The physics and chemistry of graphene-on-surfaces

Zhao, Guoke; Li, Xinming; Huang, Mei‐Rong; Zhen, Zhen; Zhong, Yanqiang; Qiao, Chen; Zhao, Xuanliang; He, Yijia; Hu, Ruirui; Yang, Tingting; Zhang, Rujing; Li, Changli; Kong, Jing; Xu, Jianbin; Ruoff, Rodney S.; Zhu, Hongwei

doi:10.1039/c7cs00256d

Cited by 333 publications

(169 citation statements)

References 446 publications

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“…The distance between adjacent carbon atoms in the same layer is 0.142 nm. The distance between adjacent graphite layers in graphite is 0.335 nm; the dominating interaction force between layers is van der Waals force …”

Section: Classification Of 2d Crystalsmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

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2D crystals are emerging new materials in multidisciplinary fields including condensed state physics, electronics, energy, environmental engineering, and biomedicine. To employ 2D crystals for practical applications, these nanoscale crystals need to be processed into macroscale materials, such as suspensions, fibers, films, and 3D macrostructures. Among these macromaterials, fibers are flexible, knittable, and easy to use, which can fully reflect the advantages of the structure and properties of 2D crystals. Therefore, the fabrication and application of 2D crystal–based fibers is of great importance for expanding the impact of 2D crystals. In this Review, 2D crystals that are successfully prepared are overviewed based on their composition of elements. Subsequently, methods for preparing 2D crystals, 2D crystals dispersions, and 2D crystal–based fibers are systematically introduced. Then, the applications of 2D crystal–based fibers, such as flexible electronic devices, high‐efficiency catalysis, and adsorption, are also discussed. Finally, the status‐of‐quo, perspectives, and future challenges of 2D crystal–based fibers are summarized. This Review provides directions and guidelines for developing new 2D crystal–based fibers and exploring their potentials in the fields of smart wearable devices.

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Section: Classification Of 2d Crystalsmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

Small

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“…The result shows that 54% of carbon in GO QDs was successfully oxidized, forming CO or CO bonds, with the www.advmatinterfaces.de corresponding peaks located at 286.38 and 288.27 eV, respectively. [36] The obvious D band in the Raman spectrum of GO QDs is attributed to the rich oxygen-containing functional groups and the high edge-to-volume ratio of GO QDs. Characteristic peaks located at 1060 and 1633 cm −1 are ascribed to CO stretching and CC stretching, respectively.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 99%

Physically Coating Nanofiltration Membranes with Graphene Oxide Quantum Dots for Simultaneously Improved Water Permeability and Salt/Dye Rejection

Zhao

et al. 2019

Adv Materials Inter

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strategy to produce fresh water from seawater and polluted water, without generating harmful by-products. [3] Among them, thin-film composite nanofiltration (TFC NF) membranes are an important component. They can produce higher water flux with lower energy consumption compared with reverse osmosis membranes. They are efficient in removal of both conventional and emerging contaminants from water. In addition, the higher rejection of divalent ions compared with monovalent ones makes them promising in the application of water softening. [4][5][6] Generally TFC NF membranes are prepared through the interfacial polymerization (IP) method, forming a structure of an ultrathin polyamide (PA) selective layer on the surface of a porous substrate. The structure and physiochemical properties of the PA selective layer and the underlying substrate can be individually modified to improve the overall membrane performance. [7] However, the trade-off between water permeability and salt rejection, a so-called "upper bound" relation, is one of the key problems faced by TFC membranes. [8][9][10] It is highly desirable that we can fabricate TFC PA NF membranes with improved water permeability and salt/dye rejection for promoting both energy effectiveness and water quality.Incorporating hydrophilic nanoparticles (NPs), such as TiO 2 , [11] SiO 2 , [12,13] Al 2 O 3 , [14] Ag, [15] nanozeolite, [16,17] and graphene oxide quantum dots (GO QDs), [18] into the top PA selective layer to form thin-film nanocomposite (TFN) membranes has been demonstrated as an effective strategy to improve the water permeability of membranes. The improvement is resulted from the increased membrane hydrophilicity and additional water pathways introduced by the NPs. However, NPs tend to interfere the IP process of the PA selective layer, leading to undesired changes in pore structure, thickness, and surface roughness of membranes. [19,20] Besides, the incompatibility between inorganic NPs and the organic polymer matrix results in microporous defects. [21,22] Both of them account for the decrease in membrane salt rejection. Additionally, NPs are mainly embedded inside the polymer matrix, so that they are not effectively available for surface-based interactions.A physically bound coating of graphene oxide quantum dots (GO QDs) on thin-film composite polyamide nanofiltration (NF) membranes is prepared through a pressure-assisted filtration method to simultaneously improve the membranes' water permeability and salt/dye rejection. It is the first attempt to use carbon-based nanoparticles as surface coating to improve the efficiency of water filtration membranes. Influences of the GO QDs' coating on the hydrophilicity and surface charge of the membranes are investigated by water contact angle and zeta potential measurements. With the GO QDs' coating, the surface roughness and hydrophilicity of the membranes increase, and the membrane surface becomes more negatively charged. Water permeability and salt/dye rejection of GO QD-coated NF membranes increase simultaneously ...

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“…Graphene was discovered in 2004 by physicists Andre Geim and Konstantin Novoselov [6]. Graphene is a new type of carbon nanomaterial with a hexagonal honeycomb structure composed of single-layer carbon atoms.…”

Section: Introductionmentioning

confidence: 99%

“…The thickness of monolayer graphene is only 0.335 nm, which is the thinnest nanomaterial in the world [7]. Its mechanical strength, thermal conductivity, conductivity, and other properties are excellent [6,8]. Two-dimensional materials, such as boron nitride (BN) and molybdenum disulfide (MoS 2 ), were also discovered subsequently [9].…”

Section: Introductionmentioning

confidence: 99%

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

Liu

Zhou

Xiao³

et al. 2018

Materials

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Two-dimensional (2D) materials are ultra-thin crystals with layered structures that have a monolayer and multiple layers of atomic thickness. Due to excellent performance, 2D materials represented by graphene have caused great interest from researchers in various fields, such as nano-electronics, sensors, solar cells, composite materials, and so on. In recent years, when graphite was used for liquid phase lubrication, there have been many disadvantages limiting its lubrication properties, such as stable dispersion, fluidity and so on. Therefore, 2D materials have been used as high-performance liquid-phase lubricant additives, which become a perfect entry point for high-performance nano-lubricants and lubrication applications. This review describes the application of 2D materials as additives in the field of liquid-phase lubrication (such as lubricating oil and water lubrication) in terms of experimental content, lubrication performance, and lubrication mechanism. Finally, the challenges and prospects of 2D materials in the lubrication field were also proposed.

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The physics and chemistry of graphene-on-surfaces

Cited by 333 publications

References 446 publications

2D Crystal–Based Fibers: Status and Challenges

2D Crystal–Based Fibers: Status and Challenges

Physically Coating Nanofiltration Membranes with Graphene Oxide Quantum Dots for Simultaneously Improved Water Permeability and Salt/Dye Rejection

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

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