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Science China(Physics,Mechanics & Astronomy) 2009年第1期52卷 2-3页

作者： xie sishen Institute of Physics Chinese Acedemy of Sciences

The Cretaceous granitoids in the middle and northern Gangdese, Tibet are generally interpreted as the products of anatexis of thickened deep crust genetically associated with the Lhasa-Qiangtang collision. This paper reports bulk-rock major element, trace element and Sr-Nd isotopic data, zircon U-Pb age data, and zircon Hf isotopic data on the Zayu pluton in eastern Gangdese, Tibet. These data shed new light on the petrogenesis of the pluton. Our SHRIMP zircon U-Pb age dates, along with LA-ICPMS zircon U-Pb age dates recently reported in the literature, indicate that the Zayu pluton was emplaced at about 130 Ma, coeval with Early Cretaceous magmatic rocks in other areas of eastern Gangdese (e.g., Rawu, Baxoi areas) and the Middle Gangdese. The Zayu pluton samples lack amphibole and muscovite, and are compositionally characterized by high SiO2 (69.9%―76.8%), K2O (4.4%―5.7%), and low P2O5 (0.05%―0.12%). These samples also have A/CNK values of 1.00-1.05, and are enriched in Rb, Th, U, and Pb, and depleted in Ba, Nb, Ta, Sr, P, Ti, and Eu. These geochemical features suggest that the Zayu pluton samples are metaluminous to slightly peraluminous and are of highly fractionated I-type granite. The Zayu pluton samples have high εNd(t) values (-10.9--7.6) and low initial 87Sr/86Sr ratios (0.7120- 0.7179) relative to melts derived from mature continental crust in the Gangdese (e.g., Ningzhong Early Jurassic strongly peraluminous granite). The Zayu pluton samples are heterogeneous in zircon εHf(t) values (-12.8--2.9), yielding ancient zircon Hf crustal model ages of 1.4―2.0 Ga. The data obtained in this study together with the data in the recent literature suggest that the Early Cretaceous granitoids in eastern Gangdese represent the eastward extension of the Early Cretaceous magmatism in the middle Gangdese, and that the Lhasa micro-continent block with ancient basement may extend for ~2000 km from east to west. Zircon Hf isotopic data and bulk-rock zircon saturation temperatu

关键词： zircon U-Pb dating Sr-Nd-Hf isotope highly fractionated I-type granite Zayu pluton eastern Gangdese Tibet

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Interfacial polaron in quantum dots and luminescent porous silicon

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Chinese Science Bulletin 2001年第8期46卷 630-635页

作者： Bingsuo Zou sishen xie Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

Polaronic effect is important in the current researches on quantum dots (QD). This paper reported a new concept of the 'confined polaron', their size dependent formation possibilities and energy variation in different QD systems, with an indication of contribution from both intrinsic and/or extrinsic phonons. To understand the spectro-scopic characteristics of porous silicon (PS), we find that luminescence behavior of oxidized porous silicon is in good agreement with the model of interfacial confined polaron in QDs. This conclusion is useful to unveiling the mechanmism of PS luminescence.

关键词： porous silicon luminescence interfacial polaron quan- tum dots.

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Current sustainability and electromigration of Pd,Sc and Y thin-films as potential interconnects

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Nano-Micro Letters 2010年第3期2卷 184-189页

作者： Yong Yang Shengyong Xu sishen xie Lian-Mao Peng Key Laboratory for the Physics and Chemistry of Nanodevices and Department of ElectronicsPeking University Institute of Physics Chinese Academy of Sciences

The progress on novel interconnects for carbon nanotube(CNT)-based electronic circuit is by far behind the remarkable development of CNT-field effect *** Cu interconnect material used in current integrated circuits seems not applicable for the novel interconnects,as it requires electrochemical deposition followed by chemical-mechanical *** report our experimental results on the failure current density,resistivity,electromigration effect and failure mechanism of patterned stripes of Pd,Sc and Y thin-films,regarding them as the potential novel *** Pd stripes have a failure current density of(8~10)×106 A/cm^2(MA/cm^2),and they are stable when the working current density is as much as 90% of the failure current ***,they show a resistivity around 210 μΩ·cm,which is 20 times of the bulk value and leaving room for *** to Pd,the Sc stripes have a similar resistivity but smaller failure current density of 4~5 MA/cm^2.Y stripes seem not suitable for interconnects by showing even lower failure current density than that of Sc and evidence of *** comparison,Au stripes of the same dimensions show a failure current density of 30 MA/cm^2 and a resistivity around 4 μΩ·cm,making them also a good material as novel interconnects.

关键词： Carbon nanotube-based field effect transistors Carbon nanotube-based circuit Interconnects Current density Electromigration Resistivity

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Enhancing electrochemical capacity and interfacial stability of lithium-ion batteries through side reaction modulation with ultrathin carbon nanotube film and optimized lithium cobalt oxide particle size

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Nano Research 2024年第8期17卷 7230-7241页

作者： Wei Xi Xiaogang Xia Jiacheng Zhu Dehua Yang sishen xie Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and ***,its application has been limited by relatively low capacity and stability at high *** particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate ***,side reactions are simultaneously enhanced as the specific surface area ***,we investigate the impact of LCO particles with varying size distributions and optimize the particle *** modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UCNF)is introduced to coat the cathode *** this simple process and optimized particle size,the rate performance improves significantly,normal commercial LCO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 C(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 C(0.99 mA·h·cm^(−2))was achieved with high-voltage LCO(HVLCO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 *** the first time,UCNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LCO and electrolyte *** findings provide a simple method for improving LCO rate performance,especially at high C-rates.

关键词： lithium-ion batteries lithium cobalt oxides carbon nanomaterials side reactions

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Chirality-dependent concentration boundaries of single-wall carbon nanotubes for photoluminescence characterization and applications

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Nano Research 2023年第2期16卷 1820-1825页

作者： Shilong Li Linhai Li Xiaojun Wei Weiya Zhou sishen xie Huaping Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physical Science and Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Increasing the concentration of single-wall carbon nanotubes(SWCNTs)is an effective method for enhancing their luminescence ***,an increase in the concentration of SWCNTs would inevitably increase their reabsorption effect,degrading their luminescence ***,we systematically investigated variations in the photoluminescence(PL)intensity of(6,5)single-chirality SWCNTs while increasing their *** results show that the PL intensity first increased to a maximum and then decreased with increasing *** analysis indicates that the concentration boundary corresponding to the maximum PL intensity was strongly dependent on the ratio of the optical absorbances of the SWCNTs at their excitation and emission *** to this,statistical analysis by experimentally measuring the optical absorption spectra of 18 kinds of single-chirality SWCNTs shows that the concentration boundaries of SWCNTs were dependent upon their Types and *** concentration boundary of Type I SWCNTs was higher than that of Type II SWCNTs,and the concentration boundaries of both Types increased with increasing *** results provide important guidance for spectral characterization and applications in bioimaging and photoelectronic devices.

关键词： single-wall carbon nanotube photoluminescence concentration boundary reabsorption

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ZnO nanorods:morphology control, optical properties, and nanodevice applications

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2243-2265页

作者： ZHOU WeiYa ZHANG XiaoXian ZHAO Duan GAO Min xie sishen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

Research interest in ZnO nanostructures derives from their excellent luminescent properties and availability of low cost fabricating and processing,which hold promise for the development of electronic and optoelectronic *** this review,we focus on the progress in synthesis,properties and nanodevices of ZnO nanorod(NR)arrays and nanotetrapods(NTPs).Recent work done by the authors are also *** a brief introduction to the controlled fabrication methods for the highly-ordered ZnO NR arrays and NTPs,we present some aspects of the fundamental properties,especially optical performance,of ZnO NRs/***,we provide an overview of the applications to functional nanodevices based on individual NR and NTP of *** is demonstrated that different morphologies of ZnO nanostructures have salient effects on their properties and *** much progress has been achieved in the fundamental and applied investigations of ZnO NRs/NTPs over the past decade,many obstacles still remain,hampering further development in this ***,some longstanding problems that warrant further investigation are addressed.

关键词： ZnO nanostructures controlled growth optical property nanodevices

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Freestanding single-walled carbon nanotube bundle networks:Fabrication,properties and composites

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Chinese Science Bulletin 2012年第2期57卷 205-224页

作者： ZHOU WeiYa MA WenJun NIU ZhiQiang SONG Li xie sishen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

As a type of thin film,two dimensional(2D) reticulate architectures built of freestanding single-walled carbon nanotube(SWCNT) bundles are suitable for scalable integration into devices and nanocomposites for many *** superior properties of these films,such as optical transparency,unique electrical properties and mechanical flexibility,result not only from the outstanding properties of individual SWCNTs but also from the collective behavior of the individual tubes,with additional properties arising from the tube-tube *** this review,the synthesis,structure and fundamental properties,such as conductivity,transparency,optical nonlinearity and mechanical performance,of "freestanding SWCNT bundle network" thin films and nanocomposites,as well as their application as supercapacitors are *** long-standing problems and topics warranting further investigation in the near future are addressed.

关键词：单壁碳纳米管束纳米复合材料电气性能网络光学透明性制备机械性能非线性光学

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Photoluminescence of C_(60) Single Crystals

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Chinese Physics Letters 1995年第5期12卷 317-320页

作者： LI Chaorong WANG Gang ZHANG Jiaming MAI Zhenhong ZHAO Tienan XU Lu xie sishen Institute of Physics Academia SinicaBeijing 100080 Shanghai Institute of Technical Physics Academia SinicaShanghai 200083

The photoluminescence(PL)spectra of C_(60) single crystals grown under double temperature gradient(DTG)and single temperature gradient(STG)techniques were investigated at room *** results show that the PL emission intensity increases first and then decreases with increasing illuminated power density for the C_(60) single crystals grown by both DTG and STG ***,one main peak with a shoulder peak can be clearly distinguished at low illumination,while only one main peak without the shoulder peak can be seen at high *** main peak undergoes a continuous blue shift and broadening with the increase of illuminated power *** difference of PL emission energy at the same illumination density of DTG and STG samples may correlated with the degree of both the orientational disorder of C_(60) molecule and lattice *** Laue diffraction patterns show that the DTG sample has stronger strains and poorer crystalline quality than the STG sample.

关键词： temperature. density. illumination

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Composite cathode and anode films for rechargeable lithium batteries

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Chinese Science Bulletin 1998年第2期43卷 129-132页

作者： Dihua Guan Li Jiang Wei Zhou Guoquan Yang Gang Wang sishen xie Beijing Univ Sci & Technol Dept Chem Beijing 100083 Peoples R China Chinese Acad Sci Ecoenvironm Sci Res Ctr Beijing 100085 Peoples R China Cent Univ Nationalities Dept Phys Beijing 100081 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

Recently the rechargeable Li and Li_ion polymer batteries have improved due to development of Li_ion conductive gel electrolytes and of high energe granting intercalation compounds. In our laboratory the composite cathodic film, the composite carbon anode film and PVC_based electralyte film were successfully prepared by casting procedures. Cycling experiments of the cells with Li or composite carbon anode in contact with PVC_based electrolyte and composite cathode were performed. Relatively good performance of the cell with Li anode, the composite cathode and LiPF-6_EC_DEC electrolyte was achieved in that over 50 cycles were possible with minimal capacity loss upon cycling. The same cell with PVC_based electrolyte was cycled over 20 cycles. Replacing Li anode by composite carbon anode, the cell behaved like the latter. It is found that appropriate amount of carbon content is helpful to improving specific capacity.

关键词： composite films gel electrolyte film poly(vinyl chloride) casting 3_film configuration batteries.

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Quantitative analysis of the intertube coupling effect on the photoluminescence characteristics of distinct(n,m)carbon nanotubes dispersed in solution

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Nano Research 2020年第4期13卷 1149-1155页

作者： Shilong Li Dehua Yang Jiaming Cui Yanchun Wang Xiaojun Wei Weiya Zhou Hiromichi Kataura sishen xie Huaping Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering College of Materials Science and Opto-Electronic TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China Department of Physical Science University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8565Japan

In this work,we quantitatively studied the intertube coupling of different(n,m)-sorted semiconducting single-wall carbon nanotubes(SWCNTs)on their photoluminescence(PL)efficiencies by precisely tuning the ratio of(9,4)and(6,5)SWCNTs in the mixture.A significant decrease in the PL intensity of(9,4)SWCNTs was observed after mixing with(6,5)species when fixing the(9,4)concentration,which was confirmed to be caused by the absorption of incident photons and reabsorption of the emitted photons by the added(6,5)*** contrast,a similar decrease in the PL intensity of(6,5)SWCNTs was also observed after mixing with the larger-diameter(9,4)*** from that of(9,4)SWCNTs,the PL decrease of(6,5)SWCNTs was found to originate not only from photon absorption and reabsorption by the(9,4)species but also from one-way exciton energy transfer(EET)from the(6,5)SWCNTs to the larger-diameter(9,4)*** the experimental results and numerical simulations further demonstrated that increasing the concentration of mixed(9,4)SWCNTs would enhance the effects of photon absorption and reabsorption and EET on the PL intensity of(6,5)SWCNTs quantified by the decrease ratio of the(6,5)PL ***,the influence of EET was found to be always weaker than that of photon absorption and *** proposed that the observed EET between isolated SWCNTs in a surfactant solution is derived from their proximity due to Brownian motion.

关键词： single-wall carbon nanotubes photoluminescence intertube coupling quantitative analysis

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