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Polymerization-Induced Aggregation Approach toward Uniform Pd Nanoparticle-Decorated Mesoporous SiO2/WO3 Microspheres for Hydrogen Sensing

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ACS Applied Materials and Interfaces 2023年第12期15卷 15721-15731页

作者： Zhang, Ziling Ma, Junhao Deng, Yu Ren, Yuan Xie, Wenhe Deng, Yonghui Zou, Yidong Luo, Wei State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China Fudan University Shanghai200433 China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China

Hydrogen as an important clean energy source with a high energy density has attracted extensive attention in fuel cell vehicles and industrial production. However, considering its flammable and explosive property, gas sensors are desperately desired to efficiently monitor H2 concentration in practical applications. Herein, a facile polymerization-induced aggregation strategy was proposed to synthesize uniform Si-doped mesoporous WO3 (Si-mWO3) microspheres with tunable sizes. The polymerization of the melamine-formaldehyde resin prepolymer (MF prepolymer) in the presence of silicotungstic acid hydrate (abbreviated as H4SiW) leads to uniform MF/H4SiW hybrid microspheres, which can be converted into Si-mWO3 microspheres through a simple thermal decomposition treatment process. In addition, benefiting from the pore confinement effect, monodispersed Pd-decorated Si-mWO3 microspheres (Pd/Si-mWO3) were subsequently synthesized and applied as sensitive materials for the sensing and detection of hydrogen. Owing to the oxygen spillover effect of Pd nanoparticles, Pd/Si-mWO3 enables adsorption of more oxygen anions than pure mWO3. These Pd nanoparticles dispersed on the surface of Si-mWO3 accelerated the dissociation of hydrogen and promoted charge transfer between Pd nanoparticles and WO3 crystal particles, which enhanced the sensing sensitivity toward H2. As a result, the gas sensor based on Pd/Si-mWO3 microspheres exhibited excellent selectivity and sensitivity (Rair/Rgas = 33.5) to 50 ppm H2 at a relatively low operating temperature (210 °C), which was 30 times higher than that of the pure Si-mWO3 sensor. To develop intelligent sensors, a portable sensor module based on Pd/Si-mWO3 in combination with wireless Bluetooth connection was designed, which achieved real-time monitoring of H2 concentration, opening up the possibility for use as intelligent H2 sensors. © 2023 American Chemical Society.

关键词： Microspheres

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Analysis of fill factor and diffraction influence on micro-lens array imaging system 2

Analysis of fill factor and diffraction influence on micro-l...

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Advanced Optical Manufacturing Technologies and Applications 2022, AOMTA 2022 and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2022

作者： Lv, Zhiyang Huang, Yunhan Liu, Zhiying School of Opto-Electronic Engineering Key Laboratory of Optoelectric Measurement and Optical Information Transmission Technology of Ministry of Education Changchun University of Science and Technology Changchun130022 China

ISBN: (纸本)9781510661264

Aiming at the problem of obvious diffraction when light encounters small-diameter components during transmission, we analyze the diffraction effect of micro-lens arrays in this paper. Since the fill factor of the micro-lens array determines the amount of light entering the system, which affects the diffraction effect, and ultimately affects the imaging quality together with the diffraction of the small components, we first use the scalar diffraction theory to analyze and establish the mathematical model of the fill factor of the aperture array and propose a theoretical calculation method. According to this method, different forms of aperture arrays with the same fill factor can be given through geometric relations and system parameters, and then we use an optical analysis software VirtualLab to simulate the diffraction effect. By comparing the light intensity distribution forms and exploring the diffraction effect of the aperture array form on the imaging quality, corresponding conclusions are drawn and a more advantageous structural form is selected. © 2023 SPIE. All rights reserved.

关键词： Diffraction

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Cross-border Data Security Risk Analysis and Development Suggestions of the Protection Technologies for Intelligent Connected Vehicles 5

Cross-border Data Security Risk Analysis and Development Sug...

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5th International Conference on information science, Parallel and Distributed systems, ISPDS 2024

作者： Huang, Xiaolong Xin, Chongshi Ji, Haojie Lu, Wangdong He, Peng Chen, Yupeng State Key Laboratory of Intelligent Vehicle Safety Technology Chongqing China Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science & Technology University Beijing China China Automotive Engineering Research Institute Co. Ltd Chongqing China

ISBN: (纸本)9798350352719

In recent years, intelligent connected vehicles (ICVs) have developed quickly and have been progressively introduced into the international market. Nevertheless, the operation of ICVs produces a large amount of important data coming from driving vehicle and necessitating cross-border transit. As the imperfections of the regulatory framework and the infancy of protective solutions for the ICV data, these data are vulnerable to the threats like eavesdropping and tampering during cross-border transmission. The private information, especially the data barred from leaving the country, will be probably leaked to other nations, endangering individual privacy and national security. Thus, the purpose of this manuscript is to analyze the security risks of cross-border data in ICVs and provide risk mitigation strategies. The legal requirements and pertinent cross-border materials need to be sorted out firstly to establish a thorough technical process for cross-border compliance of ICV data. Additionally, the ICV data risk analyses will be performed at every stage of the cross-border process. Furthermore, some efficient risk mitigation methods need to be offered to improve the security and dependability of the across-border data of ICVs. To address the problems associated with cross-border data pertaining to ICVs, a classification method for the cross-border data of ICVs will be presented according to current rules and data categorization schemes. Finally, this manuscript provides theoretical underpinnings and useful references for building a cross-border data security protection system, as well as a thorough analysis of the development patterns of cutting-edge technologies for cross-border data. © 2024 IEEE.

关键词： cross-border data data security protection technology risk analysis

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Laser oscillation welding process control of LZ91 magnesium-lithium alloy/TC4 titanium alloys 3

Laser oscillation welding process control of LZ91 magnesium-...

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3rd International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2023

作者： Wang, Libo Zhu, Zhengwu Liu, Qing Li, Meng The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China Optics Valley Laboratory Hubei430074 China

ISBN: (纸本)9781510667624

In this experiment, the LZ91 Mg-Li alloy and TC4 titanium alloy were joined with a thickness of 2 mm by using a fiber laser, which investigated the effect of beam stirring frequency on the microstructure and mechanical properties of welded joints. The results showed that the oscillation of the beam would improve the molten pool stirring driving force and helped the Al element in the base material of TC4 titanium alloy flow to the molten pool, which caused the Mg-Al reinforced phase precipitated at the intersection of LZ91 and TC4 to significantly improve the bond strength of the weld, with the maximum microhardness reached 71.32 HV and the maximum tensile strength reached 153 MPa. © 2023 SPIE.

关键词： Microstructure

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Boosting the photo-induced charge transfer in melon by lengthening the melon chains through a facile regrowth approach

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Nano Research 2023年第2期16卷 2076-2084页

作者： Tongtong Li Shulan Wang Li Li Xiaohua Yu Huaze Zhu Ningdong Feng Ju Rong Yongqiang Yang Gang Liu Department of Chemistry College of ScienceNortheastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110819China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics Wuhan Center for Magnetic Resonance Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China

Melon-derived carbon nitride photocatalysts are a kind of star layered materials applied in solar energy *** in-planeπorbitals of the heptazine subunits and their overlap along the melon chains being the most distinctive feature,the condition of melon chains is of great importance for the atomic and energy band structures of carbon nitride photocatalysts as well as their *** principle,fragmentized melon chains in practical carbon nitride would lead to unfavorable structure disorder both in longitudinal and vertical directions,thus inhibiting the efficient transfer for photo-induced electrons and holes,***,with a facile regrowth approach,that is to treat carbon nitride under the atmosphere containing C/N species,the melon chains in carbon nitride were experimentally lengthened,which was reflected by the regularly fraction variation of different nitrogen species derived from X-ray photoelectron spectroscopy(XPS)*** prolonged melon chains led to dramatically improved in-plane structure order and boosted transfer of photo-induced electrons and holes,which were confirmed by the spontaneous photo-deposition of oxidants and *** combination of this regrowth approach with homogenously distributed nitrogen vacancies resulted in much enhanced visible-light-responsive ***,control experiments using nitrogen-vacancy-free carbon nitride and different C/N-contained precursors showed the compatibility as well as the critical factors for the lengthening effects of the regrowth *** hope that the facile but efficient regrowth approach could be widely adopted in melon-derived carbon nitride photocatalysts used for various applications.

关键词： carbon nitride melon chains structure order photocatalytic hydrogen evolution charge transfer charge separation

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A Real-time Demonstration of Bidirectional Multiformat/Rate-adjustable Integrated Laser Communication/Ranging for Satellite Communication

A Real-time Demonstration of Bidirectional Multiformat/Rate-...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Wang, Yizhou Wang, Yuanxiang Luo, Zhen Zhong, Linsheng Zou, Yang Ao, Xueyuan Liu, Jiale Fan, Feng Li, Xiaoliang Dai, Xiaoxiao Yang, Qi Liu, Deming National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security School of Cyber Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Beijing Research Institute of Telemetry Beijing100094 China Jinyinhu Laboratory Wuhan430040 China

A multi-format/rate-adjustable integrated laser communication/ranging system is proposed, achieving adjustable rates between 0.625-10Gbit/s. Real-time experiment shows that at 1e-4 BER the ranging error is only 0.29% ... 详细信息

ISBN: (纸本)9781957171395

关键词： Laser theory

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A novel low-profile wideband dual-polarized metasurface antenna with high isolation 16

A novel low-profile wideband dual-polarized metasurface ante...

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16th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2023

作者： Liu, Haotian Chen, Dongxu Yang, Wanchen Chen, Jiaqi Cao, Ning Che, Wenquan Xue, Quan Hohai University College of Information Science and Engineering Nanjing210098 China South China University of Technology Guangdong Key Laboratory of Millimeter-Waves and Terahertz School of Electronic and Information Engineering Guangzhou510641 China

ISBN: (纸本)9798350339406

In this work, a novel low-profile wideband dualpolarized metasurface (MS) antenna with high isolation is proposed for C-band applications. To achieve dual polarizations, the MS is not only used as a radiator but also as a ground plane. In detail, for vertical polarization (VP), the MS is a radiator fed by a slot-coupled microstrip line, and for horizontal polarization (HP), the MS is a ground plane of a differential-coaxial patch radiator. The overall size of the proposed antenna is 1.1λ0×1.1λ0×0.079λ0 (λ0 is the free-space wavelength at 5.5 GHz). The simulated results show that the -10dB impedance bandwidths of the HP and VP are 28.4% (4.84~6.44GHz) and 38.7% (4.83~7.15GHz), respectively. Besides, the isolation between the two ports is higher than 51dB, and the maximum realized gain is 9.6dBi and 9.1dBi. © 2023 IEEE.

关键词： Radiators

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Isovalent co-alloying contributes to considerable improvement in thermoelectric performance of BiSe bulks with weak anisotropy

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Journal of Materiomics 2024年第5期10卷 965-974页

作者： Fu Li Chen Liu Mohammad Nisar Jian Zhao Chongbin Liang Junze Zhang Ziyuan Wang Zhuanghao Zheng Ping Fan Xilin Wang Zhen-Hua Ge Yue-Xing Chen Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060GuangdongChina Kunming University of Science and Technology Kunming650093China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen518060GuangdongChina

BiSe with intrinsic low thermal conductivity has considered as a promising thermoelectric(TE)material at nearly room *** improve its low thermoelectric figure of merit(zT),in this work,Sb and Te isovalent co-alloying was performed and significantly optimized its TE property with weakly anisotropic *** substituting Sb on Bi sites,the carrier concentration is suppressed by introduction of Sbsingle bond Se site defects,which contributes to the increased absolute value of Seebeck coefficient(|S|).Further co-alloying Te on Se of the optimized composition Bi_(0.7)Sb_(0.3)Se,the carrier concentration increased without affecting the|S|due to the enhanced effective mass,which leads to a highest power factor of 12.8μW/(cm·K^(2))at 423 *** a result,a maximum zT of∼0.54 is achieved for Bi_(0.7)Sb_(0.3)Se_(0.7)Te_(0.3) along the pressing direction and the average zT(zTave)(from 300 K to 623 K)are drastically improved from 0.24 for pristine BiSe sample to ***,an energy conversion efficiency∼4.0%is achieved for a single leg TE device of Bi_(0.7)Sb_(0.3)Se_(0.7)Te_(0.3)when applied the temperature difference of 339 K,indicating the potential TE application.

关键词： BiSe Isovalent alloying zT Carrier modulation

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Detection of a temporal salient object benefits from visual stimulus-specific adaptation in avian midbrain inhibitory nucleus

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Integrative Zoology 2024年第2期19卷 288-306页

作者： Jiangtao WANG Xiaoping RAO Shuman HUANG Zhizhong WANG Xiaoke NIU Minjie ZHU Songwei WANG Li SHI Department of Automation Zhengzhou University School of Electrical EngineeringZhengzhouChina State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanKey Laboratory of Magnetic Resonance in Biological SystemsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhanChina Department of Automation Tsinghua UniversityBeijingChina

Food and predators are the most noteworthy objects for the basic survival of wild animals,and both are often deviant in both spatial and temporal domains and quickly attract an animal’s *** stimulus-specific adaptation(SSA)is considered a potential neural basis of salient sound detection in the temporal domain,related research on visual SSA is limited and its relationship with temporal saliency is *** avian nucleus isthmi pars magnocellularis(Imc),which is central to midbrain selective attention network,is an ideal site to investigate the neural correlate of visual SSA and detection of a salient object in the time ***,the constant order paradigm was applied to explore the visual SSA in the Imc of *** results showed that the firing rates of Imc neurons gradually decrease with repetitions of motion in the same direction,but recover when a motion in a deviant direction is presented,implying visual SSA to the direction of a moving ***,enhanced response for an object moving in other directions that were not presented ever in the paradigm is also *** verify the neural mechanism underlying these phenomena,we introduced a neural computation model involving a recoverable synaptic change with a“center-surround”pattern to reproduce the visual SSA and temporal saliency for the moving *** results suggest that the Imc produces visual SSA to motion direction,allowing temporal salient object detection,which may facilitate the detection of the sudden appearance of a predator.

关键词： adaptation attention model pigeon saliency

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High-performance multifunctional(Hf^(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))C high-entropy ceramic reinforced with low-loading 3D hybrid graphene–carbon nanotube

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Journal of Advanced Ceramics 2023年第2期12卷 341-356页

作者： Jialin SUN Jun ZHAO Yonghui ZHOU Peng ZHAI Xialun YUN Zhifu HUANG Hui ZHANG Guohua ZHANG School of Mechanical Electrical&Information EngineeringShandong University(Weihai)Weihai 264209China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education School of Mechanical EngineeringShandong UniversityJinan 250061China State Key Laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

There has been growing interest in the high-entropy ceramic(HEC)recently owing to its tailorable compositions and microstructures,versatile properties,together with promising structural and functional ***,inferior fracture toughness(KIC)and damage tolerance restricted many practical applications of the ***,we addressed this challenge by incorporating a threedimensional graphene–carbon nanotube(3D G–CNT)as toughening agent in(Hf_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))*** resulting enhanced 3D G–CNT/(Hf_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))C featured an outstanding toughness of 8.23 MPa·m^(1/2),while remaining superior strength(763 MPa)and hardness(24.7 GPa).An ultralow friction coefficient(0.15)coupled with an ultralow wear rate(w,2.6×10^(−7) mm^(3)/(N·m))in the 3D G–CNT/(Hf_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))C was obtained primarily as a function of lubricating scrolls,in which two-dimensional(2D)graphene acted as a tribolayer,and one-dimensional(1D)carbon nanotubes acted as nano ball bearings embedded ***,the 3D G–CNT/(Hf_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))C exhibited rather low thermal conductivity(κ)yet excellent electrical conductivity(σ,1.3×10^(6) S/m)in comparison with the pure(Hf_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)Zr_(0.2))*** study provided great potential for maximizing the physical and functional properties of the HEC for various applications.

关键词： high-entropy ceramic(HEC) three-dimensional graphene-carbon nanotube(3D G-CNT) toughening lubricating thermal conductivity(κ)/electrical conductivity(σ)

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