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Nano Research 2024年第7期17卷 6534-6543页

作者： Ya-Chuan Liang Qing Cao Yuan Deng Yong Wang Kai-Kai Liu Chong-Xin Shan School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002China henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China

Easy non-radiative decay property of long-lived triplet excitons in aqueous solution obstructs their applications in aquatic *** reported phosphorescence phenomena in aqueous solution have excited researchers enormously but achieving full-color water-soluble phosphorescent carbon nanodots(CNDs)is still a challenging ***,full-color phosphorescence of water-soluble CNDs has been demonstrated by triggering their triplet excitons through nanospace domain confinement,and Förster energy resonance transfer is used for further tuning phosphorescence *** phosphorescence spans across most of the visible spectrum,ranging from 400 to 700 *** an aqueous solution,the CNDs exhibits blue,green,and red phosphorescence,lasting for approximately 6,10,and 7 s,***,the phosphorescence quantum yields are 11.85%,8.6%and 3.56%,making them readily discernible to the naked eyes and laying a solid foundation for practical ***,phosphorescence flexible optical display and bioimaging have been demonstrated by using the multicolor CNDs-based nanomaterials,showing distinct superiority for accuracy and complete display and imaging in complex emission background.

关键词： carbon nanodots triplet excitons multicolor aqueous solution

Theoretical study of superradiant masing with solid-state spins at room temperature

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 38-47页

作者： Qilong Wu Yuan Zhang Hao Wu Shi-Lei Su Kai-Kai Liu Mark Oxborrow Chong-Xin Shan Klaus Mølmer henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academy of Quantum Information Sciences Beijing 100193China Department of Materials Imperial College LondonLondon SW72AZUK Niels Bohr Institute University of CopenhagenCopenhagen 2100Denmark

Steady-state superradiance and superradiant lasing attract significant attentions in the field of optical lattice clocks,but have not been achieved yet due to the technical challenges and atom loss *** this article,we propose that their counter-part may be observed in the microwave domain with solid-state spins,i.e.,nitrogen-vacancy center spins and pentacene molecular spins,coupled to microwave resonator at room temperature with realistic technical *** validate our proposal,we investigate systematically the system dynamics and steady-state by solving quantum master equations for the multi-level and multi-process dynamics of trillions of *** calculations show that the superradiant Rabi oscillations occur firstly due to transitions among different Dicke states,and the subsequent continuous-wave superradiant masing can achieve a linewidth well below *** work may guide further exploration of transient and steady-state superradiant masing with the mentioned and other solid-state spins *** ultra-narrow linewidth may find applications in deep-space communications,radio astronomy and high-precision metrology.

关键词： solid-state spins superradiance maser

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Visible-light-promoted tandem decarboxylation coupling/cyclization of N-aryl glycines with quinoxalinones: Easy access to tetrahydroimidazo [1,5-a]quinoxalin-4(5H)-ones

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Green Synthesis and Catalysis 2024年第1期5卷 31-34页

作者： Zhen Tang Chao Pi Yangjie Wu Xiuling Cui henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan UniversitiesGreen Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou450052China

A visible-light-promoted formal[2+2+1]cyclization of N-aryl glycines with quinoxalin-2(1H)-ones to synthesize tetrahydroimidazo[1,5-a]quinoxalin-4(5H)-ones have been *** protocol features operational simplicity,mild reaction conditions with blue LED light employing Ru(bpy)3Cl2.6H2O as a photoredox catalyst,a combination of O2 from air and Cu(OAc)2 as the oxidant and broad substrate applicability.

关键词： Cyclization Decarboxylation Visible-light-promoted Quinoxalin-2(1H)-ones Mild conditions

Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction

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Carbon Energy 2024年第1期6卷 236-244页

作者： Zhichao Jia Yang Yuan Yanxing Zhang Xiang Lyu Chenhong Liu Xiaoli Yang Zhengyu Bai Haijiang Wang Lin Yang Key Laboratory of Green Chemical Media and Reactions School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsMinistry of EducationHenan Normal UniversityXinxiangHenanChina School of Physics Henan Normal UniversityXinxiangHenanChina Oak Ridge National Laboratory Electrification and Energy Infrastructures DivisionOak RidgeTennesseeUSA Department of Mechanical and Energy Engineering Key Laboratory of Energy Conversion and Storage TechnologiesSouthern University of Science and TechnologyShenzhenGuangdongChina

Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions(OERs).Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next ***,Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mAcm−***,it had an overpotential of 260 mV(glassy carbon)or 215 mV(nickel foam),which was 78 mV lower than that of IrO_(2)(338 mV).In situ,Raman spectroscopy revealed the transformation process of *** using the density functional theory showed that during OER,doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process,which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER *** research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.

关键词： electrocatalyst in situ Raman Mo-doped CoOOH oxygen evolution reaction

Ultraviolet phosphorescent carbon nanodots

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Light(Science & Applications) 2022年第6期11卷 1274-1284页

作者： Shi-Yu Song Kai-Kai Liu Qing Cao Xin Mao Wen-Bo Zhao Yong Wang Ya-Chuan Liang Jin-Hao Zang Qing Lou Lin Dong Chong-Xin Shan henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

Phosphorescent carbon nanodots(CNDs)have generated enormous interest recently,and the CND phosphorescence is usually located in the visible region,while ultraviolet(UV)phosphorescent CNDs have not been reported thus ***,the UV phosphorescence of CNDs was achieved by decreasing conjugation size and in-situ spatial confinement in a NaCNO *** electron transition from the P_(x) to the sp^(2) orbit of the N atoms within the CNDs can generate one-unit orbital angular momentum,providing a driving force for the triplet excitons population of the *** confinement caused by the NaCNO crystal reduces the energy dissipation paths of the generated triplet *** further tailoring the size of the CNDs,the phosphorescence wavelength can be tuned to 348 nm,and the room temperature lifetime of the CNDs can reach 15.8 *** a demonstration,the UV phosphorescent CNDs were used for inactivating gram-negative and gram-positive bacteria through the emission of their high-energy photons over a long duration,and the resulting antibacterial efficiency reached over 99.9%.This work provides a rational design strategy for UV phosphorescent CNDs and demonstrates their novel antibacterial applications.

关键词： rational ultraviolet lifetime

Ultrasensitive broadband position-sensitive detector based on graphitic carbon nitride

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Nano Research 2023年第1期16卷 1277-1285页

作者： Xuexia Chen Xun Yang Qing Lou Yongzhi Tian Zhiyu Liu Chaofan Lv Yancheng Chen Lin Dong Chong-Xin Shan henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

As a typical two-dimensional material,graphitic carbon nitride(g-CN)has attracted great interest because of its distinctive electronic,optical,and catalytic ***,the absence of a feasible route toward large-area and high-quality films hinders its development in ***,high-quality g-CN films have been grown on Si substrate via a vapor-phase transport-assisted condensation *** g-CN/Si heterojunction shows an obvious response to ultraviolet–visible-near infrared photons with a responsivity of 133 A·W−1,which is two orders of magnitude higher than the best value ever reported for g-CN photodetectors.A position-sensitive detector(PSD)has been developed using the lateral photovoltaic effect of the g-CN/Si *** PSD shows a wide response spectrum ranging from 300 to 1,100 nm,and a position sensitivity and rise/decay time of 395 mV·mm−1 and 3.1/50μs,***,the application of the g-CN/Si heterojunction photodetector in trajectory tracking and acoustic detection has been realized for the first *** work unveils the potential of g-CN for large-area photodetectors,and prospects for their applications in trajectory tracking and acoustic detection.

关键词： graphitic carbon nitride(g-CN) position-sensitive detector(PSD) lateral photovoltaic effect(LPE) heterojunction trajectory tracking acoustic detection

Dual-ionic imidazolium salts to promote synthesis of cyclic carbonates at atmospheric pressure

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Green Energy & Environment 2022年第6期7卷 1327-1339页

作者： Tengfei Wang Danning Zheng Beibei An Yi Liu Tiegang Ren HansÅgren Li Wang Jinglai Zhang Mårten S.G.Ahlquist henan Engineering Research center of Green Anticorrosion Technology for Magnesium Alloys Henan UniversityKaifengHenan475004China henan Engineering Research center of Corrosion and Protection for Magnesium Alloys Henan UniversityKaifengHenan475004China College of Chemistry and Chemical Engineering Henan UniversityKaifengHenan475004China Department of Theoretical Chemistry&Biology School of BiotechnologyKTH Royal Institute of Technology10691 StockholmSweden

Novel dual-ionic imidazolium salts are shown to display excellent catalytic activity for cycloaddition of carbon dioxide and epoxides under room temperature and atmospheric pressure(0.1 MPa)without any solvent and co-catalyst leading to 96.1%product *** can be reused five times to keep the product yield over 90%.These intriguing results are attributed to a new reaction mechanism,which is supported by theoretical calculations along with the measurements of ^(13)C NMR spectrum and Fourier transform infrared spectroscopy(FT-IR).The excellent catalytic activity can be traced to a CO_(2)-philic group along with an electrophilic hydrogen *** work shows that incorporation of CO_(2)-philic group is an feasible pathway to develop the new efficient ionic liquids.

关键词： Dual-ionic imidazolium salts CO_(2)-Philic group New mechanism Room temperature Atmospheric pressure

Ru(Ⅲ)-catalyzed construction of variously substituted quinolines from 2-aminoaromatic aldehydes(ketones)and isoxazoles:Isoxazoles as cyclization reagent and cyano sources

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Chinese Chemical Letters 2022年第8期33卷 4064-4068页

作者： Di Hu Chao Pi Wei Hu Xiliang Han Yangjie Wu Xiuling Cui henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan UniversitiesGreen Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450052China

A Ru(Ⅲ)-catalyzed annulation reaction of 2-aminoaromatic aldehydes(ketones)and isoxazoles to afford diverse 3-cyanoquinolines has been ***,isoxazole acted as a cyclization reagent and nontoxic cyano source via N-O bond cleavage and *** substituted(especially 6-or 7-substituted)quinolines could be easily *** procedure features wide functional group compatibility,efficiency and avoiding toxic cyano ***,this protocol could be successfully applied to scale-up *** chemical transformations of 3-cyanoquinoline could give some valuable skeletons,demonstrating its potential in synthetic application.

关键词： Isoxazoles Cyclization reagent Cyano sources Variously substituted 3-cyanoquinolines

Experimental and numerical investigation of mechanical behavior of plain woven CFRP composites subjected to three-point bending

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Chinese Journal of Aeronautics 2023年第7期36卷 505-517页

作者： Qiaoli ZHAO Yuliang HOU Weihan WANG Yutong LIU Cheng LI School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

The mechanical behavior of plain woven Carbon Fiber-Reinforced Polymer(CFRP)composites under Three-Point Bending(TPB)is investigated via experimental and numerical *** models,including microscale,mesoscale and macroscale models,have been developed to characterize the TPB strength and ***,Representative Volume Elements(RVEs)of the microscale and mesoscale structures are established to determine the effective properties of carbon-fiber yarn and CFRP composites,*** at accurately and efficiently predicting the TPB behavior,an Equivalent Cross-Ply Laminate(ECPL)cell is proposed to simplify the inherent woven architecture,and the effective properties of the subcell are computed using a local homogenization *** macroscale model of the TPB specimen is constructed by a topology structure of ECPL cells to predict the mechanical *** TPB experiments have been performed to validate the multiscale *** the experimental and numerical results reveal that delamination mainly appears in the top and bottom interfaces of the CFRP *** matrix cracking and delamination are identified as the significant damage modes during the TPB ***,the quasi-static and dynamic behaviors of plain woven composites are discussed by comparing the results of Low-Velocity Impact(LVI)and TPB simulations.

关键词： Equivalent Cross-Ply Laminate(ECPL)cell Local homogenization Multiscale modeling Plain woven CFRP composites Three-Point Bending(TPB)behavior

Core-shell Prussian blue analogues derived from metal-organic frameworks as efficient electrocatalysts for oxygen evolution reaction

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Nano Research 2023年第3期16卷 3695-3702页

作者： Qing Zhang Hongyan Wang Wenjie Han Lin Yang Yan Zhang Zhengyu Bai Collaborative Innovation center of henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China

Developing high-performance and low-cost electrocatalysts for oxygen evolution reaction(OER)is still a great challenge for water-splitting ***,an innovative metal-organic frameworks(MOFs)hybrid-assisted strategy is reported to synthesize core-shell Co/Mn-ZIF@Fe-Co-Mn Prussian blue analogues(PBAs)toward highly efficient OER electrocatalysts in alkaline *** characterization indicates that the amorphous hydroxide transformed from Co/Mn-ZIF@Fe-Co-Mn PBA(ZIF:zeolitic imidazolate frameworks)during the electrochemical process acted as the electroactive *** from these structural and compositional features,the developed composite delivers a remarkably low overpotential of 270 mV with a current density of 10 mA·cm^(−2)in 1.0 M KOH ***,water splitting is catalyzed to reach a current density of 10 mA·cm^(−2)at 1.62 V.

关键词： core-shell structure metal-organic framework Prussian blue analogues amorphous hydroxide oxygen evolution reaction