scholarly journals Temperature-time dependent transmittance, sheet resistance and bonding energy of reduced graphene oxide on soda lime glass

2017 ◽  
Vol 425 ◽  
pp. 558-563 ◽  
Author(s):  
Raj Kumar ◽  
R. Manoj Kumar ◽  
Parthasarathi Bera ◽  
S. Ariharan ◽  
Debrupa Lahiri ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Soda Lime ◽  
Time Dependent ◽  
Bonding Energy ◽  
Soda Lime Glass ◽  
Reduced Graphene ◽  
Temperature Time

Effect of Gold Nanoparticles on Optoelectronic Properties of Thermally Reduced Graphene Oxide

NANO ◽  
2021 ◽  
pp. 2150067
Author(s):  
Mohd Faizol Abdullah
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Hybrid Film ◽  
High Energy ◽  
Optoelectronic Properties ◽  
Photon Absorption ◽  
Strong Absorption Band ◽  
Reduced Graphene

Gold nanoparticles (AuNPs)-decorated reduced graphene oxide (rGO) is a compelling material from both aspects of processing and functionality. This paper presents an alternative method to prepare and alter the optoelectronic properties of the AuNPs-rGO hybrid film. Au was sputtered for a duration of 0–60 s on graphene oxide (GO) film before subjected to thermal reduction at 700∘C. The surface of rGO was decorated by spherical AuNPs with a mean particle size of around 10[Formula: see text]nm due to the solid-state dewetting process. The surface plasmon resonance (SPR) of AuNPs around 550[Formula: see text]nm was intense when the Au sputter duration exceeded 20[Formula: see text]s. Remarkably, the AuNPs layer retarded the de-oxygenation of GO during thermal annealing. The AuNPs-rGO hybrid film with long-duration Au sputtering exhibited low optical constants and thicker rGO film. The AuNPs also played the role in lowering the bandgap, increasing the lattice disorder and assisting the high-energy photon absorption in the thermally reduced rGO film. The sample of 30[Formula: see text]s and 40[Formula: see text]s Au sputtering was optimum to obtain the lowest sheet resistance of 59[Formula: see text]k[Formula: see text]/sq and 56[Formula: see text]k[Formula: see text]/sq, respectively. The sheet resistance was bargained between de-oxygenation retardation and doping by the AuNPs. Both samples of 30 s and 40 s Au sputtering were having a unique and satisfyingly strong absorption band around 260[Formula: see text]nm, 350[Formula: see text]nm and 555[Formula: see text]nm corresponding to [Formula: see text]* transition, [Formula: see text]* transition and SPR of AuNPs, respectively. Such properties are desirable in several applications such as a transparent electrode and optoelectronic sensor.

Functionalization and Chemical Linking of Reduced Graphene Oxide or Graphite onto Polyurethane and the Impact on the Tensile Strength and Sheet Resistance of Polymer Composites

2018 ◽  
Vol 26 (2) ◽  
pp. 141-153
Author(s):  
Yong-Chan Chung ◽  
Ho-Sung Kim ◽  
Byoung Chul Chun
Keyword(s):  
Tensile Strength ◽  
Graphene Oxide ◽  
Shape Memory ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Sharp Decrease ◽  
Hydroxyl Groups ◽  
Functionalized Graphene Oxide ◽  
Reduced Graphene ◽  
The Impact

Reduced graphene oxide (RGO) or graphite is functionalized with hydroxyl groups for linking to the sides of polyurethane (PU) chains. Blended PU with RGO or graphite is prepared as a control for comparison. The PU composites are compared with respect to their spectroscopic, thermal, mechanical, shape memory, and sheet resistance properties. Scanning electron microscopy images demonstrate the good distribution of functionalized graphene oxide (FGO) or functionalized graphite (FG) particles on the inner surface of the PU. The linking of FGO or FG onto PU does not significantly affect the thermal behavior or shape memory properties but sharply improves the tensile strength of the PU composites without a noticeable decrease in tensile strain. The shape recovery of PU composites remains at approximately 90%, regardless of the FGO or FG content. The FG-linked PU composites exhibit a sharp decrease in sheet resistance as the FG content increases, whereas the sheet resistance of the FGO-linked PU composites does not decrease with increasing FGO content. The control PU composites with blended RGO or graphite show significant reductions in their sheet resistance. Considering the ease of functionalization of the graphite surface and the significant improvement in tensile strength, linking FG onto PU is advantageous for the development of PU composites with low sheet resistance.

scholarly journals Fabrication of reduced graphene oxide modified poly(3,4-ethylenedioxythiophene) polystyrene sulfonate based transparent conducting electrodes for flexible optoelectronic application

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Sandeep Sharma ◽  
Karamvir Singh ◽  
Sandeep Kumar ◽  
Kapil Bhatt ◽  
Yashashchandra Dwivedi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Optical Transmittance ◽  
Bending Test ◽  
Polystyrene Sulfonate ◽  
Maximum Increase ◽  
Transparent Conducting ◽  
Reduced Graphene ◽  
Transparent Conducting Electrodes

AbstractPresent article reports on reduced graphene oxide (rGO) modified poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) based transparent conducting electrodes for flexible optoelectronic applications. PEDOT: PSS samples embedded with different rGO concentrations i.e. 0, 1, 2, 3, 4, 5 wt% were prepared and later on, bar coated on polyethylene terephthalate substrate using a 30 μm wire size bar. Various parameters including sheet resistance, bending test (outside and inside bending), optical transmittance etc. were estimated. Our analysis indicates that the samples with 1 wt% rGO possess improved results i.e. low sheet resistance (315 ± 8 Ω/sq.) and high transmittance (~ 74%). Additionally, the sample shows low electrical resistance variation up to 12% (maximum increase) during outward bending and 9% (maximum decrease) during inward bending of the sample for bending curvature from 20 to 100 m−1.

Graphene Based Transparent Conductive Electrode

2012 ◽  
Vol 468-471 ◽  
pp. 1823-1826 ◽  
Author(s):  
Ya Nan Wang ◽  
Peng Fei Gu ◽  
Jia Jia Cao ◽  
Tian Quan Lv ◽  
Tie Qiang Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxide Films ◽  
Good Alternative ◽  
Transparent Conductor ◽  
Transparent Conductive Electrode ◽  
Reduced Graphene

As indium tin oxide (ITO) can not meet the demands of many devices due to its fragility, graphene seems to be a good alternative for transparent conductor purpose. Here we employ two methods to prepare graphene oxide films, and then process them with hydroiodic acid (HI) for reduction, aiming to get an optimized scheme and higher film quality. Finally the reduced graphene oxide films with transmittance of 70~80% at 550nm show sheet resistance of <10kΩ, which are good enough for transparent conductor uses. This study portends a promising future in this field.

Efficient defect healing and ultralow sheet resistance of laser-assisted reduced graphene oxide at ambient conditions

Carbon ◽  
2018 ◽  
Vol 139 ◽  
pp. 492-499 ◽  
Author(s):  
Aspasia Antonelou ◽  
Labrini Sygellou ◽  
Katerina Vrettos ◽  
Vasilios Georgakilas ◽  
Spyros N. Yannopoulos
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Ambient Conditions ◽  
Defect Healing ◽  
Reduced Graphene
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