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Different effects of substrates on the morphologies of single-walled carbon nanotubes

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Chinese Science Bulletin 2014年第19期59卷 2318-2323页

作者： Li Tao Gang Wang Fang Yu lianfeng sun National Center for Nanoscience and Technology University of Chinese Academy of Sciences

In this work,different effects of substrates on the morphologies of single-walled carbon nanotubes(SWNTs)are *** were produced by floating catalytic chemical vapor deposition using CH4as carbon source gas and Ar as carrier *** the SWNTs were deposited on lithography-patterned different *** as-grown SWNTs at the boundaries between SiO2and metal were characterized by scanning electron microscopy,atomic force spectroscopy and Raman *** is found that SWNTs deposited on low-conductivity substrates trend to have curved morphologies and some of them form rings,while SWNTs deposited on metal substrates remain straight and *** mechanism of these effects was also discussed,which is closely related to the thermal conductivities and the principle of energy dissipation.

关键词：单壁碳纳米管催化化学气相沉积形态基板扫描电子显微镜拉曼光谱能量耗散图案化

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喹硫平联合丁螺环酮治疗精神分裂症的效果

临床医学工程 2024年第5期31卷 539-540页

作者：胡广旭赵云东孙连风驻马店市精神病院精神五科河南省驻马店463002

目的分析喹硫平联合丁螺环酮治疗精神分裂症(SCH)患者的效果。方法选取2020年4月至2023年3月本院收治的100例SCH患者,按照奇偶顺序分为观察组与对照组。对照组采用喹硫平治疗,观察组采用喹硫平联合丁螺环酮治疗。比较两组患者症状评分... 详细信息

目的分析喹硫平联合丁螺环酮治疗精神分裂症(SCH)患者的效果。方法选取2020年4月至2023年3月本院收治的100例SCH患者,按照奇偶顺序分为观察组与对照组。对照组采用喹硫平治疗,观察组采用喹硫平联合丁螺环酮治疗。比较两组患者症状评分、血清指标水平及生活质量。结果治疗后,观察组PANSS评分低于对照组(P<0.05)。治疗后,观察组胶质源性神经营养因子(GDNF)、脑源性神经营养因子(BDNF)、5-羟色胺(5-HT)水平高于对照组(P<0.05)。治疗后,观察组GQOLI-74评分高于对照组(P<0.05)。结论喹喹硫平联合丁螺环酮治疗SCH可减轻患者的临床症状,调节神经递质水平,改善其生活质量。

关键词：喹硫平丁螺环酮精神分裂症

齐拉西酮联合右佐匹克隆治疗精神分裂症伴睡眠障碍的效果

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临床医学工程 2024年第1期31卷 39-40页

作者：胡广旭赵云东孙连风驻马店市精神病院精神五科河南驻马店463002

目的探讨齐拉西酮联合右佐匹克隆治疗精神分裂症(SCH)伴睡眠障碍的效果。方法选取2020年5月至2023年4月本院收治的100例SCH伴睡眠障碍患者,按照抽签法分为观察组与对照组。对照组采用齐拉西酮治疗,观察组采用齐拉西酮联合右佐匹克隆治... 详细信息

目的探讨齐拉西酮联合右佐匹克隆治疗精神分裂症(SCH)伴睡眠障碍的效果。方法选取2020年5月至2023年4月本院收治的100例SCH伴睡眠障碍患者,按照抽签法分为观察组与对照组。对照组采用齐拉西酮治疗,观察组采用齐拉西酮联合右佐匹克隆治疗。比较两组睡眠质量及精神状态。结果治疗后,观察组匹兹堡睡眠质量指数(PSQI)、阳性及阴性症状量表(PANSS)各维度评分均低于对照组(P<0.05)。治疗后,观察组睡眠潜伏期、觉醒时间短于对照组,NREM时间长于对照组(P<0.05)。结论齐拉西酮联合右佐匹克隆治疗SCH伴睡眠障碍患者可改善其睡眠质量及精神状态,延长睡眠时间。

关键词：齐拉西酮右佐匹克隆精神分裂症睡眠障碍

Studies on the properties of surface and edges of N-layer graphenes

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1729-1738页

作者： CHEN MinJiang ZHOU HaiQing QIU CaiYu YANG HuaiChao YU Fang sun lianfeng National Center for Nanoscience and Technology Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tsinghua University Beijing 100084 China peking University Beijing 100871 China

Graphene, a new two-dimensional carbon material, is a rising star of physics, chemistry and materials science. In this work, we report the recent experimental researches on the Raman spectra and the temperature-dependent features of graphenes and car- bon nanoscrolls, which are evolved from graphene and have an open tubular structure. The layer-dependent Raman enhancing characteristics of n-layer graphenes for crystal violet, and the thickness-dependent morphologies of gold on n-layer graphenes are also systematically investigated. Meanwhile, the aggregations of ferromagnetic and paramagnetic atoms at edges of gra- phenes and graphite are observed and the mechanisms are discussed.

关键词： N-layer graphene Raman spectroscopy edge ferromagnetism

Synthesis and characterization of oriented linked LiFePO4 nanoparticles with fast electron and ion transport for high-power lithium-ion batteries

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Nano Research 2015年第12期8卷 3803-3814页

作者： Yi Jiang Ruiyuan Tian Haiqiang Liu Jiankun Chen Xinghua Tan Lina Zhang Guangyao Liu Hanfu Wang lianfeng sun Weiguo Chu National Center for Nanoscience and Technology of China Beijing 100190 China DepartmentofPhysics Tsinghua University Beijing 100084 China China University ofGeosciences Beijing 100083 China

LiFePO4 nanoparticles with different morphologies and sizes were synthesized via a solvothermal method using environmentally benign and low-cost glycerol as the surfactant. The morphology, size, and structure of the particles were found to relate closely to the concentration of glycerol. Oriented linked LiFePO4 nanorods along mostly non-[010] were obtained with the proper concentration of glycerol. The nanorods showed good electronic and ionic conductivities, resulting in superior rate capability and cycling performance. This performance was attributed to the oriented linkages along mostly non-[010], the small particle size along [010], and the occupation of Li at Fe sites. Initial discharge capacities of 162.4 mA.h.g-1 at 0.1 C and 102.1 mA.h.g-1 at 30 C were achieved, with capacity retentions after 500 cycles at 5 and 20 C of 99.5% and 93.2%, respectively. At the rate of 40 C, the solid-solution phase transition dominated during lithiation and delithiation of all samples.

关键词： LiFePO4 oriented link high power site occupation

基于多波束三维扫测的长江大桥水下基础检测技术

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广东水利水电 2024年第9期 80-84,107页

作者：雷红博邱忠南孙连峰伍贤智吕宏奎桥梁智能与绿色建造全国重点实验室武汉430034 中铁大桥科学研究院有限公司武汉430034

该文依托某长江大桥水下基础检测项目,采用基于多波束三维扫测的水下基础检测方法对桥梁水下基础开展全面检测:采用多波束测深声呐进行河床三维地形扫测;采用多波束三维图像声呐进行桥墩局部冲刷检测;采用双频图像声呐进行桥墩水下外观... 详细信息

该文依托某长江大桥水下基础检测项目,采用基于多波束三维扫测的水下基础检测方法对桥梁水下基础开展全面检测:采用多波束测深声呐进行河床三维地形扫测;采用多波束三维图像声呐进行桥墩局部冲刷检测;采用双频图像声呐进行桥墩水下外观检测。结果表明:桥址附近河床高程在5.03~-14.50 m之间;长江大桥4^(#)墩-6^(#)墩之间的河床冲刷明显,冲刷最严重区域高程在-14 m左右;5^(#)墩水下基础相较于设计值冲刷深度为2.32 m;长江大桥桥墩基础存在局部变形、局部缺损等情况;经验证,以上与常规方法检测结果一致。文章采用的检测方法可以获得高精度的三维河床地形图,并精确掌握桥墩局部冲刷及外观病害,为桥梁水下基础的养护及维修工作提供数据支撑,可为其他相关工程实践提供参考。

关键词：桥梁工程水下基础检测多波束声呐多波束三维扫测检测技术

Ferromagnetism in sp^(2) carbon

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Nano Research 2023年第12期16卷 12883-12900页

作者： Wenxiang Wang Julienne Impundu Jiyou Jin Zhisheng Peng Hui Liu Zheng Wei Yushi Xu Yu Wang Jiawang You Weimin Fan Yong Jun Li lianfeng sun CAS Key Laboratory of Nanosystem and Hierarchical Fabrication Nanofabrication laboratoryCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China The GBA National Institute for Nanotechnology Innovation Guangzhou 510700China

The bulk,pristine sp^(2) carbons,such as graphite,carbon nanotubes,and graphene,are usually assumed to be typical diamagnetic ***,over the past two decades,there have been many reports about the ferromagnetism in these sp^(2) carbon materials,which have attracted intense interest for basic research and potential *** this review,we focus on the evidence and developments of the emergent ferromagnetism in sp^(2) carbon revealed by nine kinds of experimental methods:magnetic force microscopy(MFM),magnetization measurements with physical property measurement system(PPMS),X-ray magnetic circular dichroism(XMCD),scanning tunneling microscopy(STM),miniaturized magnetic particle inspection(MPI),anomalous Hall effect(AHE),mechanical deflection of carbon nanotube cantilevers,magnetoresistance,and spin-related devices(spin field effect transistor and spin memory).The advantages,conclusions,challenges,and future of these methods are *** ferromagnetism in sp^(2) carbon will open a door to explore exotic physical phenomena and lay the basis for the development of integrated circuit of spintronics,which is fundamentally different from charge-based conventional electronics.

关键词： ferromagnetism sp^(2)carbon anomalous Hall effect spin devices magnetoresistance

Observation of Van Hove Singularities and Temperature Dependence of Electrical Characteristics in Suspended Carbon Nanotube Schottky Barrier Transistors

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Nano-Micro Letters 2018年第2期10卷 75-80页

作者： Jian Zhang Siyu Liu Jean Pierre Nshimiyimana Ya Deng Xiao Hu Xiannian Chi Pei Wu Jia Liu Weiguo Chu lianfeng sun CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology University of Chinese Academy of Sciences

A Van Hove singularity(VHS) is a singularity in the phonon or electronic density of states of a crystalline solid. When the Fermi energy is close to the VHS, instabilities will occur, which can give rise to new phases of matter with desirable properties. However, the position of the VHS in the band structure cannot be changed in most materials. In this work, we demonstrate that the carrier densities required to approach the VHS are reached by gating in a suspended carbon nanotube Schottky barrier transistor. Critical saddle points were observed in regions of both positive and negative gate voltage, and the conductance flattened out when the gate voltage exceeded the critical value. These novel physical phenomena were evident when the temperature is below 100 K. Further, the temperature dependence of the electrical characteristics was also investigated in this type of Schottky barrier transistor.

关键词： Carbon nanotube Van Hove singularities Schottky barrier transistors

Thickness-dependent morphologies of Ag on n-layer MoS2 and its surface-enhanced Raman scattering

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Nano Research 2016年第6期9卷 1682-1688页

作者： Ya Deng Minjiang Chen Jian Zhang Zihao Wang Wenbin Huang Yun Zhao Jean PierreNshimiyimana Xiao Hu Xiannian Chi Gu Hou ,Xueyao Zhang Yanjun Guo lianfeng sun CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology 8eijing 100190 China School of Physics Shandong University Jinan 250100 China Chinese Academy of Sciences Beijing 100049 China

The size and density of Ag nanoparticles on n-layer MoS2 exhibit thickness- dependent behavior. The size and density of these particles increased and decreased, respectively, with increasing layer number （n） of n-layer MoS2. Furthermore, the surface-enhanced Raman scattering （SERS） of Ag on this substrate was observed. The enhancement factor of this scattering varied with the thickness of MoS2. The mechanisms governing the aforementioned thickness dependences are proposed and discussed.

关键词： MoS2 nanoparticle thickness-dependent surface-enhanced Ramanscattering (SERS)