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Flexible printed three dimensional(3D) integrated carbon nanotube complementary metal oxide semiconductor(CMOS) thin film transistors and circuits

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Science China(Information Sciences) 2024年第9期67卷 280-293页

作者： zhaofeng chen Jiaqi LI Min LI Hongxuan GUO Jianwen ZHAO SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Southeast University Printable Electronics Research Center Division of Nanodevices and Related NanomaterialsSuzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences School of Nano Technology and Nano Bionics University of Science and Technology of China

The threshold voltage modulation of carbon nanotube thin-film transistors（TFTs） and flexible three-dimensional（3D） integration circuits has become hot research topics for carbon-based electronics. In this paper, a doping-free gate electrode technology is introduced to significantly modulate the threshold voltage of polymer-sorted semiconducting single-walled carbon nanotube（sc-SWCNT） TFTs in combination with the highly effective gate-controlling ability of solid-state electrolyte thin films as the dielectrics. A systematic investigation was conducted on the impact of printed silver, evaporated silver, and evaporated aluminum（Al） gate electrodes on the threshold voltage of flexible printed bottom-gate and top-gate SWCNT TFTs. The results indicate that the SWCNT TFTs with Al gate electrodes exhibit enhancement-mode characteristics with excellent electrical properties, such as the negative threshold voltages（-0.6 V）, high Ion/Ioff（up to 10～6）, low subthreshold swing(61.4 mV · dec-1), and small hysteresis. It is attributed to either the formation of lower work function thin films（Al2O3） at the electrode/dielectric layer interfaces through the natural oxidation of the Al bottom-gate electrodes or the dipole reaction of the Al top-gate electrodes from X-ray photoelectron spectroscopy（XPS） and ultraviolet photoelectron spectroscopy（UPS） data. In addition, 3D complementary metal-oxide-semiconductor（CMOS） inverters with common gate electrodes were constructed using the resulting enhancement-mode P-type SWCNT TFTs and matched N-type SWCNT TFTs, which shows high voltage gain（34）, rail-to-rail output and high noise margins(80.04%, VDD=-1 V)as well good mechanical flexibility at low operation voltages. It demonstrates that SWCNT TFTs have great advantages for building large-scale 3D flexible integrated circuits.

关键词： three-dimensional CMOS circuits printing technology polymer-sorted semiconducting carbon nanotubes enhancement-mode thin-filmtransistors threshold voltage modulation

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Top priority current path between SiC particles during ultra-high temperature flash sintering: Presence of PyC “bridges”

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Journal of Advanced Ceramics 2024年第2期13卷 255-262页

作者： Le Lu Tianlong Liu zhaofeng chen Fei Wang Mengmeng Yang Qiong Wu Lixia Yang Huanyong Li International Laboratory for Insulation and Energy Efficiency Materials College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 211106China State Key Laboratory of Solidification Processing School of Materials and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Flash sintering(FS)is a novel technique for rapidly densifying silicon carbide(SiC)*** work achieved a rapid sintering of SiC ceramics by the utilization of ultra-high temperature flash sintering within 60 *** carbon(PyC)“bridges”were constructed between SiC particles through the carbonisation of phenolic resin,providing a large number of current *** incubation time of the flash sintering process was significantly reduced,and the sintering difference between the centre and the edge regions of the ceramics was minimized,with an average particle size of the centre region and edge region being 12.31 and 9.02μm,*** results showed that the porosity of the SiC ceramics after the flash sintering was reduced to 14.79% with PyC“bridges”introduced,and the Vickers hardness reached 19.62 ***“bridges”gradually evolved from amorphous eddy current carbon to oriented graphite carbon,indicating that the ultra-high temperature environment in which the sample was located during the flash sintering was successfully ***-high temperature flash sintering of SiC is expected to be applied to the local repair of matrix damage in SiC ceramic matrix composites.

关键词： silicon carbide(SiC) flash sintering(FS) pyrolytic carbon(PyC)"bridges" current path instantaneous

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A lightweight and high compressive resistance thermal insulation material with dual-network structure

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Nano Research 2024年第5期17卷 4279-4287页

作者： Mengmeng Yang zhaofeng chen Yang Ding Wu Qiong Tianlong Liu Manna Li Lixia Yang Sheng Cui School of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 211816China

Ceramic fibrous aerogels are highly desirable for thermal management materials due to their high porosity,excellent elasticity,thermal conductivity,and good thermal ***,the fabrication of nanofibrous aerogel with super-elasticity and good shape retention at the same time has remained *** meet the requirements,a novel anisotropy nanofibrous-granular aerogel with a quasi-layered multi-arch-like and hierarchical-cellular structure is designed and prepared by vacuum-filtration-assisted freeze-drying and *** quasi-layered multi-arch and flexible nanofibers endowed the aerogels with excellent mechanical robustness(ultimate stress up to 60 kPa with strain 60%)and super-elasticity with recoverable compression strain up to 60%.The introduced SiO_(2) aerogel nanoparticles and nanofibers are assembled into an arch-like structure and become the connection point of adjacent nanofibers,which endows low thermal conductivity(0.024 mW/(m·K))of composite *** novel strategy provides a fresh perspective for the preparation of nanofibrous aerogel with robust mechanical in thermal insulation and other fields.

关键词： nanofibrous aerogel dual-network structure thermal insulation nanofibrous-granular composite aerogels strong mechanical

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Growth mechanism of polycrystalline Ir coating by double glow plasma technology

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Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 469-479页

作者： Wangping WU zhaofeng chen College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China

Pure Ir coating was produced by double nism of the Ir coating was investigated. glow plasma technology. Growth mecha- The Ir coating was composed of irregular compacted columnar grains with lots of nanovoids appeared on the interface between the coating and the substrate. The Ir coating was polycrystalline with a preferred （220） orientation due to the initial nuclei with preferred growth on the surface of the substrate. The formation mechanism of the Ir coating depended on kinetic adsorp- tion and diffusion process with nucleation, coalescence and thickness growth. At the beginning of the deposition process, the growth mode of the coating was mainly con- trolled by the nucleation rate. Due to the low substrate temperature resulting in low mobility of the deposited atoms, some micropores and nanoviods were present at the interface. With the deposition process, the substrate temperature was increased and then kept steady. The growth of the coating was governed by the growth rate. The high substrate temperature supported enough energy to surface mobilitv of adatoms.

关键词： Growth mechanism Coating Iridium Double glow plasma

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Oxidation Resistance Coatings of Ir-Zr and Ir by Double Glow Plasma

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Journal of Materials Science & Technology 2014年第3期30卷 268-274页

作者： zhaofeng chen Wangping Wu Xiangna Cong College of Material Science and Technology Nanjing University of Aeronautics and Astronautics

Oxidation resistance coatings of Ir-40 at.% Zr and Ir were produced onto Mo substrates by double glow plasma technology. The oxidation resistances of the coatings were evaluated at high temperature. Ir-Zr coating consisted of two layers： the primary layer close to the substrate was composed of dense columnar grains and the second layer was composed of dense grains of nanometric size. The mass gain of Ir coating above 800℃ was about 1.35% due to the formation of solid IrO2. The mass loss of Ir coating was about 5.3% due to the formation of gaseous oxide IrO3 when being held at 1227 ℃ for 30 min. The substrate was protected more effectively by multilayer than monolayer coating of Ir in oxidizing environment. The Ir-Zr coating was well bonded to the substrate after oxidation at 800℃. After oxidation at 1000℃, the Ir-Zr coating was poorly bonded to the substrate. The oxidation resistance of Ir-Zr coating was poor due to high content of Zr.

关键词： Coating Oxidation resistance Double glow discharge

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省际资本存量及投资效率估算研究

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中国物价 2024年第6期 69-73页

作者：邹晓梅陈兆丰中国宏观经济研究院投资研究所中国社会科学院大学经济学院

本文利用永续盘存法估算了分省区2001-2022年物质资本存量,并在此基础上测算了各省区阶段增量资本产出比(ICOR)变化情况。2000年以来,中西部省份资本存量快速增长,东部和东北地区增长相对较缓。从整体和区域内部来看,ICOR与人均资本存... 详细信息

本文利用永续盘存法估算了分省区2001-2022年物质资本存量,并在此基础上测算了各省区阶段增量资本产出比(ICOR)变化情况。2000年以来,中西部省份资本存量快速增长,东部和东北地区增长相对较缓。从整体和区域内部来看,ICOR与人均资本存量大致呈正相关关系。但是从区域间来看,东部地区投资转化为产出的效率更高,西部地区最低,东部地区更高的全要素生产率有利于减缓资本边际报酬递减规律对投资效率的不利影响。

关键词：固定资本形成资本存量投资效率

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Growth of SiC as Binder to Adhere Diamond Particle and Tribological Properties of Diamond Particles Coated SiC

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Journal of Materials Science & Technology 2015年第11期31卷 1133-1138页

作者： Shengjie Yu zhaofeng chen Yang Wang Shuwei Hu Ruiying Luo Sheng Cui Super Insulation Composite Laboratory College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Center of Materials Physics and Chemistry School of Physics and Nuclear Energy Engineering Beijing University of Aeronautics and Astronautics College of Materials Science and Engineer Nanjing Tech University

The purpose of this work was to grow SiC as binder to adhere diamond particles to graphite substrate by low pressure chemical vapor deposition （LPCVD） at 1100 ℃ and 100 Pa using methyltrichlorosilane （MTS： CH3SiCl3） as precursor. The composite coatings on graphite substrates were analyzed by various techniques. Results show that a dense SiC coating with a cloud-cluster shape was formed both on the diamond particles and the substrate after deposition, The thermal stress （290.6 MPa） strengthened the interfacial bonding between the diamond particle and the SiC coating, which is advantageous for the purpose of adhering diamond particles to graphite substrate. The applied load of sliding wear test was found to affect not only the friction coefficient, but also the wear surface morphology. With increasing loads, the asperity penetration was high and the friction coefficient decreased.

关键词： Diamond particle LPCVD (low pressure chemical vapor deposition) SiC Tribological performance

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肝硬化患者发生急性肾脏病预测模型的建立与验证

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协和医学杂志 2024年第1期15卷 89-98页

作者：欧阳晶常虹杨梦娇张梦田梦郑亚王玉平陈兆峰兰州大学第一临床医学院兰州730000 兰州大学第一医院消化科兰州730000 甘肃省消化系疾病临床研究中心兰州730000

目的建立可预测肝硬化患者发生急性肾脏病(acute kidney disease,AKD)的模型,并对其性能进行评价。方法回顾性连续纳入2017年1月—2022年1月于兰州大学第一医院消化科住院的肝硬化患者。根据住院期间是否发生AKD,将其分为AKD组和非AKD... 详细信息

目的建立可预测肝硬化患者发生急性肾脏病(acute kidney disease,AKD)的模型,并对其性能进行评价。方法回顾性连续纳入2017年1月—2022年1月于兰州大学第一医院消化科住院的肝硬化患者。根据住院期间是否发生AKD,将其分为AKD组和非AKD组,并按7∶3比例随机分为训练集和验证集。收集两组患者临床资料,采用LASSO回归和多因素Logistic回归法筛选肝硬化患者发生AKD的影响因素并建立预测模型,采用受试者工作特征曲线、校准曲线和临床决策曲线对模型进行评价。结果共入选符合纳入与排除标准的肝硬化患者796例。其中AKD组103例,非AKD组693例;训练集561例,验证集235例。LASSO回归和多因素Logistic回归结果显示,糖尿病史(OR=2.922,95%CI:1.290~6.564,P=0.009)、肝性脑病(OR=6.210,95%CI:2.278~17.479,P<0.001)、消化道出血(OR=2.501,95%CI:1.236~5.073,P=0.011)、腹水(OR=3.219,95%CI:1.664~6.539,P<0.001)、男性(OR=0.477,95%CI:0.254~0.879,P=0.019)、血红蛋白(OR=0.987,95%CI:0.975~0.999,P=0.044)、白蛋白(OR=0.952,95%CI:0.911~0.991,P=0.023)、凝血酶时间(OR=0.865,95%CI:0.779~0.920,P<0.001)是肝硬化患者发生AKD的独立影响因素,并以此构建列线图预测模型。模型在训练集、验证集中预测肝硬化患者发生AKD的曲线下面积分别为0.895(95%CI:0.865~0.925)、0.869(95%CI:0.807~0.930);校准曲线显示,模型的拟合度、一致性均良好;临床决策曲线显示,整体而言使用模型预测AKD发生风险可使肝硬化患者获益。结论基于性别、糖尿病史、肝性脑病等8个影响因素建立了肝硬化患者发生AKD的预测模型,经验证该模型具有良好的区分度、校准度和临床实用性,有望辅助临床进行肝硬化相关AKD的早期筛查与识别。

关键词：肝硬化急性肾脏病列线图预测模型

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Microwave absorption properties of Ni/C@SiC composites prepared by precursor impregnation and pyrolysis processes

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Defence Technology（防务技术） 2023年第3期21卷 94-102页

作者： Xinli Ye Junxiong Zhang zhaofeng chen Junfeng Xiang Yun Jiang Faqin Xie Xiaomin Ma School of Civil Aviation Northwestern Polytechnical UniversityXi'an710072PR China Suzhou Qinyun Fiber Assemblies Technology Co.LTD Suzhou215400PR China School of Textile and Clothing Nantong UniversityNantong226019PR China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing211106PR China College of Textile Science and Engineering Jiangnan UniversityWuxi214122PR China National Equipment New Material&Technology(Jiangsu)Co.LTD Suzhou215400PR China

In the present study,the unique three-dimensional graphene coated nickel(Ni/C)foam reinforced silicon carbide(Ni/C@SiC)composites were first obtained via the precursor impregnation and pyrolysis(PIP)*** microstructure images indicated that the SiC fillers were successfully prepared in the skeleton pores of the Ni/C *** influence of the PIP cycles on the microwave absorption performances was researched,and the results indicated that after the primary PIP process,Ni/C@SiC-I possessed the optimal microwave absorbing performance with a minimum reflection loss(RL)of-25.87 d B at 5.28 GHz and 5.00 ***,the RL values could be below-10.00 dB from 5.88 GHz to 7.74 GHz when the corresponding matching thickness was 3.85 ***,the microwave absorption properties of Ni/C@SiC-II and Ni/C@SiC-Ⅲwere tremendously degraded as the PIP times *** last,the electromagnetic parameter,dielectric loss,attenuation constant as well as impedance matching coefficient were further investigated to analyze the absorbing mechanism,which opened a new path for the certain scientific evaluation of the absorbing materials and had extremely important to the defence technology.

关键词： composites Ni/C absorption

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Morphology and Mechanical Characteristics of Monolayer and Multilayer Ir Coating by Double Glow Plasma

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 190-196页

作者：吴王平 JIANG Jinjin chen zhaofeng JIANG Peng WANG Zhizhi School of Mechanical Engineering Changzhou University College of Material Science and Technology Nanjing University of Aeronautics and Astronautics

Multilayer iridium coating was manufactured on tungsten carbide substrates by a double glow plasma *** comparison,monolayer was also *** microstructure and morphology were observed using scanning electron *** orientation and phase were determined using X-ray *** residual stress of the coating was studied by glancing incidence X-ray *** adhesive force of the coating was measured by a scratch *** results showed that both monolayer and multilayer had a polycrystalline phase with a strong（110） *** coating had an excellent adhesion with no evidence of *** adhesive force of the monolayer and multilayer was about 50 and 43 N,*** interfacial reaction between the substrate and the layer occurred and a new WIr phase was found due to the high-temperature deposition *** residual stress in the monolayer and multilayer was-1.6 and-1.1 GPa,respectively.

关键词： morphology residual stress adhesive force monolayer multilayer iridium

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