scholarly journals Controllable fabrication of ultrathin free-standing graphene films

2014 ◽  
Vol 372 (2013) ◽  
pp. 20130017 ◽  
Author(s):  
Jianyi Chen ◽  
Yunlong Guo ◽  
Liping Huang ◽  
Yunzhou Xue ◽  
Dechao Geng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ultrathin Films ◽  
Low Cost ◽  
Free Standing ◽  
Assembly Method ◽  
Graphene Films ◽  
Real World Applications ◽  
Optical And Mechanical Properties ◽  
Controllable Fabrication ◽  
Made In

Graphene free-standing film-like or paper-like materials have attracted great attention due to their intriguing electronic, optical and mechanical properties and potential application in chemical filters, molecular storage and supercapacitors. Although significant progress has been made in fabricating graphene films or paper, there is still no effective method targeting ultrathin free-standing graphene films (UFGFs). Here, we present a modified filtration assembly method to prepare these ultrathin films. With this approach, we have fabricated a series of ultrathin free-standing graphene oxide films and UFGFs, up to 40 mm in diameter, with controllable thickness from micrometre to nanoscale (approx. 40 nm) dimensions. This method can be easily scaled up and the films display excellent optical, electrical and electrochemical properties. The ability to produce UFGFs from graphene oxide with a scalable, low-cost approach should take us a step closer to real-world applications of graphene.

scholarly journals Facile synthesis of lignosulfonate-graphene porous hydrogel for effective removal of Cr(VI) from aqueous solution

BioResources ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 7001-7014
Author(s):  
Zhili Zhang ◽  
Fengfeng Li ◽  
Xingxiang Ji ◽  
Jiachuan Chen ◽  
Guihua Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Self Assembly ◽  
Free Standing ◽  
Environmental Friendliness ◽  
Surface Areas ◽  
Assembly Method ◽  
Effective Removal ◽  
The Cost ◽  
Adsorption Desorption ◽  
Porous Hydrogel

A green and facile fabrication strategy for synthesis of lignosulfonate-graphene porous hydrogel (LGPH) was designed via incorporation of lignosulfonate (LS) into graphene oxide (GO). This process was achieved by a simple self-assembly method at low temperature, with LS serving as surface functionalization agent. Benefiting from the abundant functional groups of LS and the large surface areas of graphene oxide, the prepared LGPH hydrogel displayed 3D interconnected pores and exhibited an excellent adsorption capacity for Cr(VI) (601.2 mg/g) ions dissolved in water. Importantly, the free-standing LGPH was easily separated from water after the adsorption process, and the adsorption capacities of Cr(VI) onto LGPH maintained 439.1 mg/g after 5 adsorption-desorption cycles. The cost-effectiveness and environmental friendliness of LGPH make it a promising material for removing heavy metals from wastewater.

Versatile self-assembled graphene oxide membranes obtained under ambient conditions by using a water–ethanol suspension

2017 ◽  
Vol 5 (5) ◽  
pp. 2132-2142 ◽  
Author(s):  
Liviu Cosmin Cotet ◽  
Klára Magyari ◽  
Milica Todea ◽  
Mircea Cristian Dudescu ◽  
Virginia Danciu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Self Assembly ◽  
Low Cost ◽  
Assembly Process ◽  
Ambient Conditions ◽  
Free Standing ◽  
Air Liquid Interface ◽  
Oxide Membranes ◽  
Ethanol Fraction ◽  
Graphene Oxide Membranes

The study reports a low cost and scalable pathway for preparing free-standing GO membranes by a self-assembly process under ambient conditions at an air–liquid interface of an isopycnic sorted GO water–ethanol fraction.

Synthesis of free-standing reduced graphene oxide membranes with different thicknesses and comparison of their electrochemical performance as anodes for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 30084-30091 ◽  
Author(s):  
Jinxing Wang ◽  
Hui Wang
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Low Cost ◽  
Lithium Ion ◽  
Free Standing ◽  
Step Process ◽  
Reduced Graphene ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

Free-standing reduced graphene oxide membranes (rGOMs) with different thicknesses and carbon contents are prepared via a simple, low cost, scalable, and eco-friendly two-step process.

Graphene Oxide and Its Derivatives: Their Synthesis and Use in Organic Synthesis

2019 ◽  
Vol 23 (2) ◽  
pp. 188-204 ◽  
Author(s):  
Xiangjun Peng ◽  
Xianyun Xu ◽  
Fujiang Huang ◽  
Qian Liu ◽  
Liangxian Liu
Keyword(s):  
Graphene Oxide ◽  
Carbon Materials ◽  
Device Fabrication ◽  
Organic Reactions ◽  
Bond Forming ◽  
Bond Forming Reactions ◽  
Modern Physics ◽  
Recent Developments ◽  
Optical And Mechanical Properties ◽  
Nitrogen Double Bond

Since Geim and co-workers reported their groundbreaking experiments on graphene, research on graphene oxide (GO) and its derivatives has greatly influenced the field of modern physics, chemistry, device fabrication, material science, and nanotechnology. The unique structure and fascinating properties of these carbon materials can be ascribed to their eminent chemical, electronic, electrochemical, optical, and mechanical properties of GO and its derivatives, particularly compared to other carbon allotropes. The present Review aims to provide an overview on the recent developments in the preparation of GO and its derivatives and their applications in organic reactions. We will first outline the synthesis of GO and its derivatives. Then, we will discuss the major sections about their application as stoichiometric and catalytic oxidants in organic reactions, a particular emphasis on the carbon-carbon, carbon-oxygen, and carbon-nitrogen single bond-forming reactions, as well as carbon-oxygen and carbon-nitrogen double bond-forming reactions. Simultaneously, this Review also describes briefly transition metal supported on GO or its derivatives as a catalyst for organic reaction. Lastly, we will present an outlook of potential areas where GO and its derivatives may be expected to find utility or opportunity for further growth and study.

scholarly journals Photocatalytic reduction of graphene oxide with cuprous oxide film under UV-vis irradiation

2020 ◽  
Vol 59 (1) ◽  
pp. 207-214 ◽  
Author(s):  
Yao Wang ◽  
Jianqing Feng ◽  
Lihua Jin ◽  
Chengshan Li
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Photocatalytic Reduction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene ◽  
Reduction Efficiency ◽  
Metal Organic ◽  
Reduction Effect

AbstractWe have grown Cu2O films by different routes including self-oxidation and metal-organic deposition (MOD). The reduction efficiency of Cu2O films on graphene oxide (GO) synthesized by modified Hummer’s method has been studied. Surface morphology and chemical state of as-prepared Cu2O film and GO sheets reduced at different conditions have also been investigated using atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Results show that self-oxidation Cu2O film is more effective on phtocatalytic reduction of GO than MOD-Cu2O film. Moreover, reduction effect of self-oxidation Cu2O film to GO is comparable to that of environmental-friendly reducing agent of vitamin C. The present results offer a potentially eco-friendly and low-cost approach for the manufacture of reduced graphene oxide (RGO) by photocatalytic reduction.

scholarly journals Free-standing reduced graphene oxide (rGO) membrane for salt-rejecting solar desalination via size effect

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4601-4608 ◽  
Author(s):  
Pengyu Zhuang ◽  
Hanyu Fu ◽  
Ning Xu ◽  
Bo Li ◽  
Jun Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Conversion Efficiency ◽  
High Salinity ◽  
Interlayer Spacing ◽  
Structural Instability ◽  
Solar Thermal ◽  
Free Standing ◽  
Solar Desalination ◽  
Reduced Graphene

AbstractInterfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m−2 h−1 (solar–thermal conversion efficiency ∼79%) under one sun, out of 3.5 wt% brine. More strikingly, due to the tailored narrow interlayer spacing, the rGO membrane can effectively reject ions, preventing salt accumulation even for high salinity brine (∼8 wt% concentration). With enabled salt-antifouling capability, flexibility, as well as stability, our rGO membrane serves as a promising solar evaporator for high salinity brine treatment.

Metal-organic framework derived metal oxide/reduced graphene oxide nanocomposite, a new tool for the determination of dipyridamole

2021 ◽  
Author(s):  
Naeime Salandari-Jolge ◽  
Ali A. Ensafi ◽  
Behzad Rezaei
Keyword(s):  
Myocardial Infarction ◽  
Graphene Oxide ◽  
High Performance ◽  
High Selectivity ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Heart Patients ◽  
Reduced Graphene ◽  
Metal Organic

Dipyridamole is a prescribed medication used to treat cardiovascular diseases, angina pectoris, imaging tests for heart patients, and myocardial infarction. Therefore, high selectivity and sensitivity, low cost, and high-performance speed...

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