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| 1 | Graphene transfer methods: A review显示文摘Graphene is a material with unique properties that can be exploited in electronics, catalysis, energy, and bio-related fields. Although, for maximal utilization of this material, high-quality graphene is required at both the growth process and after transfer of the graphene film to the application-compatible substrate. Chemical vapor deposition (CVD) is an important method for growing high-quality graphene on non-technological substrates (as, metal substrates, e.g., copper foil). Thus, there are also considerable efforts toward the efficient and non-damaging transfer of quality of graphene on to technologically relevant materials and systems. In this review article, a range of graphene current transfer techniques are reviewed from the standpoint of their impact on contamination control and structural integrity preservation of the as-produced graphene. In addition, their scalability, cost- and time-effectiveness are discussed. We summarize with a perspective on the transfer challenges, alternative options and future developments toward graphene technology. | Sami Ullah Xiaoqin Yang Huy Q.Ta Maria Hasan Alicja Bachmatiuk Klaudia Tokarska Barbara Trzebicka Lei Fu Mark H.Rummeli | 2021 | Nano Research2021，14，11： | 3 |
| 2 | In-situ observations of novel single-atom thick 2D tin membranes embedded in graphene显示文摘There is ongoing research in freestanding single-atom thick elemental metal patches,including those suspended in a two-dimensional(2D)material,due to their utility in providing new structural and energetic insight into novel metallic 2D systems.Graphene pores have shown promise as support systems for suspending such patches.This study explores the potential of Sn atoms to form freestanding stanene and/or Sn patches in graphene pores.Sn atoms were deposited on graphene,where they formed novel single-atom thick 2D planar clusters/patches(or membranes)ranging from 1 to 8 atoms within the graphene pores.Patches of three or more atoms adopted either a star-like or close-packed structural configuration.Density functional theory(DFT)calculations were conducted to look at the cluster configurations and energetics(without the graphene matrix)and were found to deviate from experimental observations for 2D patches larger than five atoms.This was attributed to interfacial interactions between the graphene pore edges and Sn atoms.The presented findings help advance the development of single-atom thick 2D elemental metal membranes. | Xiaoqin Yang Huy Q.Ta Wei Li Rafael G.Mendes Yu Liu Qitao Shi Sami Ullah Alicja Bachmatiuk Jinping Luo Lijun Liu Jin-Ho Choi Mark H.Rummeli | 2021 | Nano Research2021，14，3： | 0 |
| 3 | Copper acetate-facilitated transfer-free growth of high-quality graphene for hydrovoltaic generators显示文摘Direct synthesis of high-quality graphene on dielectric substrates without a transfer process is of vital importance for a variety of applications.Current strategies for boosting high-quality graphene growth,such as remote metal catalyzation,are limited by poor performance with respect to the release of metal catalysts and hence suffer from a problem with metal residues.Herein,we report an effective approach that utilizes a metal-containing species,copper acetate,to continuously supply copper clusters in a gaseous form to aid transfer-free growth of graphene over a wafer scale.The thus-derived graphene films were found to show reduced multilayer density and improved electrical performance and exhibited a carrier mobility of 8500 cm^(2) V^(−1) s^(−1).Furthermore,droplet-based hydrovoltaic electricity generator devices based on directly grown graphene were found to exhibit robust voltage output and long cyclic stability,in stark contrast to their counterparts based on transferred graphene,demonstrating the potential for emerging energy harvesting applications.The work presented here offers a promising solution to organize the metal catalytic booster toward transfer-free synthesis of high-quality graphene and enable smart energy generation. | Jingyuan Shan Sunmiao Fang Wendong Wang Wen Zhao Rui Zhang Bingzhi Liu Li Lin Bei Jiang Haina Ci Ruojuan Liu Wen Wang Xiaoqin Yang Wenyue Guo Mark H.Rummeli Wanlin Guo Jingyu Sun Zhongfan Liu | 2022 | National Science Review2022，9，7： | 0 |
| 4 | Biomass Template Derived Boron/Oxygen Co-Doped Carbon Particles as Advanced Anodes for Potassium-Ion Batteries显示文摘Among various anode candidates for potassium-ion batteries,carbonaceous materials have attracted significant attention due to their overwhelming advantages including cost-effectiveness and environmental benignity.However,the inferior specific capacity and the sluggish reaction kinetics hinder the further development in this realm.Herein,we report biomass templated synthesis of boron/oxygen heteroatom co-doped carbon particles(BO-CPs)via direct plasma-enhanced chemical vapor deposition.With the combined advantages of abundant active sites,large accessible surface area,and functional groups,BO-CP anode exhibits high reversible specific capacity(426.5 mAh g^(-1)at 0.1 A g^(-1))and excellent rate performance(166.5 mAh g^(-1)at 5 A g^(-1)).The K-ion storage mechanism is probed by operando Raman spectroscopy,ex situ X-ray photoelectron spectroscopy/electrochemical impedance spectroscopy,galvanostatic intermittent titration technique measurements,and theoretical simulations.The synergistic effect of boron and oxygen co-doping greatly facilitates the performance of carbon-based anode,wherein boron dopant improves the conductivity of carbon framework and the oxygen dopant affords ample active sites and thus harvests additional specific capacity.This work is anticipated to propel the development of high-performance anode materials for emerging energy storage devices. | Xueyu Lian Zhongti Sun Qingqing Mei Yuyang Yi Junhua Zhou Mark H.Rummeli Jingyu Sun | 2022 | Energy & Environmental Materials2022，5，1： | 0 |
| 5 | 石墨烯空心球的弹性缓冲效应助力高性能硅基锂离子电池显示文摘硅被认为是下一代锂离子电池极具潜力的负极材料.纳米硅的使用缓解了其在锂化时因体积变化引起的颗粒粉碎化.然而,团聚的硅颗粒间的相互挤压仍然会引起硅负极的迅速失效.为此,我们以弹性的石墨烯空心球为媒介在硅粒子之间引入机械缓冲空间,来灵活缓冲硅的体积变化,保持电极结构的稳定性.在锂化过程中,硅体积膨胀产生的应力通过压缩石墨烯空心球的内部空心得到了机械式的缓冲.除此之外,石墨烯空心球还减少了硅颗粒的局部团聚,有效地提高了整体电导率.基于这些优势,所设计的Si/GS电极在0.8 A g^(-1)的电流密度下循环200圈后性能仍维持在1200 mA hg^(-1)以上;在4 A g^(-1)的电流密度下,200次循环后仍可达到1025 mA h g^(-1). | 施启涛 叶伟彬 Kurtyka Klaudia 王海明 连雪玉 Quang Ta Huy 周军华 杨晓琴 郭伶俐 Trzebicka Barbara 孙靖宇 刘立军 王鸣生 H.Rummeli Mark | 2022 | Science China Materials2022，65，9： | 0 |
| 6 | Direct synthesis of large-area Al-doped graphene by chemical vapor deposition:Advancing the substitutionally doped graphene family显示文摘Graphene doping continues to gather momentum because it enables graphene properties to be tuned,thereby affording new properties to,improve the performance of,and expand the application potential of graphene.Graphene can be chemically doped using various methods such as surface functionalization,hybrid composites(e.g.,nanoparticle decoration),and substitution doping,wherein C atoms are replaced by foreign ones in the graphene lattice.Theoretical works have predicted that graphene could be substitutionally doped by aluminum(Al)atoms,which could hold promise for exciting applications,including hydrogen storage and evolution,and supercapacitors.Other theoretical predictions suggest that Al substitutionally doped graphene(AIG)could serve as a material for gas sensors and the catalytic decomposition of undesirable materials.However,fabricating Al substitutionally doped graphene has proven challenging until now.Herein,we demonstrate how controlled-flow chemical vapor deposition(CVD)implementing a simple solid precursor can yield high-quality and large-area monolayer AIG,and this synthesis is unequivocally confirmed using various characterization methods including local electron energy-loss spectroscopy(EELS).Detailed high-resolution transmission electron microscopy(HRTEM)shows numerous bonding configurations between the Al atoms and the graphene lattice,some of which are not theoretically predicted.Furthermore,the produced AIG shows a CO_(2) capturability superior to those of other substitutionally doped graphenes. | Sami Ullah Yu Liu Maria Hasan Wenwen Zeng Qitao Shi Xiaoqin Yang Lei Fu Huy Q.Ta Xueyu Lian Jingyu Sun Ruizhi Yang Lijun Liu Mark H.Rummeli | 2022 | Nano Research2022，15，2： | 0 |
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