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Emerging MoS_(2)Wafer-Scale Technique for Integrated Circuits

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Nano-Micro Letters 2023年第3期15卷 129-170页

作者： Zimeng Ye Chao Tan Xiaolei Huang Yi Ouyang Lei Yang zegao wang Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Interdisciplinary Nanoscience Center Aarhus University8000 Aarhus CDenmark

As an outstanding representative of layered materials,molybdenum disulfide(MoS_(2))has excellent physical properties,such as high carrier mobility,stability,and abundance on earth.Moreover,its reasonable band gap and microelectronic compatible fabrication characteristics makes it the most promising candidate in future advanced integrated circuits such as logical electronics,flexible electronics,and focal-plane photodetector.However,to realize the all-aspects application of MoS_(2),the research on obtaining high-quality and large-area films need to be continuously explored to promote its industrialization.Although the MoS_(2)grain size has already improved from several micrometers to sub-millimeters,the high-quality growth of wafer-scale MoS_(2)is still of great challenge.Herein,this review mainly focuses on the evolution of MoS_(2)by including chemical vapor deposition,metal–organic chemical vapor deposition,physical vapor deposition,and thermal conversion technology methods.The state-of-the-art research on the growth and optimization mechanism,including nucleation,orientation,grain,and defect engineering,is systematically summarized.Then,this review summarizes the wafer-scale application of MoS_(2)in a transistor,inverter,electronics,and photodetectors.Finally,the current challenges and future perspectives are outlined for the wafer-scale growth and application of MoS_(2).

关键词： Wafer-scale growth Molybdenum disulfide Gas deposition Integrated circuits

Tune the electronic structure of MoS_(2)homojunction for broadband photodetection

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Journal of Materials Science & Technology 2022年第24期119卷 61-68页

作者： Rui Tao Xianlin Qu zegao wang Fang Li Lei Yang Jiheng Li Dan wang Kun Zheng Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Beijing Key Lab of Microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China State Key Laboratory for Advanced Metals&Materials University of Science&Technology BeijingBeijing 100083China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Interdisciplinary Nanoscience Center Aarhus UniversityAarhus 8000Denmark

Due to the weak absorption and low light-matter interaction of MoS_(2),intrinsic MoS_(2)photodetector usually has low photoresponse,thus limiting its real application.Herein,MoS_(2)homojunction was constructed by using the chemical vapor deposition grown intrinsic MoS_(2)films and the Nb-doped MoS_(2)films.The results show that the Nb doping will induce p-type doping in MoS_(2),where the electron concentration will decrease by 2.08×10^(12)cm^(–2)after Nb doping.By investigating the photoelectric effect of MoS_(2)/Nb-doped MoS_(2)homojunction-based phototransistor,the tunability of the photoresponse,detectivity as the function of the external field,wavelength,and power of light have been studied in detail.The results show that the photoresponse and detectivity are strongly dependent on the gate voltage due to the external field tuned interlayer photoexcitation attributing to the band bending.The maximum of photoresponse can reach 51.4 A/W,the detectivity can reach 3.0×10^(12)Jones,which is two orders higher than that of intrinsic MoS_(2).Furthermore,by correlating the photoresponse and detectivity with the external field,it is found that the photodetection of MoS_(2)homojunction can be significantly tuned and exhibit well photodetection in infrared.This comprehensive work not only sheds light on the tunable photoexcitation mechanism but also offers a strategy to achieve a high-performance photodetector.

关键词： Molybdenum disulfide P-type doping Homojunction Photoresponse Tunability

Recent Progress in Emerging Two‑Dimensional Transition Metal Carbides

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Nano-Micro Letters 2021年第11期13卷 375-408页

作者： Tianchen Qin zegao wang Yuqing wang Flemming Besenbacher Michal Otyepka Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China Interdisciplinary Nanoscience Center Aarhus University8000 AarhusDenmark Regional Centre of Advanced Technologies and Materials Department of Physical ChemistryFaculty of SciencePalacky University77146 OlomoucCzech Republic

As a new member in two-dimensional materials family,transition metal carbides(TMCs)have many excellent properties,such as chemical stability,in-plane anisotropy,high conductivity and flexibility,and remarkable energy conversation efficiency,which predispose them for promising applications as transparent electrode,flexible electronics,broadband photodetectors and battery electrodes.However,up to now,their device applications are in the early stage,especially because their controllable synthesis is still a great challenge.This review systematically summarized the state-of-the-art research in this rapidly developing field with particular focus on structure,property,synthesis and applicability of TMCs.Finally,the current challenges and future perspectives are outlined for the application of 2D TMCs.

关键词： Two-dimensional transition metal carbides Phase diagram Superconductivity Energy conversation and storage Largescale synthesis

Ultrathin Ti_(3)C_(2)T_(x)（MXene） Nanosheet-Wrapped NiSe_(2) Octahedral Crystal for Enhanced Supercapacitor Performance and Synergetic Electrocatalytic Water Splitting

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Nano-Micro Letters 2019年第2期11卷 179-192页

作者： Hanmei Jiang zegao wang Qian Yang Luxi Tan Lichun Dong Mingdong Dong Interdisciplinary Nanoscience Center(iNANO) Aarhus University8000 Aarhus-CDenmark School of Chemistry and Chemical Engineering Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of EducationChongqing UniversityChongqing 400044People’s Republic of China College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Metal selenides,such as NiSe2,have exhibited great potentials as multifunctional materials for energy storage and conversation.However,the utilization of pure NiSe2 as electrode materials is limited by its poor cycling stability,low electrical conductivity,and insufficient electrochemically active sites.To remedy these defects,herein,a novel NiSe2/Ti3C2Tx hybrid with strong interfacial interaction and electrical properties is fabricated,by wrapping NiSe2 octahedral crystal with ultrathin Ti3C2Tx MXene nanosheet.The NiSe2/Ti3C2Tx hybrid exhibits excellent electrochemical performance,with a high specific capacitance of 531.2 Fg-1 at1 A g-1 for supercapacitor,low overpotential of 200 mV at 10 mA g-1,and small Tafel slope of 37.7 mV dec-1 for hydrogen evolution reaction(HER).Furthermore,greater cycling stabilities for NiSe2/Ti3C2Tx hybrid in both supercapacitor and HER have also been achieved.These significant improvements compared with unmodified NiSe2 should be owing to thestrong interfacial interaction between NiSe2 octahedral crystal and Ti3C2Tx MXene,which provides enhanced conductivity,fast charge transfer as well as abundant active sites,and highlight the promising potentials in combinations of MXene with metal selenides for multifunctional applications such as energy storage and conversion.

关键词： MXene NiSe_(2) Supercapacitor Water splitting

Tune the photoresponse of monolayer MoS_(2) by decorating CsPbBr_(3) perovskite nanoparticles

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Chinese Chemical Letters 2023年第7期34卷 345-349页

作者： Chao Tan Rui Tao Zhihao Yang Lei Yang Xiaolei Huang Yong Yang Fei Qi zegao wang College of Materials Science and Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072 China College of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

Tuning the photoresponse of monolayer MoS_(2) could extend its potential application in many fields,however,it is still a challenge.In this study,CsPbBr_(3) nanoparticles were prepared and spin-coated on the surface of monolayer MoS_(2) to fabricate hybrid CsPbBr_(3)/MoS_(2) photodetectors.By combing the photoelectrical property of the CsPbBr_(3),the synergistic effect has been systematically studied from its carrier mobility,photoresponse and detectivity.It was found that nanofilm-coating of CsPbBr_(3)would impede the photoelectric performance due to the electron-hole recombination facilitated by the defects at the interface of C PbBr_(3) and MoS_(2) films.While the nanoparticles decorating was observed to significantly improve the conductivity of the monolayer Mo S_(2),which also increased the on/off ratio of the MoS_(2) transistor from 8.2×10~3 to 4.4×10^(4),and enhanced the carrier mobility from 0.090 cm^(2)V^(-1)s^(-1)to 0.202 cm^(2)V^(-1)s^(-1),ascribing to a mixed electron recombination-injection process.Furthermore,the CsPbBr_(3) nanofilm would decrease the responsivity to 136 and 178 A/W under the light wavelength of 400 and 500 nm,respectively,while decorating CsPbBr_(3) nanoparticles improve the photoresponse to 948 and 883 A/W with the detectivity at the level of 10^(11)Jones.This work may provide an easy and cost-efficient way to tune the photoresponse of MoS_(2) photodetectors.

关键词： MoS_(2)photodetector CsPbBr_(3)NPs Surface charge doping Carrier mobility Photoresponse

MoP QDs@graphene as highly efficient electrocatalyst for polysulfide conversion in Li-S batteries

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Journal of Materials Science & Technology 2021年第31期90卷 37-44页

作者： Bo Yu Fei Ma Dongjiang Chen Katam Srinivas Xiaojuan Zhang Xinqiang wang Bin wang Wanli Zhang zegao wang Weidong He Yuanfu Chen School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054PR China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731PR China School of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000PR China College of Materials Science and Engineering Sichuan UniversityChengdu 610065PR China

The shuttle effect of lithium polysulfides(LiPSs)and sluggish redox conversion significantly hinder practical implementation of lithium-sulfur batteries(LSBs).To overcome these issues,herein,we present MoP quantum dots anchored N,P-doped graphene(MPQ@G)as a multifunctional LSB cathode.The N,P-doped graphene layers serve as a conductive skeleton to support the MoP QDs which can accelerate the electron transfer,physically hinder the polysulfide migration and thus enhance the electrochemical performance.More importantly,as a polar and conductive catalyst,MoP QDs provide catalytically active sites for the conversion of LiPSs.As a result,the LSBs with MPQ@G/S cathodes deliver an elevated initial capacity of 1220.2 mAh g~(-1)at 0.2 C and remain 98.9%after rate cycles,signifying its exceptional cycling stability.Moreover,it displays a large capacity of 681.2 mAh g~(-1)even at a high rate of 1 C.The Li-S pouch cell also presents high specific capacities and preeminent cycling stabilities,confirming its great potential for high-rate applications.Density functional theory calculations demonstrate the improved absorptivity and redox conversion reversibility of LiPSs.This work provides an efficient strategy to improve composite with highly adsorptive and catalytic properties for high-performance Li-S batteries.

关键词： MoP quantum dots Graphene Electrocatalyst Shuttle effect Li-S batteries

Reversible conductivity recovery of highly sensitive flexible devices by water vapor

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npj Flexible Electronics 2018年第1期2卷 253-262页

作者： Yuting wang Yingchun Su zegao wang Zhongyang Zhang Xiaojun Han Mingdong Dong Lifeng Cui Menglin Chen School of Environment and Civil Engineering Dongguan University of Technology523808 GuangdongChina Department of Engineering and Interdisciplinary Nanoscience Center Aarhus UniversityDK-8000 Aarhus CDenmark State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of Technology92 West Da-Zhi Street150001 HarbinChina

With decreasing size of integrated circuits in wearable electronic devices,the circuit is more susceptible to aging or fracture problem,subsequently decreasing the transmission efficiency of electricity.Micro-healing represents a good approach to solve this problem.Herein,we report a water vapor method to repair microfiber-based electrodes by precise positioning and rapid healing at their original fracture sites.To realize this micro-level conducting healing,we utilize a bimaterial composed of polymeric microfibers as healing agents and electrically conductive species on its surface.This composite electrode shows a high-performance conductivity,great transparency,and ultra-flexibility.The transmittance of our electrode could reach up to 88 and 90%with a sheet resistance of 1 and 2.8Ωsq^(−1),respectively,which might be the best performance among Au-based materials as we know.Moreover,after tensile failure,water vapor is introduced to mediate heat transfer for the healing process,and within seconds the network electrode could be healed along with recovering of its resistance.The recovering process could be attributed to the combination of adhesion force and capillary force at this bimaterial interface.Finally,this functional network is fabricated as a wearable pressure/strain sensing device.It shows excellent stretchability and mechanical durability upon 1000 cycles.

关键词： wear conductivity electrode

“厚基础、强实践、重创新”的材料类本科专业人才培养模式重构与实践

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工程科学与技术 2024年第2期56卷 17-23页

作者：杨劼人叶金文苟倩王泽高吴朝玲朱建国张云刘颖四川大学材料科学与工程学院四川成都610065

材料科学与工程是国家“四个面向”的重要支撑,先进材料及制造是国家战略性、基础性产业,是涉及国家安全的关键核心领域。本文针对国家对材料类高素质人才的迫切需求和传统材料类本科人才培养中存在的专业过度细分、实践能力偏弱、创新... 详细信息

材料科学与工程是国家“四个面向”的重要支撑,先进材料及制造是国家战略性、基础性产业,是涉及国家安全的关键核心领域。本文针对国家对材料类高素质人才的迫切需求和传统材料类本科人才培养中存在的专业过度细分、实践能力偏弱、创新能力不足等局限性问题,从一流高等院校本科生培养视角出发,依托四川大学厚重基础与综合优势,结合近二十年来材料科学与工程学院本科育人改革实践,系统阐释了“厚基础、强实践、重创新”的材料类本科人才培养特色与新模式。全文宗旨在于论述如何发挥“材料科学与工程”世界一流学科建设学科、一级学科国家重点学科的优势,服务国家重大需求和国民经济主战场,全面总结了系统性多层次育人探索和教学改革,对培养理想坚定、基础扎实、勇于创新的材料类优秀本科人才的具体内涵、实施路径及育人成效进行了思路分析与案例介绍,并对进一步持续改革工作进行了展望。

关键词：材料科学与工程本科专业人才培养教学改革

Synthesis,Characterization and Photocatalytic Properties of Doped Semiconducting Nano-particles

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Synthesis,Characterization and Photocatalytic Properties of ...