石墨烯基吸附剂的特性、吸附原理、改性复合及 研究方法

石墨烯具有独特的结构和优异性能,适合用作水处理吸附材料。介绍了与吸附相关的石墨烯的结构及特性,石墨烯基材料对不同污染物的吸附原理;基于石墨烯的性质和结构特点,对石墨烯基材料的改性、复合方法及其研究方法作了较详细论述。鉴于石墨烯基材料再生性能的重要性,对磁性石墨烯及三维石墨烯吸附材料作了简单介绍,最后对石墨烯基吸附剂研究的发展方向作了展望。     

石墨烯制备的方法、特性及基本原理

石墨烯具有独特的结构和优异的物理、化学性质,石墨烯材料的研究已成为相关研究领域的前沿和热点。石墨烯的质量、产量及应用与石墨烯的制备方法密切相关,当前石墨烯研究的最大瓶颈是石墨烯的大批量及高质量制备不能两者兼顾,其根源在于对各制备方法的基本原理还欠深入研究。介绍了石墨烯的各种制备方法及其相关的基本原理和特性,着重介绍了制备过程中石墨烯分离、形核和生长、还原的基本过程、步骤和机理,并展望了今后石墨烯制备的基本原理及相关研究的前景和发展趋势。     

石墨烯导热材料研究进展

石墨烯作为一种具有超高热导率的二维纳米材料,在导热领域有着广阔的应用前景.本文综述了石墨烯导热材料的研究进展,介绍了石墨烯本征热导率及其层数、缺陷、边缘情况等对热导率的影响,分析了石墨烯纤维的研究现状及存在的问题,讨论了各类石墨烯导热薄膜(纯石墨烯薄膜/石墨烯杂化薄膜/石墨烯聚合物复合薄膜)热导率的影响因素,归纳总结了各类三维石墨烯导热材料(无规分散石墨烯三维复合材料和特定结构石墨烯三维复合材料)的结构、性能与研究现状,最后指出了目前几种导热材料研究存在的问题并展望了石墨烯未来导热领域的发展方向,尤其是在LED照明、智能手机等高功率、高度集成系统中,石墨烯导热材料有着良好的发展前景.     

石墨烯及其复合材料作为锂离子电池负极材料的研究进展

石墨烯作为一种锂离子电池负极材料表现出优异的电化学性能。本文介绍了石墨烯负极材料、金属/石墨烯复合材料、金属氧化物/石墨烯复合材料和其他石墨烯复合材料的研究现状,阐述了石墨烯作为负极材料的优越性,展望了石墨烯及其复合复合材料在锂离子电池负极材料中的应用前景。     

石墨烯均匀分散问题研究进展

具有优良性能的石墨烯常被作为增强体加入基体材料中以改进其性能。研究发现,石墨烯增强复合材料的性质在很大程度上取决于石墨烯在基体中的均匀分散程度。而石墨烯增强体在基体中的均匀分散问题一直是研究的难点,这就限制了石墨烯增强复合材料性能的提升及其开发应用。总结了石墨烯在基体中均匀分散方法的研究进展,并展望了其研究方向及发展趋势。     

电化学法制备石墨烯和石墨烯/离子液体复合材料研究进展

石墨烯具有独特的二维结构和优异的光学、电学、力学等性能,一直是纳米材料领域的研究热点之一。石墨烯及其复合材料在超级电容器、锂离子电池、太阳能电池等电化学领域有着诱人的应用前景,高质量、高导电性能石墨烯的制备是石墨烯实际应用的关键问题之一。简述了石墨烯常用制备方法,并着重介绍了电化学法制备石墨烯以及石墨烯/离子液体复合材料,并且对石墨烯研究领域的发展趋势进行了总结和展望。     

石墨烯在传感器中的应用研究进展

随着石墨烯材料的发展,传感器的发展也如虎添翼。很多优异传感器的诞生也使生产生活变得更加智能可控。基于石墨烯材料论述了石墨烯电化学传感器和生物传感器的研究进展,包括石墨烯气敏传感器、石墨烯生物小分子传感器、石墨烯酶传感器、石墨烯医药传感器、石墨烯离子传感器、石墨烯湿度传感器、石墨烯应力应变传感器。最后展望了基于石墨烯光学性能、高热导性能、力学性能和室温铁磁效应等性能的传感器研究。     

石墨烯复合材料的研究进展

石墨烯以其优异的性能和独特的二维结构成为材料领域研究热点。本文综述了石墨烯的制备方法并分析比较了各种方法的优缺点, 简单介绍了石墨烯的力学、光学、电学及热学性能。基于石墨烯的复合材料是石墨烯应用领域中的重要研究方向, 本文详细介绍了石墨烯聚合物复合材料和石墨烯基无机纳米复合材料的制备及应用, 并特别讨论了石墨烯/块体金属基复合材料的制备方法和其优异性能。     

石墨烯导热纸研究进展

由于依靠声子进行热传导的特性,石墨烯具有异乎寻常的高热导率。理论和实验研究均已证明,单层石墨烯的热导率可达5 000 W·m^-1·K^-1以上,是目前已知热导率最高的一种材料。然而,单层石墨烯由于厚度薄、片径小等几何尺寸上的原因而很难在宏观尺度上获得实际应用。得益于化学方法制备高质量石墨烯粉体的快速发展,将石墨烯粉体制备成柔性的高导热石墨烯纸是近几年的热点研究方向之一。虽然石墨烯纸的面内热导率已经能够达到1 000 W·m^-1·K^-1以上,但与单层石墨烯的热导率仍存在较大的差距,且纵向热导率低。近几年,科研人员从大尺寸石墨烯粉体的采用、石墨烯纸微观结构的优化、还原处理方法的改进、石墨烯与其他物质混合等方面进行了研究,在提高石墨烯纸的热导率上取得了比较显著的效果。本文综述了有关石墨烯纸的研究进展,介绍了石墨烯纸的制备方法,并分析影响石墨烯纸热导率的因素,讨论增强石墨烯纸热导率的方法,总结了提高石墨烯纸热导率的研究思路和发展趋势,最后展望了石墨烯纸在热管理领域的应用。     

石墨烯增强金属基复合材料的研究进展

石墨烯由于独特的结构和优异的性能已成为金属基复合材料中最具吸引力的碳质材料增强体。综述了近年来石墨烯增强金属基复合材料的研究进展、强化机制及石墨烯表面改性进展,分析了石墨烯增强金属基复合材料研究存在的问题,并对石墨烯增强金属基复合材料的研究方向及发展趋势进行了展望。     

Aspects of the theory of graphene

Following a brief review of the device-friendly features of graphene, recent work on its Green's functions with and without a normal magnetic field are discussed, for an infinite graphene sheet and also for a quantum dot, with analyses of the Landau-quantized energy spectra of the sheet and dot. The random phase approximation dielectric response of graphene is reviewed and discussed in connection with the van der Waals interactions of a graphene sheet with atoms/molecules and with a second graphene sheet in a double layer. Energy-loss spectroscopy for a graphene sheet subject to both parallel and perpendicular particle probes of its dynamic, non-local response properties are also treated. Furthermore, we discuss recent work on the coupling of a graphene plasmon and a surface plasmon, yielding a collective plasma mode that is linear in wavenumber. Finally, we discuss the unusual aspects of graphene conduction and recent work on diffusive charge transport in graphene, in both the DC and AC regimes.     

石墨烯的应用进展

石墨烯由于其独特的物理和化学性质,在各领域得到了广泛应用。文章阐述了石墨烯在能源通讯和医药等不同领域中的应用进展,并提出石墨烯在未来可能的应用方向,对功能化石墨烯的研究具有指导作用。     

石墨烯的制备方法及其应用特性

近3年来,石墨烯以其独特的结构和优异的性能,在化学、物理和材料学界引起了轰动。引用大量最新的参考文献,介绍了石墨烯的研究现状,通过评述石墨烯的合成、功能化以及近期应用概况,展望了石墨烯的发展前景和研究方向,认为借鉴各种方法的优势,综合运用,可以制备单层、结构完整和高电导率的石墨烯,并进一步将其功能化,拓展其应用领域并已取得较大的进展,这一途径被认为是石墨烯规模化应用的战略起点。     

聚合物基石墨烯纳米复合材料的研究进展

综述了聚合物基石墨烯及改性石墨烯纳米复合材料的研究进展.添加少量的石墨烯就可以显著提聚合物材料的各方面性能,因此,近年来石墨烯得到了学术界和工业界的高度关注,石墨烯、氧化石墨烯的改性,以及聚合物基石墨烯纳米复合材料被广泛研究.通过广泛的文献阅读对聚合物基石墨烯纳米复合材料的结构、制备方法以及性能进行了深入探讨.     

Recent Advances of Porous Graphene: Synthesis,Functionalization, and Electrochemical Applications

Graphene is a 2D sheet of sp² bonded carbon atoms and tends to aggregate together, due to the strong π–π stacking and van der Waals attraction between different layers. Its unique properties such as a high specific surface area and a fast mass transport rate are severely blocked. To address these issues, various kinds of 2D holey graphene and 3D porous graphene are either self‐assembled from graphene layers or fabricated using graphene related materials such as graphene oxide and reduced graphene oxide. Porous graphene not only possesses unique pore structures, but also introduces abundant exposed edges and accelerates mass transfer. The properties and applications of these porous graphenes and their composites/hybrids have been extensively studied in recent years. Herein, recent progress and achievements in synthesis and functionalization of various 2D holey graphene and 3D porous graphene are reviewed. Of special interest, electrochemical applications of porous graphene and its hybrids in the fields of electrochemical sensing, electrocatalysis, and electrochemical energy storage, are highlighted. As the closing remarks, the challenges and opportunities for the future research of porous graphene and its composites are discussed and outlined.     

MPCVD法制备石墨烯的研究进展

微波等离子体化学气相沉积（MPCVD）法是近年来发展起来的制备石墨烯的新方法,具有低温生长、基底材料选择广泛、容易掺杂等优点,逐渐成为制备高质量石墨烯的主要方法。首先通过分析制备石墨烯的几种主要方法（微机械剥离法、sic外延生长法、化学剥离法、化学气相沉积法）得出MPCVD法相对于其他方法的优势,然后综述了MPCVD法制备石墨烯的研究进展,最后简要列举了MPCVD法制备的石墨烯的应用并对MPCVD法制备石墨烯的发展趋势进行了展望。     

Graphene Single Crystals: Size and Morphology Engineering

Recently developed chemical vapor deposition (CVD) is considered as an effective way to large‐area and high‐quality graphene preparation due to its ultra‐low cost, high controllability, and high scalability. However, CVD‐grown graphene film is polycrystalline, and composed of numerous grains separated by grain boundaries, which are detrimental to graphene‐based electronics. Intensive investigations have been inspired on the controlled growth of graphene single crystals with the absence of intrinsic defects. As the two most concerned parameters, the size and morphology serve critical roles in affecting properties and understanding the growth mechanism of graphene crystals. Therefore, a precise tuning of the size and morphology will be of great significance in scale‐up graphene production and wide applications. Here, recent advances in the synthesis of graphene single crystals on both metals and dielectric substrates by the CVD method are discussed. The review mainly covers the size and morphology engineering of graphene single crystals. Furthermore, recent progress in the growth mechanism and device applications of graphene single crystals are presented. Finally, the opportunities and challenges are discussed.     

Graphene on Group‐IV Elementary Semiconductors: The Direct Growth Approach and Its Applications

Since the first development of large‐area graphene synthesis by the chemical vapor deposition (CVD) method in 2009, CVD‐graphene has been considered to be a key material in the future electronics, energy, and display industries, which require transparent, flexible, and stretchable characteristics. Although many graphene‐based prototype applications have been demonstrated, several important issues must be addressed in order for them to be compatible with current complementary metal‐oxide‐semiconductor (CMOS)‐based manufacturing processes. In particular, metal contamination and mechanical damage, caused by the metal catalyst for graphene growth, are known to cause severe and irreversible deterioration in the performance of devices. The most effective way to solve the problems is to grow the graphene directly on the semiconductor substrate. Herein, recent advances in the direct growth of graphene on group‐IV semiconductors are reviewed, focusing mainly on the growth mechanism and initial growth behavior when graphene is synthesized on Si and Ge. Furthermore, recent progress in the device applications of graphene with Si and Ge are presented. Finally, perspectives for future research in graphene with a semiconductor are discussed.     

Bibliometric trend analysis on global graphene research

Graphene is a rising star as one of the promising materials with many applications. Its global literature increased fast in recent years. In this work, bibliometric analysis and knowledge visualization technology were applied to evaluate global scientific production and developing trend of graphene research. The data were collected from 1991 to 2010 from the Science Citation Index database, Conference Proceeding Citation Index database and Derwent Innovation Index database integrated by Thomson Reuters. The published papers from different subjects, journals, authors, countries and keywords distributed in several aspects of research topics proved that graphene research increased rapidly over past 20 years and boosted in recent 5 years. The distinctions in knowledge map show that the clusters distributed regularly in keywords of applied patents in recent 5 years due to the potential applications of graphene research gradually found. The analytical results provided several key findings of bibliometrics trend.     

Direct comparison between experiments and computations at the atomic length scale: a case study of graphene

This paper discusses a set of recent experimental results in which the mechanical properties of monolayer graphene molecules were determined. The results included the second-order elastic modulus which determines the linear elastic behavior and an estimate of the third-order elastic modulus which determines the non-linear elastic behavior. In addition, the distribution of the breaking force strongly suggested the graphene to be free of defects, so the measured breaking strength of the films represented the intrinsic breaking strength of the underlying carbon covalent bonds. The results of recent simulation efforts to predict the mechanical properties of graphene are discussed in light of the experiments. Finally, this paper contains a discussion of some of the extra challenges associated with experimental validation of multi-scale models.