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Photoluminescence of CdTe quantum dots ligated with caprylic acid synthesized at low temperature

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International Journal of Smart and Nano Materials 2011年第2期2卷 51-58页

作者： ming-qiang zhu Li Peng ming-Feng zhu Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science&TechnologyHuazhong University of Science&TechnologyWuhan430074China

Photoluminescent semiconductor nanocrystals or quantum dots(QDs)are usually produced using expensive ligands and solvents at high temperature above 280◦C to ensure high-quality optical properties,particularly the photoluminescence of *** reproducibility of highly stable photoluminescence in QD preparation,in most cases,varies depending on many effects,such as the ligand used and *** a facile preparation of photoluminescent semiconductor CdTe nanocrystals or quantum dots(QDs)is conducted in the presence of caprylic acid at moderate temperatures between 80–140◦C,which are much lower than the high temperatures used in conventional organic-phase preparation of CdTe *** results show that the optical properties of CdTe QDs depend considerably on the reaction time,temperature and ligand used.

关键词： photoluminescence cadmium telluride quantum dot caprylic acid ligand

Life-cycle assessment and techno-economic analysis of the production of wood vinegar from Eucommia stem: a case study

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Frontiers of Chemical Science and Engineering 2023年第8期17卷 1109-1121页

作者： Ji-Lu Zheng Ya-Hong zhu Yan-Yan Dong ming-qiang zhu College of Forestry Northwest A&F UniversityYangling 712100China College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China

This research undertook a case study of the life-cycle assessment and techno-economic analysis of the slow pyrolysis of Eucommia stem for the production of wood vinegar and activated *** results showed that the production of one ton of wood vinegar via the slow pyrolysis of Eucommia stem show comparatively low global warming potential(2.37×10^(2) kg CO_(2) eq),primary energy demand(3.16×10^(3) MJ),acidification potential(2.19 kg SO2 eq),antimony depletion potential(3.86×10^(–4) kg antimony eq),and ozone depletion potential(7.46×10^(–6) kg CFC-11 eq)and was more environmentally friendly than the production of dilute acetic acid(12 wt%)via petrochemical ***,the total capital investment,total product cost,and cash flowsheet were provided in the techno-economic ***,the net present value,internal rate of return,and dynamic payback period of the production process were *** findings indicated that while this production process is cost-effective,it might not be economically attractive or could generate investment *** increase in the added value of the wood vinegar and the activated carbon could remarkably improve the economic feasibility of this production process.

关键词： life-cycle assessment techno-economic analysis wood vinegar activated carbon Eucommia

Editorial-Introduction to the special issue on super-resolution optical microscopy

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Journal of Innovative Optical Health Sciences 2016年第3期9卷 1-3页

作者： Zhen-Li Huang ming-qiang zhu Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology Wuhan 430074 P.R.China Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology Wuhan 430074 P.R.China

Super-resolution optical microscopy,sometimes called optical nanoscopy,refers to a new kind of far-¯eld optical microscopy which allows optical imaging with a resolution higher than the well-known resolution limit(or the Abbe di®raction limit)which stood for more than a *** reported approaches that break the resolution limit involve either e®ectively reducing the focus region of the excitation light or stochastic separation and precise localization of single°***-resolution optical microscopy provides unprecedented opportunities for tackling outstanding fundamental questions in life science,medicine,materials,and many others that require non-invasive imaging with molecular level spatial resolution.

关键词： resolution limit precise

Fe-N_(x) sites coupled with core-shell FeS@C nanoparticles to boost the oxygen catalysis for rechargeable Zn-air batteries

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Journal of Energy Chemistry 2024年第3期90卷 565-577,I0013页

作者： Katam Srinivas zhuo Chen Anran Chen Fei Ma ming-qiang zhu Yuanfu Chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina

The development of efficient single-atom catalysts(SACs) for the oxygen reduction reaction(ORR)remains a formidable challenge,primarily due to the symmetric charge distribution of metal singleatom sites(M-N_(4)).To address such issue,herein,Fe-N_(x) sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution,thus enhancing the intrinsic catalytic ***,atomically dispersed Fe-N_(x) sites supported on N/S-doped mesoporous carbon(NSC)coupled with FeS@C core-shell nanoparticles(FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent *** to the presence of an in situ-grown conductive graphitic layer(shell),the FeS nanoparticles(core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling ***,FAS-NSC@950displays a more positive half-wave potential(E_(1/2)) of 0.871 V with a significantly boosted ORR kinetics(Tafel slope=52.2 mV dec^(-1)),outpacing the commercial Pt/C(E_(1/2)=0.84 V and Tafel slope=54.6 mV dec^(-1)).As a bifunctional electrocatalyst,it displays a smaller bifunctional activity parameter(ΔE) of 0.673 V,surpassing the Pt/C-RuO_(2) combination(ΔE=0.724 V).Besides,the FAS-NSC@950-based zincair battery(ZAB) displays superior power density,specific capacity,and long-term cycling performance to the Pt/C-Ir/C-based *** work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR,with potential implications for energy conversion and storage technologies.

关键词： Fe-N_(x)sites Core-shell FeS@C Synergistic interactions Oxygen reduction reaction Zn-air battery

Geminal Cross Coupling (GCC) Reaction for AIE Materials

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Chinese Journal of Polymer Science 2019年第4期37卷 327-339,I0005页

作者： Qi Yu Ya-Long Wang Ze-qiang Chen Peng-Ju Zhao Cheng Fan Chong Li ming-qiang zhu Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and Technology

Tetraphenylethylene(TPE) derivatives are typical aggregation-induced emission(AIE) molecules, which have been widely investigated and applicated. The Rathore's procedures and McMurry reaction are the two frequently used methods for synthesizing the TPE derivatives. The complex processes and low tolerance of active function groups make the TPE with limited structures and properties in some degree. Very recently, a novel strategy, named geminal cross coupling(GCC) reaction, is developed for designing and synthesizing various topological small molecules and polymers with rich optical properties beyond simple TPE compounds, and becomes a powerful synthesis method to AIE materials. This review overviews the current progresses of AIE molecules and polymers prepared by GCC as well as their applications. We believe that GCC reaction will have a bright future in the development of the next generation of tetraarylethylene(TAE)-kind AIE materials.

关键词： GCC reaction AIE Tetraarylethylene Conjugated polymer Imaging

Synthesis of Fluorene-Bridged Arylene Vinylene Fluorophores： Effects of End-Capping Groups on the Optical Properties, Aggregation Induced Emission

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Chinese Journal of Chemistry 2015年第8期33卷 939-947页

作者： Guo-Feng Zhang Tao Chen Ze-qiang Chen Matthew P. Aldred Xianggao Meng ming-qiang zhu Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan Hubei 430074 China Department of Chemistry Durham University South Road Durham DH1 3LE UK Key Laboratory of Pesticide and Chemical Biology of Ministry of Education College of Chemistry Central China Normal University Wuhan Hubei 430079 China

We have synthesized a series of fluorene-based fluorophores, in which a central fluorene core has been modified with different peripheral arylene vinylene substituents that are able to activate aggregation-induced emission （AIE） characteristics. 9,9-Dioctylfluorene doubly end-capped at the 2,7-positions with triphenylethene groups, such as 4-（2,2-diphenylvinyl）phenyl （F1-（2,2）-HTPE） and 4-（1,2-dipbenylvinyl）phenyl （F1-（1,2）-HTPE） were synthesized and compared to the tetraphenylethene analogue （F1-TPE）. Both FI-（2,2）-HTPE and F1-（1,2）-HTPE glow with a deep blue fluorescence in THF solution with emission maxima （λem） of 426 and 403 nm, respectively. The λem slightly red-shifts in the solid-state to 458 nm for F 1-（2,2）-HTPE and 437 nm for F 1-（1,2）-HTPE. The fluorescence quantum yields （ΦF） of F1-（2,2）-HTPE （ΦF=35.1%） and FI-（1,2）-HTPE （ΦF=26.2%） were found to be higher in solution compared to the near quenching of F 1-TPE （ΦF = 0.1%）. Consequently, this results in weaker AIE-stability of F1-（2,2）-HTPE （αAIE= 1.5） and F1-（1,2）-HTPE （αAIE=1.9） compared to F1-TPE （αAIE=125）, suggesting that four phenyl groups are necessary for efficient AIE-activity of these fluorene bridged arylene vinylene type materials In addition, decreasing the steric hindrance around the arylene vinylene moiety by removal of a phenyl ring is an- other method to decrease the AIE characteristics, in a similar manner to the commonly known ＂phenyl-locking＂. Non-polar triphenylethenes are poorer AlE materials than their tetraphenylethene analogues. Replacing the hydro- gen atom of F1-（2,2）-HTPE with a cyano group affords fluorene end-capped with 2,3,3-triphenylacrylonitrile （F1-TPAN）, which boosts the AIE-effect to αAIE=90.5 and red-shifts the solid-state emission （λem=528 nm） with near quenching in THF solution （ΦF= 0.12%）. X-ray crystallographic analysis of F1-TPAN indicates that the intro- duction of cyano groups can not only diminish the intramolecular steric hindrance in comparison of F1-TPE, but

关键词： aggregation-induced emission fluorene triphenylethene tetraphenylethene 2,3,3-triphenylacrylonitrile

PHOTOSWITCHABLE NANOFLUOROPHORES FOR INNOVATIVE BIOIMAGING

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Journal of Innovative Optical Health Sciences 2011年第4期4卷 395-408页

作者： ming-qiang zhu GUO-FENG ZHANG CHONG LI YA-JING LI MATTHEW PALDRED ALEXANDER D.Q.LI Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Department of Chemistry Washington State University PullmanWA 99164USA

Photosensitive fluorescent probes have become powerful tools in chemical biology and molecular biophysics,which are used to investigate cellular processes with high temporal and spatial ***,photosensitive fluorescent probes,including photoactivatable,photoconvertible,and photoswitchable fluorophores,have been extensively developed during the past *** photoswitchable fluorophores have received much attention because they highlight cellular events *** minireview summarizes recent advances of using reversibly photoswitchable fluorophores and their applications in innovative *** fluorophores include photoswitchable fluorescent proteins,photoswitchable fluorescent organic molecules(dyes),and photoswitchable fluorescent *** strategies have been developed to synthesize photoswitchable fluorophores,including engineering combination proteins,chemical synthesis,polymerization,and *** we concentrate on polymer nanoparticles with optically switchable emission properties:either fluorescence on/offor dualalternating-color fluorescence *** essential mechanisms of fluorescence photoswitching enable different types of photoswitchable fluorophores to change emission intensity or wavelength(color)and thus validating the basis of the fluorescence on/offor dual-color photoswitching *** the possible applications of any fluorophores are to label biological targets,followed by specific *** newly developed photoswitchable fluorophores enable super-resolution fluorescence imaging because of their photosensitive ***,we summarize the important area regarding future research and development on photoswitchable fluorescent nanoparticles.

关键词： Fluorescent molecular switches polymer nanoparticles two-photon two-photon imaging spiropyran

NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries

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Journal of Energy Chemistry 2024年第1期88卷 260-271,I0007页

作者： Fei Ma zhuo Chen Katam Srinivas Ziheng Zhang Yu Wu Dawei Liu Hesheng Yu Yue Wang Xinsheng Li ming-qiang zhu Qi Wu Yuanfu Chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and TechnologyChengdu 610054SichuanChina College of Science and Institute of Oxygen Supply Center of Tibetan Studies(Everest Research Institute)Tibet UniversityLhasa 850000TibetChina College of Mechanical and Electronic Engineering Northwest A&F UniversityXianyang 712100ShaanxiChina

The shuttle effect of lithium polysulfides(LiPSs)and uncontrollable lithium dendrite growth seriously hinder the practical application of lithium-sulfur(Li-S)*** simultaneously address such issues,monodispersed Nb N quantum dots anchored on nitrogen-doped hollow carbon nanorods(NbN@NHCR)are elaborately developed as efficient Li PSs immobilizer and Li stabilizer for high-performance Li-S full *** functional theory(DFT)calculations and experimental characterizations demonstrate that the sulfiphilic and lithiophilic NbN@NHCR hybrid can not only efficiently immobilize the soluble Li PSs and facilitate diffusion-conversion kinetics for alleviating the shuttling effect,but also homogenize the distribution of Li+ions and regulate uniform Li deposition for suppressing Li-dendrite *** a result,the assembled Li-S full batteries(NbN@NHCR-S||Nb N@NHCR-Li)deliver excellent long-term cycling stability with a low decay rate of 0.031%per cycle over 1000 cycles at high rate of 2 *** at a high S loading of 5.8 mg cm^(-2)and a low electrolyte/sulfur ratio of 5.2μL mg^(-1),a large areal capacity of 6.2 mA h cm^(-2)can be achieved in Li-S pouch cell at 0.1 *** study provides a new perspective via designing a dual-functional sulfiphilic and lithiophilic hybrid to address serious issues of the shuttle effect of S cathode and dendrite growth of Li anode.

关键词： Dual-functional host NbN quantum dots Shuttle effect Dendrite-free Li anode Li-S full batteries

Super-Resolution Fluorescent Imaging for Self-assembly of Amphiphilic Organic Molecules and Block Copolymers

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Super-Resolution Fluorescent Imaging for Self-assembly of Am...