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Phase-modulated quantum-sized TMDs for extreme saturable absorption

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Nano Research 2023年第4期16卷 5803-5808页

作者： Zhexue Chen xinyu sui Zhangqiang Li Yueqi Li Xinfeng Liu Yong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

Two-dimensional semiconductors such as transition metal dichalcogenides(TMDs)have attracted much interest in the past decade.Herein,we present an all-physical top-down method for the scalable production of the intrinsic TMD quantum sheets(QSs).The phases of the TMDs(e.g.,2H-MoSe_(2),2H-WSe_(2),and Td-WTe2)remain stable during the transformation from bulk to QSs.However,phase transition(from Td to 2H)is detected in MoTe2.Such phase-modulation by size-reduction has never been reported before.The TMD QSs can be well dispersed in solvents,resulting in remarkable photoluminescence with excitation wavelength-,concentration-,and solvent-dependence.Meanwhile,the TMD QSs can be readily solution-processed into hybrid thin films,which demonstrate exceptional nonlinear saturation absorption(NSA).Notably,2H-MoTe2 QSs in poly(methyl methacrylate)show extremely high NSA performance with(absolute)modulation depth up to 46.6%and saturation intensity down to 0.81 MW·cm^(−2).Our work paves the way towards quantum-sized TMDs.

关键词： transition metal dichalcogenides(TMDs) intrinsic quantum sheets photoluminescence nonlinear saturation absorption

Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

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Nano Research 2023年第7期16卷 10420-10428页

作者： Yige Yao Xiaotian Bao Yunke Zhu xinyu sui An Hu Peng Bai Shufeng Wang Hong Yang Xinfeng Liu Yunan Gao State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Frontiers Science Center for Nano-optoelectronics Beijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Dalian National Laboratory for Clean Energy Dalian 116023China

Charge carrier dynamics essentially determines the performance of various optoelectronic applications of colloidal semiconductor nanocrystals.Among them,two-dimensional nanoplatelets provide new adjustment freedom for their unique core/crown heterostructures.Herein,we demonstrate that by fine-tuning the core size and the lateral quantum confinement,the charge carrier transfer rate from the crown to the core can be varied by one order of magnitude in CdSe/CdSeS core/alloy-crown nanoplatelets.In addition,the transfer can be affected by a carrier blocking mechanism,i.e.,the filled carriers hinder further possible transfer.Furthermore,we found that the biexciton interaction is oppositely affected by quantum confinement and electron delocalization,resulting in a non-monotonic variation of the biexciton binding energy with the emission wavelength.This work provides new observations and insights into the charge carrier transfer dynamics and exciton interactions in colloidal nanoplatelets and will promote their further applications in lasing,display,sensing,etc.

关键词： nanoplatelets core/crown charge carrier transfer ultrafast spectroscopy biexciton

Investigation of charge transfer between donor and acceptor for small-molecule organic solar cells by scanning tunneling microscopy and ultrafast transient absorption spectroscopy

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Nano Research 2022年第9期15卷 8019-8027页

作者： Yuchuan Xiao Linxiu Cheng xinyu sui Qi Wang Jie Chen Dan Deng Jianqi Zhang Xuan Peng Xiaokang Li Xunwen Xiao Ke Deng Xinfeng Liu Zhixiang Wei Qingdao Zeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Jiangxi Provincial Key Laboratory of Low-Carbon Solid Waste Recycling School of Geography and Environmental EngineeringGannan Normal UniversityGanzhou 341000China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China College of Chemistry and Chemical Engineering Gannan Normal UniversityGanzhou 341000China School of Materials and Chemical Engineering Ningbo University of TechnologyNingbo 315211China

Small-molecule organic solar cell is a category of clean energy potential device since charge transfers between donor and acceptor.The morphologies,co-assembly behavior,interaction sites,and charge transfer of BTID-nF(n=1,2)/PC71BM donor-acceptor system in the active layer of organic solar cell have been studied employing scanning tunneling microscopy(STM),scanning tunneling spectroscopy(STS),density functional theory(DFT)calculations,and transient absorption(TA)spectroscopy.The results show that BTID-1F and BTID-2F form bright strip structures,whereas BTID-nF(n=1,2)/PC71BM form ridge-like structures with each complex composed of one BTID-nF(n=1,2)molecule and four PC71BM molecules which adsorbed around the BTID-nF(n=1,2)molecule by S···πinteraction.With the assistance of S···πinteraction between BTID-nF(n=1,2)and PC71BM,BTID-nF(n=1,2)/PC71BM co-assembled ridge-like structures are more stable than the BTID-nF(n=1,2)ridge structures.To investigate the charge transfer of BTID-nF(n=1,2)/PC71BM system,STS measurements,DFT calculation,and TA spectroscopy are further performed.The results show that charge transfer occurs in BTID-nF(n=1,2)/PC71BM system with the electron transferring from BTID-nF(n=1,2)molecules to PC71BM.

关键词： organic solar cells scanning tunneling microscopy transient absorption spectroscopy charge transfer donor-acceptor system

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气冷微堆动态特性分析与稳态运行方案设计

核动力工程 2024年第1期45卷 139-144页

作者：邱磊磊范遂魏新宇廖圣勇孙培伟西安交通大学核科学与技术学院西安710049 中国核电工程有限公司北京100840

气冷微堆是一个高度集成的系统,所涉及的设备是高度耦合和相互约束的。文章通过理论推导,建立了5 MW气冷微堆的动态仿真模型,并分析了系统的动态特性,在此基础上提出了气冷微堆稳态运行方案设计方法。模型稳态计算结果与设计值的相对误... 详细信息

气冷微堆是一个高度集成的系统,所涉及的设备是高度耦合和相互约束的。文章通过理论推导,建立了5 MW气冷微堆的动态仿真模型,并分析了系统的动态特性,在此基础上提出了气冷微堆稳态运行方案设计方法。模型稳态计算结果与设计值的相对误差小于1%,瞬态计算结果与实验结果趋势一致,流量最大误差小于0.53 kg/s,压力最大误差小于0.027 MPa。稳态运行方案为:在50%FP~100%FP(FP为满负荷)负荷水平,随负荷的减小,反应堆出口氦气温度和转子转速保持不变;在0%FP~50%FP负荷水平,随负荷的减小,反应堆出口氦气温度和转速线性减小;在0%FP~100%FP负荷水平,预冷器和间冷器出口氦气温度不变。所提出的稳态运行方案保证了气冷微堆在大范围变工况时安全、稳定和高效地运行。

关键词：气冷微堆动态仿真模型动态特性稳态运行方案

CH_(3)I sensing using yttrium single atom-doped perovskite nanocrystals

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Nano Research 2023年第7期16卷 10429-10435页

作者： Xiaowei Feng Yuanlong Qin Rui sui Guo Wang xinyu Zhang xinyu Liu Jiajing Pei Di Liu Zhengbo Chen Department of Chemistry Capital Normal UniversityBeijing 100048China Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100029China

Nanocrystals(NCs)of cesium lead halide perovskites are optically unstable,which prevents their use in optical sensors.The combination of perovskite NCs and metal single atoms(SAs)may be a good solution to this issue.Unfortunately,depositing metal SAs on perovskite NCs remains a challenge due to relative weak metal-halide bonds.Herein,we present that,via a photo assisted method using cesium lead halide perovskite NCs as host material to anchor Y single atoms,we successfully synthesize Y SA anchored CsPbBr_(3)NCs(Y-SA/CsPbBr_(3)NCs)with outstanding fluorescence stability through the formation of two Y-O bonds and two Y-Br bonds.In comparison to bare CsPbBr_(3)NCs,Y-SA/CsPbBr_(3)NCs possess more stable optical characteristics.The as-synthesized Y-SA/CsPbBr_(3)NCs can be employed as a colorimetric platform to perform rapid CH_(3)I sensing.Detection limit of 0.044 ppm is exhibited in this approach with excellent anti-interference performance.The YSA/CsPbBr_(3)NCs-based system has been applied to the detection of CH_(3)I in sweet potato samples with satisfying results.

关键词： cesium lead halide perovskites Y single atoms fluorescence stability CH_(3)I sensing

短期饮食限制对小鼠肝脏胰岛素信号通路与线粒体的影响

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中国兽医学报 2024年第4期44卷 719-727页

作者：王鑫宇刘滢隋昕姜俊男刘涛马玉辉肖建华东北农业大学动物医学院黑龙江省普通高等学校动物普通疾病防治重点实验室黑龙江哈尔滨150030 昭苏县西域马业有限责任公司新疆伊犁835600

选用体质量约42g的昆明小鼠50只,随机分为5组,分别用限时禁食、每日热量限制、隔日禁食、高能量饲料隔日禁食4种饮食限制方法适应性饲养1周后,限制饮食16d。通过葡萄糖耐受试验观察各组小鼠葡萄糖敏感性情况;对各组小鼠肝脏组织HE染色... 详细信息

选用体质量约42g的昆明小鼠50只,随机分为5组,分别用限时禁食、每日热量限制、隔日禁食、高能量饲料隔日禁食4种饮食限制方法适应性饲养1周后,限制饮食16d。通过葡萄糖耐受试验观察各组小鼠葡萄糖敏感性情况;对各组小鼠肝脏组织HE染色观察损伤情况;Western blot方法检测肝脏组织各指标的表达情况;免疫荧光化学染色法检测肝脏组织中FOXO1指标的定位情况。结果显示,除了限时禁食组,其他短期饮食限制组均使肝脏肿瘤坏死因子α(TNFα)表达水平与丙二醛(MDA)含量降低,核因子红细胞2相关因子2(NRF2)表达水平增加,B淋巴细胞瘤2关联X蛋白(BAX)、剪切-半胱氨酸蛋白酶蛋白3(cleaved-Caspase-3)、p21、p16的表达水平降低(P<0.05);4种短期饮食限制方法均使腺苷酸活化蛋白激酶(AMPK)磷酸化增加,另外肉毒碱棕榈酰基转移酶1A(CTP1a)、磷脂酰肌醇3激酶(PI3K)、蛋白激酶B(AKT)、视神经萎缩蛋白1(OPA1)、线粒体融合蛋白2(MFN2)、线粒体膜外的胞质动力相关蛋白1(DRP1)蛋白水平也升高,核内叉头框蛋白1(FOXO1)与葡萄糖转运蛋白载体4(GLUT4)水平下降(P<0.05)。结果表明,短期隔日禁食与每日热量限制使肝脏细胞脂肪的沉积减少,肝脏抗氧化能力增强,炎症、细胞凋亡和衰老均减轻;短期饮食限制后,肝脏葡萄糖摄取减少,脂肪酸氧化程度加大,肝脏以脂肪酸为主要的代谢底物;线粒体的融合和分裂均增强,线粒体周转加快;小鼠肝脏胰岛素信号通路敏感性和作用得到增强。

关键词：饮食限制肝脏胰岛素信号通路线粒体小鼠

中古墓葬所见双身连体形象的研究——以高句丽壁画墓与武昌隋唐墓为中心

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南方文物 2024年第2期 183-197页

作者：李钟石周昕语北京大学考古文博学院

高句丽壁画墓葬和武昌隋唐墓都发现与神煞俑相关的双身连体形象。武昌地区随葬神煞俑的习俗可能来自山西、河北地区,该习俗在唐高宗晚期至唐玄宗初年较为流行,基本消失于安史之乱之后。从高句丽壁画墓葬的图像配置来看,地轴(地神)是蕴... 详细信息

高句丽壁画墓葬和武昌隋唐墓都发现与神煞俑相关的双身连体形象。武昌地区随葬神煞俑的习俗可能来自山西、河北地区,该习俗在唐高宗晚期至唐玄宗初年较为流行,基本消失于安史之乱之后。从高句丽壁画墓葬的图像配置来看,地轴(地神)是蕴含着调整土地中心作用的地神,武昌隋唐墓出土的地轴可能与道教雷法相关。这类题材的跨时空出现,表明二者都是以东汉墓葬文化传统为基础而发展起来的。

关键词：双身连体形象神煞俑高句丽壁画墓葬武昌隋唐墓流传演变

Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors

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Science China Chemistry 2019年第7期62卷 897-903页

作者： Lei Yang Linqing Qin Yunxiao Xu Huotian Zhang Lei Lv Kepeng Chen xinyu sui Yangguang Zhong Yuan Guo Feng Gao Jianzhang Zhao Yuhao Li Xinfeng Liu Yuanping Yi Xinhui Lu Aidong Peng Hui Huang College of Materials Science and Optoelectronic Technology Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences Beijing 101408 China Department of Chemical Engineering Imperial College London London SW7 24Z United Kingdom Biomolecular and Organic Electronics Department of Physics Chemistry and Biology (IFM) Linkoping University Linkuping SE-58183 Sweden Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Physics The Chinese University of Hong Kong Shatin NT 999077 Hong Kong China

The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptors BFPSP and BFPTP were reported by simply changing the chalcogen atoms from S to Te. The differences between BFPSP and BFPTP in light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TDDFTcalculations revealed that the triplet excited state(T1) in energy of BFPTP equals to the charge transfer(CT) state in PBDBT:BFPTP, which allows T1 excitons, generated by intersystem crossing, to split into free charges to contribute to the efficiency.This contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.

关键词： heteroatom effects triplet state tellurophene nonfullerene acceptor organic solar cells

De novo creation of popcorn-like fragrant foxtail millet

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Journal of Integrative Plant Biology 2023年第11期65卷 2412-2415页

作者： Yanyan Zhang Qiang He Shihui Zhang xinyu Man Yi sui Guanqing Jia Sha Tang Hui Zhi Chuanyin Wu Xianmin Diao Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Zhongyuan Research Center Chinese Academy of Agricultural SciencesXinxiang 453000China

Aroma plays a crucial role in the sensory appeal and enjoyment of food,and it significantly impacts the grain quality of cereals,thereby influencing the value and consumption of agricultural products.For example,aromatic rice varieties like Basmati and Jasmine are renowned for their distinct aroma and command almost double the price of regular rice in the market.

关键词： cereal corn thereby