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Ultra-broadband microwave absorber and high-performance pressure sensor based on aramid nanofiber,polypyrrole and nickel porous aerogel

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1912-1921页

作者： Leyi Zhang Hongyu Jin Hanxin Liao Rao Zhang Bochong Wang Jianyong Xiang Congpu Mu Kun Zhai Tianyu Xue fusheng wen State Key Laboratory of Metastable Materials Science&Technology Yanshan UniversityQinhuangdao 066004China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Electronic devices have become ubiquitous in our daily lives,leading to a surge in the use of microwave absorbers and wearable sensor devices across various sectors.A prime example of this trend is the aramid nanofibers/polypyrrole/nickel(APN)aerogels,which serve dual roles as both microwave absorbers and pressure *** this work,we focused on the preparation of aramid nanofibers/polypyrrole(AP15)aerogels,where the mass ratio of aramid nanofibers to pyrrole was 1:*** employed the oxidative polymerization method for the preparation *** this,nickel was thermally evaporated onto the surface of the AP15 aerogels,resulting in the creation of an ultralight(9.35 mg·cm^(-3)).This aerogel exhibited a porous *** introduction of nickel into the aerogel aimed to enhance magnetic loss and adjust impedance matching,thereby improving electromagnetic wave absorption *** minimum reflection loss value achieved was-48.7 dB,and the maximum effective absorption bandwidth spanned 8.42 GHz with a thickness of 2.9 *** impressive metrics can be attributed to the three-dimensional network porous structure of the aerogel and perfect impedance ***,the use of aramid nanofibers and a three-dimensional hole structure endowed the APN aerogels with good insulation,flame-retardant properties,and compression *** under a compression strain of 50%,the aerogel maintained its resilience over 500 *** incorporation of polypyrrole and nickel particles further enhanced the conductivity of the ***,the final APN aerogel sensor demonstrated high sensitivity(10.78 kPa-1)and thermal *** conclusion,the APN aerogels hold significant promise as ultra-broadband microwave absorbers and pressure sensors.

关键词： porous aerogel aramid nanofibers microwave absorbers pressure sensor porous structure

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Robust enhancement of valley polarization and quantum yield in composition grading lateral heterostructure of MoS2-WS2 monolayer

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Progress in Natural Science:Materials International 2024年第1期34卷 187-193页

作者： Mengke Kang Cheng Zhang Congpu Mu Kun Zhai Tianyu Xue Bochong Wang fusheng wen Yingchun Cheng Jianyong Xiang Jun-Feng Dai Anmin Nie Zhongyuan Liu Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering

Valley degeneracy can be broken owing to the strong spin-orbit coupling in two-dimensional transition metal dichalcogenides（2D-TMDCs）. Valley-dependent interaction of carriers in TMDCs with different circular polarizations of light offers valley degree-of-freedom besides charge and spin to carry information. Thus, bandgap engineering of 2D-TMDCs plays a critical role in developing practical valleytronic devices. Hereby, we demonstrate a great enhancement in quantum yield as well as polarization of monolayer MoS2achieved by gradually alloying W atoms in MoS2. By appropriately setting a time offset between the evaporation of MoO3and WO3precursors during chemical vapor deposition, a compositionally graded heterostructure of MoS2-WS2monolayer can be readily grown at large scale. Raman and transmission electron microscopy measurements demonstrate that the interface possesses a steep gradient in composition, spanning from MoS2to WS2over a length ～2 μ*** to pure monolayer MoS2, the photoluminescence intensity at the compositionally graded interface of Mo1-xWxS2was observed to increase by a factor of 16 owing to the effective separation of photogenerated carriers by the built-in electric field. Particularly, a remarkably high polarization of 70% at 16 K is demonstrated for the compositionally graded interface of Mo1-xWxS2, which is ～1.4 times larger than that in MoS2and is attributed to the combined effect of the alloyed structure and graded bandgap. Such an engineering scheme with a graded bandgap offers new approach for the development of high-efficiency valleytronics devices.

关键词： Transition metal dichalcognide monolayer Compositionally graded in-plane heterostructure Chemical vapor deposition Valley polarization Quantum yield

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Composites of In/C hexagonal nanorods and graphene nanosheets for high-performance electromagnetic wave absorption

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 485-493页

作者： Rao Zhang Congpu Mu Bochong Wang Jianyong Xiang Kun Zhai Tianyu Xue fusheng wen State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Microstructure Materials Physics School of ScienceYanshan UniversityQinhuangdao 066004China

In recent years,electromagnetic wave(EMW)absorption has been extensively investigated for solving EMW radiation and *** metal-organic frameworks(MOFs)have attracted attention due to their low density and unique structure,which can meet the requirements of strong reflection loss(RL)and wide absorption bandwidth of EMW absorption *** this manuscript,indium nanoparticles/porous carbon(In/C)nanorods composites were prepared via the pyrolysis of nanorods-like In-MOFs at a low temperature of450°*** nanoparticles are evenly attached and embedded on porous *** electrical conductivity of In/C nanorods is unfavorable to EMW absorption performance,which is due to the low temperature ***,graphene(Gr)nanosheets with high electrical conductivity are introduced to adjust electromagnetic parameters of In/C nanorods for enhancing EMW *** minimum RL of the In/C-Gr-4 composite is up to-43.7 dB with a thin thickness of 1.30 *** addition,when the thickness is further reduced to 1.14 mm,the minimum RL of-39.3 dB at 16.1 GHz and effective absorption bandwidth of 3.7 GHz(from 14.3 to 18.0 GHz)can be *** work indicates that In/C-Gr composites show excellent EMW absorption performance.

关键词： electromagnetic wave absorption metal-organic frameworks indium nanoparticles nanorod graphene permittivity

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Broadband light absorption and photoresponse enhancement in monolayer WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators

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Nano Research 2022年第5期15卷 4653-4660页

作者： Kun Ye Lixuan Liu Congpu Mu Kun Zhai Shiliang Guo Bochong Wang Anmin Nie Shuhan Meng fusheng wen Jianyong Xiang Tianyu Xue Ming Kang Yongji Gong Yongjun Tian Zhongyuan Liu Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science&TechnologyYanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Microstructure Materials Physics School of ScienceYanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Electrical Engineering Yanshan UniversityQinhuangdao 066004China College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China

Monolayer(1L)transition metal dichalcogenides(TMDCs)have been attracting tremendous interest in recent years as promising candidate materials in atomic-scale optoelectronic devices due to their direct band gaps(1.5-2.2 eV)and strong light-matter ***,their practical applications are limited by low visible light absorption stemming from atomic thickness and negligible infrared ***,we report the triangular Sb_(2)O_(3) microresonators in wide thickness and lateral size distributions grown on 1L TMDCs and their created significant broadband enhancement of light adsorption and photoresponse in 1L WSe_(2) crystal via coexisting Fabry-Perot and whispering gallery type *** an example of demonstration,1L WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators with widely distributed sizes exhibits the enhanced visible light absorption by up to 5 folds and the simultaneously extended near infrared(NIR)one of more than 50%.For application of 1L WSe_(2) in photodetection,incorporation of Sb2O3 microresonators leads to significantly enhanced visible light responsivity by~10^(4) order and expanded NIR one of more than 400 mA·W^(-1).Similar results have been observed in the other 1L W(Mo)dichalcogenides coupled to Sb2O3 *** work provides a new route for development of the high-performance monolayer TMDCs-based optoelectronic devices.

关键词： transition metal dichalcogenides Sb_(2)O_(3)optical microresonator photodetectors enhanced absorption broad bandwidth

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Mechanical Behavior and Microstructure Evolution during Tensile Deformation of Twinning Induced Plasticity Steel Processed by Warm Forgings

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 417-424页

作者：王文 ZHAO Modi WANG Xingfu 汪聃韩福生 School of Aerospace and Mechanical Engineering Flight College Changzhou Institute of TechnologyChangzhou 213032China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China School of Physics and Electronic Information Yan’an UniversityYan’an 716000China

The mechanical behavior and microstructural evolution of an Fe-30Mn-3Al-3Si twinninginduced plasticity(TWIP)steel processed using warm forging was *** is found that steel processed via warm forging improves comprehensive mechanical properties compared to the TWIP steel processed via cold rolling,with a high tensile strength(R_(m))of 793 MPa,a yield strength(R_(P))of 682 MPa,an extremely large R_(P)/R_(m)ratio as high as 0.86 as well as an excellent elongation rate of 46.8%.The microstructure observation demonstrates that steel processed by warm forging consists of large and elongated grains together with fine,equiaxed *** micro-defect configurations were also observed within the steel,including dense dislocation networks and a few coarse deformation *** the plastic deformation proceeds,the densities of dislocations and deformation twins significantly ***,a great number of slip lines could be observed in the elongated *** findings reveal that a much more dramatic interaction between microstructural defect and dislocations glide takes place in the forging sample,wherein the fine and equiaxed grains propagated dislocations more rapidly,together with initial defect configurations,are responsible for enhanced strength ***,larger,elongated grains with more prevalently activated deformation twins result in high plasticity.

关键词： TWIP steel twinning mechanical property deformation mechanism microstructure

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Microwave Synthesized In2S3@CNTs with Excellent Properties in Lithium-Ion Battery and Electromagnetic Wave Absorption

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Chinese Journal of Chemistry 2018年第2期36卷 157-161页

作者： Cong Wang Congpu Mu Jianyong Xiang Bochong Wang Can Zhang Jiefang Song fusheng wen State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao Hebei 066004 China Hebei Key Laboratory of Microstructure Material Physics Yanshan University Qinhuangdao Hebei 066004 China

The three-dimensional nanoflower-like β-In2S3 composited with carbon nanotubes {CNTs） has been synthesized by a single mode micro- wave-assisted hydrothermal technique. The In2S3 and CNTs nanocomposites （In2S3@CNTs） were investigated as the anode materials of lithium batteries （LIBs） and the electromagnetic wave absorption materials. For LIBs applications, the In2S3@CNTs nanocomposite exhibited excellent cycling stability with a high reversible charge capacity of 575 mA·h·g-1 after 300 cycles at 0.S A·g^-1, In addition, the In2S3@CNTs used as electromagnetic wave absorber displayed a maximum reflection loss of-42.75 dB at 11.96 GHz with a thickness of 1.55 ram.

关键词： In2S3 carbon nanotubes lithium ion batteries electromagnetic wave absorption hydrothermal

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Broadband photodetector of high quality Sb2S3 nanowire grown by chemical vapor deposition

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Journal of Materials Science & Technology 2021年第16期75卷 14-20页

作者： Kun Ye Bochong Wang Anmin Nie Kun Zhai fusheng wen Congpu Mu Zhisheng Zhao Jianyong Xiang Yongjun Tian Zhongyuan Liu Center for High Pressure Science State Key Laboratory of Metastable Materials Science & Technology Yanshan University Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University

Low dimensional semiconductors can be used for various electronic and optoelectronic devices because of their unique structure and property. In this work, one-dimensional SbSnanowires(NWs) with high crystallinity were grown via chemical vapor deposition(CVD) technique on SiO/Si substrates. The SbSNWs exhibited needle-like structures with inclined cross-sections. The lengths of SbSnanowires changed from 7 to 13 μm. The photodetection properties of SbSnanowires were comprehensively and systematically characterized. The SbSphotodetectors show a broadband photoresponse ranging from ultraviolet(360 nm) to near-infrared(785 nm). An excellent specific detectivity of 2.1 × 101~4 Jones, high external quantum efficiency of 1.5 × 10~4%, sensitivity of 2.2 × 104 cm~2 Wand short response time of less than 100 ms was achieved for the SbSNW photodetectors. Moreover, the SbSNWs showed outstanding switch cycling stability that was beneficial to the practical applications. The high-quality SbSnanowires fabricated by CVD have great application potential in semiconductor and optoelectronic fields.

关键词： Sb 2 S 3 nanowires Photodetector Chemical Vapor Deposition

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混凝土环境中GFRP筋性能衰退的规律及机理

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建筑材料学报 2023年第2期26卷 156-162页

作者：李文超周广发温福胜刘福胜焦裕钊泰山学院机械与建筑工程学院山东泰安271000 山东农业大学水利土木工程学院山东泰安271018 水发规划建设有限公司山东济南250100 山东斯福特实业有限公司山东泰安271000

为了探究玻璃纤维增强复合材料(GFRP)筋在模拟和真实混凝土环境中性能衰退的规律及机理,设置了碱溶液(AS)和混凝土包裹GFRP筋后置于自来水中(CS)2种侵蚀环境,采用短梁剪切法分析了GFRP筋力学性能的衰退规律,并借助扫描电子显微镜、差示... 详细信息

为了探究玻璃纤维增强复合材料(GFRP)筋在模拟和真实混凝土环境中性能衰退的规律及机理,设置了碱溶液(AS)和混凝土包裹GFRP筋后置于自来水中(CS)2种侵蚀环境,采用短梁剪切法分析了GFRP筋力学性能的衰退规律,并借助扫描电子显微镜、差示扫描量热法分析了GFRP筋的微观结构和玻璃化转变温度(T_(g)).结果表明:随着温度的升高,GFRP筋层间剪切强度衰退的速率加快;GFRP筋在60℃的AS中老化183 d后层间剪切强度保留了48.6%,T_(g)降低了9.2%,部分纤维与树脂脱黏,树脂出现孔洞;相同条件下CS中GFRP筋的层间剪切强度保留了61.4%,T_(g)降低了3.4%,纤维产生浅坑.基于Arrhenius方程建立了北京地区GFRP筋的性能预测模型.

关键词：玻璃纤维增强复合材料筋混凝土环境微观结构玻璃化转变温度预测模型

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层状硫掺杂黑磷晶体的高频电磁性能

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硅酸盐学报 2022年第2期50卷 285-289页

作者：王博翀郝春雪常玉凯牟从普温福昇柳忠元高压科学研究中心亚稳材料制备技术与科学国家重点实验室燕山大学河北秦皇岛066004 河北省微结构材料物理重点实验室燕山大学理学院河北秦皇岛066004

电子设备的增多使得吸波材料在军事和民用领域具有广泛的应用。当前研究的重点在于制备吸收强、频带宽、质量轻、厚度薄的新型吸波材料。利用高温高压成功合成黑磷(BP)和硫掺杂黑磷(BP-S)晶体,并使用液相剥离的方法制备BP和BP-S纳米片... 详细信息

电子设备的增多使得吸波材料在军事和民用领域具有广泛的应用。当前研究的重点在于制备吸收强、频带宽、质量轻、厚度薄的新型吸波材料。利用高温高压成功合成黑磷(BP)和硫掺杂黑磷(BP-S)晶体,并使用液相剥离的方法制备BP和BP-S纳米片。高频电磁参数测量发现相较于BP,硫元素的掺杂使得BP-S复数介电常数和介电损耗正切值在频率1.0~16.5 GHz情况下明显提高。BP-S在9.6 GHz处最小反射损耗可达到–41.1 dB;当厚度在1.0~2.0 mm范围内变化时,小于–10 dB的反射损耗频率范围为7.0~16.1 GHz。BP-S的最小反射损耗频率点与材料厚度符合λ/4阻抗匹配模型。综上,层状硫掺杂黑磷作为高性能介电损耗吸波材料具有广阔的应用前景。

关键词：黑磷吸波材料高温高压硫掺杂高频电磁性能

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安全农产品认知影响产品和渠道选择的差异研究——基于消费认知行为模型的分析

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北京工商大学学报（社会科学版） 2017年第1期32卷 50-60页

作者：古川曾福生刘雯湖南农业大学湖南长沙410128 北京市农村经济研究中心北京100029

分析安全农产品认知对消费决策影响程度的差别以及在不同组群的差异,对于提高农产品市场的质量安全水平有重要意义。文章通过问卷调查了754位具有基本安全农产品认知的消费者,基于消费认知行为模型和倾向得分匹配法,分析了安全农产品认... 详细信息

分析安全农产品认知对消费决策影响程度的差别以及在不同组群的差异,对于提高农产品市场的质量安全水平有重要意义。文章通过问卷调查了754位具有基本安全农产品认知的消费者,基于消费认知行为模型和倾向得分匹配法,分析了安全农产品认知对消费者产品和渠道选择的影响程度的差异。实证研究发现:高安全农产品认知对现代流通渠道选择的影响程度,强于对产品选择的影响程度,并且各组群之间的影响程度也有较大差别。整体来说,具备高认知的消费者,不会更加信任认证农产品,对待产品安全性的态度也更加中性,但是,选择直销渠道的意愿更强,尝试网络购买的更多。按年龄和学历划分消费者组群后发现,40岁以下组群和专科及以下学历的组群显著地信任认证产品,40岁及以上和本科及以上学历的消费者则没有显著地对认证产品表现出信任;30~39岁组群和本科学历组群,相较其他组群会更显著地重视农产品安全属性;40~49岁组群和本科学历组群显著地愿意选择直销渠道,其他组群则鲜有表现出显著的意愿;30岁以下组群和研究生学历组群会更多地尝试网络购买,其他年龄段和学历层次则没有显著的网购倾向。最后,文章建议在发展安全农产品市场时,要更重视现代农产品流通渠道建设。

关键词：安全农产品认知农产品属性农产品渠道倾向得分匹配(PSM) 消费者认知行为模型网络购买

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