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Super-resolution imaging and tracking of TGF-β receptor II on living cells

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Science Bulletin 2016年第8期61卷 632-638页

作者： Zi Ye Nan Li Libo Zhao Yahong Sun Hefei Ruan Mingliang Zhang Jinghe Yuan Xiaohong Fang key laboratory of molecular nanostructure and nanotechnology Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences

Single-particle tracking photoactivated local- ization microscopy （sptPALM） has recently emerged as a powerful tool for high-density imaging and tracking of individual molecules in living cells. In this work, we have monitored and compared the diffusion dynamics of TGF-β type II receptor （TβRII） at high expression level using both traditional single-particle tracking （SPT） and sptPALM. The ligand-induced aggregation of TβRII oligomers was further indicated by sptPALM. Due to the capacity of distinguishing and tracking single molecules within diffraction limit, sptPALM outperforms traditional SPT by providing more accurate biophysical information,

关键词： Single-particle tracking Photoactivatedlocalization microscopy - Single-moleculefluorescence imaging TGF-β receptor II Membranediffusion

DNA nanomachines: monitoring molecular encounter dynamics in live cell membranes

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National Science Review 2018年第3期5卷 300-301页

作者： Jiachao Xu Xiaohong Fang Beijing National laboratory for molecular sciences Key Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences University of chinese academy of sciences

The cell membrane features a variety of heterogeneous and dynamic compartments to regulate cell structure and *** compartments are generally classified into a relatively packed,lipidordered(Lo)domain(10-200 nm)enriched in saturated lipids and cholesterol,and a more fluid,liquid-disordered(Ld)domain comprising mainly unsaturated lipids[1].According to the lipid raft theory,Lodomains,which selectively recruit specific lipids and proteins,serve as criti-

关键词： DNA nanomachines monitoring molecular encounter dynamics in live cell membranes

Two-dimensional chiral molecular assembly on solid surfaces:formation and regulation

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National Science Review 2015年第2期2卷 205-216页

作者： Ting Chen Dong Wang Li-Jun Wan key laboratory of molecular nanostructure and nanotechnology and Beijing National laboratory for molecular sciences Institute of ChemistryChinese Academy of Sciences

The expression of chirality in 2D molecular assemblies on solid surfaces has unique features compared to the analogous process in 1D and 3D supramolecular assemblies. Understanding the formation of chiral molecular assemblies on surfaces not only provides insight into the origin and transfer of chirality in many enantioselective processes, but also aids rational design and construction of chiral architectures and materials. his present contribution reviews recent studies on how chirality is induced and expressed on the surface at diferent levels, both from intrinsically chiral and achiral molecules. Furthermore, we discuss the regulation efect of some pivotal factors, for example, the chemical structure, the chiral auxiliary molecules,and the assembled environments, on the expression of chirality in molecular assembly.

关键词： surface chirality molecular assembly scanning tunneling microscopy

Carbon-free Cu_2ZnSn(S,Se)_4 film prepared via a non-hydrazine route

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Science China Chemistry 2014年第11期57卷 1552-1558页

作者： ZOU YuGang LIU Jie ZHANG Xing JIANG Yan HU JinSong WAN Li-Jun Beijing National laboratory for molecular sciences CAS key laboratory of molecular nanostructure and nanotechnology Institute of Chemistry Chinese Academy of Sciences

The kesterite Cu2ZnSn(S,Se)4(CZTSSe) is an ideal candidate for light harvesting materials in earth-abundant low-cost thinfilm solar cells(TFSC). Although the solution-based processing is a most promising approach to achieve low-cost solar cells with high power conversion efficiency, the issues of poor crystallinity and carbon residue in CZTSSe thin films are still challenging. Herein, a non-hydrazine solution-based method was reported to fabricate highly crystallized and carbon-free kesterite CZTSSe thin films. Interestingly, it was found that the synthetic atmosphere of metal organic precursors have a dramatic impact on the morphology and crystallinity of CZTSSe films. By optimizing the processing parameters, we were able to obtain a kesterite CZTSSe film composed of compact large crystal grains with trace carbon residues. Also, a viable reactive ion etching(RIE) processing with optimized etching conditions was then developed to successfully eliminate trace carbon residues on the surface of the CZTSSe film.

关键词： CZTS CZTSSe solar cells carbon non-hydrazine

Optoeletronic investigation of Cu2ZnSn(S,Se)4 thin-films ＆ Cu2Zn Sn(S,Se)4/CdS interface with scanning probe microscopy

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Science China Chemistry 2016年第2期59卷 231-236页

作者： Jiangjun Li Yugang Zou Ting Chen Jinsong Hu Dong Wang Li-Jun Wan Beijing National laboratory for molecular Science Key Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

The kesterite-structured semiconductor Cu_2 Zn Sn(S,Se)_4(CZTSSe) is prepared by spin coating a non-hydrazine precursor and annealing at Se atmosphere. Local electrical and optoelectronic properties of the CZTSSe thin-film are explored by Kelvin probe force microscopy and conductive atomic force microscopy. Before and after irradiation, no marked potential bending and very low current flow are observed at GBs, suggesting that GBs behave as a charge recombination site and an obstacle for charge transport. Furthermore, Cd S nano-islands are synthesized via successive ionic layer adsorption and reaction(SILAR) method on the surface of CZTSSe. By comparing the work function and current flow change of CZTSSe and Cd S in dark and under illumination, we demonstrate photo-induced electrons and holes are separated at the interface of p-n junction and transferred in Cd S and CZTSSe, respectively.

关键词： CZTSSe CdS GBs heterojunction KPFM c-AFM

Nanoscale imaging with an integrated system combining stimulated emission depletion microscope and atomic force microscope

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chinese Science Bulletin 2013年第33期58卷 4045-4050页

作者： YU JianQiang YUAN JingHe ZHANG XueJie LIU JianLi FANG XiaoHong Beijing National laboratory for molecular sciences Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of Sciences

We have built an integrated imaging system by combining stimulated emission depletion(STED)microscope and atomic force microscope(AFM).The STED microscope was constructed based on the supercontinuum fiber laser and a super lateral resolution of42 nm was *** this integrated imaging system,morphological features,mechanical parameters and fluorescence super resolution imaging were obtained simultaneously for both nanobeads and fixed cell *** new integrated imaging system is expected to obtain comprehensive information at the nanoscale for studies in nanobiology and nanomedicine.

关键词：原子力显微镜成像系统集成系统受激发射纳米级损耗光纤激光器横向分辨率

Controlled synthesis of hierarchically-structured MnCo_2O_4 and its potential as a high performance anode material

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Science China Chemistry 2017年第9期60卷 1180-1186页

作者： Zixiao Wu Fuhai Li Yonggang Sun Deshan Bin Junyu Piao Xijie Lin Xiaochan Liu Anmin Cao Li-Jun Wan CAS key laboratory of molecular nanostructure and nanotechnology and CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of chinese academy of sciences Beijing 100049China

To satisfy the upsurging demand for energy storage in modern society,anode materials which can deliver high capacity have been intensively researched for the next generation lithium ion ***,the binary MnCo_2O_4 with a characteristic coupled metal cations showed promising potential due to its high theoretical capacity and low ***,by means of a well-designed synthesis control,we demonstrated a scalable process to achieve a hierarchical structure of MnCo_2O_4,which existed as uniform microspheres with embedded mesopores,showing favorable structural characters for high performance during a fast charge/discharge *** synthesis highlighted the importance of sodium salicylate as an essential additive to control the precipitation of the two involved metal *** was proved that a dual role was played sodium salicylate which cannot only facilitate the formation of microspheric shape,but also act as an effective precursor for the creation of inner *** confirmed that the hierarchically-structured MnCo_2O_4 showed outstanding performance when it was tested as an anode material in lithium ion batteries as revealed by its extraordinary cycling stability and high rate capability.

关键词： hierarchical structure anode materials MnCo2O4 lithium ion batteries porous structure

Advanced transition metal/nitrogen/carbon-based electrocatalysts for fuel cell applications

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Science China Chemistry 2020年第11期63卷 1517-1542页

作者： Tang Tang Liang Ding Zhe Jiang Jin-Song Hu Li-Jun Wan Beijing National laboratory for molecular sciences CAS Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of chinese academy of sciences Beijing 100049China

The development of advanced transition metal/nitrogen/carbon-based(M/N/C)catalysts with high activity and extended durability for oxygen reduction reaction(ORR)is critical for platinum-group-metal(PGM)free fuel cells but still remains great *** this review,we summarize the recent progress in two typical M/N/C catalysts(atomically dispersed metal-nitrogen-carbon(M-N-C)catalysts and carbon-supported metal nanoparticles with N-doped carbon shells(M@NC))with an emphasis on their potential applications in fuel *** with understanding the active sites in these two types of catalysts,the representative innovative strategies for enhancing their intrinsic activity and increasing the density of these sites are systematically *** synergistic effects of M-N-C and M@NC are subsequently discussed for those M/N/C catalysts combining both of *** translate the material-level catalyst performance into high-performance devices,we also include the recent progress in engineering the porous structure and durability of M/N/C catalysts towards efficient performance in fuel cell *** the viewpoint of industrial applications,the scale-up cost-effective synthesis of M/N/C catalysts has been lastly *** this knowledge,the challenges and perspectives in designing advanced M/N/C catalysts for potential PGM-free fuel cells are proposed.

关键词： electrocatalysis ORR metal-nitrogen-carbon M@NC fuel cells oxygen reduction

Studies on the Luminescence Property of Yttrium-Based Metallofullerenes

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chinese Journal of Structural Chemistry 2022年第9期41卷 1-7页

作者： Jiayi Liang Chunru Wang Taishan Wang Beijing National laboratory for molecular sciences Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBejing 100190China

Endohedral metallofullerenes(EMFs) exhibit various properties due to their multiple combinations between internal metals and outer carbon cages. Among them, yttrium-based metallofullerenes have attracted much attention due to their luminescence properties. For example,YN@Cis distinguished by its photoluminescence(PL) properties with a small energy gap between the lowest singlet states(S) and the triplet excited states(T) in YN@C, allowing reverse intersystem crossing(RISC) of T→Sand resulting in thermally activated delayed fluorescence(TADF). In addition, the PL intensity, lifetime, and quantum yield(QY) of YN@Call depend on the molecular structure and surrounding environment. Typically, modulation of the PL properties can be achieved by replacing the yttrium metal inside the carbon cage as well as by modifying the carbon cage ***, we focus on the luminescence properties of yttrium-based metallofullerenes, summarize recent research advances, and predict their future development.

关键词： metallofullerenes yttrium luminescence thermally activated delayed fluorescence phosphorescence