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High-sensitivity nanophotonic sensors with passive trapping of analyte molecules in hot spots

Light(Science & Applications) 2021年第1期10卷 60-70页

作者： Xianglong Miao Lingyue Yan Yun Wu Peter Q.Liu Department of electrical Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Department of Biomedical Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260

Nanophotonic resonators can confine light to deep-subwavelength volumes with highly enhanced near-field intensity and therefore are widely used for surface-enhanced infrared absorption spectroscopy in various molecular sensing *** enhanced signal is mainly contributed by molecules in photonic hot spots,which are regions of a nanophotonic structure with high-field ***,delivery of the majority of,if not all,analyte molecules to hot spots is crucial for fully utilizing the sensing capability of an optical ***,for most optical sensors,simple and straightforward methods of introducing an aqueous analyte to the device,such as applying droplets or spin-coating,cannot achieve targeted delivery of analyte molecules to hot ***,analyte molecules are usually distributed across the entire device surface,so the majority of the molecules do not experience enhanced field ***,we present a nanophotonic sensor design with passive molecule trapping *** an analyte solution droplet is introduced to the sensor surface and gradually evaporates,the device structure can effectively trap most precipitated analyte molecules in its hot spots,significantly enhancing the sensor spectral response and sensitivity ***,our sensors produce a reflection change of a few percentage points in response to trace amounts of the amino-acid proline or glucose precipitate with a picogram-level mass,which is significantly less than the mass of a molecular monolayer covering the same measurement *** demonstrated strategy for designing optical sensor structures may also be applied to sensing nano-particles such as exosomes,viruses,and quantum dots.

关键词： trapping passive spots

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Multiscale understanding of high-energy cathodes in solid-state batteries: from atomic scale to macroscopic scale

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Materials Futures 2022年第1期1卷 32-51页

作者： Shuo Sun Chen-Zi Zhao Hong Yuan Yang Lu Jiang-Kui Hu Jia-Qi Huang Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China Advanced research institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081People’s Republic of China State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084People’s Republic of China

In the crucial area of sustainable energy storage,solid-state batteries(SSBs)with nonflammable solid electrolytes stand out due to their potential benefits of enhanced safety,energy density,and cycle ***,the complexity within the composite cathode determines that fabricating an ideal electrode needs to link chemistry(atomic scale),materials(microscopic/mesoscopic scale),and electrode system(macroscopic scale).Therefore,understanding solid-state composite cathodes covering multiple scales is of vital importance for the development of practical *** this review,the challenges and basic knowledge of composite cathodes from the atomic scale to the macroscopic scale in SSBs are outlined with a special focus on the interfacial structure,charge transport,and mechanical *** on these dilemmas,emerging strategies to design a high-performance composite cathode and advanced characterization techniques are ***,future perspectives toward composite cathodes are discussed,aiming to facilitate the develop energy-dense SSBs.

关键词： high-energy cathode solid-state battery charge transport advanced characterization solid electrolyte

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Boosting pH-Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering

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Chinese Journal of Chemistry 2021年第2期39卷 288-294页

作者： Liling Liao Lun Yang Gang Zhao Haiqing Zhou Fengming Cai Yi Li Xiuzhang Wang Fang Yu Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangshaHunan410081 China institute for Advanced Materials Hubei Normal UniversityHuangshiHubei435002 China Nanotechnology&Application Center Ningbo Fengcheng Advanced Energy Materials Research InstituteNingboZhejiang315500 China

The design of high-efficiency non-noble and earth-abundant electrocatalysts for hydrogen evolution reaction(HER)is highly paramount for water splitting and renewable energy *** disulfide(MoS_(2))with abundant edge sites can be utilized as a promising alternative,but its catalytic activity is greatly related to the pH values,especially in an alkaline environment due to the extremely high energy barriers for water adsorption and dissociation *** we report an exceptionally efficient and stable electrocatalyst to improve the sluggish HER process of layered MoS_(2)particles in different pH electrolytes,especially in *** electrocatalyst is constructed by in situ growing selenium-doped MoS_(2)(Se-MoS_(2))nanoparticles on three-dimensional cobalt nickel diselenide(mCo_(0.2)Ni_(0.8)Se_(2))nanostructured *** to the large number of active edge sites of Se-MoS_(2)particles exposed at the surface,robust electrical conductivity and large surface area of mCo_(0.2)Ni_(0.8)Se_(2)support,and strong interfacial interactions between Se-MoS_(2)and mCo_(0.2)Ni_(0.8)Se_(2),this hybrid catalyst shows very outstanding catalytic HER properties featured by low overpotentials of 30 and 122 mV at 10 and 100 mA/cm^(2)with good operational stability in base,respectively,which outperforms most of inexpensive catalysts consisting of layered MoS_(2),transition metal selenides and sulfides,and it performs as well as noble Pt ***,this electrocatalyst is also very active in neutral and acidic electrolytes,requiring low overpotentials of 93 and 94 mV at 10 mA/cm^(2),respectively,demonstrating its superb pH universality as a HER electrocatalyst with excellent catalytic *** study provides a straightforward strategy to construct an efficient non-noble electrocatalyst for driving the HER kinetics in different electrolytes.

关键词： Hydrogen evolution reaction Molybdenum disulfide pH-universal Water splitting Heterogeneous catalysis

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Development and Validation of a Laboratory Aging Method for the Accelerated Simulation of Reclaimed Asphalt

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Journal of Wuhan University of Technology(Materials Science) 2010年第4期25卷 631-636页

作者： MOLLENHAUER K PIERARD N TUSAR M MOUILLET V GABET T Braunschweig Pavement Engineering Centre Belgium Road research Centre Slovenian National Building and Civil Engineering institute CETE Méditerranée Aix en Provence France Laboratoire de Ponts et Chaussées Nantes France

The paper presented first results elaborated during the European research Project Re-road which aims at the development of techniques for increasing the recycling rates of reclaimed asphalt. During service life surface asphalt courses are subjected to aging due to oxidation effects which causes the hardening of the binder and thereby a change in the chemical, physical and mechanical properties of the material. Surface courses often contain highly modified binders as well as special additives for improving the performance characteristics. As these layers inhibit the shortest service lives compared to other road construction layers every year high amounts of reclaimed surface asphalt are available for recycling. The question is raised how the reclaimed asphalt consisting of high quality and costly material components can be recycled for optimal added value. To analyze the asphalt mix service life performance and its recyclability during mix design a laboratory method was developed to simulate the real in-situ aging. First the effects of site aging on the binder and asphalt characteristics were presented. Three laboratory aging methods were discussed which aimed the accelerated aging which meets similar property changes as site aging. At last the effects of two different laboratory aging methods on the same SMA mixture were compared.

关键词： asphalt recycling laboratory aging site aging long-term aging validation tests chemical characteristics cracking resistance

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Air Stability of Solid‑State Sulfide Batteries and Electrolytes

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Electrochemical Energy Reviews 2022年第3期5卷 213-258页

作者： Pushun Lu Dengxu Wu Liquan Chen Hong Li Fan Wu Tianmu Lake institute of Advanced Energy Storage Technologies Liyang 213300JiangsuChina Yangtze River Delta Physics research Center Liyang 213300JiangsuChina Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Renewable EnergyBeijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Sulfides have been widely acknowledged as one of the most promising solid electrolytes(SEs)for all-solid-state batteries(ASSBs)due to their superior ionic conductivity and favourable mechanical ***,the extremely poor air stability of sulfide SEs leads to destroyed structure/performance and release of toxic H_(2)S gas,which greatly limits mass-production/practical application of sulfide SEs and *** review is designed to serve as an all-inclusive handbook for studying this critical ***,the research history and milestone breakthroughs of this field are reviewed,and this is followed by an in-depth elaboration of the theoretical paradigms that have been developed thus far,including the random network theory of glasses,hard and soft acids and bases(HSAB)theory,thermodynamic analysis and kinetics of interfacial ***,the characterization of air stability is reviewed from the perspectives of H2S generation,morphology evolution,mass change,component/structure variations and electrochemical ***,effective strategies for improving the air stabilities of sulfide SEs are highlighted,including H_(2)S absorbents,elemental substitution,design of new materials,surface engineering and sulfide-polymer composite ***,future research directions are proposed for benign development of air stability for sulfide SEs and ASSBs.

关键词： Sulfide solid electrolytes Air stability Superionic conductors All-solid-state batteries

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design of artificial biomimetic channels with Na^(+)permeation rate and selectivity potentially outperforming the natural sodium channel

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Nano research 2024年第9期17卷 8638-8646页

作者： Zhi Zhu Yan Zhao Chao Chang Shaojian Yan Tingyu Sun Shiyu Gu Yangmei Li Dengsong Zhang Chunlei Wang Xiao Cheng Zeng School of Optical-electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China School of Physics Peking UniversityBeijing 100871China International Joint Laboratory of Catalytic Chemistry College of SciencesShanghai UniversityShanghai 200444China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Artificial ion channels that enable high-efficiency ion transport have important implications in nanofluidics and biomedical applications such as drug ***,we show a simulation-based chemical design of a biomimetic sodium channel that possesses permeation rate and selectivity potentially higher than those of the state-of-the-art natural vertebrate voltage-gated sodium ***,our theoretical findings have undergone empirical testing,aligning well with the Arrhenius law as derived from a diverse range of experimental *** high-efficiency ion transport is achieved by anchoring the carboxylate functional groups within the channel filter.A key chemical guiding principle underlying the ion channel design is that the free-energy barrier for the Na^(+)passage across the channel should be comparable to typical thermal energy at room *** the implementation of the chemical design,we found that the relatively low free-energy barrier can be attributed to the compensation effect of the carboxylate groups to the partially lost oxygen shell of the ion within the ion channel,as well as to the consonant vibration of the ions inside and outside the *** mechanistic understanding brings new insight,at the molecular level,into the high-efficiency ion transport across the designed membrane *** proof of principle achieved from the simulations will stimulate future experimental confirmation and potential applications of the high-performance artificial channels in nanofluidics and in bioinspired iontronics.

关键词： sodium channels anchoring carboxylate functional groups molecular dynamics simulations low free-energy barrier for ion passage thermal kinetic energy

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Helium-ion-beam nanofabrication: extreme processes and applications

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International Journal of Extreme Manufacturing 2021年第1期3卷 1-23页

作者： Shixuan He Rong Tian Wei Wu Wen-Di Li Deqiang Wang Chongqing Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714People’s Republic of China College of Physics Sichuan UniversityChengduSichuan 610065People’s Republic of China Department of electrical Engineering University of Southern CaliforniaLos AngelesCA 90089United States of America Department of mechanical Engineering The University of Hong KongPokfulamHong KongPeople’s Republic of China

Helium ion beam(HIB)technology plays an important role in the extreme fields of *** paper reviews the latest developments in HIB technology as well as its extreme processing capabilities and widespread applications in ***-based nanofabrication includes direct-write milling,ion beam-induced deposition,and direct-write lithography without resist *** nanoscale applications have also been evaluated in the areas of integrated circuits,materials sciences,nano-optics,and biological *** review covers four thematic applications of HIB:(1)helium ion microscopy imaging for biological samples and semiconductors;(2)HIB milling and swelling for 2D/3D nanopore fabrication;(3)HIB-induced deposition for nanopillars,nanowires,and 3D nanostructures;(4)additional HIB direct writing for resist,graphene,and plasmonic *** paper concludes with a summary of potential future applications and areas of improvement for HIB extreme nanofabrication technology.

关键词： helium ion beam extreme nanofabrication direct writing nanostructures

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Triboelectrification induced UV emission from plasmon discharge

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Nano research 2015年第1期8卷 219-226页

作者： Chang Bao Han Chi Zhang Jingjing Tian Xiaohui Li Limin Zhang Zhou Li Zhong Lin Wang Beijing institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China 'School of Material Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

UV is a high-energy electromagnetic radiation that has been widely used in industrial production and the scientific research domain. In this work, a deep UV light emission was obtained using triboelectrification induced plasma discharge without any extra power supply. By a mechanical friction between polymer and quartz glass, the triboelectric charges cause a changing electric field, which may bring plasma discharge of low pressure gas （Ar-Hg） and give out 253.7 nm irradiation. The UV light caused by continuous friction can excite a trichromatic phosphor and afford a bright white light emission. A UV sterilization experiment shows that -98% of Escherichia coil can be killed in 30 min by UV irradiation, which reveals that a self-powered sterilization apparatus with good sterilization effect was fabricated. This work provides a novel design to fabricate a self- powered UV light emitting device using low-frequency mechanical friction and realizes the coupling of triboelectrificafion and plasma luminescence, which may further expand the application of UV light in special circumstances.

关键词： triboelectrification light emitting plasma discharge UV light sterilization

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ChemFET gas nanosensor arrays with alignment windows for assembly of single nanowires

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Nano research 2023年第7期16卷 10234-10244页

作者： Ondřej Chmela Imrich Gablech Jakub Sadílek Jan Brodský Stella Vallejos Central European institute of Technology Brno University of TechnologyPurkyňova 12361200 BrnoCzech Republic Faculty of electrical Engineering and Communication Brno University of TechnologyDepartment of MicroelectronicsTechnická3058/1061200 BrnoCzech Republic Instituto de Microelectrónica de Barcelona(IMB-CNM CSIC)Campus UABCarrer dels Til·lersCerdanyola del Vallès08193 BarcelonaSpain

This work focuses on the fabrication and characterization of Chemical Field-Effect Transistor(ChemFET)gas nanosensor arrays based on single nanowire(SNW).The fabrication processes include micro and nanofabrication techniques enabled by a combination of ultraviolet(UV)and e-beam lithography to build the ChemFET *** show the integration and connection of SNWs across the multiple pairs of nanoelectrodes in the ChemFET by dielectrophoresis process(DEP)thanks to the incorporation of alignment windows(200-300 nm)adapted to the diameter of the *** of the SNW ChemFET array's output and transfer characteristics prove the influence of gate bias on the drain current *** upon hydrogen(H_(2))and nitrogen dioxide(NO_(2))as analyte models of reducing and oxidizing gases show the ChemFET sensing ***,results demonstrate better response characteristics to H_(2)when the ChemFET operates in the subthreshold *** design concepts and methods proposed for fabricating the SNW-based ChemFET arrays are versatile,reproducible,and most likely adaptable to other systems where SNW arrays are required.

关键词： Chemical Field-Effect Transistor(ChemFET)nanosensors nanowires nanoelectrodes gas sensors

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Exploring the interconnectivity of biomimetic hierarchical porous Mg scaffolds for bone tissue engineering:Effects of pore size distribution on mechanical properties,degradation behavior and cell migration ability

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Journal of Magnesium and Alloys 2021年第6期9卷 1954-1966页

作者： Gaozhi Jia Hua Huang Jialin Niu Chenxin Chen Jian Weng Fei Yu Deli Wang Bin Kang Tianbing Wang Guangyin Yuan Hui Zeng Department of Bone&Joint Surgery Peking University Shenzhen HospitalShenzhen Peking University-The Hong Kong University of Science and Technology Medical CenterShenzhen 518036China National Engineering research Center of Light Alloy Net Forming&State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials Beijing Aircraft Technology Research Institute of COMACBeijing 102211China National&Local Joint Engineering research Center of Orthopaedic Biomaterials Peking University Shenzhen HospitalShenzhen 518036China Department of Orthopaedics Peking University People's HospitalBeijing 100044China

Interconnectivity is the key characteristic of bone tissue engineering scaffold modulating cell migration,blood vessels invasion and transport of nutrient and ***,efforts and understanding of the interconnectivity of porous Mg is limited due to the diverse architectures of pore struts and pore size distribution of Mg scaffold *** this work,biomimetic hierarchical porous Mg scaffolds with tailored interconnectivity as well as pore size distribution were prepared by template replication of infiltration *** scaffold with better interconnectivity showed lower mechanical *** interconnected pores would enhance the interconnectivity of the whole scaffold and reduce the change of ion concentration,pH value and osmolality of the degradation microenvironment due to the lower specific surface ***,the degradation rates of five tested Mg scaffolds were no different because of the same geometry of strut *** cell culture and evaluation of cell density at both sides of four typical Mg scaffolds indicated that cell migration through hierarchical porous Mg scaffolds could be enhanced by not only bigger interconnected pore size but also larger main pore *** summary,design of interconnectivity in terms of pore size distribution could regulate mechanical strength,microenvironment in cell culture condition and cell migration potential,and beyond that it shows great potential for personalized therapy which could facilitate the regeneration process.

关键词： Bone tissue engineering Porous Mg scaffold Interconnectivity Pore size distribution Cell migration

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