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Optically tunable fluorescent carbon nanoparticles and their application in fluorometric sensing of copper ions

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Nano Research 2019年第10期12卷 2576-2583页

作者： Minhuan Lan Shaojing Zhao Shuilin Wu Xiaofang Wei Yanzhao Fu Juanjuan Wu pengfei wang Wenjun Zhang Center of Super-Diamond and Advanced Films(COSDAF)and Department of Materials Science and Engineering City University of Hong KongHongKong SARChina Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University oj TechnologyTianjin 300384China

A series of carb on nano particles(CNPs)with emissi on wavele ngth ranging from 483 to 525 nm were prepared by hydrothermal treatme nt of poly-3-thiopheneacetic acid(PTA)and *** emission wavelength and surface oxidation degree of CNPs were shown to be controllable by simply adjusti ng NaOH *** CNPs prese nted obvious fluoresce nee spectral response toward copper ions(Cu^2+)through static quenching caused synergistically by electron transfer and inner filter *** O-and S-containing groups on the surface of CNPs were dem on strated to be resp on sible for their outsta nding sensing performa *** on that,a CN Ps-based ratiometric fluoresce nt probe for Cu^2+with a high fluoresce nee quenching rate constant of 1.4×10^5 L/mol and a short resp onse time(10 s)was *** practical applications in detecting Cu^2+in pond water and living cells were also dem on strated.

关键词： carbon nano particles tun able fluorometric copper ions

Strong interface interaction and internal electric field promote electron transfer of Bi_(2)O_(2)S/NiFe_(2)O_(4) heterojunction for photocatalytic antibiotic degradation

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Journal of Materials Science & Technology 2023年第27期158卷 145-155页

作者： Shaoxuan Pang Yilin Dong Dongyu Xu Qiuwen wang Weihong Gao Lijun Zhang Kang wang Guangming Zhang Longyi Lv Yuguo Xia Zhijun Ren pengfei wang School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China Tianjin Key Laboratory of Clean Energy and Pollutant Control Tianjin 300401China School of Chemistry and Chemical Engineering National Engineering Research Center for Colloidal MaterialsShandong UniversityJinan 250100China

Heterojunction photocatalysts have shown considerable activities for organic pollutants ***,the faint connection interface and inferior charge shift efficiency critically block the property of heterojunction ***,Bi_(2)O_(2)S/NiFe_(2)O_(4) nanosheets heterojunction with ultrastrong inter-face interaction and high internal electric field are designed by an in-situ growth *** and theoretical consequences prove that the interfacial interaction and internal electric field not only act as the electron flow bridge but also decrease the electrons shift energy obstacle,thus speeding up electrons transfer and achieving effective spatial electron-hole ***,a large amount of·O_(2)^(-)and holes as active species were ***,Bi_(2)O_(2) S/NiFe_(2)O_(4) establishes a considerably boosted photocatalytic performance for tetracycline degradation(0.032 min^(-1)),which is about 14.2-fold and 7.8-fold of the pristine BOS and NFO,*** work provides a promising motivation for modulating charge transfer by interface control and internal electric field to boost photocatalytic performance.

关键词： Bi_(2)O_(2)S/NiFe_(2)O_(4) S-scheme heterojunction Ultrastrong interface interaction Internal electric field Active species Photocatalytic degradation

An Introduction to the Integrated Climate Model of the Center for Monsoon System Research and Its Simulated Influence of El Ni?no on East Asian–Western North Pacific Climate

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Advances in Atmospheric Sciences 2014年第5期31卷 1136-1146页

作者： HUANG Ping wang pengfei HU Kaiming HUANG Gang ZHANG Zhihua LIU Yong YAN Bangliang Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Science State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Science Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Science National Marine Environmental Forecasting Center

This study introduces a new global climate model--the Integrated Climate Model （ICM）--developed for the seasonal prediction of East Asian-western North Pacific （EA-WNP） climate by the Center for Monsoon System Research at the Institute of Atmospheric Physics （CMSR, IAP）, Chinese Academy of Sciences. ICM integrates ECHAM5 and NEMO2.3 as its atmospheric and oceanic components, respectively, using OASIS3 as the coupler. The simulation skill of ICM is evaluated here, including the simulated climatology, interannual variation, and the influence of E1 Nifio as one of the most important factors on EA-WNP climate. ICM successfully reproduces the distribution of sea surface temperature （SST） and precipitation without climate shift, the seasonal cycle of equatorial Pacific SST, and the precipitation and circulation of East Asian summer monsoon. The most prominent biases of ICM are the excessive cold tongue and unrealistic westward phase propagation of equatorial Pacific SST. The main interannual variation of the tropical Pacific SST and EA-WNP climate E1 Nifio and the East Asia-Pacific Pattern--are also well simulated in ICM, with realistic spatial pattern and period. The simulated E1 Nifio has significant impact on EA-WNP climate, as in other models. The assessment shows ICM should be a reliable model for the seasonal prediction of EA-WNP climate.

关键词： Integrated Climate Model (ICM) global climate model E1 Nifio East Asian climate

Acceptor-planarized typeⅠphotosensitizer for lipid droplet-targeted two-photon photodynamic therapy by ferroptosis

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Science China Chemistry 2024年第7期67卷 2392-2402页

作者： Jie Sha Weimin Liu Jiasheng Wu Yanping wang Xuewei Li Haohui Ren Zhi Pang Wenjun Zhang Chun-Sing Lee pengfei wang Key Laboratory of Photochemical Conversion and Optoelectronic Materials CityU-CAS Joint Laboratory of Functional Materials and DevicesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Center of Super-Diamond and Advanced Films&Department of Materials Science and Engineering City University of Hong KongHong KongChina

Two-photon photodynamic therapy(TP-PDT)has garnered significant attention because of its excellent depth of tissue penetration and high spatiotemporal ***,the limited targeting ability and oxygen dependency of photosensitizers(PSs)significantly hinder the effectiveness of photodynamic therapy in hypoxic tumor ***,we designed and synthesized two lipid droplet(LD)-targeted two-photon PSs(TBPCP and TBCP)by reducing benzene rings to achieve“acceptor planarization”.Notably,acceptor planarization not only enhanced the intramolecular charge transfer but also transferred the photochemical reaction from typeⅡ(TBPCP)to typeⅠ(TBCP).Under the irradiation of 940 nm femtosecond pulsed laser,TBPCP and TBCP showed bright two-photon-excited fluorescence and excellent LD targeting in living *** TBPCP(typeⅡPS),the outstanding TP-PDT efficacy of TBCP(typeⅠPS)under hypoxic conditions could be obtained in both cellular experiments and multicellular tumor spheroids(MCTS)***,both TBPCP and TBCP could induce the lipid peroxidation in the typeⅠor typeⅡPDT due to the location of LD,depleting GSH and inactivating GPX4 to induce nonprogrammed ferroptosis in cells.

关键词： two-photon photodynamic therapy lipid droplet targeting acceptor planarization hypoxia tumor ferroptosis

Layered manganese 4-phosphonoisophthalates (4-piH_4) embedding Mn-O chains with metamagnetism in Mn_3(4-piH)_2(H_2O)_3·H_2O

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Science China Chemistry 2012年第6期55卷 1047-1054页

作者： JIN HaoJun wang pengfei BAO SongSong ZHENG LiMin YAO Cheng State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China College of Science Nanjing University of Technology Nanjing 210009 China

Two manganese phosphonates Mn3（4-piH）2（H2O）3·H2O （1） and Mns（4-piH）2（4-piH2）2（phen）2（H2O）4 （2）（4-pill4 = 4-phosphonoisophthalic acid, phen = 1,10-phenanthroline） have been synthesized under hydrothermal conditions in the pres- ence of organic co-ligand. Both compounds exhibit layer structures but with different topologies. In compound 1, a complicated ＂ladder-like＂ chain of {Mn3O3}O2 which contains three- and six-member rings made up of triangular shaped {Mn3O3} tri- mers is found. The chains are linked by the PO3C groups to form an inorganic layer. The phenyl and protonated carboxylate groups are pendent between the layers with extensive hydrogen bonds. In compound 2, tetramers of {MnnO6 } are connected by the { MnO6 } octahedra through corner-sharing to form an infinite chain, which is further bridged by 4-pill3- ligands into a thick hybrid layer. Magnetic measurements reveal that antiferromagnetic interactions are dominant in both compounds. Metamag- netism is observed in compound 1 at low temperature, while no long range ordering is found in compound 2 down to 1.8 K.

关键词： manganese carboxylate-phosphonate coordination polymer magnetic property metamagnetism

Synthesis and properties of binaphthyl chiral thermally activated delayed fluorescence molecules using thioxanthone as acceptor

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Chinese Chemical Letters 2023年第12期34卷 446-451页

作者： Xiangyu Dong Shaogang Shen Yuanyuan Qin Xiaoxiao Hu Honglei Gao Guanhao Liu Teng Ga Zhi Pang pengfei wang Ying wang Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry and Chemical Engineering Suzhou UniversitySuzhou 234000China

The currently reported axial chiral molecules based on the 3,3'-substitution of the binaphthyl skeleton are limited by intrinsic fluorescence properties,resulting in generally low device efficiencies(EQE<5%)of related organic light emitting diodes(OLEDs).Herein,we designed and synthesized four pair of chiral binaphthyl enantiomers(R/S-1-R/S-4)adopting acceptor-donor-donor-acceptor(ADDA)structure by introducing different thioxanthone modification groups on the 3,3'-position of 2,2'-dimethoxy-1,1'-*** them,emitter R/S-2 and R/S-4 obtained by enhancing intramolecular charge transfer exhibited TADF characteristics due to relatively small Est of 0.12eV and 0.17eV,and relatively moderate SOC matrix elements of 0.28 cm^(-1)and 0.10 cm^(-1)between the 1CT and 3LE *** CD spectra of these enantiomers in diluted solutions showed perfect mirror images and reasonable gabs for small organic molecules(10^(-4)-10^(-3)).And the external quantum eficiencies(EQE)of 10.9%and 8.32%for device A and B based on emitter S-2 and S-4 were highest compared with currently reported axial chiral molecules based on the 3,3'-position substitution of binaphthyl skeleton,providing simple molecular design strategies to construct efficient CP-OLED device.

关键词： Thermally activated delayed fluorescence Organic light emitting diodes Binaphthyl skeleton Electronic circular dichroism Circularly polarized luminescence Thioxanthone

The Impact of Urban Expansion on Plant Diversity Change in Karst Regions of Southwest China

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Chinese Geographical Science 2022年第3期32卷 493-505页

作者： YANG Shengtian LI Chaojun LOU Hezhen LUO Ya wang pengfei ZHANG Jun LI Xi WU Xijin College of Water Sciences Beijing Normal UniversityBeijing 100875China College of Geography and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China

Biodiversity is vital for the integrity and stability of ecosystems and sustainable *** regions of Southwest China is featured for undulating and broken karst terrain as well as high plant *** use changes induced by the growing population and expanding human settlement have threatened biodiversity preservation in this ***,the impact of urban expansion on plant diversity remains unclear *** study focuses on how expanding countryside landscapes affect the recovery rate of plant diversity and demonstrate how urban expansion affects plant diversity conservation in karst regions of Southwest *** situ biodiversity investigations and multisource remote sensing images were combined to analyze the role of human settlement evolution in the conservation of plant diversity using descriptive statistics and regression *** vehicle images,historical aerial photographs,and long-term remote sensing images were used to observe the human settlement pattern changes over 40 yr and found that plant diversity is restored faster in countryside ecosystems than in island ecosystems restricted by ***,however,contribute the most to plant diversity conservation in both *** the forest area is stable during urban expansion,massive forest patches play an essential role in plant diversity *** lands and grasslands shrank but with a fragmenting trend,which was conducive to preserving plant diversity,whereas increased and regularized large patches of built-up areas were not beneficial to plant ***,forest protection should be prioritized to coordinate future socioeconomic development and plant diversity conservation in karst and broader ***,large built-up patches should be limited,and the irregularity should be improved during urban *** shaped cultivated land and grassland were suggested to promote biological information exchanges as landscape corridors.

关键词： plant diversity change urban expansion countryside landscapes karst regions remote sensing China

Highly stable organic fluorescent nanorods for living- cell imaging

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Nano Research 2015年第7期8卷 2380-2389页

作者： Minhuan Lan Jinfeng Zhang Xiaoyue Zhu pengfei wang Xianfeng Chen Chun-Sing Lee Wenjun Zhang Center of Super-Diamond and Advanced Films (COSDAF) Department of Physics and Materials Science City University of Hong Kong Hong Kong SAR China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry (TIPC) Chinese Academy of Sciences (CAS) Beijing 100190 China These authors contributed equally to this work.

Metal-free, organic-dye-based fluorescent nanorods were fabricated through a simple solvent-exchange procedure. The as-prepared nanorods exhibit low toxicity to living cells and excellent photostability. Furthermore, they are stable in solutions of various pHs and high ionic strength and in solutions with interfering metal ions. Compared with the free DPP-Br molecules in THF, these nanorods exhibit larger Stokes shift, broader absorption spectra, and greatly improved photostability. We successfully demonstrated the application of the nanorods, including their aforementioned beneficial characteristics, as a good fluorescence probe for bio-imaging.

关键词： cell imaging organic dye, fluorescent nanorods, DPP

Research Progress for the Development of Li-Air Batteries: Addressing Parasitic Reactions Arising from Air Composition

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Energy & Environmental Materials 2018年第2期1卷 61-74页

作者： Xueping Zhang Xiaowei Mu Sixie Yang pengfei wang Shaohua Guo Min Han Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba 3058568Japan

Li-air batteries are an extremely attractive technology for electrical energy storage,especially in long-range electric vehicles,owing to their high theoretical specific ***,many issues still exist before their practical ***,the sole complexity of electrode reaction in Li-air batteries is *** the critical components that influence the electrochemical performance of aprotic Li-air batteries operating in ambient air are *** include the mechanisms and pathways of CO_(2)/Li_(2)CO_(3) and H_(2)O/LiOH,catalysts of CO_(2) reduction/evolution reactions,and reactions between the Li anode and air *** these challenges can be solved,Li-air batteries will soon be realized for practical *** hot topics in field of Li-air batteries should be focused,such as the fundamental mechanism research referring to interfacial reactions of atmosphere components on porous electrode and Li metal anode,high-efficiency solid catalyst design,and discovery of suitable soluble redox mediators.

关键词： electrode attractive realization