检索结果-南通市图书馆

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

引用

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 intensity.However,an increase in the concentration of SWCNTs would inevitably increase their reabsorption effect,degrading their luminescence efficiency.Herein,we systematically investigated variations in the photoluminescence(PL)intensity of(6,5)single-chirality SWCNTs while increasing their concentration.The results show that the PL intensity first increased to a maximum and then decreased with increasing concentration.Numerical 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 wavelengths.According 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 diameters.The concentration boundary of Type I SWCNTs was higher than that of Type II SWCNTs,and the concentration boundaries of both Types increased with increasing diameter.These 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Graphene aerogel-based vibration sensor with high sensitivity and wide frequency response range

引用

Nano Research 2023年第8期16卷 11342-11349页

作者： Zibo Wang Zhuojian Xiao Jie Mei Yanchun Wang Xiao Zhang Xiaojun Wei Huaping Liu sishen xie Weiya Zhou Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences and College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China

Compared with piezoresistive sensors,pressure sensors based on the contact resistance effect are proven to have higher sensitivity and the ability to detect ultra-low pressure,thus attracting extensive research interest in wearable devices and artificial intelligence systems.However,most studies focus on static or low-frequency pressure detection,and there are few reports on high-frequency dynamic pressure detection.Limited by the viscoelasticity of polymers(necessary materials for traditional vibration sensors),the development of vibration sensors with high frequency response remains a great challenge.Here,we report a graphene aerogel-based vibration sensor with higher sensitivity and wider frequency response range(2 Hz–10 kHz)than both conventional piezoresistive and similar sensors.By modulating the microscopic morphology and mechanical properties,the super-elastic graphene aerogels suitable for vibration sensing have been prepared successfully.Meanwhile,the mechanism of the effect of density on the vibration sensor’s sensitivity is studied in detail.On this basis,the sensitivity,signal fidelity and signal-to-noise ratio of the sensor are further improved by optimizing the structure configuration.The developed sensor exhibits remarkable repeatability,excellent stability,high resolution(0.0039 g)and good linearity(non-linearity error<0.8%)without hysteresis.As demos,the sensor can not only monitor low-frequency physiological signals and motion of the human body,but also respond to the high-frequency vibrations of rotating machines.In addition,the sensor can also detect static pressure.We expect the vibration sensor to meet a wider range of functional needs in wearable devices,smart robots,and industrial equipment.

关键词： vibration sensor graphene aerogel high frequency vibration dynamic pressure detection mechanical property

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interfacial polaron in quantum dots and luminescent porous silicon

引用

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.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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 transistors.The Cu interconnect material used in current integrated circuits seems not applicable for the novel interconnects,as it requires electrochemical deposition followed by chemical-mechanical polishing.We 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 interconnects.The 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 density.However,they show a resistivity around 210 μΩ·cm,which is 20 times of the bulk value and leaving room for improvement.Compared 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 oxidation.For 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced composite thermal conductivity by percolated networks of in-situ confined-grown carbon nanotubes

引用

Nano Research 2023年第11期16卷 12821-12829页

作者： Xiao Zhang Wei Tan Tian Carey Bo Wen Delong He Adrees Arbab Alex Groombridge Fiona Smail Jean de La Verpilliere Chengning Yao Yanchun Wang Xiaojun Wei Huaping Liu sishen xie Felice Torrisi Michael De Volder Weiya Zhou Adam Boies Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Engineering University of CambridgeCambridge CB21PZUK Cambridge Graphene Centre Engineering DepartmentUniversity of CambridgeCambridge CB30FAUK UniversitéParis-Saclay Centrale-SupélecENS Paris-SaclayCNRSLMPS-Laboratoire de Mécanique Paris-Saclay91190Gif-sur-YvetteFrance Echion Technologies Cambridge CB223FGUK Molecular Sciences Research Hub Imperial College LondonLondon W120BZUK Dipartimento di Fisica e Astronomia Universita'di CataniaCatania 6495123Italy School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK School of Physics CRANN&AMBER Research CentresTrinity College DublinDublin D02 E8C0Ireland Jaguar Land Rover Banbury Road GaydonLighthorne HeathWarwick CV350RRUK

Despite the ever-increasing demand of nanofillers for thermal enhancement of polymer composites with higher thermal conductivity and irregular geometry,nanomaterials like carbon nanotubes(CNTs)have been constrained by the nonuniform dispersion and difficulty in constructing effective three-dimensional(3D)conduction network with low loading and desired isotropic or anisotropic(specific preferred heat conduction)performances.Herein,we illustrated the in-situ construction of CNT based 3D heat conduction networks with different directional performances.First,to in-situ construct an isotropic percolated conduction network,with spherical cores as support materials,we developed a confined-growth technique for CNT-core sea urchin(CNTSU)materials.With 21.0 wt.%CNTSU loading,the thermal conductivity of composites reached 1.43±0.13 W/(m·K).Secondly,with aligned hexagonal boron nitride(hBN)as an anisotropic support,we constructed CNT-hBN aligned networks by in-situ CNT growth,which improved the utilization efficiency of high density hBN and reduced the thermal interface resistance between matrix and fillers.With~8.5 wt.%loading,the composites possess thermal conductivity up to 0.86±0.14 W/(m·K),374%of that for neat matrix.Due to the uniformity of CNTs in hBN network,the synergistic thermal enhancement from one-dimensional(1D)+two-dimensional(2D)hybrid materials becomes more distinct.Based on the detailed experimental evidence,the importance of purposeful production of a uniformly interconnected heat conduction 3D network with desired directional performance can be observed,particularly compared with the traditional direct-mixing method.This study opens new possibilities for the preparation of high-power-density electronics packaging and interfacial materials when both directional thermal performance and complex composite geometry are simultaneously required.

关键词： carbon nanotubes hexagonal boron nitride thermal conductivity composites three-dimensional printing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Composite cathode and anode films for rechargeable lithium batteries

引用

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.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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)species.By contrast,a similar decrease in the PL intensity of(6,5)SWCNTs was also observed after mixing with the larger-diameter(9,4)species.Different 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)SWCNTs.Both 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 intensity.Meanwhile,the influence of EET was found to be always weaker than that of photon absorption and reabsorption.We 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Highly stretchable pseudocapacitors based on buckled reticulate hybrid electrodes

引用

Nano Research 2014年第11期7卷 1680-1690页

作者： Nan Zhang Pingshan Luan Weiya Zhou Qiang Zhang Le Cai Xiao Zhang Wenbin Zhou Qingxia Fan Feng Yang Duan Zhao YanchunWang sishen xie Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

以便与高特定的电容和突出的 stretchability 开发优秀 pseudocapacitor 与在便携的未来和 bio-implantable 系统适用的另外的设备匹配，我们在三个重要方面上集中我们的研究：混合电影电极，在不同部件之间的接口，和在基于围单人赛的... 详细信息

以便与高特定的电容和突出的 stretchability 开发优秀 pseudocapacitor 与在便携的未来和 bio-implantable 系统适用的另外的设备匹配，我们在三个重要方面上集中我们的研究：混合电影电极，在不同部件之间的接口，和在基于围单人赛的碳 nanotube/polyaniline (SWCNT/PANI ) 的 supercapacitors 的 stretchability 和电气化学的综合性能的 Stretchability 预先伸长的弹性体上的合成电影。由于中等的孔，弄弯的混合电影避免裂开它发生在常规可拉长的混合电极，和两个 435 F

关键词：赝电容器复合电极单壁碳纳米管可伸缩电化学超级电容器电极性能网状电解质渗透率

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optical visualization and polarized light absorption of the single-wall carbon nanotube to verify intrinsic thermal applications

引用

Light(Science & Applications) 2015年第1期4卷 251-258页

作者： Xiao Zhang Li Song Le Cai Xuezeng Tian Qiang Zhang Xiaoying Qi Wenbin Zhou Nan Zhang Feng Yang Qingxia Fan Yanchun Wang Huaping Liu Xuedong Bai Weiya Zhou sishen xie Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China National Center for Nanoscience and Technology Beijing 100190China

The predicted extraordinary properties of carbon nanotubes(CNTs)from theoretical calculations have great potential for many applications.However,reliable experimental determination of intrinsic properties at the single-tube level is currently a matter of concern,and many challenges remain because of the unhandled and nanoscale size of individual nanotubes.Here,we demonstrated a prototype to detect the intrinsic thermal conductivity of the single-wall carbon nanotube(SWCNT)and verify the significant non-resonant optical absorption behavior on tiny nanotubes by integrating the nanotube and ice into a new core-shell design.In particular,a reversible optical visualization method based on the individual suspended ultra-long SWCNT was first developed by wrapping a nanotube with ice in the cryogenic air environment.The light-induced thermal effect on the hybrid core-shell structure was used tomelt the ice shell,which subsequently acted as a temperature sensor to verify the intrinsic thermal conductivity of the core-like nanotube.More interestingly,we successfully determined for the first time the thermal response phenomenon of the tiny absorption cross section in SWCNT in the vertical-polarization configuration and the significant non-resonant absorption behavior in the parallel-polarization configuration.These investigations will provide a better understanding for the unique optical behaviors of CNT and enable the detection of intrinsic properties of various one-dimensional nanostructures such as nanotubes,nanowires,and nanoribbons.

关键词： carbon nanotube optical visualization polarized laser resonant absorption

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Editorial

引用

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 Institute of Physics Chinese Acedemy of Sciences Beijing China

Nanoscience and nanotechnology have a history of nearly a decade-long intensive development.Since National Nanotechnology initiation of USA (in the year 2000),many important progresses have been

关键词： Editorial

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：