (3) , 3878-3888 . |
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Acoustic tweezers for microparticle non-contact manipulation have attracted attention in the biomedical engineering field. The key components of acoustic tweezers are piezoelectric materials, which convert electrical energy to mechanical energy. The most widely used piezoelectric materials are lead-based materials. Because of the requirement of environmental protection, lead-free piezoelectric materials have been widely researched in past years. In our previous work, textured lead-free (K, Na)NbO3 (KNN)-based piezoelectric ceramics with high piezoelectric performance were prepared. In addition, the acoustic impedance of the KNN-based ceramics is lower than that of lead-based materials. The low acoustic impedance could improve the transmission efficiency of the mechanical energy between acoustic tweezers and water. In this work, acoustic tweezers were prepared to fill the gap between lead-free piezoelectric materials research and applications. The tweezers achieved 13 MHz center frequency and 89% -6 dB bandwidth. The -6 dB lateral and axial resolution of the tweezers were 195 mu m and 114 mu m, respectively. Furthermore, the map of acoustic pressure measurement and acoustic radiation calculation for the tweezers supported the trapping behavior for 100 mu m diameter polystyrene microspheres. Moreover, the trapping and manipulation of the microspheres was achieved. These results suggest that the KNN-based acoustic tweezers have a great potential for further applications.
Keyword ：
acoustic tweezer lead-free non-contact manipulation piezoelectric textured ceramics ultrasound
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| GB/T 7714 | Quan, Yi , Fei, Chunlong , Ren, Wei et al. Single-Beam Acoustic Tweezer Prepared by Lead-Free KNN-Based Textured Ceramics [J]. | MICROMACHINES , 2022 , 13 (2) . |
| MLA | Quan, Yi et al. "Single-Beam Acoustic Tweezer Prepared by Lead-Free KNN-Based Textured Ceramics" . | MICROMACHINES 13 . 2 (2022) . |
| APA | Quan, Yi , Fei, Chunlong , Ren, Wei , Wang, Lingyan , Zhao, Jinyan , Zhuang, Jian et al. Single-Beam Acoustic Tweezer Prepared by Lead-Free KNN-Based Textured Ceramics . | MICROMACHINES , 2022 , 13 (2) . |
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Abstract ：
Lead-free bismuth sodium titanite, (Bi0.5Na0.5)TiO3 (BNT)-based piezoelectric thin films have enormous potential in applications such as micro-actuators and micro-ultrasonic transducers due to their large strain responses. In this paper, (1 - x)(Bi0.5Na0.5)TiO3-xBaZrO(3) (x = 0.02, 0.04, 0.06 and 0.07, BNT-100xBZ) piezoelectric thin films were deposited on Pt/TiO2/SiO2/Si (001) substrates by sol-gel method. All BNT-100xBZ thin films showed good macro-morphology and crystallinity. In addition, no clear phase structure transition was observed by increasing the BZ contents in the BNT-100xBZ solution, which, however, leads to evident variations in the dielectric and piezoelectric properties of the BNT-100xBZ thin films. A giant macro-scale strain value of 1.31% was obtained in the BNT-4BZ thin films, accompanied by a relatively lower dielectric loss of 0.03 for all BNT-100xBZ thin films. According to temperature- and frequency-dependent dielectric properties, it is found that the BNT-4BZ composition has a coexistence of ferroelectric phase and relaxor characteristics, which is different from other compositions. Furthermore, the intensity of the current peak related to the domain switching in the BNT-4BZ thin films is higher than that of other compositions. This work is of great interest for further enhancement of the strain response and reduction of the dielectric loss in BNT-based lead-free thin films for various piezoelectric device applications like micro-actuator systems.
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| GB/T 7714 | Wang, Zhe , Zhao, Jinyan , Niu, Gang et al. Giant strain responses and relaxor characteristics in lead-free (Bi0.5Na0.5)TiO3-BaZrO3 ferroelectric thin films [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (19) : 7449-7459 . |
| MLA | Wang, Zhe et al. "Giant strain responses and relaxor characteristics in lead-free (Bi0.5Na0.5)TiO3-BaZrO3 ferroelectric thin films" . | JOURNAL OF MATERIALS CHEMISTRY C 10 . 19 (2022) : 7449-7459 . |
| APA | Wang, Zhe , Zhao, Jinyan , Niu, Gang , Ren, Wei , Zhang, Nan , Zheng, Kun et al. Giant strain responses and relaxor characteristics in lead-free (Bi0.5Na0.5)TiO3-BaZrO3 ferroelectric thin films . | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (19) , 7449-7459 . |
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Abstract ：
Surface-enhanced Raman spectroscopy (SERS) has attracted enormous interests as a biological sensing technique. However, the wide application of SERS technique suffers from the limitation of sensitivity, uniformity and universality for the analytes. Herein, a graphene-nanopyramids hybrid SERS system with high uniformity and sensitivity was used to label-freely detect analytes at different scales. Colloidal lithography and modern semiconductor nanofabrication process were employed for the fabrication of wafer-scale highly-ordered array of Au nanopyramids, which ensures the uniformity of the system. The graphene layer not only plays a role of biology-compatible supporting layer for analytes but also further enhances the Raman signals and facilitates the quantitative analysis capability of the hybrid system as an intensity gauge. For nanoscale chemical and protein molecules including Rhodamine 6G (R6G), methylene blue (MB), catalase and lysozyme with concentrations lower than 10(-10) M, clear SERS signals can be obtained with analytical enhancement factors (EFs) of similar to 10(9) for R6G and MB. For micron-scale analytes, Raman fingerprints of cells, i.e. erythrocyte and leukocyte have been obtained. Moreover, using statistical principal component analysis method, one can easily distinguish different analytes based on their Raman fingerprints. The experiment results of EF are in good agreement with the theoretical values predicted by finite-difference time-domain simulation. Such a wafer-scale, highly uniform and universal system will certainly enable the wider application of SERS in multiscale label-free detection of chemicals, proteins and cells, etc. with high sensitivity and specificity.
Keyword ：
Graphene Highly uniform and sensitive Large scale Surface-enhanced Raman spectroscopy Universal biological detection
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| GB/T 7714 | Wu, Heping , Niu, Gang , Ren, Wei et al. Highly sensitive label-free detection of analytes at different scales using uniform graphene-nanopyramids hybrid SERS system [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2022 , 354 . |
| MLA | Wu, Heping et al. "Highly sensitive label-free detection of analytes at different scales using uniform graphene-nanopyramids hybrid SERS system" . | SENSORS AND ACTUATORS B-CHEMICAL 354 (2022) . |
| APA | Wu, Heping , Niu, Gang , Ren, Wei , Jiang, Luyue , Zhao, Jinyan , Quan, Yi et al. Highly sensitive label-free detection of analytes at different scales using uniform graphene-nanopyramids hybrid SERS system . | SENSORS AND ACTUATORS B-CHEMICAL , 2022 , 354 . |
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Abstract ：
Multiferroic materials have attracted much interest in the last decade due to both the intriguing fundamental science and the potential applications in spintronics and magnetoelectric data storage devices. In this work, we have investigated and discussed the evolution of the magnetic properties of the multiferroic (1-x)Pb(Fe-2/3 W-1/3)O-3-xBiFeO(3) solid solution ((1-x)PFW-xBFO, x = 0, 0.025, 0.05, 0.075, 0.1 and 0.15). The magnetic phase diagram is established based on the magnetic measurement results, which reveals six magnetically ordered states on the PFW-rich side of the solid solution. The origins of the complex evolution of magnetic order in the PFW-BFO solid solution are discussed from the point view of the variations in both the -Fe-O-Fe- and -Fe-O-W-O-Fe- superexchange routes, which are intimately related to the ratio of magnetic Fe3+ ion concentration on the B-site and the changes in the local structural order/disorder and chemical homogeneities. Combining the magnetic phase diagram with the relaxor characteristic phase diagram of the (1-x)PFW-xBFO system, a striking feature is found that the ergodic relaxor (ER) state and the weakly ferromagnetic phase coexist in the composition range of 0.025 <= x <= 0.1 between the freezing temperature T-f and the Burns temperature T-B.
Keyword ：
magnetic ordering and properties magnetic phase diagram magnetic relaxor Pb(Fe2/3W1/3)O-3-BiFeO3 solid solution single-phase multiferroic
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| GB/T 7714 | Li, Haijuan , Zhuang, Jian , Bokov, Alexei A. et al. Evolution of magnetic order in multiferroic Pb(Fe2/3W1/3)O-3-BiFeO3 solid solution [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2021 , 104 (9) : 4585-4593 . |
| MLA | Li, Haijuan et al. "Evolution of magnetic order in multiferroic Pb(Fe2/3W1/3)O-3-BiFeO3 solid solution" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 104 . 9 (2021) : 4585-4593 . |
| APA | Li, Haijuan , Zhuang, Jian , Bokov, Alexei A. , Zhang, Nan , Zhang, Jie , Ren, Wei et al. Evolution of magnetic order in multiferroic Pb(Fe2/3W1/3)O-3-BiFeO3 solid solution . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2021 , 104 (9) , 4585-4593 . |
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Abstract ：
A novel and efficient enzymatic glucose sensor was fabricated based on Fe3O4 magnetic nanoparticles (Fe(3)O(4)MNPs)-modified urchin-like ZnO nanoflowers (ZnONFs). ZnONFs were hydrothermally synthesizing on a flexible PET substrate. Fe(3)O(4)MNPs were deposited on the surface of the ZnONFs by the drop-coating process. The results showed that the urchin-like ZnONFs provided strong support for enzyme adsorption. For Fe(3)O(4)MNPs, it significantly promoted the redox electron transfer from the active center of GOx to the ZnO nanoflowers beneath. More importantly, it promoted the hydrolysis of H2O2, the intermediate product of glucose catalytic reaction, and thus improved the electron yield. The sensitivity of the Nafion/GOx/Fe(3)O(4)MNPs/ZnONFs/Au/PET sensor was up to 4.52 mu A center dot mM(-1)center dot cm(-2), which was improved by 7.93 times more than the Nafion/GOx/ZnONFs/Au/PET sensors (0.57 mu A center dot mM(-1)center dot cm(-2)). The detection limit and linear range were also improved. Additionally, the as-fabricated glucose sensors show strong anti-interference performance in the test environment containing organic compounds (such as urea, uric acid, and ascorbic acid) and inorganic salt (for instance, NaCl and KCl). The glucose sensor's service life was evaluated, and it can still maintain about 80% detection performance when it was reused about 20 times. Compared with other existing sensors, the as-fabricated glucose sensor exhibits an ultrahigh sensitivity and wide detection range. In addition, the introduction of Fe(3)O(4)MNPs optimized the catalytic efficiency from the perspective of the reaction mechanism and provided potential ideas for improving the performance of other enzymatic biosensors.
Keyword ：
electrochemical sensor enzymatic glucose sensor enzyme Fe3O4 magnetic nanoparticles ZnO nanoflowers
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| GB/T 7714 | Mao, Qi , Jing, Weixuan , Gao, Weizhuo et al. High-Sensitivity Enzymatic Glucose Sensor Based on ZnO Urchin-like Nanostructure Modified with Fe3O4 Magnetic Particles [J]. | MICROMACHINES , 2021 , 12 (8) . |
| MLA | Mao, Qi et al. "High-Sensitivity Enzymatic Glucose Sensor Based on ZnO Urchin-like Nanostructure Modified with Fe3O4 Magnetic Particles" . | MICROMACHINES 12 . 8 (2021) . |
| APA | Mao, Qi , Jing, Weixuan , Gao, Weizhuo , Wei, Zhengying , Tian, Bian , Liu, Ming et al. High-Sensitivity Enzymatic Glucose Sensor Based on ZnO Urchin-like Nanostructure Modified with Fe3O4 Magnetic Particles . | MICROMACHINES , 2021 , 12 (8) . |
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Abstract ：
Magnetoelectric (ME) composites of bulk structures show strong ME coupling performance, and thus magnetoelectric bulk composites and their related devices have been attracting increasing attention over the last few years. Two kinds of ME coupling mechanisms can be found in ME bulk composites, i.e., direct ME coupling and converse ME coupling, where electric field control of magnetization or magnetic field control of ferroelectric polarization can be achieved. Then, ultra-fast, low-power, and miniaturized electronics can be developed based on the novel functionalities of both direct and converse ME coupling effects. Direct ME coupling is used in devices such as ME sensors and energy harvesters, while converse ME coupling is used in voltage tunable inductors, bandstop filters, ME antennas, tunable resonators, etc. Here, we present a review of bulk structure ME composite materials, as well as some notable potential applications of ME composites, with emphasis on both the opportunities and challenges for the application of ME composites. The performance of ME bulk composites, their coupling structures, state-of-the-art device applications, and perspectives on direct (magnetic to electric) and converse (electric to magnetic) ME devices are summarized.
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| GB/T 7714 | Mao, Qi , Wu, Jingen , Hu, Zhongqiang et al. Magnetoelectric devices based on magnetoelectric bulk composites [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (17) : 5594-5614 . |
| MLA | Mao, Qi et al. "Magnetoelectric devices based on magnetoelectric bulk composites" . | JOURNAL OF MATERIALS CHEMISTRY C 9 . 17 (2021) : 5594-5614 . |
| APA | Mao, Qi , Wu, Jingen , Hu, Zhongqiang , Xu, Yiwei , Du, Yongjun , Hao, Yuanbo et al. Magnetoelectric devices based on magnetoelectric bulk composites . | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (17) , 5594-5614 . |
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Bismuth calcium tantalate (CaBi2Ta2O9) ferroelectric ceramic has not been studied adequately though it shows potential applications in high-temperature piezoelectric devices due to its ultrahigh Curie temperature (T-C similar to 929 degrees C). In this paper, (Li0.5Pr0.5) co-substitution at A site was proposed to increase piezoelectricity activity (d(33)) and electrical resistivity (rho) of CaBi2Ta2O9-based ceramics and thereby a study of effect of the co-substitution on their structure and electrical properties was conducted. The composition Ca1-x(Li0.5Pr0.5)(x)Bi2Ta2O9+delta for x= 0.04 shows the highest d(33) of 15.1 pC/N which is about twice than that of CaBi2Ta2O9. At 700 degrees C, rho of this composition reaches up to 1.5 M Omega cm and hence the dielectric loss (tan delta) is lower than 3%. These results combined with high T-C (similar to 925 degrees C) and stable d(33) (up to 800 degrees C), suggest that it is a very promising material for high-temperature piezoelectric applications at 700 degrees C or higher. (C) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
Keyword ：
CaBi2Ta2O9-based piezoelectric ceramics Electrical resistivity (Li0.5Pr0.5) co-substitution Piezoelectric property Ultrahigh Curie temperature
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| GB/T 7714 | Long, Changbai , Zhou, Wenjie , Ren, Wei et al. Enhanced piezoelectric properties and high electrical resistivity in (Li0.5Pr0.5) co-substituted bismuth calcium tantalate (CaBi2Ta2O9) ceramics [J]. | SCRIPTA MATERIALIA , 2021 , 204 . |
| MLA | Long, Changbai et al. "Enhanced piezoelectric properties and high electrical resistivity in (Li0.5Pr0.5) co-substituted bismuth calcium tantalate (CaBi2Ta2O9) ceramics" . | SCRIPTA MATERIALIA 204 (2021) . |
| APA | Long, Changbai , Zhou, Wenjie , Ren, Wei , Zhang, Yijun , Zheng, Kun , Liu, Laijun . Enhanced piezoelectric properties and high electrical resistivity in (Li0.5Pr0.5) co-substituted bismuth calcium tantalate (CaBi2Ta2O9) ceramics . | SCRIPTA MATERIALIA , 2021 , 204 . |
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Single-phase multiferroic BiFeO3-based perovskite solid solutions attract great research interest due to the coexistence of ferroelectric and magnetic orderings above room temperature. In this work, the single crystals of the 0.5(Bi0.9Dy0.1)FeO3-0.5PbTiO(3) ternary system are successfully grown and their structure and ferroic properties are characterized by a variety of techniques. X-ray diffraction reveals the tetragonal crystal structure. The ferroelectric Curie temperature is found to be approximate to 670 K from the dielectric and thermal measurements. The domain structures on multiple scales are investigated by polarized light and atomic force and piezoresponse force microscopies on the 001 orientated single crystals. Hierarchical domain configurations are revealed and explained based on the mechanical/electrical compatibility principles. The a-a- and a-c-type 90 degrees domains are widely distributed with size from sub-micrometer to dozens of micrometers. The domain evolutions after poling with various applied electric fields have also been investigated. Saturated ferroelectric hysteresis loops are obtained at room temperature with a remanent polarization of 9.0 mu C/cm(2). The Mossbauer spectroscopy investigations demonstrate the multiple local states of magnetic Fe3+ ions. The room-temperature paramagnetic nature develops into an antiferromagnetic order at T-N = 55 K. The findings of multiferroic domain walls give rise to the Dy-BFPT single-crystal potential for the domain wall nanoelectronics.
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| GB/T 7714 | Tang, Zhuohua , Zhuang, Jian , Bokov, Alexei A. et al. Multiscale Domain Structures and Ferroic Properties of Dy-Modified BiFeO3-PbTiO3 Single Crystals [J]. | CRYSTAL GROWTH & DESIGN , 2021 , 21 (5) : 3082-3092 . |
| MLA | Tang, Zhuohua et al. "Multiscale Domain Structures and Ferroic Properties of Dy-Modified BiFeO3-PbTiO3 Single Crystals" . | CRYSTAL GROWTH & DESIGN 21 . 5 (2021) : 3082-3092 . |
| APA | Tang, Zhuohua , Zhuang, Jian , Bokov, Alexei A. , Luo, Zeng , Kubrin, Stanislav P. , Raevski, Igor P. et al. Multiscale Domain Structures and Ferroic Properties of Dy-Modified BiFeO3-PbTiO3 Single Crystals . | CRYSTAL GROWTH & DESIGN , 2021 , 21 (5) , 3082-3092 . |
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