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Unveiling size-fluorescence correlation of organic nanoparticles and its use in nanoparticle size determination

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Aggregate 2024年第1期5卷 331-336页

作者： Wu-Jie Guo Shixiang Ma Hui Wang Lu Qiao Lei Chen Chenyu Hong Bin liu Xiaoyan Zheng Hui-Qing Peng State key laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina key laboratory of Cluster Science of Ministry of Education Beijing Key Laboratory of Photoelectronic/Electro-photonic Conversion MaterialsKey Laboratory of Medicinal Molecule Science and Pharmaceutics Engineering of Ministry of Industry and Information TechnologySchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijingChina

Quantitatively establishing the correlation between nanoparticle size and fluorescence is essential for understanding the behavior and functionality of fluorescent nanoparticles(FNPs).However,such exploration focusing on organic FNPs has not been achieved to ***,we employ the use of supramolecular polymeric FNPs prepared from tetraphenylethylene-based bis-ureidopyrimidinone monomers(bis-UPys)to relate the size to the fluorescence of organic *** an equal concentration of bis-UPys,a logarithmic relationship between them is built with a correlation coefficient higher than *** calculations indicate that variations in fluorescence intensity among FNPs of different sizes are attributed to the distinct molecular packing environments at the surface and within the interior of the *** leads to different nonradiative decay rates of the embedded and exposed bis-UPys and thereby changes the overall fluorescence quantum yield of nanoparticles due to their different specific surface *** established fluorescence intensity-size correlation possesses fine universality and reliability,and it is successfully utilized to estimate the sizes of other nanoparticles,including those in highly diluted dispersions of *** work paves a new way for the simple and real-time determination of nanoparticle sizes and offers an attractive paradigm to optimize nanoparticle functionalities by the size effect.

关键词： aggregation-induced emission fluorescence detection fluorescent nanoparticle nanoparticle size supramolecular polymer

Ultrahigh Density Modulation of Aligned Single-Walled Carbon Nanotube Arrays

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Nano Research 2011年第10期4卷 931-937页

作者： Bin Wu Dechao Geng yunlong Guo Liping Huang Jianyi Chen yunzhou Xue {2. yu yunqi liu Hisashi Kajiura Yongming Li beijing national {2. for molecular sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Material laboratory Sony Corporation Atsugi Tec. No.2 4-16-10kata Atsugi Kanagawa 243-0021 Japan These authors contributed equally to this work.

Controlling the densities of aligned single-walled carbon nanotube arrays （SWNTs） on ST-cut quartz is a critical step in various applications of these materials. However the growth mechanism for tuning SWNT density using the chemical vapor deposition （CVD） method is still not well understood, preventing the development of efficient ways to obtain the desired results. Here we report a general ＂periodic＂ approach that achieves ultrahigh density modulation of SWNT arrays on ST-cut quartz substrates--with densities increased by up to -60 times compared with conventional methods using the same catalyst densities--by varying the CH4 gas ＂off＂ time. This approach is applicable to a wide range of initial catalyst densities, substrates, catalyst types and growth conditions. We propose a general mechanism for the catalyst size-dependent nucleation of SWNTs associated with different free carbon concentrations, which explains all the observations. Moreover, the validity of the model is supported by systematic experiments involving the variation of key parameters in the ＂periodic＂ CVD approach.

关键词： SWNT density chemical vapor deposition periodic growth growth mechanism

Bifunctional bridging capping layer enables 2..5% efficiency of perovskite solar cells with polymer-based hole transport materials

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Science china chemistry 2024年

作者： Can Zhu Yiyang Wang Lei Meng Beibei Qiu Jing Li Shucheng Qin Ke Hu Xin Jiang Wenbin Lai Minchao liu Zhe liu Chenxing Lu Jin{2.an Zhang Yongfang Li beijing national {2. for molecular sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences School of Chemical Science University of Chinese Academy of Sciences key laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information EngineeringZhejiang Normal University key laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of Sciences laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow University

Developing a bridge capping layer between perovskite and hole transport layer materials(HTMs) in the n-i-p perovskite solar cells(pero-SCs) is an effective approach to modify the morphology of HTMs and passivate the perovskite ***, we select the quinoxaline-based bifunctional passivation agent, quinoxalin-6-yl-methylamine hydrochloride(QxMACl),as the bridging layer, and a D-A copolymer PBQ12.containing the same quinoxaline unit as an HTM for the n-i-p pero-SCs. Due to the π-π stacking among the common quinoxaline units in the bridge layer and HTM, QxMACl induces the π-π stacking of the PBQ12.film and improves the film morphology of HTMs with better conductivity. Additionally, QxMACl can effectively passivate the perovskite surface, and PBQ12.possesses appropriate energy levels and high hole mobility. The pero-SCs based on FAPbI3with PBQ12.QxMACl treatment showed a higher power conversion efficiency(PCE) of 2..05% and outstanding stability, maintaining 95.4% and 92.1% of its initial PCE after 750 h of storage and after over 800 h of thermal annealing at85 °C, respectively. To further enhance the PCE of the PBQ12.QxMACl-based devices, we developed a non-metal ion dopant for the PBQ12.HTM. Through trace doping of PBQ12.HTM by the non-metal ion dopant, the PCE of the PBQ12.QxMACl-based devices reached 2..2.%(the calibrated PCE of 2..55% by the national institute of Metrology,{2.).

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Photoelectron Imaging Spectroscopy of ZrO-Diatomic Anion

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chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Qing-yu liu Lian-rui Hu Hui Chen Sheng-{2. He beijing national {2. for molecular sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing 100190China beijing national {2. for molecular sciences Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

The diatomic ZrO− anion has been prepared by laser ablation and studied by photoelectron imaging spectroscopy combined with quantum chemistry calculations. The observed photoelectron spectra can be well assigned on the basis of reported optical spectroscopy and high-level ab initio calculations. The ground state of ZrO− is a 2. state with spin-orbit splitting of 578±12.cm−1. The electron affinity of ZrO is 1.2.9±0.005 eV. For the first time, the c3∑− state of ZrO has been experimentally observed at 13316±2. cm−1 with respect to the X1∑+ ground state. A comparison between ZrO and the isoelectronic molecule NbN has been made.

关键词： Diatomic molecules Electronic structure Spin-orbit splitting Photoelectron imaging spectroscopy ab initio calculations

Minimizing Purifi cation-Induced Defects in Single-Walled Carbon Nanotubes Gives Films with Improved Conductivity

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Nano Research 2009年第11期2卷 865-871页

作者： yu Wang Liping Huang yunqi {2. Dacheng Wei Hongliang Zhang Hisashi Kajiura Yongming Li beijing national {2. for molecular sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Materials Laboratories Sony CorporationOkataAtsugi CityKanagawa 243-0021Japan

A method for the non-destructive purification of single-walled carbon nanotubes(SWNTs)using classical coordination chemistry to remove the metal catalyst has been *** preliminary tests,the conductivity of films based on the resulting SWNTs was markedly better than that of films prepared from SWNTs purified by treatment with oxidizing acid *** transparent and conducting SWNT films have potential applications in optoelectronic devices.

关键词： Carbon nanotube film conductivity transparency coordination chemistry

The Porous Nanocarbons with Polynuclear Aromatic Cores

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CCS chemistry 2024年第10期6卷 2427-2438页

作者： Chenxi Zhou Ruoning Li Yan Chen Xinyue liu Haisong Zhao Xue-Qing Yang Zhongjie Ren Dong Wang Zhaohui Wang Lei Zhang beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Lab of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029 CAS key laboratory of {2. Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190 key laboratory of {2. Optoelectronics and molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084

Three porous nanocarbons,1–3 that comprise pyrene,corannulene,and coronene cores encircled by cyclo-meta-phenylene(CMP)interconnections,have been synthesized and *** interconnected CMPs caused different curvatures of the cores and imparted high solubility,large bathochromic shift,strong fluorescence,and low reduction potential to the *** solution,these porous nanocarbons existed as a complex mixture of dynamic processes that certainly influenced one another within any single molecule,leading to a set of rather simple proton nuclear magnetic resonance(^(1)H NMR)*** crystal X-ray diffraction and computational minimum energy analysis revealed the boatand saddle-like conformations of 1–3 in the solid state,significantly deviating from their conformations on the Au(111)***,both 1 and 2.could form 2.1 complexes with C_(60),accompanied by adaptive geometry *** addition,1 served as a sky-blue emitter for an organic light-emitting diode(OLED).This work gives access and insights into a model system consisting of porous nanocarbons with intriguing supra{2. and optoelectronic properties.

关键词： porous nanocarbon cyclophenylenes aromatic core structural dynamics crystal packing

Tuning Reaction Processes for the Synthesis of Micron and Nanometer Sized, Single Crystalline Lamellae of Copper 7,7,8,8-tetracyano-p-quinodimethane (Phase II) with Large Area

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Nano Research 2009年第8期2卷 630-637页

作者： Yaling liu Zhuoyu Ji Hongxiang Li Wenping Hu {2. liu Daoben Zhu beijing national {2. for molecular sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China national Center for Nanoscience and Technology Beijing 100190China Department of Compound Semiconductor Devices and Circuit Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

Two simple methods have been demonstrated to obtain large area,single crystalline lamellae of copper-7,7,8,8-tetracyanoquinodimethane(CuTCNQ).The formation of the lamellae was a result of fine tuning of the processes during the synthesis processes of CuTCNQ phase *** facile synthesis of large area single crystalline lamellae suggests bright prospects for the study and understanding of the electrical switching of CuTCNQ by using single crystals of its phase II,and future applications of the material in memory and switching devices.

关键词： CuTCNQ lamellae single crystals phase II

Studies of non-covalent interactions between ATP and N-phosphoryl amino acids by ESI-MS/MS and theoretical calculaions

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Studies of non-covalent interactions between ATP and N-phosp...

Advances in flexible organic field-effect transistors and their applications for flexible electronics

第六届全国化学生物学学术会议

作者： Jihong liu~(a,b),Shuxia Cao~(a,*),Daxiong Hanc,Zhiping Zeng~c,Jiansha Lu~a,Xincheng Liao~a,yufen Zhaoa,~(c,d*) a key laboratory of Chemical Biology and organic chemistry,Department of chemistry,Zhengzhou University,Zhengzhou,450052,P R.china b Research Center of Agricultural Quality Standards and Testing Techniques,Henan academy for Agricultural sciences,Zhengzhou,450002,P R.china c The key laboratory for Chemical Biology of Fujian Province,Department of chemistry and College of chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,P R china d The key laboratory of Bioorganic Phosphorus Chemisty & Chemical Biology,Ministry of Education, Department of chemistry,Tsinghua University,beijing,100084,P R.china

＜正＞molecular recognition of ATP by proteins,a subject of great importance for understanding enzymatic mechanisms and for drug design,is the research focus of many scientists all over the worlds. However,it is difficult to study the interaction between ATP and proteins directly for the large molecular mass of *** is worth noting that phosphoryl amino acids have many interesting

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npj Flexible Electronics 2022年第1期6卷 1-19页

作者： Kai liu Bang Ouyang Xiaojun Guo yunlong Guo {2. liu beijing national {2. for molecular sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences100190 BeijingPeople’s Republic of China School of Chemical sciences University of Chinese Academy of Sciences100049 BeijingPeople’s Republic of China Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University200240 ShanghaiPeople’s Republic of China

Flexible electronics have suggested tremendous potential to shape human lives for more convenience and *** efforts have been devoted to developing flexible organic field-effect transistor(FOFET)technologies for rollable displays,bendable smart cards,flexible sensors and artificial ***,these applications are still in a nascent stage for lack of standard highperformance material stacks as well as mature manufacturing *** this review,the material choice and device design for FOFET devices and circuits,as well as the demonstrated applications are summarized in ***,the technical challenges and potential applications of FOFETs in the future are discussed.

关键词： effect field devoted