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Dynamic photoluminescence switching of carbon nitride thin films for anticounterfeiting and encryption

Chinese Journal of Structural Chemistry 2024年第10期43卷 49-54页

作者： Hang Meng Bicheng Zhu Ruolun Sun Zixuan Liu Shaowen Cao Kan Zhang Jiaguo Yu Jingsan Xu School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneQueensland4000Australia Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Materials Science and Key Laboratory of Automobile Materials MOEState Key Laboratory of Superhard MaterialsJilin UniversityChangchun130012China

Photoluminescence(PL)has been increasingly applied in anticounterfeiting and encryption as counterfeiting becomes more ***,common luminescent encryption techniques are based on static PL mea-surements and are easy to *** this work,we have developed a thermal vapor deposition(TVD)approach using melem as the unique starting material to synthesize highly homogeneous carbon nitride(CN)thin films featuring unique dynamic PL switching *** being irradiated by a white LED,the blue PL in-tensity of the CN film increases significantly and then fades in darkness,demonstrating excellent *** results prove that CN films contain cyano groups in the structure,and density functional theory(DFT)calculations indicate that the integration of cyano groups results in traps within the bandgap of CN,sug-gesting that the dynamic PL switching effect is essentially associated with the fullness of the trap *** have therefore developed an advanced luminescent device for the secure transmission of encrypted information through controlled *** can be easily read with a portable UV(365 nm)lamp and effectively erased using the white LED,thereby preventing information leakage and showing great potential for many applications.

关键词： Thermal vapor deposition Carbon nitride film Dynamic photoluminescence Encryption

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Bioprocess-inspired Actin Biomineralized Hematite Mesocrystals for Energy Storage

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Journal of Wuhan University of technology(materials Science) 2023年第6期38卷 1299-1303页

作者： XU Wei ZHAO Chao XIE Jingjing WANG Rongjie Tianjin Institute of Power Sources Tianjin 300384China CETC LAN TIAN Technology Co. Ltd.Tianjin 300384China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Biomineralization is a biological process of synthesizing inorganic minerals within *** has been found that intracellular proteins are involved in the room temperature synthesis process of anatase Ti O2in living ***,we used intracellular actin to synthesize hematite by *** hematite has a nano spindle structure with a particle size of approximately 150 *** microstructure indicates that the prepared hematite is a mesocrystals composed of ordered arrangement and assembly of primary *** addition,hematite mesocrystals exhibit good lithium storage performance as electrode materials for lithium *** discharge specific capacity of the battery remained at 560.7 m Ah·g^(-1)after 130 cycles at a current density of 200 m A·g^(-1).This work expands the synthesis methods of hematite by biomineralization,and provides a new strategy for preparing inorganic materials by intracellular proteins.

关键词： actin hematite biomineralization mesocrystals lithium battery

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Effect of Y:Zn ratio on microstructure and emission of Er^(3+)/Yb^(3+) codoped Y_(2)O_(3)-ZnO ceramic phosphors

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Journal of Rare Earths 2023年第12期41卷 1883-1894,I0003页

作者： Boxu Xu Chao Song Jie Song Rui Huang Shaomin Lin Zhenxu Lin Yi Zhang Dejian Hou Jun Song School of Materials Science and Engineering Hanshan Normal UniversityChaozhou521041China Key Laboratory of Optoelectronic Devices and Systemsof MinistryofEducation and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

In this study,Er^(3+)/Yb^(3+)codoped Y_(2)O_(3)-ZnO ceramic phosphors were prepared by sol-gel *** samples had two emission bands,namely,green(535 nm) and red(660 nm),which are attributed to Er^(3+):^(2)H_(11/2)(^(4)S_(3/2))→^(4)I_(15/2)and Er^(3+):^(4)F_(9/2)→^(4)I_(15/2)radiative transitions,*** samples exhibited green-and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y2O3host,respectively and by 514.468 and 214.341 times that of the pure ZnO *** emission intensities are first enhanced by lattice *** the change of Y:Zn ratio,the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for *** the intensity of the asymmetric crystal field reaches maximum,both emissions are further *** the high surface energy transforms into crystal surface energy,the microstructure changes into a compact mesoporous ***,the chemical stability of the samples improves significantly,and the final emission band of the three samples with mesoporous structures is continuously red.

关键词： Mesoporous Y_(2)0_(3) Zno Luminescence Rare earths Ceramic phosphors

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ZnIn_(2)S_(4)/MOF S-scheme photocatalyst for H_(2)production and its femtosecond transient absorption mechanism

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Journal of materials Science & technology 2024年第30期197卷 183-193页

作者： Jiajie Cai Bowen Liu Shumin Zhang Linxi Wang Zhen Wu Jianjun Zhang Bei Cheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of Geosciences68 Jincheng StreetWuhan 430078China Department of Chemical Engineering Ordos Institute of TechnologyOrdos 017000China

Photocatalytic water splitting is a popular pathway for H_(2)evolution,but the slow water oxidation greatly hampers the overall *** harness photogenerated holes in an efficient and lucrative way,the wa-ter oxidation reaction is replaced by selective oxidation of organic compounds to achieve simultaneous production of H_(2)and value-added ***,an alternative tactic is reported where an organic compound(benzylamine,BA)not only serves as the precursor for N-benzylidene-benzylamine(NBBA)production but also provides hydrogen sources for H_(2)evolution,achieving the goal under anhydrous *** process is realized using an S-scheme photocatalyst composed of ZnIn_(2)S_(4)and the UiO-66-NH_(2)(U6N)metal-organic framework(MOF).The S-scheme carrier transfer mechanism was validated by in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS)and femtosecond transient absorption(fs-TA)*** increased carrier efficiency and reinforced redox power endowed by the S-scheme heterojunction,the composite performed better than ZnIn2 S4 and *** performance was further ameliorated by Pt-cocatalyst modification,achieving an H_(2)production rate of 5275μmol h^(-1)g^(-1)as well as BA conversion of 94.3%with 99.3%NBBA *** studies reveal that BA is ini-tially oxidized to carbon-centered radicals and further to imines along with the release of *** imine reacts with another BA molecule to form NBBA,while the protons are reduced to H_(2).This work provides new insights into concurrent photocatalytic H_(2)production and selective organic oxidation from organic amines using S-scheme photocatalysts.

关键词： Photocatalysis S-scheme heterojunction Hydrogen production Selective oxidation Benzylamine Femtosecond transient absorption

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Weakly solvating electrolyte enabling solvent-free co-intercalation for stable potassium-ion storage in graphite

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Nano Research 2025年第3期18卷 234-242页

作者： Chaojie Cheng Wencong Feng Feiyue Wang Jingke Ren Deyang Guan Wei Chen Jean-Jacques Gaumet Kai Fu Xiaobin Liao Wen Luo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Xinjiang UniversityUrumqi 830017China Laboratoire de Chimie et Physique:Approche Multi-échelles des Milieux Complexes(LCP-A2MC)Institut Jean BarriolUniversitéde LorraineMetz 57070France

Ether electrolytes for potassium-ion batteries exhibit a broader electrochemical window and greater applicability,yet most of them are high-concentration electrolytes with elevated *** this study,we propose the use of a weakly solvating cyclic ether electrolyte with tetrahydropyran(THP)as the *** approach induces the formation of a thin and dense inorganic-rich solid electrolyte interphase(SEI)film,which is accompanied by a decrease in the activation energy of electrode interfacial reactions due to the weak ligand binding of THP with K^(+).Density functional theory(DFT)simulations also corroborate the hypothesis that K^(+)has a lower binding energy with *** potassium storage process,the phenomenon of solvent co-intercalation of graphite does not occur,which greatly reduces the destruction of the graphite structure and enables a superior electrochemical performance and enhanced cycling stability at a lower concentration(2 M).At a current density of 0.2 C(55.8 mA·g^(-1)),the battery can be stably cycled for 800 cycles(approximately 8 months)with a specific capacity of 171.8 mAh·g^(-1).This study provides a new ether-based electrolyte for potassium ion batteries and effectively reduces the electrolyte cost,which is expected to inspire further development of energy storage batteries.

关键词： weakly solvating electrolyte co-intercalation graphite potassium ion batteries

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying Cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei Cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs).However,the diverse structure of donors and acceptors makes the research *** with customizable structures and properties could simplify this ***,we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT)and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT),possessing distinct intermolecular interaction features to elaborate the inherent *** is found that varied interaction strengths can alter film formation *** enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F,facilitating the formation of films with compact molecular packing and decent phase ***,exciton dissociation and charge transport become more ***,devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35%in small-area OSCs and 14.11%in bladecoated 5 cm×5 cm organic solar ***,OSCs can maintain 80%of their initial efficiency after continuous annealing at 85℃for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

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The role of γ/γ interfacial spacing on the tensile behavior in lamellar TiAl alloy via molecular dynamics simulations

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Acta Mechanica Sinica 2025年第2期41卷 1-6页

作者： Xiong Zhou Shiping Wang Zhongtao Lu Xiege Huang Xiaobin Feng Jiayi Fu Wenjuan Li Pengcheng Zhai Guodong Li Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The lamellar microstructure is one of the most typical microstructures of TiAl *** are threeγ/γinterfaces with different microstructures in lamellarγ-TiAl *** this work,we investigated the deformation processes of lamellarγ-TiAl alloys with different interfacial spacing(λ)via uniaxial tensile loading using molecular dynamics simulations,including true twin(TT),pseudo-twin(PT),rotational boundary(RB),and the mixed structure(TT∥PT∥RB).The results show that in all lamellarγ-TiAl samples,the Shockley partial dislocation prefers to nucleate in the region between two neighboring ***,dislocations move towards,crossing theγ/γ***,the dislocation slippage leads to the destruction of the interface,resulting in cracks and structural *** the decrease ofλ,the ultimate strength slightly increases in the TT or PT structure ofγ-TiAl,which follows the Hall-Petch *** in general,the interfacial spacing has a slight effect on the ultimate strengths of these four structures ofγ-TiAl.

关键词： Lamellarγ-TiAl alloys γ/γinterface Ultimate strength Interfacial spacing

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Mg-gallate metal-organic framework-based sprayable hydrogel for continuously regulating oxidative stress microenvironment and promoting neurovascular network reconstruction in diabetic wounds

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Bioactive materials 2024年第8期38卷 181-194页

作者： Chenxi Lian Jiawei Liu Wenying Wei Xiaopei Wu Takashi Goto Haiwen Li Rong Tu Honglian Dai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies FoshanXianhu LaboratoryFoshan528200China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000China

Chronic diabetic wounds are the most common complication for diabetic *** to high oxidative stress levels affecting the entire healing process,treating diabetic wounds remains a ***,we present a strategy for continuously regulating oxidative stress microenvironment by the catalyst-like magnesium-gallate metal-organic framework(Mg-GA MOF)and developing sprayable hydrogel dressing with sodium alginate/chitosan quaternary ammonium salts to treat diabetic *** quaternary ammonium salts with antibacterial properties can prevent bacterial *** continuous release of gallic acid(GA)effectively eliminates reactive oxygen species(ROS),reduces oxidative stress,and accelerates the polarization of M1-type macrophages to M2-type,shortening the transition between inflammation and proliferative phase and maintaining redox ***,magnesium ions adjuvant therapy promotes vascular regeneration and neuronal formation by activating the expression of vascular-associated *** hydrogel dressings with antibacterial,antioxidant,and inflammatory regulation rapidly repair diabetic wounds by promoting neurovascular network reconstruction and accelerating re-epithelialization and collagen *** study confirms the feasibility of catalyst-like MOF-contained sprayable hydrogel to regulate the microenvironment continuously and provides guidance for developing the next generation of non-drug diabetes dressings.

关键词： Chronic diabetic wounds Bioactive MOF Antioxidant Anti-inflammation Enzymatic catalysis Neurovascular network reconstruction

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Swarming magnetic photonic-crystal microrobots withon-the-fly visual pH detection and self-regulated drug delivery

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InfoMat 2023年第10期5卷 64-79页

作者： Zheng Yu Luolin Li Fangzhi Mou Shimin Yu Di Zhang Manyi Yang Qing Zhao Huiru Ma Wei Luo Tianlong Li Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of TechnologyWuhanthe People's Republic of China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbinthe People's Republic of China Wuhan Institute of Photochemistry and Technology Wuhanthe People's Republic of China

Swarming magnetic micro/nanorobots hold great promise for biomedical applications,but at present suffer from inferior capabilities to perceive and respond to chemical signals in local *** we demonstrate swarming magnetic photonic crystal microrobots(PC-bots)capable of sponta-neously performing on-the-fly visual pH detection and self regulated drug delivery by perceiving local pH *** magnetic PC-bots consist of pH-responsive hydrogel microspheres with encapsulated one-dimensional periodic assemblies of Fe3O4 *** programming extemnal rotating magnetic fields,they can self-organize into large swarms with much-enhanced collective velocity to actively find targets while shining bright“blinking”structural *** approaching the target with abnormal pH conditions(*** ulcerated superficial tumor lesion),the PC-bots can visualize local pH changes on the fly via pH-responsive structural colors,and realize self-regulated release of the loaded drugs by recognizing local *** work facilita tes the develop-ment of intelligent micro/nanorobots for active“motile-targeting”tumor diag-nosis and treatment.

关键词： collective behaviors drug delivery micro/nanorobots on-the-fly sensing responsivephotonic crystals

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Exploring the Core-shell Structure of BaTiO3-based Dielectric Ceramics Using Machine Learning Models and Interpretability Analysis

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Journal of Wuhan University of technology(materials Science) 2024年第3期39卷 561-569页

作者：孙家乐 XIONG Peifeng 郝华 LIU Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringInternational School of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya 572000China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

A machine learning(ML)-based random forest(RF)classification model algorithm was employed to investigate the main factors affecting the formation of the core-shell structure of BaTiO_(3)-based ceramics and their interpretability was analyzed by using Shapley additive explanations(SHAP).An F1-score changed from 0.8795 to 0.9310,accuracy from 0.8450 to 0.9070,precision from 0.8714 to 0.9000,recall from 0.8929 to 0.9643,and ROC/AUC value of 0.97±0.03 was achieved by the RF classification with the optimal set of features containing only 5 features,demonstrating the high accuracy of our model and its high *** the interpretability analysis of the model,it was found that the electronegativity,melting point,and sintering temperature of the dopant contribute highly to the formation of the core-shell structure,and based on these characteristics,specific ranges were delineated and twelve elements were finally obtained that met all the requirements,namely Si,Sc,Mn,Fe,Co,Ni,Pd,Er,Tm,Lu,Pa,and *** the process of exploring the structure of the core-shell,the doping elements can be effectively localized to be selected by choosing the range of features.

关键词： machine learning BaTiO_(3) core-shell structure random forest classifier

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