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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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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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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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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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Photoemission oscillation in epitaxially grown van derWaalsβ-In_(2)Se_(3)/WS_(2) heterobilayer bubbles

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Chinese Physics B 2021年第11期30卷 597-603页

作者： Jiyu Dong Kang Lin Congpu Mu Zhiyan Jia Jin Xu Anmin Nie bochong wang Jianyong Xiang Fusheng Wen Kun Zhai Tianyu Xue Zhongyuan Liu Center for High Pressure Science CHiPS State Key Laboratory of Metastable Materials Science&TechnologyYanshan UniversityQinhuangdao 066004China Key Laboratory of Microstructure Materials Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Thin films of millimeter-scale continuous monolayer WS_(2) have been grown on SiO_(2)/Si substrate,followed by the deposition ofβ-In_(2)Se_(3) crystals on monolayer WS2 to prepare In_(2)Se_(3)/WS_(2) van deWaals heterostructures by a two-step chemical vapor deposition(CVD)*** the growth of In_(2)Se_(3) at elevated temperatures,high densities of In_(2)Se_(3)/WS_(2) heterostructure bubbles with monolayer to multilayerβ-In_(2)Se_(3) crystals atop are *** of the resultantβ-In_(2)Se_(3)/WS_(2) heterostructure is greatly enhanced in intensity upon the formation of bubbles,which are evidenced by the Newton’s rings in optical image owing to constructive and destructive *** photoluminescence(PL)mapping images of monolayerβ-In_(2)Se_(3)/monolayer WS2 heterobilayer bubble,significant oscillatory behavior of emission intensity is demonstrated due to constructive and destructive ***,oscillatory behaviors of peak position are also observed and come from a local heating effect induced by an excitation laser *** oscillatory mechanism of PL is further verified by changing the exterior pressure of bubbles placed in a home-made vacuum *** addition,redshifted in peak position and broadening in peak width are observed due to strain effect during decreasing the exterior pressure of bubbles.

关键词： bubble monolayer WS2 heterostructure In_(2)Se_(3)

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用于语义分割的自监督对比式表征学习

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西安电子科技大学学报 2024年第1期51卷 125-134页

作者：刘博翀蔡怀宇汪毅陈晓冬天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室天津300072

为了提升语义分割模型的精度,并减少逐像素标注大规模语义分割数据集的人力和时间成本,研究了自监督对比式表征学习的预训练方法,并结合语义分割任务的特点,设计了全局-局部交叉对比学习(GLCCL)方法。该方法将全局图像和局部分块后的一... 详细信息

为了提升语义分割模型的精度,并减少逐像素标注大规模语义分割数据集的人力和时间成本,研究了自监督对比式表征学习的预训练方法,并结合语义分割任务的特点,设计了全局-局部交叉对比学习(GLCCL)方法。该方法将全局图像和局部分块后的一系列图像块输入到网络中分别编码全局和局部视觉表征,并通过构建包含全局对比、局部对比和全局-局部交叉对比的损失函数来指导模型训练,使得模型能够同时学习全局和局部区域的视觉表征以及跨区域语义相关性。使用该方法预训练BiSeNet再迁移到语义分割任务时,对比现有的自监督对比式表征学习和有监督预训练方法分别具有0.24%和0.9%平均交并比(MIoU)的性能提升。实验结果表明,该方法能够采用无标注的数据训练语义分割模型而实现分割效果的提升,具有一定的实用价值。

关键词：语义分割自监督表征学习对比学习深度学习

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

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Journal of Materials Science & Technology 2021年第16期 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 TechnologyYanshan UniversityQinhuangdao 066004China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Low dimensional semiconductors can be used for various electronic and optoelectronic devices because of their unique structure and *** this work,one-dimensional Sb2 S3 nanowires(NWs)with high crystallinity were grown via chemical vapor deposition(CVD)technique on SiO2/Si *** Sb2 S3 NWs exhibited needle-like structures with inclined *** lengths of Sb2S3 nanowires changed from 7 to 13μ*** photodetection properties of Sb2 S3 nanowires were comprehensively and systematically *** Sb2S3 photodetectors show a broadband photoresponse ranging from ultraviolet(360 nm)to near-infrared(785 nm).An excellent specific detectivity of 2.1×10^(14)Jones,high external quantum efficiency of 1.5×10^(4)%,sensitivity of 2.2×10^(4)cm^(2)W^(-1)and short response time of less than 100 ms was achieved for the Sb2 S3 NW ***,the Sb2S3 NWs showed outstanding switch cycling stability that was beneficial to the practical *** high-quality Sb2S3 nanowires fabricated by CVD have great application potential in semiconductor and optoelectronic fields.

关键词： Sb2S3 nanowires Photodetector Chemical Vapor Deposition

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非线性Thau观测下的水下机器人定速推进故障识别

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现代电子技术 2024年第20期47卷 165-169页

作者：张博憧韩世迁王萍萍沈阳化工大学计算机科学与技术学院辽宁沈阳110142

水下机器人在水中运动时受水流、湍流和涡流等流体动力学的复杂影响,会对推进系统产生非线性影响,使得工作状态发生微小变化,难以准确估计其运行状态,增加了故障识别的难度。为此,提出一种非线性Thau观测下的水下机器人定速推进故障识... 详细信息

水下机器人在水中运动时受水流、湍流和涡流等流体动力学的复杂影响,会对推进系统产生非线性影响,使得工作状态发生微小变化,难以准确估计其运行状态,增加了故障识别的难度。为此,提出一种非线性Thau观测下的水下机器人定速推进故障识别方法。利用无损卡尔曼滤波估计水下机器人定速推进器的状态量;通过非线性Thau观测算法,结合状态量估计结果建立非线性Thau观测器,识别定速推进故障;通过模糊神经网络逼近非线性Thau观测器内的有界非线性不确定性扰动,提升故障识别精度。实验结果证明:该方法可有效估计水下机器人定速推进器的状态量,并逼近非线性Thau观测器的有界非线性不确定性扰动;而且可有效识别定速推进故障,故障识别精度较高。

关键词：非线性 Thau观测水下机器人定速推进故障识别无损卡尔曼滤波模糊神经网络

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