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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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Calcium carbonate promotes the formation and stability of soil macroaggregates in mining areas of China

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Journal of Integrative Agriculture 2024年第3期23卷 1034-1047页

作者： Junyu Xie jianyong Gao Hanbing Cao Jiahui Li xiang Wang Jie Zhang Huisheng Meng Jianping Hong Tingliang Li Minggang Xu College of Resources and Environment Shanxi Agricultural UniversityTaigu 030801China Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources Taiyuan 030031China College of Land Science and Technology China Agricultural UniversityBeijing 100193China

We studied changes in the concentrations of aggregate-cementing agents after different reclamation times and with different fertilization regimes,as well as the formation mechanism of aggregates in reclaimed soil,to provide a theoretical basis for rapid reclamation of soil fertility in the subsidence area of coal mines in Shanxi Province,*** this study,soil samples of 0–20 cm depth were collected from four fertilization treatments of a longterm experiment started in 2008:no fertilizer (CK),inorganic fertilizer (NPK),chicken manure compost (M),and50%inorganic fertilizer plus 50%chicken manure compost (MNPK).The concentrations of cementing agents and changes in soil aggregate size distribution and stability were *** results showed that the formation of>2 mm aggregates,the aggregate mean weight diameter (MWD),and the proportion of>0.25 mm water-stable aggregates (WR_(0.25)) increased significantly after 6 and 11 years of *** concentration of organic cementing agents tended to increase with reclamation time,whereas free iron oxide (Fed) and free aluminium oxide(Ald) concentrations initially increased but then *** general,the MNPK treatment signi?cantly increased the concentrations of organic cementing agents and CaCO_(3),and CaCO_(3) increased by 60.4%at 11 years after ***,CaCO_(3) had the greatest effect on the stability of aggregates,promoting the formation of>0.25 mm aggregates and accounting for 54.4%of the variance in the proportion and stability of the *** was concluded that long-term reclamation is bene?cial for improving soil *** MNPK treatment was the most effective measure for increasing maize grain yield and concentration of organic cementing agents and CaCO_(3).

关键词： reclamation time manure combined with inorganic fertilizer soil aggregate stability cementing agents CaCO_(3)

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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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Giant Valley Coherence at Room Temperature in 3R WS_(2) with Broken Inversion Symmetry

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Research 2019年第1期2019卷 466-473页

作者： Luojun Du Jian Tang Jing Liang Mengzhou Liao Zhiyan Jia Qinghua Zhang Yanchong Zhao Rong Yang Dongxia Shi Lin Gu jianyong xiang Kaihui Liu Zhipei Sun Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Electronics and Nanoengineering Aalto UniversityTietotie 3FI-02150Finland State Key Laboratory for Mesoscopic Physics Collaborative InnovationCenter of Quantum MatterSchool of PhysicsPeking UniversityBeijingChina State Key Laboratory for Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China School of Physical Sciences University of Chinese Academy of ScienceBeijing 100190China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China QTF Centre of Excellence Department of Applied PhysicsAalto UniversityFI-00076 AaltoFinland Songshan-Lake Materials Laboratory Dongguan523808 Guangdong ProvinceChina

Breaking the space-time symmetries in materials can markedly influence their electronic and optical *** 3R-stacked transition metal dichalcogenides,the explicitly broken inversion symmetry enables valley-contrasting Berry curvature and quantization of electronic angular momentum,providing an unprecedented platform for ***,we study the valley coherence of 3R WS_(2) large single-crystal with thicknesses ranging from monolayer to octalayer at room *** measurements demonstrate that both A and B excitons possess robust and thickness-independent valley *** valley coherence of direct A(B)excitons can reach 0.742(0.653)with excitation conditions on resonance with *** giant and thickness-independent valley coherence of large single-crystal 3R WS_(2) at room temperature would provide a firm foundation for quantum manipulation of the valley degree of freedom and practical application of valleytronics.

关键词： properties Inversion curvature

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