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High-yield and low-cost separation of high-purity semiconducting single-walled carbon nanotubes with closed-loop recycling of raw materials and solvents

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Nano Research 2021年第11期14卷 4281-4287页

作者： Fang Liu Xingxing Chen Haoming Liu Jie Zhao Meiqi Xi Hongshan xiao Tongkang Lu Yu Cao Yan Li Lianmao Peng Xuelei Liang center for Carbon-Based Electronics Peking UniversityBeijing100871China Key laboratory for the physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing100871China College of Chemistry and molecular Engineering Peking UniversityBeijing100871China Shanxi Institute for Carbon-Based Thin Film Electronics Peking University(SICTFE-PKU)Taiyuan030012China Taiyuan laboratory for Carbon-Based Thin Film Electronics Taiyuan030012China

Semiconducting single-walled carbon nanotubes (s-SWCNTs) are the foundation of CNT-based electronics and optoelectronics. For practical applications, s-SWCNTs should be produced with high purity, high structural quality, low cost, and high yield. Currently conjugated polymer wrapping method shows great potential to fulfill these requirements due to its advantages of simple operation process, high purity separation, and easy scaling-up. However, only a small portion of both CNTs and polymers go into the final solution, and most of them are discarded after a single use, resulting in high cost and low yield. In this paper, we introduce a closed-loop recycling strategy, in which raw materials (CNTs and polymers) and solvents were all recycled and reused for multiple separation cycles. In each cycle, high-purity (> 99.9%) s-SWCNTs were obtained with no significant change of structural quality. After 7 times of recycling and separation, the material cost was reduced to ∼ 1% in comparison with commercially available products, and total yield was increased to 3.% in comparison with 2%–5% for single cycle separation. Our proposed closed-loop recycling strategy paves the way for low-cost and high-yield mass production of high-quality s-SWCNTs.

关键词： carbon nanotubes closed-loop recycling high-yield low-cost high purity

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Evidence for particle acceleration approaching PeV energies in the W51 complex

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Science Bulletin 2024年第18期69卷 2833-2841页

作者： LHAASO Collaboration zhen Cao F.Aharonian Axikegu Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi W.Bian A.V.Bukevich Q.Cao W.Y.Cao Zhe Cao J.Chang J.F.Chang A.M.Chen E.S.Chen H.X.Chen Liang Chen Lin Chen Long Chen M.J.Chen M.L.Chen Q.H.Chen S.Chen S.H.Chen S.Z.Chen T.L.Chen Y.Chen N.Cheng Y.D.Cheng M.Y.Cui S.W.Cui X.H.Cui Y.D.Cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan J.H.Fan Y.Z.Fan J.Fang J.H.Fang K.Fang C.F.Feng H.Feng L.Feng S.H.Feng X.T.Feng Y.Feng Y.L.Feng S.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.L.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han M.Hasan H.H.He H.N.He J.Y.He Y.He Y.K.Hor B.W.Hou C.Hou X.Hou H.B.Hu Q.Hu S.C.Hu D.H.Huang T.Q.Huang W.J.Huang X.T.Huang X.Y.Huang Y.Huang X.L.Ji H.Y.Jia K.Jia K.Jiang X.W.Jiang Z.J.Jiang M.Jin M.M.Kang I.Karpikov D.Kuleshov K.Kurinov B.B.Li C.M.Li Cheng Li Cong Li D.Li F.Li H.B.Li H.C.Li Jian Li Jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li Y.Z.Li Zhe Li Zhuo Li E.W.Liang Y.F.Liang S.J.Lin B.Liu C.Liu D.Liu D.B.Liu H.Liu H.D.Liu J.Liu J.L.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.Liu Y.N.Liu Q.Luo Y.Luo H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao Z.Min W.Mitthumsiri H.J.Mu Y.C.Nan A.Neronov L.J.Ou P.Pattarakijwanich Z.Y.Pei J.C.Qi M.Y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.W.Shu H.C.Song Yu.V.Stenkin V.Stepanov Y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun J.Takata P.H.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian C.Wang C.B.Wang G.W.Wang H.G.Wang H.H.Wang J.C.Wang Kai Wang Kai Wang L.P.Wang L.Y.Wang P.H.Wang R.Wang W.Wang X.G.Wang X.Y.Wang Y.Wang Y.D.Wang Y.J.Wang Z.H.Wang Z.X.Wang zhen Wang zheng Wang D.M.Wei J.J.Wei Y.J.Wei T.Wen C.Y.Wu H.R.Wu Q.W.Wu S.Wu X.F.Wu Y.S.Wu S.Q.Xi J.Xia G.M.Xiang D.X.{3. G.{3. Y.L.Xin Y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.H.Yan J.Z.Yan T.Yan C.W.yang C.Y.yang F.yang F.F.yang L.L.yang M.J.yang R.Z.yang W.X.yang Y.H.Yao Z.G.Yao L.Q.Yin N.Yin X.H.You Z.Y.You Y.H.Yu Q.Yuan H.Yue H.D.Zeng T.X.Zeng W.Zeng M.Zha B.B.Zhang F.Zhang H.Zhang 不详 Key laboratory of Particle Astrophysics&Experimental physics Division&Computing {3. Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of chinese academy of sciences Beijing 100049China TIANFU Cosmic Ray Research center ChengduChina Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear physics P.O.Box 103980Heidelberg 69029Germany School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China center for Astrophysics Guangzhou UniversityGuangzhou 510006China Tsung-Dao Lee Institute&School of physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute for Nuclear Research of Russian academy of sciences Moscow 117312Russia Hebei Normal University Shijiazhuang 050024China University of Science and Technology of china Hefei 230026China State Key laboratory of Particle Detection and Electronics China Key laboratory of Dark Matter and Space Astronomy&Key laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Research center for Astronomical Computing Zhejiang LaboratoryHangzhou 311121China Key laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China School of physics and Astronomy Yunnan UniversityKunming 650091China Key laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of physics and Astronomy(Zhuhai)&School of physics(Guangzhou)&Sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275GuangdongChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APC UniversitéParis Cité

Theγ-ray emission from the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays(CRs)accelerated by the shock of supernova remnant(SNR)W51C and the dense molecular clouds in the adjacent star-forming region,***,the maximum acceleration capability of W51C for CRs remains *** on observations conducted with the Large High Altitude Air Shower Observatory(LHAASO),we report a significant detection ofγrays emanating from the W51 complex,with energies from 2 to 200 *** LHAASO measurements,for the first time,extend theγ-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of *** combining the"π^(0)-decay bump"featured data from Fermi-LAT,the broadbandγ-ray spectrum of the W51 region can be well-characterized by a simple pp-collision *** observed spectral bending feature suggests an exponential cutoff at~400 TeV or a power-law break at~200 TeV in the CR proton spectrum,most likely providing the first evidence of SNRs serving as CR accelerators approaching the PeV ***,two young star clusters within W51B could also be theoretically viable to produce the most energeticγrays observed by *** findings strongly support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs.

关键词： UHE c-ray Cosmic rays SNR W51C Star clusters

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胶束型磁共振成像分子探针的设计与应用

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波谱学杂志 2021年第4期38卷 474-490页

作者：肖龙朱筱磊韩叶清陈世桢周欣中国科学院精密测量科学与技术创新研究院波谱与原子分子物理国家重点实验室武汉磁共振中心湖北武汉430071 华中科技大学武汉光电国家研究中心湖北武汉430074

飞速发展的分子影像学在肿瘤的早期诊断及检测中发挥着越来越重要的作用.磁共振成像(MRI)是分子影像学的重要分支,具有其他成像技术不可比拟的优越性和广阔的发展前景.它不需要放射性示踪剂,没有电离辐射,具有高的空间、时间分辨率和组... 详细信息

飞速发展的分子影像学在肿瘤的早期诊断及检测中发挥着越来越重要的作用.磁共振成像(MRI)是分子影像学的重要分支,具有其他成像技术不可比拟的优越性和广阔的发展前景.它不需要放射性示踪剂,没有电离辐射,具有高的空间、时间分辨率和组织对比度.近年来,新型磁共振分子探针及成像序列取得了一系列进展,包括环境响应型分子探针、^(19)F成像、^(129)Xe超极化成像以及化学交换饱和转移成像等,进一步拓展了MRI的应用范围.研究和开发靶向性好、弛豫效率高且安全性好的新型多模态MRI造影剂,进一步提高灵敏度是MRI领域的一项重要课题,例如将胶束的特性与一些MRI新方法结合,寻找合适的胶束体系,以提高MRI分子探针的灵敏度;或者引入多模态分子探针,弥补磁共振方法的不足.本文综述了胶束型MRI分子探针核心技术的研究进展与应用,并指出分子影像技术在生物医学工程研究和临床诊断中的重要性.

关键词：分子影像技术磁共振成像(MRI) 多模态成像分子探针胶束

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Recent progress in perovskite solar cells:from device to commercialization

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Science china Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao yang Zhao xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong yang Yongguang Tu xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic physics and Frontiers Science center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China beijing National laboratory for molecular {3. CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China beijing Key laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

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Macroscopic assembled graphene nanofilms based room temperature ultrafast mid-infrared photodetectors

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InfoMat 2022年第6期4卷 129-140页

作者： Li Peng Lixiang Liu Sichao Du Srikrishna Chanakya Bodepudi Lingfei Li Wei Liu Runchen Lai xiaoxue Cao Wenzhang Fang Yingjun Liu Xinyu Liu Jianhang Lv Muhammad Abid Junxue Liu Shengye Jin Kaifeng Wu Miao-Ling Lin Xin Cong Ping-Heng Tan Haiming Zhu Qihua Xiong xiaomu Wang Weida Hu Xiangfeng Duan Bin Yu zhen Xu {3. Xu Chao Gao MOE Key laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang UniversityHangzhouChina School of Micro-nanoelectronics State Key Laboratory of Silicon MaterialsHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC Joint InstituteZhejiang UniversityHangzhouChina State Key laboratory of molecular Reaction Dynamics and Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina State Key laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina Department of Chemistry Zhejiang UniversityHangzhouChina Division of physics and Applied physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore National laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructureSchool of Electronic Science and EngineeringNanjing UniversityNanjingChina State Key laboratory of Infrared physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of Chemistry and Biochemistry California Nanosystems InstituteUniversity of CaliforniaLos AngelesCaliforniaUSA

Graphene with linear energy dispersion and weak electron-phonon interaction is highly anticipated to harvest hot electrons in a broad wavelength ***,the limited absorption and serious backscattering of hot-electrons result in inadequate quantum yields,especially in the mid-infrared ***,we report a macroscopic assembled graphene(nMAG)nanofilm/silicon heterojunction for ultrafast mid-infrared *** assembled Schottky diode works in 1.5-4.0μm at room temperature with fast response(20-3. ns,rising time,4 mm2 window)and high detectivity(1.61011 to 1.9109 Jones from 1.5 to 4.0μm)under the pulsed laser,outperforming single-layer-graphene/silicon photodetectors by 2-8 *** performances are attributed to the greatly enhanced photo-thermionic effect of electrons in nMAG due to its high light absorption(~40%),long carrier relaxation time(~20 ps),low work function(4.52 eV),and suppressed carrier number *** nMAG provides a long-range platform to understand the hot-carrier dynamics in bulk 2D materials,leading to broadband and ultrafast MIR active imaging devices at room temperature.

关键词： graphene nanofilm heterojunction macro-assembly mid-infrared photodetector photothermionic effect

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100 cm^(2) Organic Photovoltaic Cells with 23.Efficiency under Indoor Illumination

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chinese Journal of polymer Science 2022年第8期40卷 979-988,I0011页

作者： Yong Cui Hui-Feng Yao Ye Xu Peng-Qing Bi Jian-Qi Zhang Tao Zhang Ling Hong Zhi-Hao Chen Zhi-Xiang Wei xiao-Tao Hao Jian-Hui Hou laboratory of polymer physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of chinese academy of sciences Beijing100049China CAS key laboratory of nanosystem and hierarchical fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China School of physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China

The application of organic photovoltaic(OPV)cells to drive off-grid microelectronic devices under indoor light has attracted broad *** organic semiconductors intrinsically have less ordered intermolecular packing than inorganic materials,the relatively larger energetic disorder is one of the main results that limit the photovoltaic efficiency of the OPV cells at low carrier ***,we optimize the alkyl chains of non-fullerene acceptors to get suppressed energetic *** find the optimal acceptor DTz-R1 with the shortest alkyl chain has the strongest crystalline property and lowest energetic *** a result,over 26%efficiency is recorded for the 1 cm^(2) OPV cells under a light-emitting diode illumination of 500 *** also fabricate a 100 cm^(2) cell device and get a PCE of 23.0%,which is an outstanding value for large-area OPV *** results suggest that modulation of the energetic disorder is of great importance for further improving the efficiency of OPV cells,especially for indoor applications.

关键词： Organic photovoltaic cells Low light intensity Energetic disorder Energy loss Power conversion efficiency

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Biosafety chemistry and biosafety materials:A new perspective to solve biosafety problems

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Biosafety and Health 2022年第1期4卷 15-22页

作者： Yingjie Yu Jianxun Ding Yunhao Zhou Haihua xiao Guizhen Wu State Key laboratory of Organic-Inorganic Composites Beijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing 100029China Key laboratory of polymer Eco-materials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China c Jilin Biomedical polymers Engineering laboratory Changchun 130022China beijing National laboratory for molecular {3. State Key Laboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of chinese academy of sciences Beijing 100049China NHC Key laboratory of Biosafety National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China

Coronavirus disease 2019(COVID‐19)has rapidly swept around the globe since its emergence near ***,people have failed to fully understand its origin or *** as an international biosafety incident,COVID‐19 has again encouraged worldwide attention to reconsider the importance of biosafety due to the adverse impact on personal well‐being and social *** countries have already taken measures to advocate progress in biosafety‐relevant research,aiming to prevent and solve biosafety problems with more advanced techniques and ***,we propose a new concept of biosafety chemistry and reiterate the notion of biosafety materials,which refer to the interdisciplinary integration of biosafety and chemistry or *** attempt to illustrate the exquisite association that chemistry and materials science possess with biosafety‐science,and we hope to provide a pragmatic perspective on approaches to utilize the knowledge of these two subjects to handle specific biosafety issues,such as detection and disinfection of pathogenic microorganisms,personal protective equipment,vaccine adjuvants and specific drugs,etc..In addition,we hope to promote multidisciplinary cooperation to strengthen biosafety research and facilitate the development of biosafety products to defend national security in the future.

关键词： Biosafety Chemistry Material science Biosafety chemistry Biosafety materials

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Planarized polymer Acceptor Featuring High Electron Mobility for Efficient All-polymer Solar Cells

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chinese Journal of polymer Science 2022年第8期40卷 968-978,I0011页

作者： Feng Liu Ri Sun Cheng-Yu Wang Liang Zhou Wen-Li Su Qi-Hui Yue Shuai Sun Wu-Yue Liu Hai-Jun Fan Wen-Kai Zhang Yun-Long Guo Li-Heng Feng xiao-Zhang Zhu School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan030006China beijing National laboratory for molecular {3. CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China Department of physics and Applied Optics beijing Area Major laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing100875China University of chinese academy of sciences Beijing100049China

Significant progress has been achieved for all-polymer solar cells(APSCs)in the last few years by the use of polymerized small molecular acceptors(PSMAs).Developing high electron mobility polymer acceptors has been considered a feasible solution to further improve the photovoltaic performance of APSCs and fabricate thick film devices,which contributed to roll-to-roll printing *** this work,we designed and synthesized PSV,an A-DA’D-A small molecule acceptor-based PSMA with the vinyl group as a bridged linkage to reduce the steric hindrance between the 1,1-dicyanomethylene-3.indanone(IC)terminal *** comparison with the C-C bond linked polymer acceptor PS,PSV exhibits an almost planar conjugated framework and well-ordered molecular stacking in the thin ***,PSV exhibits superior n-type semiconducting properties with high electron mobility of up to 0.54 cm^(2)·V^(−1)·s^(−1),which is the highest value among reported *** utilizing PM6 as a polymer donor,PSV-based blend forms a favorable nanomorphology and exhibits high and well-balanced hole/electron mobilities,which is beneficial for exciton separation and charge ***,APSCs based on PM6:PSV achieved high power conversion efficiencies of up to 15.73.,with a simultaneously realized high Voc of 0.923.V,Jsc of 23.2 mA·cm^(-2),and FF of *** superior features enable PSV with excellent thickness-insensitive properties and over 13.PCE was obtained at 3.0 *** the best of our knowledge,the high PCE of 15.73.with excellent electron mobility of 0.54 cm^(2)·V^(−1)·s^(−1)is the highest values reported for *** results point to the great significance of developing polymer acceptors with a high electron mobility for boosting the performance of APSCs.

关键词： All-polymer solar cells polymerized small molecular acceptors Planarization Electron mobility Thick film organic solar cells

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利用~1H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质（英文）

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波谱学杂志 2019年第2期36卷 219-224页

作者：陈晓瑛俞刚金毛诗珍刘买利杜有如波谱与原子分子物理国家重点实验室武汉磁共振中心(中国科学院武汉物理与数学研究所)湖北武汉430071 中国科学院大学北京100049

利用1H NMR技术研究了离子/非离子表面活性剂形成的二元混合体系,结果显示表面活性剂的混合导致各组分的临界胶束浓度(CMC)均比各自纯溶液有所降低,用吸附平衡理论清楚地解释了这个现象.通过定量分析,发现不同的表面活性剂混合使得其组... 详细信息

利用1H NMR技术研究了离子/非离子表面活性剂形成的二元混合体系,结果显示表面活性剂的混合导致各组分的临界胶束浓度(CMC)均比各自纯溶液有所降低,用吸附平衡理论清楚地解释了这个现象.通过定量分析,发现不同的表面活性剂混合使得其组分CMC降低的程度各异,可以理解为它们吸附于界面单分子吸附层上的分子之间相互作用的不同(相吸或相斥)引起的.由此揭示了“协同效应”的实质,可以为选择适当的表面活性剂类型和混合比例以达到预期的性能提供有力的参考.

关键词：核磁共振(NMR) 混合表面活性剂临界胶束浓度(CMC) 吸附平衡协同效应

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The inelastic electron tunneling spectroscopy of edge-modified graphene nanoribbon-based molecular devices

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chinese physics B 2017年第2期26卷 141-146页

作者： Zong-Ling Ding Zhao-Qi Sun Jin Sun Guang Li Fan-Ming Meng Ming-Zai Wu Yong-Qing Ma Long-Jiu Cheng xiao-Shuang Chen School of physics and Material Science Anhui University Hefei 230601 China College of Chemistry and Chemical Engineering Anhui University Hefei 230601 China National laboratory of Infrared physics Shanghai Institute for Technical Physics Chinese Academy of Sciences Shanghai 230083 China

The inelastic electron tunneling spectroscopy（IETS） of four edge-modified finite-size grapheme nanoribbon（GNR）-based molecular devices has been studied by using the density functional theory and Green＇s function method. The effects of atomic structures and connection types on inelastic transport properties of the junctions have been studied. The IETS is sensitive to the electrode connection types and modification types. Comparing with the pure hydrogen edge passivation systems, we conclude that the IETS for the lower energy region increases obviously when using donor–acceptor functional groups as the edge modification types of the central scattering area. When using donor–acceptor as the electrode connection groups, the intensity of IETS increases several orders of magnitude than that of the pure ones. The effects of temperature on the inelastic electron tunneling spectroscopy also have been discussed. The IETS curves show significant fine structures at lower temperatures. With the increasing of temperature, peak broadening covers many fine structures of the IETS *** changes of IETS in the low-frequency region are caused by the introduction of the donor–acceptor groups and the population distribution of thermal particles. The effect of Fermi distribution on the tunneling current is persistent.

关键词： inelastic electron tunneling spectroscopy grapheme nanoribbon edge-modification molecular junction

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