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Light emission of double-walled carbon nanotube filaments doped with yttrium and europium

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Science China(Technological Sciences) 2009年第1期52卷 252-255页

作者： SHU QinKe WANG KunLin WEI JinQuan ZHU HongWei LI XinMing CHEN Xi JIA Yi gui xuchun XU ErYang WU DeHai Key Laboratory for Advanced Manufacturing by Materials Processing Technology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

As the potential applications of carbon nanotubes in the field of electroluminescence, elements yttrium and europium were introduced to modify the emission properties of double-walled carbon nanotubes (DWNTs) to obtain higher efficacy and other properties. The light emission spectrum of the Y-Eu-doped DWNT filament is suppressed in the near-infrared range, while enhanced in the mid-infrared range. The doped DWNT filament can reach higher efficacy than that of the pure DWNT filament at the same input power and can work stably as long as 5000 h at 12 V. These filaments could be useful for the light sources with special functions, such as infrared light sources operated at low input power.

关键词： carbon nanotubes electroluminescence efficacy yttrium europium

Stretchable, self‐healable, and breathable biomimetic iontronics with superior humidity‐sensing performance for wireless respiration monitoring

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SmartMat 2023年第2期4卷 88-105页

作者： Qiongling Ding Hao Wang Zijing Zhou Zixuan Wu Kai Tao xuchun gui Chuan Liu Wenxiong Shi Jin Wu State Key Laboratory of Optoelectronic Materials and Technologies the Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhouChina Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical UniversityXi'anChina Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina

Stretchable,self‐healing,and breathable skin‐biomimetic‐sensing iontronics play an important role in human physiological signal monitoring and human–computer ***,previous studies have focused on the mimicking of skin tactile sensing(pressure,strain,and temperature),and the development of more functionalities is *** this end,a superior humidity‐sensitive ionic skin is developed based on a self‐healing,stretchable,breathable,and biocompatible polyvinyl alcohol–cellulose nanofibers organohydrogel film,showing a pronounced thickness‐dependent humidity‐sensing *** as‐prepared 62.47‐μm‐thick organohydrogel film exhibits a high response(25,000%)to 98%RH,excellent repeatability,and long‐term stability(120 days).Moreover,this ionic skin has excellent resistance to large mechanical deformation and damage,and the worn‐out material can still retain its humidity‐sensing capabilities after self‐***‐sensing mechanism studies show that the induced response is mainly related to the increase of proton mobility and interfacial charge transport efficiency after water *** superior humidity responsiveness is attributed to the reduced thickness and the increased specific surface area of the organohydrogel film,allowing real‐time recording of physiological ***,by combining with a self‐designed printed circuit board,a continuous and wireless respiration monitoring system is developed,presenting its great potential in wearable and biomedical electronics.

关键词： biomimetic iontronics humidity sensor organohydrogel film self‐healable and breathable wireless respiration monitoring

Multiscale nanowire-microfluidic hybrid strain sensors with high sensitivity and stretchability

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npj Flexible Electronics 2018年第1期2卷 127-136页

作者： Songjia Han Chunrui Liu Huihua Xu Dongyuan Yao Kanghong Yan Huanliang Zheng Hui-Jiuan Chen xuchun gui Sheng Chu Chuan Liu State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory for Optoelectronics Materials and Technology School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

Nanomaterials with low-dimensional morphology have been explored for enhancing the performance of strain sensors,but it remains difficult to achieve high stretchability and sensitivity *** this work,a composite structure strain sensor based on nanomaterials and conductive liquid is designed,demonstrated,and *** nanowire-microfluidic hybrid(NMH)strain sensor responds to multiscale strains from 4%to over 400%,with a high sensitivity and durability under small *** nanowires and carbon nanotubes are used to fabricate the NMH strain sensors,which simultaneously exhibit record-high average gauge factors and stretchability,far better than the conventional nanowire *** modeling of the electrical characteristics reveals that the effective conductivity percolation through the hybrid structures is the key to achieving high gauge factors for multiscale *** sensors can operate at low voltages and are capable of responding to various mechanical *** fixed on human skin,the sensors can monitor large-scale deformations(skeleton motion)and small-scale deformations(facial expressions and pulses).The sensors are also employed in multichannel,interactive electronic system for wireless control of *** demonstrations indicate the potential of the sensors as wearable detectors for human motion or as bionic ligaments in soft robotics.

关键词： strain gauge fluid

Controlling sulfurization of 2D Mo_(2)C crystal for Mo_(2)C/MoS_(2)-based memristor and artificial synapse

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npj Flexible Electronics 2022年第1期6卷 917-924页

作者： Xin Tang Leilei Yang Junhua Huang Wenjun Chen Baohua Li Shaodian Yang Rongliang Yang Zhiping Zeng Zikang Tang xuchun gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Department of physics Guangxi Minzu UniversityNanning 530006China School of Electronic Information Engineering Foshan UniversityFoshan 528000P.R.China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China

Owing to the conductance-adjustable performance,the emerging two-terminal memristors are promising candidates for artificial synapses and brain-spired neuromorphic *** memristors based on molybdenum disulfide(MoS_(2))have displayed outstanding performance,such as thermal stability and high energy efficiency,reports on memristors based on MoS_(2) as the functional layer to simulate synaptic behavior are ***,a homologous Mo_(2)C/MoS_(2)-based memristor is prepared by partially sulfuring two-dimensional Mo_(2)C *** memristor shows good stability,excellent retention(~104 s)and endurance(>100 cycles),and a high ON/OFF ratio(>10^(3)).Moreover,for comprehensively mimicking biological synapses,the essential synaptic functions of the device are systematically analyzed,including paired-pulse facilitation(PPF),short-term plasticity(STP),long-term plasticity(LTP),long-term depression(LTD),and the transitions from STP to ***,this artificial synapse could keep a highlevel stable memory for a long time(60 s)after repeated *** results prove that our device is highly desirable for biological synapses,which show great potential for application in future high-density storage and neuromorphic computing systems.

关键词： artificial sulfur stability

Actively logical modulation of MEMS-based terahertz metamaterial

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Photonics Research 2021年第7期9卷 1409-1415页

作者： RUIJIA XU XIAOCAN XU BO-RU YANG xuchun gui ZONG QIN YU-SHENG LIN School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510006China

The integration of micro-electro-mechanical system (MEMS) with metamaterial has provided a novel route to achieve programmability via its reconfigurable capabilities. Here,we propose and demonstrate a MEMS-based metadevice by using switchable winding-shaped cantilever metamaterial (WCM) for active logical *** can be actuated by external driving voltage,and the logical modulation bit is performed by releasing MEMS cantilevers to represent "on" and "off" states. While the underneath substrate surface of a MEMS-based metadevice is rough after releasing the cantilevers,the metadevice is allowed to operate on the reconfigurable switching state and avoid the snapping down of the device when the system is overloaded. Such a reconfigurable and programmable MEMS-based metadevice exhibits multifunctional characteristics to simultaneously perform the logic operations of "OR" and "AND" gates. By exploiting the tuning mechanism of the MEMS-based metadevice,the arbitrary metamaterial configuration can be implanted into WCM. This opens a wide avenue to further enlarge the operating frequency range and applications in optoelectronic fields. These unique results provide various possibilities in multifunctional switching,active logical modulating,and optical computing applications.

关键词： tuning cantilever winding

Controllable Fabrication of Wrinkled Graphene for Strain Sensors Applications

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Controllable Fabrication of Wrinkled Graphene for Strain Sen...

第二届海峡两岸功能材料科技与产业峰会（2015）

作者： Wenjun Chen xuchun gui Zikang Tang State Key Lab of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-sen University Department of Physics Hong Kong University of Science and Technology

Wrinkles,which are folds or creases in a material,are unavoidable to be formed in graphene,whatever the graphene is prepared by micromechanical exfoliation from graphite or chemical vapor deposition(CVD).However,the controllable formation and structures of wrinkles in graphene remains a big *** this talk,we report a liquid-phase shrink method to controllably fabricate large-scale wrinkled *** CVD

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来源： cnki会议评论

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cnki会议

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第四过渡族金属基准晶形成规律的抛物线模型

稀有金属材料与工程 2006年第7期35卷 1080-1084页

作者：桂许春廖树帜谢浩文张邦维湖南师范大学中国科学院国际材料物理中心辽宁沈阳110015 中国科学院国际材料物理中心湖南大学湖南长沙410082

利用键参数函数和尺寸因数对第四长周期过渡族金属元素基准晶形成规律进行研究。发现可以用抛物线y=a–bx2将准晶形成区与准晶不能形成区区分开,准晶形成区的准确率达到了93.12%。同时,发现抛物线的参数a,b可以由基体元素的相关参数确定... 详细信息

利用键参数函数和尺寸因数对第四长周期过渡族金属元素基准晶形成规律进行研究。发现可以用抛物线y=a–bx2将准晶形成区与准晶不能形成区区分开,准晶形成区的准确率达到了93.12%。同时,发现抛物线的参数a,b可以由基体元素的相关参数确定,即a∝E,b∝EμR03。

关键词：准晶抛物线模型键参数函数尺寸因素

Stretchable,Transparent,and Ultra-Broadband Terahertz Shielding Thin Films Based on Wrinkled MXene Architectures

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Nano-Micro Letters 2024年第9期16卷 110-122页

作者： Shaodian Yang Zhiqiang Lin Ximiao Wang Junhua Huang Rongliang Yang Zibo Chen Yi Jia Zhiping Zeng Zhaolong Cao Hongjia Zhu Yougen Hu Enen Li Huanjun Chen Tianwu Wang Shaozhi Deng xuchun gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275People’s Republic of China China Academy of Aerospace Science and Innovation Beijing 100176People’s Republic of China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China GBA Branch of Aerospace Information Research Institute Chinese Academy of SciencesGuangzhou 510700People’s Republic of China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049People’s Republic of China Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics Guangzhou 510700People’s Republic of China

With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)shielding *** EMI shielding materials,like opaque metals and carbon-based films,face challenges in achieving both high transparency and high shielding efficiency(SE).Here,a wrinkled structure strategy was proposed to construct ultra-thin,stretchable,and transparent terahertz shielding MXene films,which possesses both isotropous wrinkles(height about 50 nm)and periodic wrinkles(height about 500 nm).Compared to flat film,the wrinkled MXene film(8 nm)demonstrates a remarkable 36.5%increase in SE within the THz *** wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm,and an average EMI SE/t of 700 dBμm^(−1)over the 0.1-10 *** calculations suggest that the wrinkled structure enhances the film’s conductivity and surface plasmon resonances,resulting in an improved THz wave ***,the wrinkled structure enhances the MXene films’stretchability and *** bending and stretching(at 30%strain)cycles,the average THz transmittance of the wrinkled film is only 0.5%and 2.4%,*** outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.

关键词： Terahertz Wrinkle structure Electromagnetic interference shielding MXene

Controllable formation of periodic wrinkles in Marangoni-driven self-assembled graphene film for sensitive strain detection

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Science China Materials 2020年第10期63卷 1983-1992页

作者： Yufei Jia Wenjun Chen Chen Ye Rongliang Yang Leilei Yang Zian Zhang Qingmei Hu Binghao Liang Bo-Ru Yang Zikang Tang Cheng-Te Lin xuchun gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201China Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China

Controllable formation of microstructures in the assembled graphene film could tune the physical properties and broaden its applications in flexible *** efforts have been made to control the formation of wrinkles and ripples in graphene ***,the formation of orderly wrinkles in graphene film remains a ***,we reported a simple strategy for the fabrication of graphene film with periodic and parallel wrinkles with a pre-stretched polydimethylsiloxane *** width of the wrinkles in graphene can be controlled by changing the pre-stretched strain of the *** average width of wrinkles in graphene film on the substrate with pre-stretched strain of 10%,20%,and 50%was about 3.68,2.99 and 2.01µm,*** morphological evolution of wrinkled double-layered graphene under mechanical deformation was observed and ***,a strain sensor was constructed based on the wrinkled graphene,showing high sensitivity,large working range and excellent cyclic *** strain sensors show great potential in real-time motion detection,health surveillance and electronic skins.

关键词： wrinkled double-layered structure solution-processed assembled graphene film Marangoni effect strain sensor