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Substrate screening for superclean graphene growth using firstprinciples calculations

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Nano Research 2024年第4期17卷 2216-2222页

作者： Zhihao Li Xiucai Sun Xiaoli Sun Wan-Jian Yin zhongfan Liu College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)and Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China Graphene Basic Science Research Center Beijing Graphene Institute(BGI)Beijing 100095China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Suppressing the formation of amorphous surface carbon and contaminants during the preparation of graphene by chemical vapor deposition remains an ongoing ***,we analyzed how substrate characteristics affect graphene quality by simulating margin extension,the nucleation process,and defect pegging configurations on mono-crystalline oriented metal substrates with the aim of enhancing graphene *** formation energy and nucleation potential,which are indirect substrate–graphene interaction features,were found to appropriately evaluate graphene *** crystallographic orientation of the metal substrate was discovered to be critical for producing superclean graphene.A low graphene defect density and high nucleation rate on the Cu(100)facet guarantee growth of high-quality graphene,especially in terms of suppressing the formation of amorphous *** addition,rapid kink growth and self-healing on the Cu(100)facet facilitate rapid graphene synthesis,which is also promoted by rapid kink splicing and margin self-repair on this *** study provides theoretical insight useful for the synthesis of superclean graphene.

关键词： superclean graphene defects nucleation metal substrates density functional theory calculations

Transfer-free chemical vapor deposition graphene for nitride epitaxy: challenges, current status and future outlook

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Science China Chemistry 2024年第3期67卷 824-840页

作者： Xiang Gao Senlin Li Jingfeng Bi Kaixuan Zhou Meng Li zhongfan Liu Jingyu Sun College of Energy Soochow Institute for Energy and Materials InnovationsSUDA-BGI Collaborative Innovation CenterKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Beijing Graphene Institute Beijing 100095China Xiamen Silan Advanced Compound Semiconductor Co.Ltd. Xiamen 361026China

Graphene, a two-dimensional material with outstanding electrical and mechanical properties, has attracted considerable attention in the field of semiconductor technologies due to its potential use as a buffer layer for the epitaxial Ⅲ-nitride growth. In recent years, significant progress has been made in the chemical vapor deposition growth of graphene on various insulating substrates for the nitride epitaxy, which offers a facile, inexpensive, and easily scalable methodology. However, certain challenges are still present in the form of producing high-quality graphene and achieving optimal interface compatibility with Ⅲ-nitride *** this review, we provide an overview of the bottlenecks associated with the transferred graphene fabrication techniques and the state-of-the-art techniques for the transfer-free graphene growth. The present contribution highlights the current progress in the transfer-free graphene growth on different insulating substrates, including sapphire, quartz, SiO_(2)/Si, and discusses the potential applications of transfer-free graphene in the Ⅲ-nitride epitaxy. Finally, it includes the prospects of the transfer-free graphene growth for the Ⅲ-nitride epitaxy and the challenges that should be overcome to realize its full potential in this field.

关键词： Transfer-free chemical vapor deposition graphene for nitride epitaxy challenges current status and future outlook graphene

Theoretical investigations on the growth of graphene by oxygenassisted chemical vapor deposition

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Nano Research 2024年第6期17卷 4645-4650页

作者： Xiaoli Sun Chaojie Yu Yujia Yang Zhihao Li Jianjian Shi Wanjian Yin zhongfan Liu Beijing Graphene Institute(BGI) Beijing 100095China School of Physics and Electronics Shandong Normal UniversityJinan 250014China College of Energy Soochow Institute for Energy and Materials InnovationsLight Industry Institute of Electrochemical Power SourcesSUDA-BGI Collaborative Innovation CenterSoochow UniversitySuzhou 215006China School of Electronic Engineering Chengdu Technological UniversityChengdu 611730China Center for Nanochemistry Beijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Recently,graphene has drawn considerable attention in the field of electronics,owing to its favorable conductivity and high carrier *** to the industrialization of graphene is its high-quality microfabrication via chemical vapor ***,many problems remain in its preparation,such as the not fully understood cracking mechanism of the carbon source,the mechanism of its substrate oxidation,and insufficient defect repair *** help close this capability gap,this study leverages density functional theory to explore the role of O in graphene *** effects of Cu substrate oxidation on carbon source cracking,nucleation barriers,crystal nucleus growth,and defect repairs are *** was found to reduce energy change during dehydrogenation,rendering the process ***,the adsorbed O in graphene or its Cu substrate can promote defect repair and edge growth.

关键词： density functional theory oxygen-assisted graphene growth chemical vapor deposition Cu substrate

Invisible vapor catalysis in graphene growth by chemical vapor deposition

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Nano Research 2024年第5期17卷 4259-4269页

作者： Xiucai Sun Xiaoting Liu Zhongti Sun Xintong Zhang Yuzhu Wu Yeshu Zhu Yuqing Song Kaicheng Jia Jincan Zhang Luzhao Sun Wan-Jian Yin zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Department of Engineering University of CambridgeCambridge CB30FAUK College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China

Vapor catalysis was recently found to play a crucial role in superclean graphene growth via chemical vapor decomposition(CVD).However,knowledge of vapor-phase catalysis is scarce,and several fundamental issues,including vapor compositions and their impact on graphene growth,are ***,by combining density functional theory(DFT)calculations,an ideal gas model,and a designed experiment,we found that the vapor was mainly composed of Cui clusters with tens of *** vapor pressure was estimated to be~10^(-12)-10^(-1)1 bar under normal low-pressure CVD system(LPCVD)conditions for graphene growth,and the exposed surface area of Cui clusters in the vapor was 22-269 times that of the Cu substrate surface,highlighting the importance of vapor *** calculations show Cu clusters,represented by Cu17,have strong capabilities for adsorption,dehydrogenation,and decomposition of *** exhibit an adsorption lifetime and reaction flux six orders of magnitude higher than those on the Cu surface,thus providing a sufficient supply of active C atoms for rapid graphene growth and improving the surface cleanliness of the synthesized *** experimental validation showed that increasing the amount of Cu vapor improved the as-synthesized graphene growth rate and surface *** study provides a comprehensive understanding of vapor catalysis and the fundamental basis of vapor control for superclean graphene rapid growth.

关键词： vapor catalysis graphene growth chemical vapor deposition first-principles calculation

国内外反兴奋剂对比研究--基于Citespace的知识图谱分析

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湖北体育科技 2020年第2期39卷 113-119页

作者：刘杨婷吕中凡史鹏辽宁师范大学体育学院辽宁大连116029 辽宁省运动人体科学重点实验室辽宁大连116029

以Web of Science核心合集和中国知网收录的592篇反兴奋剂研究主题的文献为研究对象,借助CiteSpace软件对国内外反兴奋剂研究发文趋势、作者、机构、研究热点及趋势进行分析。结果显示:体育领域反兴奋剂研究起于20世纪90年代,呈现缓慢... 详细信息

以Web of Science核心合集和中国知网收录的592篇反兴奋剂研究主题的文献为研究对象,借助CiteSpace软件对国内外反兴奋剂研究发文趋势、作者、机构、研究热点及趋势进行分析。结果显示:体育领域反兴奋剂研究起于20世纪90年代,呈现缓慢起步、波浪式发展的研究趋势,研究高峰多集中于奥运会前后;国内杨彬龄是该领域的核心作者,但学者间尚未形成稳定的合作关系;国外没有突出的核心研究者,大多较为均衡,且合作关系较为密集;国内研究机构以北京体育大学和湘潭大学为核心,但各机构之间缺乏合作,多以独立研究为主;国外以哥本哈根大学为核心,且较多机构合作紧密;我国学者在反兴奋剂的社会文化学、法理学等层面有着丰富的学术理论探讨,国外更注重于兴奋剂检测技术的开发与实践。建议国内学者、机构之间加强合作,进一步提高高产作者和高产机构的数量,鼓励研究人员从不同角度对反兴奋剂问题进行关注与研究,聚焦于高水平运动员的调查、检测技术的实证研究、社会心理学调研等前沿问题。

关键词：反兴奋剂知识图谱可视化 CiteSpace

Ultraclean transfer of graphene by mechanically exfoliating polymer with modified crosslink density

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Nano Research 2024年第8期17卷 6795-6802页

作者： Qi Lu Jiawei Yang Chaofan Zhou Zhaoning Hu Saiyu Bu Bingbing Guo Yixuan Zhao Junhao Liao Mingpeng Shang Ge Chen Kaicheng Jia Jianbo Yin Qiang Zeng Li Lin zhongfan Liu College of Science China University of Petroleum(Beijing)Beijing 102249China School of Materials Science and Engineering Peking UniversityBeijing 100871China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Department of Electronics Peking UniversityBeijing 100871China Second Clinical Division National Engineering Laboratory for Digital and Material Technology of StomatologyPeking University School and Hospital of StomatologyBeijing 100081China

The transfer of graphene from metallic substrates onto application-specific substrates is usually inevitable for the applications of high-quality graphene films derived from chemical vapour deposition(CVD)*** used to support the graphene films during the transfer,the coating of the polymer would produce the surface contaminations and hinder the industrially compatible *** this work,through the thermal imidization of polyamide acid(PAA)to polyimide(PI)and tuning of the concentration of dangling chains,we achieved the ultraclean and crack-free transfer of graphene wafers with high electronic *** resulting contamination-free and hydrophilic surface also enabled the observed improved cell viability in a biomedical *** avoiding aqueous etching or the usage of strong bases,our proposed transfer method is industrially compatible for batch transfer of graphene films towards the real applications.

关键词： chemical vapour deposition(CVD)graphene films graphene transfer ultraclean transfer transfer medium crosslink density cell viability assay

Feasibility of Scaling up the Cost-Competitive and Clean Electrolytic Hydrogen Supply in China

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Engineering 2024年第8期39卷 154-165页

作者： Guangsheng Pan Wei Gu zhongfan Gu Jin Lin Suyang Zhou Zhi Wu Shuai Lu School of Electrical Engineering Southeast UniversityNanjing 210096China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

Scaling up clean hydrogen supply in the near future is critical to achieving China’s hydrogen development *** study established an electrolytic hydrogen development mechanism considering the generation mix and operation optimization of power systems with access to *** on the incremental cost principle,we quantified the provincial and national clean hydrogen production cost performance levels in *** results indicated that this mechanism could effectively reduce the production cost of clean hydrogen in most provinces,with a national average value of less than 2 USD·kg^(-1) at the 40-megaton hydrogen supply *** cooperation via power transmission lines could further reduce the production cost to 1.72 USD·kg^(-1).However,performance is affected by the potential distribution of hydrogen *** the supply side,competitiveness of the mechanism is limited to clean hydrogen production,while from the demand side,it could help electrolytic hydrogen fulfil a more significant *** study could provide a solution for the ambitious development of renewables and the hydrogen economy in China.

关键词： Low-carbon energy system Electrolytic hydrogen Renewables Cost optimization and analysis

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中超联赛主场优势的技术特征与成因

湖北体育科技 2020年第6期39卷 519-524,564页

作者：金成吉周靖昊史鹏吕中凡辽宁师范大学体育学院辽宁大连116029 辽宁省运动人体科学重点实验室辽宁大连116029

本文采用文献资料法和数理统计法,针对当前研究较少的中超联赛技术层面,通过对2018赛季中超球队的各项数据对其技术特征进行研究,分析形成中超联赛主场优势的影响因素。结论表明:中超联赛确实存在较为明显的主场优势现象(H/AD=21%>5%),... 详细信息

本文采用文献资料法和数理统计法,针对当前研究较少的中超联赛技术层面,通过对2018赛季中超球队的各项数据对其技术特征进行研究,分析形成中超联赛主场优势的影响因素。结论表明:中超联赛确实存在较为明显的主场优势现象(H/AD=21%>5%),对主、客场14项技术指标数据进行独立样本t检验和判别分析,探索出真正影响主场优势的关键技术指标:场均射门次数(SC=0.702)、定位球进球数量(SC=0.584)、点球进球数量(SC=0.416)和场均失球数量(SC=-0.366)。对影响中超联赛中主场优势的重要因素进行定性与定量分析,得出观众、环境、判罚、心理以及旅途是影响主、客场球队技术发挥的主要因素。以期为中超球队如何合理利用其主场优势,以及如何避免对手主场优势的无限放大提供理论参考和借鉴。

关键词：中超联赛主场优势技术特征成因研究

足球运动员“3V2”进攻战术决策场景下的视觉信息加工特征

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首都体育学院学报 2023年第2期35卷 187-195页

作者：史鹏吕中凡孙金月王国动魏征章冬杨张铎耀上海体育学院体育教育学院上海200438 辽宁师范大学体育学院辽宁大连116029 辽宁省运动人体科学重点实验室辽宁大连116029

目的:探讨足球运动员“3V2”进攻战术决策场景下的视觉信息加工特征。方法:采用“专家-新手”范式,以8名CUFA足球联赛运动员为专家组,以8名足球专项大学生为新手组,以真实比赛录像还原拍摄成的视频为刺激材料,采用Dikablis Professiona... 详细信息

目的:探讨足球运动员“3V2”进攻战术决策场景下的视觉信息加工特征。方法:采用“专家-新手”范式,以8名CUFA足球联赛运动员为专家组,以8名足球专项大学生为新手组,以真实比赛录像还原拍摄成的视频为刺激材料,采用Dikablis Professional头戴式眼动仪采集眼动信息,采用“D-lab 3.0”“SPSS 25.0”和“R 3.6.1”软件进行统计分析和绘图,基于Needleman Wunsch算法计算专家组的眼动轨迹相似度。结果:1)与新手组相比,专家组表现出快速与合理的战术决策(p<0.05);2)与新手组相比,专家组在空当区域、近端进攻球员区域和远端防守球员区域有着更少的注视次数(p<0.05);3)与新手组相比,专家组在空当区域有着更少的凝视次数(t=-2.331,p=0.021)和较长的凝视时间(t=2.007,p=0.048);4)与新手组相比,专家组有着更少的扫视次数(t=-2.325,p=0.022)、更短的扫视时间(t=-2.081,p=0.039)和更长的眼跳距离(t=2.147,p=0.034),注视点更加集中(p<0.05),在相同察觉目标数量的前提下注视目标更少(t=-2.306,p=0.023);5)专家组的眼动轨迹存在中低程度的相似性(0.139~0.559),其信息加工策略主要包括经济成本较低的外周视觉感知策略和经济成本较高的中央视觉感知策略。结论:专家组采用经济与合理的视觉搜索策略识别“3V2”进攻战术决策场景关键信息,且外周视觉感知策略优于中央视觉。建议:借鉴专家组视觉搜索策略,开发提高新手组专项认知的计算机辅助训练手段;专家组借鉴最优视觉搜索策略,进行外周视觉训练,节省扫视成本。

关键词：战术决策信息加工视觉搜索多目标追踪选择性注意足球