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PdSe_(2)/MoSe_(2) vertical heterojunction for self-powered photodetector with high performance

Nano Research 2022年第3期15卷 2489-2496页

作者： jiahong zhong Biao Wu Yassine MADOUNE Yunpeng Wang Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University A510aVirtual University BuildingSouthern DistrictHigh-tech Industrial ParkYuehai StreetNanshan DistrictShenzhen 518057China

Van der Waals’two-dimensional(2D)material heterostructure engineering offers an effective strategy for the design of multifunctional and high-performance optoelectronic devices.However,2D heterostructure photodetectors with a photoconductive effect tend to suffer from high driving source-drain voltages and significant dark noise currents.Herein,a self-powered photodetector with high performance was fabricated based on vertically stacked graphene/MoSe_(2)/PdSe_(2)/graphene heterojunctions through a dry transfer method.The fabricated device displays current rectification characteristics in darkness(on/off ratio>10^(3))and superior photovoltaic behaviors under illumination.In addition,benefitting from the strong built-in field,the Gr/PdSe_(2)/MoSe_(2)/Gr heterojunction photodetector is able to respond to a broad spectrum from visible to near-infrared(NIR)with a remarkable responsivity of 651 mA·W^(−1),a high specific detectivity of 5.29×10^(11) Jones and a fast response speed of 41.7/62.5μs.Moreover,an enhanced responsivity of 1.16 A·W^(−1) has been obtained by a reverse voltage(−1 V)and further evaluation on image recognition has also demonstrated the great application potential of the Gr/MoSe_(2)/PdSe_(2)/Gr heterojunction photodetector.The findings are expected to bring new opportunities for the development of highly sensitive,high-speed and energy-efficient photodetectors for comprehensive applications.

关键词： heterostructure MoSe_(2) PdSe_(2) self-powered photodetector high performance

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Observation of double indirect interlayer exciton in MoSe_(2)/WSe_(2) heterostructure

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Nano Research 2022年第3期15卷 2661-2666页

作者： Biao Wu Yunpeng Wang jiahong zhong Cheng Zeng Yassine Madoune Wanting Zhu Zongwen Liu Yanping Liu School of Physics and ElectronicsHunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University932 South Lushan RoadChangshaHunan 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangshaHunan 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University A510aVirtual University BuildingSouthern DistrictHigh-tech Industrial ParkYuehai StreetNanshan DistrictShenzhen 518057China

Interlayer excitons(IXS)are electron–hole pairs bound in the spatial separation layer by the Coulomb effect,and their lifetime is several orders of magnitude longer than that of direct excitons,providing an essential platform for long-lived exciton devices.The recent emergence of the van der Waals heterostructure(HS),which combines two layers of different transitional metal dichalcogenides(TMDs),has created new opportunities for IX research.Herein,we demonstrate the observation of double indirect interlayer excitons in the MoSe_(2)/WSe_(2)HS using photoluminescence(PL)spectroscopy.The intensities of the two peaks are essentially the same,and the energy difference is 22 meV,which is perfectly in line with the calculation result of density functional theory.Furthermore,the experience of variable excitation power also proves that the splitting of the IXs originates from the conduction band spin-splitting of MoSe_(2).The observation results provide a promising platform for further exploring the new physical properties and optoelectronic phenomena of TMD HS.

关键词： transitional metal dichalcogenides heterostructure interlayer exciton photoluminescence density functional theory

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Multifunctional catalytic sites regulation of atomic-scale iridium on orthorhombic-CoSe_(2)for high efficiency dual-functional alkaline hydrogen evolution and organic degradation

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Journal of Energy Chemistry 2024年第5期92卷 271-281页

作者： Jingjing Huang Chenglin zhong Yanjie Xia Jia Liu Guizhen Li Chao Yang jiahong Wang Qian Wang Zhenbao Zhang Feng Yan Jianghua Wu Yu Deng Zhenjiang Zhou Xingchen He Paul K.Chu Woon-Ming Lau Xue-Feng Yu College of Chemistry and Chemical Engineering Linyi UniversityLinyi 276005ShandongChina Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058ZhejiangChina Department of Physics Department of Materials Science and EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

The earth-abundant and high-performance catalysts are crucial for commercial implementation of hydrogen evolution reaction(HER).Herein,a multifunctional site strategy to construct excellent HER catalysts by incorporating iridium(Ir)ions on the atomic scale into orthorhombic-CoSe2(Ir-CoSe_(2))was reported.Outstanding hydrogen evolution activity in alkaline media such as a low overpotential of 48.7 mV at a current density of 10 mA cm^(-2)and better performance than commercial Pt/C catalysts at high current densities were found in the Ir-CoSe_(2) samples.In the experiments and theoretical calculations,it was revealed that Ir enabled CoSe_(2)to form multifunctional sites to synergistically catalyze alkaline HER by promoting the adsorption and dissociation of H_(2)O(Ir sites)and optimizing the binding energy for H^(*)on Co sites.It was noticeable that the electrolytic system comprising the Ir-CoSe_(2)electrode not only produced hydrogen efficiently via HER,but also degraded organic pollutants(Methylene blue).The cell voltage of the dual-function electrolytic system was 1.58 V at the benchmark current density of 50 mA cm^(-2),which was significantly lower than the conventional water splitting voltage.It was indicated that this method was a novel strategy for designing advanced HER electrocatalysts by constructing multifunctional catalytic sites for hydrogen production and organic degradation.

关键词： Orthorhombic-CoSe_(2) Multifunctional sites design Hydrogen evolution reaction Synergistically catalyze Methylene blue oxidation

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Spintronics in Two-Dimensional Materials

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Nano-Micro Letters 2020年第7期12卷 192-217页

作者： Yanping Liu Cheng Zeng jiahong zhong Junnan Ding Zhiming MWang Zongwen Liu School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083HunanPeople’s Republic of China Shenzhen Research Institute of Central South University A510aVirtual University BuildingSouthern DistrictHigh-Tech Industrial ParkYuehai StreetNanshan DistrictShenzhenPeople’s Republic of China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangsha 410083HunanPeople’s Republic of China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China School of Chemical and Biomolecular Engineering The University of SydneySydneyNSW 2006Australia

Spintronics,exploiting the spin degree of electrons as the information vector,is an attractive field for implementing the beyond Complemetary metal-oxide-semiconductor(CMOS)devices.Recently,two-dimensional(2D)materials have been drawing tremendous attention in spintronics owing to their distinctive spin-dependent properties,such as the ultralong spin relaxation time of graphene and the spin-valley locking of transition metal dichalcogenides.Moreover,the related heterostructures provide an unprecedented probability of combining the di erent characteristics via proximity e ect,which could remedy the limitation of individual 2D materials.Hence,the proximity engineering has been growing extremely fast and has made significant achievements in the spin injection and manipulation.Nevertheless,there are still challenges toward practical application;for example,the mechanism of spin relaxation in 2D materials is unclear,and the high-effciency spin gating is not yet achieved.In this review,we focus on 2D materials and related heterostructures to systematically summarize the progress of the spin injection,transport,manipulation,and application for information storage and processing.We also highlight the current challenges and future perspectives on the studies of spintronic devices based on 2D materials.

关键词： Spintronics 2D materials TMDCs Heterostructure Proximity effect

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数字经济下平台个性化定价的反垄断规制

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市场周刊 2024年第7期37卷 173-176页

作者：钟佳宏青岛科技大学法学院山东青岛266061

数字经济的发展大大促进了平台了解客户支付意愿的能力,可通过算法对个体消费者的购物偏好与支付意愿进行建模与预测,完成精准的用户画像。平台通过用户画像为用户制订个性化的价格,削弱消费者信任、损害消费者的隐私权和选择权并产生... 详细信息

数字经济的发展大大促进了平台了解客户支付意愿的能力,可通过算法对个体消费者的购物偏好与支付意愿进行建模与预测,完成精准的用户画像。平台通过用户画像为用户制订个性化的价格,削弱消费者信任、损害消费者的隐私权和选择权并产生垄断风险。我国需要针对平台个性化定价构建反垄断规制体系。

关键词：数字经济个性化定价算法反垄断

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High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet

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Nano Research 2020年第6期13卷 1780-1786页

作者： jiahong zhong Juan Yu Lingkai Cao Cheng Zeng Junnan Ding Chunxiao Cong Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha410083China School of Electronics and Information Hangzhou Dianzi UniversityHangzhou310018China School of Information Science and Technology Fudan UniversityShanghai200433China School of Chemical and Biomolecular Engineering The University of SydneySydneyNSW2006Australia Shenzhen Research Institute of Central South University Shenzhen518057China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha410083China

The extraordinary optical and electronic properties of anisotropic two-dimensional materials,such as black phosphorus,ReS2,and GeSe,enable them a promising component of polarization-sensitive photodetectors.However,these applications are significantly limited by the challenges of air-stability,response time,and linearly dichroic ratio.Interestingly,palladium diselenide(PdSe2)with high air stability is an emerging material that has robust in-plane anisotropy induced by its asymmetric pentagonal lattice structure.We have successfully prepared a few-layer PdSe2 using micromechanical exfoliation,and here we demonstrate the strong linear dichroism behavior of PdSe2 by polarization-resolved absorption spectra measurements.Such unique linear dichroism,endows the PdSe2 photodetector powerful ability to detect polarized light.The photodetector based on 5L PdSe2,as tested with polarization-dependent photocurrent mapping,exhibited competitive capability to detect polarized light,achieving a significant photocurrent on/off ratio(>10^2),the quite fast response time(<11 ms)and robust linearly dichroic ratios(/max//min≈1.9 at 532 nm).These results are essential advance in the development of polarization-sensitive photodetector,a crucial step towards opening up a new avenue for the application of 2D optoelectronic devices.

关键词： PdSe2 anisotropy polarization-sensitive linear dichroism

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水泥中三氧化硫含量技术检测与实验分析

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中国高新科技 2024年第1期 84-86页

作者：郭佳洪福建省交建集团工程检测有限公司福建厦门361021

文章以水泥三氧化硫含量检测技术作为切入点,简要叙述三氧化硫含量检测技术的类型、检测原理和应用情况,结合项目情况选择恰当技术种类,树立正确的检测思路。通过系统性阐述硫酸钡重量法、库伦滴定法与新型快速检测技术的实验过程及操... 详细信息

文章以水泥三氧化硫含量检测技术作为切入点,简要叙述三氧化硫含量检测技术的类型、检测原理和应用情况,结合项目情况选择恰当技术种类,树立正确的检测思路。通过系统性阐述硫酸钡重量法、库伦滴定法与新型快速检测技术的实验过程及操作要点,旨在建立一套标准化水泥三氧化硫含量检测技术体系,推动检测水准稳步提升,真实反映水泥三氧化硫含量情况,为同类项目检测作业开展提供技术指导。

关键词：水泥材料三氧化硫含量检测实验要点

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海上钻探作业平台的抛锚定位

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中国高新科技 2024年第4期 116-118页

作者：丁加宏周永江苏省水文地质海洋地质勘查院江苏淮安223005

通常用于海上钻探的平台分为自升式平台和浮式平台。浮式平台按其泊位形式又分锚泊定位与动力定位。对于浅海、近海工程钻探,主要使用锚泊定位,即在锚泊设备的作用下使钻探平台船在海上定位且漂移量很小。钻探平台在海上抛锚停泊时所使... 详细信息

通常用于海上钻探的平台分为自升式平台和浮式平台。浮式平台按其泊位形式又分锚泊定位与动力定位。对于浅海、近海工程钻探,主要使用锚泊定位,即在锚泊设备的作用下使钻探平台船在海上定位且漂移量很小。钻探平台在海上抛锚停泊时所使用的装置和机械统称为锚泊设备,主要包含锚、锚绳、绞锚机械、锚绳导向及系绳桩(将军柱)、发电机组等。

关键词：海上钻探平台抛锚定位

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一种基于电场分布特性的断路器外瓷套绝缘失效诊断方法

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电瓷避雷器 2024年第2期 137-146页

作者：汤宗尧陈昊纪洁钟汝莹何嘉弘祝艳华国网江苏省电力有限公司超高压分公司南京211102 东南大学电气工程学院南京210096

目前断路器在线监测手段无法对断路器外瓷套绝缘失效进行有效的诊断,定期检修无法及时诊断绝缘故障。变电站检修人员在巡视时通过电场测量发现一种电场分布的通用规律,因此,本研究提出一种基于电场分布特性的断路器外瓷套绝缘失效诊断... 详细信息

目前断路器在线监测手段无法对断路器外瓷套绝缘失效进行有效的诊断,定期检修无法及时诊断绝缘故障。变电站检修人员在巡视时通过电场测量发现一种电场分布的通用规律,因此,本研究提出一种基于电场分布特性的断路器外瓷套绝缘失效诊断方法。首先分析了断路器合闸状态的机械结构,基于模拟电荷法研究了断路器空间电场的分布特性,提出了电场强度“M”型曲线通用规律并通过仿真及实测验证,然后利用高压实验室对变电站绝缘失效的断路器外瓷套进行加压模拟试验,结合“M”型曲线的特征参数建立特征数据库并诊断断路器绝缘失效类型。研究结果表明,断路器外瓷套内、外绝缘失效会导致空间电场分布出现不同变化,通过捕捉电场特征数据可以有效监测并诊断绝缘失效故障,本研究方法可以为断路器乃至充气套管绝缘设备的绝缘失效问题提供新的诊断思路。

关键词：敞开式断路器绝缘失效电场强度 “M”型曲线故障诊断

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Whirligig‑Inspired Hybrid Nanogenerator for Multi‑strategy Energy Harvesting

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Advanced Fiber Materials 2023年第1期5卷 362-376页

作者： Xiaozhen Dan Ran Cao Xiaole Cao Yifei Wang Yao Xiong Jing Han Lan Luo jiahong Yang Nuo Xu Jia Sun Qijun Sun zhong Lin Wang Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physics and Electronics Central South UniversityChangsha 410083People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332‑0245USA

Portable energy solutions are highly desired in the era of the Internet of Things for powering various distributed micro-electronic devices.At the same time,the energy crisis and catastrophic global warming are becoming serious problems in the world,emphasizing the urgent need for clean and renewable energy.Here,we report a low-cost,high-performance,and portable hand-driven whirligig structured triboelectric–electromagnetic hybrid nanogenerator(whirligig-HNG)for multi-strategy energy harvesting.The whirligig-HNG comprises a dynamic supercoiling TENG via the pulling-strings and inner-distributed EMGs(variable number)in the rotator.The whirligig structure can readily convert linear displacement in low frequency into rotary motion in extremely high frequency.Based on this ingenious design,the whirligig-HNG is capable to harvest the triboelectric energy from the supercoiling/uncoiling process from the pulling strings and simultaneously utilize the high-frequency rotation energy via electromagnetic induction.We have systematically investigated the working mecha-nism of the whirligig-HNG for coupled energy harvesting and compared the individual characteristics of TENG and EMG.The whirligig-HNG is successfully demonstrated to light up more than 100 commercial light-emitting diodes(LEDs)and drive portable electronics.This research presents the enormous potential of whirligig-HNG as a manual and portable power supply for powering various portable electronics.

关键词： Whirligig-inspired Hybrid nanogenerator Triboelectric nanogenerator Electromagnetic nanogenerator Multi-strategy energy harvesting

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