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6-inch uniform vertically-oriented graphene on soda-lime glass for photothermal applications

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Nano Research 2018年第6期11卷 3106-3115页

作者： Haina Ci Huaying Ren Yue Qi Xudong Chen Zhaolong Chen jincan zhang Yanfeng zhang Zhongfan Liu Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Academy forAdvanced Interdisciplinary Studies Peking University Beijing 100871 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

Vertically-oriented graphene （VG） has many advantages over flat lying graphene, including a large surface area, exposed sharp edges, and non-stacking three-dimensional geometry. Recently, VG nanosheets assembled on specific substrates have been used for applications in supersensitive gas sensors and high-performance energy storage devices. However, to realize these intriguing applications, the direct growth of high-quality VG on a functional substrate is highly desired. Herein, we report the direct synthesis of VG nanosheets on traditional soda-lime glass due to its low-cost, good transparency, and compatibility with many applications encountered in daily life. This synthesis was achieved by a direct-current plasma enhanced chemical vapor deposition （dc-PECVD） route at 580℃, which is right below the softening point of the glass, and featured a scale-up size - 6 inches. Particularly, the fabricated VG nanosheets/glass hybrid materials at a transmittance range of 97%-34% exhibited excellent solarthermal performances, reflected by a 70%-130% increase in the surface temperature under simulated sunlight irradiation. We believe that this graphene glass hybrid material has great potential for use in future transparent ＂green-warmth＂ construction materials.

关键词： vertically oriented graphene (VG) soda-lime glass photothermal application antireflective material

Visualizing fast growth of large single-crystalline graphene by tunable isotopic carbon source

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Nano Research 2017年第2期10卷 355-363页

作者： Luzhao Sun1 Li Lin jincan zhang Huan Wang Hailin Peng Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China

The fast growth of large single-crystalline graphene by chemical vapor deposition on Cu foil remains a challenge for industrial-scale applications. To achieve the fast growth of large single-crystalline graphene, understanding the detailed dynamics governing the entire growth process--including nucleation, growth, and coalescence is important; however, these remain unexplored. In this study, by using a pulsed carbon isotope labeling technique in conjunction with micro-Raman spectroscopy identification, we visualized the growth dynamics, such as nucleation, growth, and coalescence, during the fast growth of large single- crystalline graphene domains. By tuning the supply of the carbon source, a growth rate of 320 μm/min and the growth of centimeter-sized graphene single crystals were achieved on Cu foil.

关键词： large single-crystalline graphene fast growth isotope labelling carbon source

基于机器学习算法构建浸润性肺腺癌预后预测模型

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中国胸心血管外科临床杂志 2025年第1期32卷 80-86页

作者：崔严奇杨鲸蓉倪琳连铎煌叶仕新廖毅张锦灿曾志勇福建医科大学福总临床医学院福州350025 联勤保障部队第九〇〇医院心胸外科福州350025 联勤保障部队第九〇〇医院普外科福州350025

目的确定肺腺癌(lung adenocarcinoma,LUAD)预后生物学标志物,并据此建立LUAD预后的预测模型。方法从UCSC数据库获取癌症基因组图谱(TCGA)LUAD基因表达量和临床病理数据,把纳入的数据进行综合生物信息学分析,包括差异表达基因(differe... 详细信息

目的确定肺腺癌(lung adenocarcinoma,LUAD)预后生物学标志物,并据此建立LUAD预后的预测模型。方法从UCSC数据库获取癌症基因组图谱(TCGA)LUAD基因表达量和临床病理数据,把纳入的数据进行综合生物信息学分析,包括差异表达基因(differentially expressed genes,DEGs)筛选、基因本体(GO)功能富集分析、京都基因与基因组百科全书(KEGG)分析和基因集富集分析(GSEA)。采用Cox分析和最小绝对值收缩和选择算子(least absolute shrinkage and selection operator,LASSO)回归分析构建基因组的风险评估预测模型,并采用列线图预测患者1年、2年、3年、5年和10年生存率。绘制Kaplan-Meier生存曲线、受试者工作特征(receiver operating characteristic,ROC)曲线和时间依赖性ROC曲线评价模型的预测能力。在验证组中校验模型。结果浸润性LUAD患者不同级别病理亚型间DEGs富集分析结果显示,280个DEGs主要参与细胞色素P450相关物质代谢、自然杀伤细胞介导的免疫反应、抗原的呈递和酶活性调节等生物学过程,与肿瘤的发生、发展密切相关。构建5个基因(MELTF、MAGEA1、FGF19、DKK4、C14ORF105)组成的风险预测模型,Cox分析和LASSO回归显示,模型的ROC曲线下面积(area under the curve,AUC)值为0.675,时间依赖性ROC曲线1年、3年、5年AUC值分别为0.893、0.713、0.632,表明该预测风险模型具有良好的敏感性和特异性。在验证组中,校准曲线和一致性指数(C指数)也表明构建的列线图预测性能较好。结论 5个基因组成的预测模型可作为LUAD患者生存率实用和可靠的预测工具,这可能有助于制定个体化治疗的临床决策,为患者预后预测提供一种新方法。

关键词：浸润性肺腺癌机器学习生物标志物风险评估模型列线图

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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

Rapid growth of angle-confined large-domain graphene bicrystals

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Nano Research 2017年第4期10卷 1189-1199页

作者： Huaying Ren Huan Wang Li Lin Miao Tang Shuli Zhao Bing Deng Manish Kumar Priydarshi jincan zhang Hailin Peng Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China

In the chemical vapor deposition growth of large-area graphene polycrystalline thin films, the coalescence of randomly oriented graphene domains results in a high density of uncertain grain boundaries （GBs）. The structures and properties of various GBs are highly dependent on the misorientation angles between the graphene domains, which can significantly affect the performance of the graphene films and impede their industrial applications. Graphene bicrystals with a specific type of GB can be synthesized via the controllable growth of graphene domains with a predefined lattice orientation. Although the bicrystal has been widely investigated for traditional bulk materials, no successful synthesis strategy has been presented for growing two-dimensional graphene bicrystals. In this stud34 we demonstrate a simple approach for growing well-aligned large-domain graphene bicrystals with a confined tilt angle of 30° on a facilely recrystallized single-crystal Cu （100） substrate. Control of the density of the GBs with a miso- rientation angle of 30° was realized via the controllable rapid growth of sub- centimeter graphene domains with the assistance of a cooperative catalytic surface-passivation treatment. The large-area production of graphene bicrystals consisting of the sole specific GBs with a tunable density provides a new material platform for fundamental studies and practical applications.

关键词： graphene bicrystal chemical vapor deposition surface engineering grain boundary heating device

The role of Cu crystallographic orientations towards growing superclean graphene on meter-sized scale

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Nano Research 2022年第4期15卷 3775-3780页

作者： Xiaoting Liu jincan zhang Wendong Wang Wei Zhao Heng Chen Bingyao Liu Mengqi zhang Fushun Liang Lijuan zhang Rui zhang Ning Li Yuexin zhang Yuchen Liu Kaicheng Jia Luzhao Sun Yixuan Zhao Peng Gao Qinghong Yuan Li Lin Hailin Peng Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China Department of Engineering University of CambridgeCambridgeCB30FAUK School of Physics and Astronomy University of ManchesterManchesterM139PLUK State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Electron Microscopy Laboratory and International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Centre for Theoretical and Computational Molecular Science Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD 4072Australia School of Materials Science and Engineering Peking UniversityBeijing 100871China

Chemical vapor deposition(CVD)-grown graphene films on Cu foils,exhibiting fine scalability and high quality,are still suffering from the adverse impact of surface contamination,i.e.,amorphous *** the recent successful preparation of superclean graphene through Cu-vapor-assisted reactions,the formation mechanism of amorphous carbon remains unclear,especially with regard to the functions of ***,we have found that the crystallographic orientations of underlying metal substrates would determine the cleanness of graphene in such a way that slower diffusion of active carbon species on asformed graphene-Cu(100)surface is the key factor that suppresses the formation of *** facile synthesis of clean graphene is achieved on the meter-sized Cu(100)that is transformed from the polycrystalline Cu ***,a clean surface of graphene on Cu(100)ensures the reduction of transfer-related polymer residues,and enhanced optical and electrical performance,which allows for versatile applications of graphene in biosensors,functioning as flexible transparent *** work would offer a promising material platform for the fundamental investigation and create new opportunities for the advanced applications of high-quality graphene films.

关键词： superclean graphene Cu crystallographic orientations Cu(100)foil improved electrical performance

Boric Acid-Assisted Pyrolysis for High-Loading Single-Atom Catalysts to Boost Oxygen Reduction Reaction in Zn-Air Batteries

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Energy & Environmental Materials 2024年第2期7卷 102-110页

作者： Chenxi Xu Jiexing Wu Liang Chen Yi Gong Boyang Mao jincan zhang Jinhai Deng Mingxuan Mao Yan Shi Zhaohui Hou Mengxue Cao Huanxin Li Haihui Zhou Zhongyuan Huang Yafei Kuang State Key Laboratory for Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China School of Chemistry and Chemical Engineering Key Laboratory of Hunan Province for Advanced Carbon-based Functional MaterialsHunan Institute of Science and TechnologyYueyang 414006China Advanced Technology Institute University of SurreyGuildford Surrey GU27XHUK Department of Engineering University of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK King's College London London SE11ULUK Department of Electrical and Electronic Engineering Imperial College LondonLondon SW72AZUK College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Department of Chemistry Physical&Theoretical Chemistry LaboratoryUniversity of OxfordSouth Parks RoadOxford OX13QZUK

The emerging of single-atom catalysts(SACs)offers a great opportunity for the development of advanced energy storage and conversion devices due to their excellent activity and durability,but the actual mass production of high-loading SACs is still ***,a facile and green boron acid(H_(3)BO_(3))-assisted pyrolysis strategy is put forward to synthesize SACs by only using chitosan,cobalt salt and H_(3)BO_(3)as precursor,and the effect of H_(3)BO_(3)is deeply *** results show that molten boron oxide derived from H_(3)BO_(3)as ideal high-temperature carbonization media and blocking media play important role in the synthesis *** a result,the acquired Co/N/B tri-doped porous carbon framework(Co-N-B-C)not only presents hierarchical porous structure,large specific surface area and abundant carbon edges but also possesses high-loading single Co atom(4.2 wt.%),thus giving rise to outstanding oxygen catalytic *** employed as a catalyst for air cathode in Zn-air batteries,the resultant Co-N-B-C catalyst shows remarkable power density and long-term ***,our work gains deep insight into the role of H_(3)BO_(3)and provides a new avenue to synthesis of high-performance SACs.

关键词： boric acid oxygen reduction reaction single-atom catalysts Zn-air batteries

Toward batch synthesis of high-quality graphene by cold-wall chemical vapor deposition approach

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Nano Research 2022年第11期15卷 9683-9688页

作者： Kaicheng Jia Ziteng Ma Wendong Wang Yongliang Wen Huanxin Li Yeshu Zhu Jiawei Yang Yuqing Song Jiaxin Shao Xiaoting Liu Qi Lu Yixuan Zhao Jianbo Yin Luzhao Sun Hailin Peng jincan zhang Li Lin 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 Beijing 100095China School of Physics and Astronomy University of ManchesterManchester M139PLUK State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Engineering University of CambridgeCambridge CB30FAUK Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Key Laboratory of Opto-Electronics Technology Ministry of EducationCollege of Electronic Science and TechnologyFaculty of Information TechnologyBeijing University of TechnologyBeijing 100024China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Chemical vapor deposition(CVD)has emerged as a promising approach for the controlled growth of graphene films with appealing scalability,controllability,and ***,the synthesis of high-quality graphene films still suffers from low production capacity and high energy consumption in the conventional hot-wall CVD *** contrast,owing to the different heating mode,cold-wall CVD(CW-CVD)system exhibits promising potential for the industrial-scale production,but the quality of as-received graphene remains inferior with limited domain size and high defect ***,we demonstrated an efficient method for the batch synthesis of high-quality graphene films with millimeter-sized domains based on CW-CVD *** reduced defect density and improved properties,the as-received graphene was proven to be promising candidate material for electronics and anti-corrosion *** study provides a new insight into the quality improvement of graphene derived from CW-CVD system,and paves a new avenue for the industrial production of high-quality graphene films for potential commercial applications.

关键词： graphene cold-wall chemical vapor deposition(CVD) defects electrical performance

分数阶傅里叶变换在水下多目标方位估计中的应用研究

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信号处理 2020年第7期36卷 1175-1183页

作者：王大宇张锦灿中国电子科技集团公司第五十四研究所河北石家庄050081

线性调频(Linear Frequency Modulation,LFM)信号作为一种具有大时宽带宽积的信号被广泛应用于主动声纳中以进行水下目标方位估计。分数阶傅里叶变换(Fractional Fourier Transform,FRFT)技术对LFM信号分析具有独特的优势,本文通过对FRF... 详细信息

线性调频(Linear Frequency Modulation,LFM)信号作为一种具有大时宽带宽积的信号被广泛应用于主动声纳中以进行水下目标方位估计。分数阶傅里叶变换(Fractional Fourier Transform,FRFT)技术对LFM信号分析具有独特的优势,本文通过对FRFT的理论研究,分析其应用于水下多目标方位估计领域的可行性。对于FRFT最优阶次搜索中存在的误差影响,本文研究范数约束Capon波束形成技术(Norm Constrained Capon Beamforming,NCCB),利用NCCB算法提高FRFT预处理后的目标方位估计的稳健性。最后,本文将分数阶预处理与稳健波束形成算法结合,通过计算机仿真验证了基于FRFT预处理的NCCB算法在低信噪比环境下仍然可以实现水下多目标方位的稳健估计。

关键词：水下多目标方位估计分数阶傅里叶变换范数约束Capon波束形成