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Recent Advances and Progress for the Fabrication and Surface Modification of AIE-active Organic-inorganic Luminescent Composites

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Chinese Journal of Polymer Science 2019年第4期37卷 340-351,I0005页

作者： Liu-Cheng Mao Xiao-Yong Zhang yen wei Department of Chemistry Nanchang University Department of Chemistry and the Tsinghua Center for Frontier Polymer Research Tsinghua University Department of Chemistry and Center for Nanotechnology and Institute of Biomedical Technology Chung-Yuan Christian University

Organic dyes based hybrid organic-inorganic luminescent nanomaterials with high quantum efficiency, good physical or chemical stability, and favorable biocompatibility, have attracted growing attention recently because of their important applications in the areas of biomedical imaging, chemical sensors, and light-emitting diodes(LEDs). Nevertheless, conventional fluorescence molecules suffer from aggregation-caused quenching(ACQ) when they are doped into inorganic nanomaterials. Aggregation-induced emission(AIE) is an abnormal and intriguing fluorescent phenomenon that has aroused increasing interest for various applications especially in biomedical fields. Compared with conventional organic dyes, the AIE-active molecules will emit more intense fluorescence in their aggregates or solid states. It provides an elegant route to overcome the drawbacks of conventional organic molecules. Over the past few decades, the fabrication and surface modification of various organic-inorganic luminescent composites doped with AIE-active molecules have been reported. Therefore, it is highly desirable to summarize these advances. In this review, recent advances and progress in constructing various AIEgens-doped organic-inorganic hybrid nanocomposites and their subsequent surface modification were summarized. We hope this review could further promote the research of AIE-active functional materials.

关键词： Aggregation-induced emission Organic-inorganic luminescent composites Surface modification Biomedical applications

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Photo-responsive liquid crystalline vitrimer containing oligoanilines

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Chinese Chemical Letters 2017年第11期28卷 2139-2142页

作者： Qiaomei Chen yen wei Yan Ji MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology Department of Chemistry Tsinghua University Beijing 100084 China

Liquid crystalline vitimers （LC-vitrimers） can be easily processed into complex three-dimensional configurations. In this paper, we present a photo-responsive LC-vitrimer by simply introducing a photo- thermal agent aniline trimer into the LC-vitrimer system. As aniline trimer acts as a curing agent, it can be homogeneously dispersed in the material, avoiding aggregation which commonly happens to nano- fillers. As a result, the resultant polymer not only can perform three light-controlled functions （welding, healing and shape memory）, but also can be prepared into aligned monodomain LC actuators with strains of about 40%-45%.

关键词： Liquid-crystalline elastomers Oligoanilines Transesterification Photo-thermal effect Actuators

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Feather-like NiCo2O4 self-assemble from porous nanowires as binder-free electrodes for low charge transfer resistance

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Frontiers of Materials Science 2020年第4期14卷 450-458页

作者： Dandan HAN Jinhe wei Shanshan WANG Yifan PAN Junli XUE yen wei College of Chemistry and Pharmaceutical Engineering Jin Institute of Chemical TechnologyJilin 132022China Department of Chemistry and the Tsinghua Center for Frontier Polymer Research Tsinghua UniversityBeiing 100084China

The unique feather-like arrays composing of ultrathin secondary nanowires are fabricated on nickel foam(NF)through a facile hydrothermal ***,the enhancement of electrochemical properties especially the low charge transfer resistance strongly depends on more active sites and porosity of the *** from the unique structure,the optimized NiCo2O4 electrode delivers a significantly lower charge transfer resistance of 0.32Ω and a high specific capacitance of450 Fg^-1 at 0.5 A.g^-1,as well as a superior cycling stability of 139.6%capacitance *** improvement of the electrochemical energy storage property proves the potential of the fabrication of various binary metal oxide electrodes for applications in the electrochemical energy field.

关键词： feather-like NiCo2O4 binder-free electrode charge transfer resistance supercapacitor

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“Living”fluorophores:thermo-driven reversible ACQ-AIE transformation and ultra-sensitive in-situ monitor for dynamic Diels-Alder reactions

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Science China Chemistry 2022年第8期65卷 1532-1537页

作者： Danning Hu Hongye Huang Ruoxin Li Jinying Yuan yen wei Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084China Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Organic fluorophores play essential roles in both academic and applied *** of the fluorescent molecules can be divided into aggregation-caused quenching(ACQ)and aggregation-induced emission(AIE)types based on the diverse emission properties in solution and aggregated ***,a large part of studies focuses on the ACQ-to-AIE one-way transformation and the complex synthesis of chemical bonds is inevitable in all existing *** maximize the advantages of ACQ and AIE types fluorophores and avoid complex chemosynthesis,we propose a facile strategy first realizing the reversible ACQAIE transformation with the dynamic Diels-Alder(DA)***,the fluorescent platform can monitor DA reactions in microscale ultra-sensitively and *** dynamic covalent bonds can help to develop novel fluorophores creatively,and the reversible ACQ-AIE platform is expected to offer fresh insights into the dynamic covalent chemistry.

关键词： Diels-Alder reaction dynamic covalent chemistry aggregation-induced emission aggregation-caused quenching fluorescence sensor reaction monitor

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The first 2D organic-inorganic hybrid relaxor-ferroelectric single crystal

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Science China Chemistry 2023年第2期66卷 466-474页

作者： Wenjuan wei Hongqiang Gao Ming Fang Yang Yang Yan Guan yen wei Yunzhi Tang Department of Chemistry Tsinghua UniversityBeijing100084China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China The Analytical Instrumentation Center of Peking University the Center for Physicochemical Analysis and Measurements in ICCASBeijing100871China

Inorganic relaxor ferroelectric solid solution single crystals are spurring new generations of high performance electromechanical devices,including transducers,sensors,and actuators,due to their ultrahigh electric field induced strain,large piezoelectric constant,high electromechanical coupling factor and low dielectric ***,relaxor ferroelectric single crystals found in organic-inorganic hybrid perovskites are very limited,but achieving these superior properties in them will be of great significance in the design of modern functional ***,here the first two-dimensional(2D)organic-inorganic hybrid relaxor ferroelectric single crystal,[Br(CH_(2))_(3)NH_(3)]_(2)PbBr_(4)(BPA_(2)-PbBr_(4),BPA=3-bromopropylamine),achieves some of superior ***,BPA_(2)-PbBr_(4)reveals a successive relaxor ferroelectric-ferroelectric-paraelectric phase transitions accompanying by a large degree of relaxationΔT_(relax)=61 K and ultralow energy loss(tanδ<0.001).Meanwhile,it exhibits a superior second harmonic generation(SHG)effect with maximum value accounts for 95%of the standard KDP due to great deformation of structure(3.2302×10^(-4)).In addition,temperature dependent luminescence spectra(80-415 K)exhibit fluorescence and phosphorescence overlapping emission originated from inorganic and organic components with the nanosecond-scale short lifetime and the millisecond-scale long lifetime,respectively,and the color of the emitted light is continuously adjustable,which is the first to achieve luminescence and relaxor ferroelectricity compatibility.

关键词： 2D organic-inorganic hybrid perovskites ferroelectrics relaxor ferroelectrics paraelectrics luminescence

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Chitosan-based self-healing hydrogel for bioapplications

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Chinese Chemical Letters 2017年第11期28卷 2053-2057页

作者： Yongsan Li Xing Wang yen wei Lei Tao The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) Department of Chemistry Tsinghua University Beijing Laboratory of Biomedical Materials Beijing University of Chemical Technology

By using an easily available PEG derivative and biopolymer chitosan, a self-healing hydrogel has been facilely prepared through the dynamic Schiff base. This biocompatible self-healing hydrogel can be used for drug-delivery, 3D cell culture and as a basic platform to develop some organic-inorganic biohybrids. This mini-review summarized recent research about that chitosan based self-healing hydrogel and related materials, and discussed some future bio-applications of that hydrogel

关键词： Chitosan Self-healing hydrogel Drug delivery 3D cell culture Organic-inorganic composite

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Training the old dog new tricks: the applications of the Biginelli reaction in polymer chemistry

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Science China Chemistry 2016年第12期59卷 1541-1547页

作者： Yuan Zhao Haibo Wu Zilin Wang yen wei Zhiming Wang Lei Tao Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology(Ministry of Education) Department of ChemistryTsinghua University School of Petrochemical Engineering Changzhou University

Recently, the Biginelli reaction, one of the most famous multicomponent reactions, has been introduced into the polymer chemistry to highly efficiently synthesize some interesting functional polymers. In this mini-review, several applications of the Biginelli reaction in polymer chemistry have been summarized, including polycondensation, post-polymerization modification,one-pot synthesis of well-defined polymer, etc. Meanwhile, the utilization of the Biginelli reaction in material science and chemical biology, and the future development of the Biginelli reaction in polymer chemistry have also been discussed.

关键词： Biginelli reaction functional polymer synthesis polycondensation

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Multifunctional Fluorescent Magnetic Nanoparticles： Synthesis, Characterization and Targeted Cell Imaging Applications

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Chinese Journal of Chemistry 2017年第6期35卷 977-983页

作者： Lilin Zhou, Xiaoyong Zhang Lei Liu yen wei Jinying Yuan Key Lab of Organic Optoelectronic & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China

Multifunctional fluorescent magnetic nanoparticles （Fe3O4@SiO2-PLLA-RhB/FA） with cell recognition ability were synthesized through conjugation of magnetic nanoparticles with folic acid （FA） and Rhodamine B. To verity their potential biomedical applications, biocompatibility as well as cell imaging applications of the multifunctional nanoparticles were further investigated. Results showed that these fluorescent magnetic nanoparticles are well bio- compatible with NIH-3T3 cells and HeLa cells. More importantly, these nanoparticles could be selectively taken up by HeLa cells （FA receptor positive） as evidenced by laser scanning confocal microscopy, suggesting their potential for biological imaging applications. Given their excellent biocompatibility and multifunctional characteristics, weexpect that the fluorescent magnetic nanoparticles could be promising for various biomedical applications.

关键词： fluorescent magnetic particles biological imaging multifunctional biocompatibility

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Recent insights on iron based nanostructured electrocatalyst and current status of proton exchange membrane fuel cell for sustainable transport

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Journal of Energy Chemistry 2022年第6期31卷 466-489,I0013页

作者： Mohamedazeem M.Mohideen Adiyodi Veettil Radhamani Seeram Ramakrishna yen wei Yong Liu Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Department of Physics and Nanotechnology SRM Institute of Science and TechnologyKattankulathur 603203India Center for Nanofibers and Nanotechnology National University of SingaporeSingapore 1157Singapore Department of Chemistry Key Lab of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijing 100084China

Bridging the performance gap of the electrocatalyst between the rotating disk electrode(RDE) and membrane electrode assembly(MEA) level testing is the key to reducing the total cost of proton exchange membrane fuel cell(PEMFC) vehicles. Presently, platinum metal accounts for ~42% of the total cost of the PEMFC vehicles for usage in the cathode catalyst layer, where the sluggish oxygen reduction reaction(ORR) occurs. An alternative to the platinum catalyst, the Fe-N-C catalyst has attracted considerable interest for PEMFC due to its cost-effectiveness and high catalytic activity towards ORR. However, the excellent ORR activity of Fe-N-C obtained from RDE studies rarely translates the same performance into MEA operating conditions. Such a performance gap is mainly attributed to the lack of atomic-level understanding of Fe-N-C active sites and their ORR mechanism. Besides, unless the cost of expensive electrocatalyst is reduced, the total operation cost of the PEMFC vehicles remains constant. Therefore,developing highly efficient Fe-N-C catalysts from academic and industrial perspectives is critical for commercializing PEMFC vehicles. Here, the scope of the review is three-fold. First, we discussed the atomiclevel insights of Fe-N-C active sites and ORR mechanism, followed by unraveling the different iron-based nanostructured ORR electrocatalysts, including oxide, carbide, nitride, phosphide, sulfide, and singleatom catalysts. And then we bridged their ORR catalytic performance gap between the RDE and MEA tests for real operating conditions of PEMFC vehicles. Second, we focused on bridging the cost barriers of PEMFC vehicles between capital, operation, and end-user. Finally, we provided the path to achieve sustainable development goals by commercializing PEMFC vehicles for a better world.

关键词： Proton exchange membrane fuel cell(PEMFC) Active sites Iron-based nanostructure Sustainable development goals

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Cellulose-based hydrogels regulated by supramolecular chemistry

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SusMat 2021年第2期1卷 266-284页

作者： Danning Hu Min Zeng Yafei Sun Jinying Yuan yen wei Department of Chemistry Key Lab of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijingP.R.China Department of Chemistry Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of EducationTsinghua UniversityBeijingP.R.China Department of Chemistry Center for Nanotechnology and Institute of Biomedical TechnologyChung-Yuan Christian UniversityChung-LiTaiwanP.R.China

Supramolecular hydrogels based on cellulose attract increasing attention because of their novel structures and broad potential *** this review,hydrogels composed of cellulose are summarized according to category of supramolecular interactions in the networks including hydrogen bonds,electrostatic interactions,host-guest interactions,and *** cellulose-based hydrogels constructed by noncovalent bonding usually exhibit environmental friendliness,designing flexibility and diverse functions,and their properties are variable with incorporating different interactions in hydrogel ***,with proper structures and networks,the supramolecular cellulose-based hydrogels are adaptable in diverse fields of research and practical applications,such as self-healing,shape memory,drug delivery,and some other renewable/sustainable *** future developments and challenges of the supramolecular hydrogels based on cellulose are discussed as well.

关键词： cellulose hydrogels noncovalent bonds self-healing shape memory supramolecular chemistry

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