The Preparation of Graphene via Thermal Reduction Method

2012 ◽  
Vol 557-559 ◽  
pp. 1539-1542
Author(s):  
Jian Fang Wang ◽  
Ya Nan Lv ◽  
Yin Long ◽  
Cheng An Tao ◽  
Hui Zhu
Keyword(s):  
Graphene Oxide ◽  
High Temperature ◽  
Smooth Surface ◽  
Reduction Method ◽  
Thermal Reduction ◽  
Thermal Reaction ◽  
Thermal Method ◽  
High Quality ◽  
Graphene Surface ◽  
Reduction Methods

In this paper, the graphene oxide reducing by photochemical-thermal reduction and high-temperature thermal reduction was studied to get qualified graphene and avoid the re-aggregation. The results show that graphene obtained by both of the two reduction methods all maintained the original well-layered morphology of the graphene oxide. The graphene had smooth surface and high quality as completely reduced by high-temperature thermal method. However, the reduction the photochemical-thermal reaction was not sufficient and caused many vesicles on the graphene surface due to the low temperature and the lack of reaction time.

Reduced Graphene Oxide Paper: Fabrication by a Green Thermal Reduction Method and Preliminary Study of its In Vitro Cytotoxicity

2017 ◽  
Vol 45 ◽  
pp. 199-207 ◽  
Author(s):  
Xin Wang ◽  
Peng Li ◽  
Claudia Luedecke ◽  
Qiang Zhang ◽  
Zan Wang ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Mammalian Cells ◽  
Reduction Method ◽  
Heating Temperature ◽  
Synthesis Method ◽  
Thermal Reduction ◽  
Graphene Films ◽  
Reduced Graphene

Graphene films have been intensively explored because of their unique mechanical and physicochemical properties for potential applications in field of tissue engineering and implants. However, for biomedical applications, it is necessary to fully understand the toxicity and biocompatibility of the prepared graphene films since different synthesis method might lead to different biological properties. Here we report a step-by-step thermal reduction method of preparing reduced graphene oxide (rGO) film directly on various substrates at low heating temperature (below about 200 °C) without requiring any chemical reduction agent like hydrazine or other reductants (therefore we call it green method). Slowly heating GO hydrosol that was coated on the surface of a glass cell-culture dish or inside of a polypropylene tube from room temperature to 60, 100, and 160 °C for 12 h, respectively, a shiny and flat surface without crumpled structure or tiny pores was formed. We peeled it off from the substrate to explore its cytotoxicity. The results exhibited that the rGO film was biocompatible with Cal-72 cell but against Escherichia coli bacteria. Our work confirmed that rGO film produced by the green reduction method is cytocompatible with mammalian cells, which makes this rGO film a promising material for tissue engineering scaffold or as a surface-modification coating of an implant.

scholarly journals Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

RSC Advances ◽  
2018 ◽  
Vol 8 (28) ◽  
pp. 15315-15325 ◽  
Author(s):  
Chenbo Liao ◽  
Xukun Zhu ◽  
Wei Xie ◽  
Fangmei Zeng ◽  
Shihe Yi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Absorption Band ◽  
Microwave Absorption ◽  
Reduction Method ◽  
Thermal Reduction ◽  
Wide Absorption Band ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
High Absorption

Reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method.

Facile synthesis of thermally reduced graphene oxide-sepiolite nanohybrid via intercalation and thermal reduction method

2017 ◽  
Vol 135 ◽  
pp. 510-515 ◽  
Author(s):  
M.R. Vengatesan ◽  
S. Singh ◽  
S. Stephen ◽  
K. Prasanna ◽  
C.W. Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduction Method ◽  
Thermal Reduction ◽  
Facile Synthesis ◽  
Reduced Graphene

The Effect of Different Reduction Methods on Conductivity of Reduced-Graphene Oxide (r-GO)

2015 ◽  
Vol 815 ◽  
pp. 216-220 ◽  
Author(s):  
Muhammad Mahyiddin Ramli ◽  
K.N. Hanim ◽  
M.R. Muda ◽  
Siti Salwa Mat Isa ◽  
M.F. Jamlos
Keyword(s):  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Thermal Treatment ◽  
Reduced Graphene Oxide ◽  
Electrical Resistance ◽  
Chemical Reduction ◽  
Thermal Reduction ◽  
Reduced Graphene ◽  
Reduction Methods ◽  
Chemically Reduced Graphene Oxide

Large quantity of graphene oxide (GO) was prepared by Modified Hummer’s method, in which graphite was treated with a mixture of sulphuric acid, potassium permanganate and hydrogen peroxide. A chemically reduced graphene oxide (r-GO) was prepared using sodium borohydride (NaBH4), followed by thermal treatment and thermal treatment of chemically reduce using NaBH4. The electrical resistance of r-GO was measured using Keithley sourcemeter. The results revealed that r-GO show lower resistance on thermal reduction which is 2.39 kΩ compared to chemical reduction and thermal of NaBH4reduction which is 2.18 MΩ and 3.16 kΩ respectively. It can be concluded that thermal reduction is the best method to produce high conductivity r-GO film.

A Synthesize Protocol for Graphene Nanosheets

2016 ◽  
Vol 880 ◽  
pp. 3-6
Author(s):  
Yu Qin Yao ◽  
Yin Jie Cen ◽  
Richard D. Sisson ◽  
Jian Yu Liang
Keyword(s):  
Graphite Oxide ◽  
Reduction Method ◽  
Graphene Nanosheets ◽  
Thermal Reduction ◽  
Wet Chemical Method ◽  
Thermal Methods ◽  
Reduction Methods ◽  
Yield Quality ◽  
Wet Chemical ◽  
Graphite Oxides

Chemical synthesis is cheap and easy to be tailored. Reduction of graphite oxide to form graphene nanosheets is a necessary step that determines yield, quality, chemical and surface properties of graphene nanosheets. In this report, the reduction of graphite oxides by chemical and thermal methods has been employed to convert graphite oxide synthesized by the same wet chemical method using KMnO4 and H2O2. The characterization results from the two reduction methods indicate that a combination of wet oxidation of graphite and thermal reduction method is an efficient and environmental friendly way to produce graphene.

scholarly journals Green Solid-State Chemical Reduction of Graphene Oxide Supported on a Paper Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 693
Author(s):  
Angela Longo ◽  
Mariano Palomba ◽  
Gianfranco Carotenuto
Keyword(s):  
Graphene Oxide ◽  
Solid State ◽  
Chemical Reduction ◽  
Low Cost ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Conversion Degree ◽  
Reduction Techniques ◽  
Reduction Methods ◽  
State Chemical

The reduction of graphene oxide (GO) thin films deposited on substrates is crucial to achieve a technologically useful supported graphene material. However, the well-known thermal reduction process cannot be used with thermally unstable substrates (e.g., plastics and paper), in addition photo-reduction methods are expensive and only capable of reducing the external surface. Therefore, solid-state chemical reduction techniques could become a convenient approach for the full thickness reduction of the GO layers supported on thermally unstable substrates. Here, a novel experimental procedure for quantitative reduction of GO films on paper by a green and low-cost chemical reductant (L-ascorbic acid, L-aa) is proposed. The possibility to have an effective mass transport of the reductant inside the swelled GO solid (gel-phase) deposit was ensured by spraying a reductant solution on the GO film and allowing it to reflux in a closed microenvironment at 50 °C. The GO conversion degree to reduced graphene oxide (r-GO) was evaluated by Fourier transform infrared spectroscopy (FT-IR) in attenuated total reflectance (ATR) mode and X-ray Diffraction (XRD). In addition, morphology and wettability of GO deposits, before and after reduction, were confirmed by digital USB microscopy, scanning electron microscopy (SEM), and contact angle measurements. According to these structural characterizations, the proposed method allows a bulky reduction of the coating but leaves to a GO layer at the interface, that is essential for a good coating-substrate adhesion and this special characteristic is useful for industrial exploitation of the material.

scholarly journals Preparation of a graphene/silver hybrid membrane as a new nanofiltration membrane

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 49159-49165 ◽  
Author(s):  
Gui-fei Liu ◽  
Lin-jun Huang ◽  
Yan-xin Wang ◽  
Jian-guo Tang ◽  
Yao Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Composite Membrane ◽  
Reduction Method ◽  
Water Flux ◽  
Thermal Reduction ◽  
Hybrid Membrane ◽  
Nanofiltration Membrane ◽  
Reduced Graphene

In this study, we describe the preparation, characterization, water flux and rejection performance of a composite membrane formed from reduced graphene oxide (RGO) and silver nanoparticles (AgNP) via a rapid thermal reduction method.

scholarly journals a EFFECT OF DIFFERENT ADDITIVES ON METALLIC LEAD RECOVERY FROM CRT FUNNEL GLASS USING THERMAL METHOD

2020 ◽  
Vol 20 (1) ◽  
pp. 1-11
Author(s):  
Muna K. Abbass ◽  
Abdulkaliq F. Hmood
Keyword(s):  
Sodium Carbonate ◽  
Reduction Method ◽  
Sodium Sulfide ◽  
Thermal Reduction ◽  
Optimum Process ◽  
Thermal Method ◽  
Carbon Powder ◽  
Process Conditions ◽  
Metallic Lead ◽  
Lead Recovery

Cathode ray tube like as electronic waste is a green crisis due to its toxicity. Remove of the lead from CRT funnel glass can prevent it from release into the environmental and allow it reuse. There are several ways to separation lead from its CRT funnel glass and then recovered from it. In this research, CRT funnel glass was treated by high thermal reduction method with using different additives. These additives that used in this method are sodium carbonate (Na2CO3 ) with (20, 25&30) wt% used as a melting agent, sodium sulfide ( Na2S) with (6, 8&10)wt% used as a catalytic agent and carbon powder (C) with (2.4, 3.6 &4.8) wt% used as a reducing agent, at fixed temperature (1100°C) and holding time (120 min). Taguchi technique for design of experiment (DOE) was applied to find the optimum process conditions of different additives for metallic lead recovery by high thermal reduction method. Experimental results presented that the maximum lead recovery was 97.36% when the optimum conditions were sodium carbonate (30%), sodium sulfide (10%), and carbon powder (3.6%) at 1100°C and 120 min.

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