scholarly journals Conductive Nanofilms with Oppositely Charged Reduced Graphene Oxides as a Base for Electroactive Coatings and Sensors

2021 ◽  
Vol 5 (2) ◽  
pp. 20
Author(s):  
Tomasz Kruk ◽  
Piotr Warszyński
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Low Cost ◽  
Thermal Reduction ◽  
Layer By Layer ◽  
Graphene Oxides ◽  
Lbl Assembly ◽  
Reduced Graphene ◽  
Amidation Reaction ◽  
Oppositely Charged

We demonstrate a method for the formation of multilayers composed of reduced graphene oxide (rGO), which can be used for transparent, conducting thin films. Using the layer-by-layer (LbL) assembly of positively and negatively charged GO sheets, we could obtain thin films with highly controllable sheet resistance. The natural negative charge of graphene oxide was turned to positive by the amidation reaction. After forming the multilayer films, the graphene oxide underwent thermal reduction at temperatures above 150 °C. The (rGO+/rGO−) films were characterized by UV-Vis and scanning electron microscopy (SEM), and their conductivity was measured by the four-point method. We found that after deposition of five (rGO+/rGO−), the coating structure reached the percolation limit, and the film resistance decreased more gradually to around 20 kΩ/sq for the films obtained by eleven deposition cycles with graphene oxide reduced at 250 °C. The formation of thin films on polyimide allows the forming of new flexible conductive materials, which can find applications, e.g., in biomedicine as new electroactive, low-cost, disposable sensors.

Fabrication and its Transient Optical Properties of Graphene Thin Films

2013 ◽  
Vol 743-744 ◽  
pp. 892-902 ◽  
Author(s):  
Jia Yi Zhu ◽  
Jun Hui He
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Post Treatment ◽  
Layer By Layer ◽  
Graphene Oxides ◽  
Visible Absorption ◽  
Lbl Assembly ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Means Of Transmission

Graphene thin films were fabricated via layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxides (RGOs) and benign post-treatment. RGOs dispersions and thin films were characterized by means of transmission electron microscopy, UV-visible absorption spectrophotometer, Raman spectroscopy, and four-point probe. It was found that graphene thin films exhibited a significant increase in electrical conductivity after post-treatment. In addition, post-treatment and film thickness showed an effect on transient optical properties of graphene thin films. The transmittance (800 nm, pulse) of (RGO-PDDA+/RGO-O-)30 film decreased after post-treatment, and the transmittance (800 nm, pulse) of post-treated films decreased with increasing the number of LbL assembled bilayers.

Fabrication of Graphene-Based Nanostructured Thin Films with Mid-Infrared Photoresponse Properties

2014 ◽  
Vol 13 (05n06) ◽  
pp. 1460008 ◽  
Author(s):  
Jiayi Zhu ◽  
Lin Zhang ◽  
Weidong Wu ◽  
Yang Cao ◽  
Junhui He
Keyword(s):  
Layer By Layer ◽  
Hybrid Films ◽  
Nanostructured Films ◽  
Mid Infrared ◽  
New Approach ◽  
Conductive Films ◽  
Lbl Assembly ◽  
Reduced Graphene ◽  
Metal Oxide Nanomaterials ◽  
Oppositely Charged

Graphene shows great potential as an advanced building block for fabricating varied graphene based nanostructured films together with other metal and metal oxide nanomaterials. In the current work, a new approach was developed to fabricate flexible, transparent conductive films via layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxide (RGO) nanosheets. We further fabricated transparent conductive hybrid films via LbL assembly of oppositely charged RGO nanosheet and platinum ( Pt ) nanoparticle as well as silica ( SiO 2) nanoparticle. It was found that the graphene based nanostructured films showed different mid-infrared photoresponse properties. Moreover, the photoresponse performance could be manipulated by the power and distance between two electrodes.

Controllable Fabrication of Flexible Multi-Walled Carbon Nanotubes/Reduced Graphene Oxide Hybrid Ultrathin Films

2015 ◽  
Vol 748 ◽  
pp. 175-178
Author(s):  
Wen Xiu Yu ◽  
Su Jie Qin ◽  
Zuo Ping Xiong ◽  
Zhong Qiang Ren ◽  
Xue Wen Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Carbon Nanomaterials ◽  
Low Cost ◽  
Layer By Layer ◽  
Hybrid Films ◽  
Reduced Graphene ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes/reduced graphene oxide (MWCNT/rGO) hybrid films have attracted increasing massive attention due to their unique advantages such as high conductivity, superior mechanical property and thermal properties. In this work, a novel, facile and low cost method was developed to fabricate the MWCNT/rGO flexible ultrathin hybrid films with the thickness of about 55 nm. These hybrid films can be fabricated repeatedly through layer-by-layer exfoliation on the surface of liquids, and transferred to various substrates. The devices based on MWCNT/rGO hybrid films offer a unique platform for integrating carbon nanomaterials for advanced electronics, energy, and sensor applications.

Reduction Kinetics of Thermally Reduced Graphene Oxide Thin Films

2015 ◽  
Vol 827 ◽  
pp. 317-320 ◽  
Author(s):  
Fitrilawati ◽  
Norman Syakir ◽  
Annisa Aprilia ◽  
Zhou Yang Liu ◽  
Xin Liang Feng ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Reduced Graphene Oxide ◽  
Absorption Spectra ◽  
Thermal Reduction ◽  
Reduction Kinetics ◽  
Glass Substrates ◽  
Reduced Graphene ◽  
Kinetics Of

We report an experimentalstudy of thermal reduction of graphene oxide (GO) under nitrogen flow.Ultrathin films of GO were prepared on quartz glass substrates by spin-coatingfrom 3 mg/ml aqueous solutions of GO. These films were annealed at 50 °C under vacuum overnight before thermal reduction.The films were exposed to temperatures of 100 °C, 150 °C, 200 °C, 300 °C, 400 °C, 500 °C and 800 °C under nitrogen flowing. We used UV-Vis absorption spectroscopy tomonitor the change of absorption spectra caused by thermal reduction. We observed a significant change ofabsorption spectra due to formation of reduced graphene oxide (RGO). We found that thermal reduction startedalready at 100 °C, but proceeded significantly faster at heating temperatures higherthan 200 °C.

scholarly journals Thermally Reduced Graphene Oxide/Thermoplastic Polyurethane Nanocomposites: Mechanical and Barrier Properties

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 85
Author(s):  
Santiago Maldonado-Magnere ◽  
Mehrdad Yazdani-Pedram ◽  
Héctor Aguilar-Bolados ◽  
Raul Quijada
Keyword(s):  
Graphene Oxide ◽  
Thermoplastic Polyurethane ◽  
Young Modulus ◽  
Barrier Properties ◽  
Thermal Reduction ◽  
X Ray Diffraction ◽  
Graphene Oxides ◽  
Melt Mixing ◽  
Mixing Processes ◽  
Reduced Graphene

This work consists of studying the influence of two thermally reduced graphene oxides (TRGOs), containing oxygen levels of 15.8% and 8.9%, as fillers on the barrier properties of thermoplastic polyurethane (TPU) nanocomposites prepared by melt-mixing processes. The oxygen contents of the TRGOs were obtained by carrying out the thermal reduction of graphene oxide (GO) at 600 °C and 1000 °C, respectively. The presence and contents of oxygen in the TRGO samples were determined by XPS and their structural differences were determined by using X-ray diffraction analysis and Raman spectroscopy. In spite of the decrease of the elongation at break of the nanocomposites, the Young modulus was increased by up to 320% with the addition of TRGO. The barrier properties of the nanocomposites were enhanced as was evidenced by the decrease of the permeability to oxygen, which reached levels as low as −46.1%.

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