scholarly journals A Novel Inspection for Deformation Phenomenon of Reduced-graphene Oxide via Quantitative Nano-mechanical Atomic Force Microscopy

2012 ◽  
Vol 36 ◽  
pp. 571-577 ◽  
Author(s):  
Jen-You Chu ◽  
Wei-Sheng Hsu ◽  
Wei-Ren Liu ◽  
Hung-Min Lin ◽  
Hsin-Ming Cheng ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene

scholarly journals Mechanical Characterization of Reduced Graphene Oxide Using AFM

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Alem Teklu ◽  
Canyon Barry ◽  
Matthew Palumbo ◽  
Collin Weiwadel ◽  
Narayanan Kuthirummal ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Young’S Modulus ◽  
Reduced Graphene Oxide ◽  
Young's Modulus ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduction Cycle ◽  
Reduced Graphene ◽  
Oxide Sample

Nanoindentation coupled with Atomic Force Microscopy was used to study stiffness, hardness, and the reduced Young’s modulus of reduced graphene oxide. Oxygen reduction on the graphene oxide sample was performed via LightScribe DVD burner reduction, a cost-effective approach with potential for large scale graphene production. The reduction of oxygen in the graphene oxide sample was estimated to about 10 percent using FTIR spectroscopic analysis. Images of the various samples were captured after each reduction cycle using Atomic Force Microscopy. Elastic and spectroscopic analyses were performed on the samples after each oxygen reduction cycle in the LightScribe, thus allowing for a comparison of stiffness, hardness, and the reduced Young’s modulus based on the number of reduction cycles. The highest values obtained were after the fifth and final reduction cycle, yielding a stiffness of 22.4 N/m, a hardness of 0.55 GPa, and a reduced Young’s modulus of 1.62 GPa as compared to a stiffness of 22.8 N/m, a hardness of 0.58 GPa, and a reduced Young’s modulus of 1.84 GPa for a commercially purchased graphene film made by CVD. This data was then compared to the expected values of pristine single layer graphene. Furthermore, two RC circuits were built, one using a parallel plate capacitors made of light scribed graphene on a kapton substrate (LSGC) and a second one using a CVD deposited graphene on aluminum (CVDGC). Their RC time constants and surface charge densities were compared.

The correlation between electrical conductivity and second-order Raman modes of laser-reduced graphene oxide

2019 ◽  
Vol 21 (19) ◽  
pp. 10125-10134 ◽  
Author(s):  
Bing Ma ◽  
Raul D. Rodriguez ◽  
Alexey Ruban ◽  
Sergey Pavlov ◽  
Evgeniya Sheremet
Keyword(s):  
Electrical Conductivity ◽  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Electrical Properties ◽  
Reduced Graphene Oxide ◽  
Second Order ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene ◽  
Raman Modes

Second-order Raman modes correlate with the electrical properties of reduced graphene oxide measured at the nanoscale by atomic force microscopy.

Dielectrophoretic assembly and atomic force microscopy modification of reduced graphene oxide

2011 ◽  
Vol 110 (11) ◽  
pp. 114515 ◽  
Author(s):  
Yu Zhang ◽  
Lianqing Liu ◽  
Ning Xi ◽  
Yuechao Wang ◽  
Zaili Dong ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene

Preparation and properties of chemically reduced graphene oxide/copolymer-polyamide nanocomposites

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Xin Liu ◽  
Xiao Yu Shao ◽  
Guan Biao Fang ◽  
Hai Feng He ◽  
Zhen Gao Wan
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide

AbstractTo enhance the physical properties of copolymer-polyamide (CO-PA), a sequence of nanocomposites based upon CO-PA and chemically reduced graphene oxide (CRGO) nanoplatelets were prepared by in-situ reduction using hydrazine hydrate. Graphene oxide (GO), prepared by the improved Hummers method, was used to fabricate CRGO nanaoplatelets. Atomic-force microscopy (AFM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis showed that the thickness and the width of GO was about 0.9 nm and 1 μm, respectively. An abundance of oxygen-containing functional groups were introduced onto the GO sheets. XRD and SEM analysis showed that CRGO nanoplatelets were well dispersed in the CO-PA matrix with the appropriate CRGO content. TGA and DSC analysis demonstrated that CRGO nanoplatelets can significantly improve the thermal stability, glass-transition temperature, crystallization temperature of the composites. The mechanical properties of the nanocomposites were improved significantly with the appropriate increment of CRGO nanoplatelets content, though the elongation at break of the composites decreased with the increase of CRGO nanoplatelets content. The electrical conductivity test showed a significant increase in electrical conductivity from an insulator to almost a semiconductor with increasing CRGO nanoplatelets content. And at 1.0 wt% CRGO content, the electrical percolation threshold of the nanocomposites was found.

scholarly journals Studies of physicochemical properties of graphite oxide and thermally exfoliated/reduced graphene oxide

2015 ◽  
Vol 17 (4) ◽  
pp. 109-114 ◽  
Author(s):  
Sabina Elżbieta Drewniak ◽  
Tadeusz Piotr Pustelny ◽  
Roksana Muzyka ◽  
Agnieszka Plis
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphite Oxide ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene ◽  
Elemental Analyses ◽  
Composition Changes ◽  
Scanning Electron

Abstract The aim of the experimental research studies was to determine some electrical properties of graphite oxide and thermally exfoliated/reduced graphene oxide. The authors tried to interpret the obtained physicochemical results. For that purpose, both resistance measurements and investigation studies were carried out in order to characterize the samples. The resistance was measured at various temperatures in the course of composition changes of gas atmospheres (which surround the samples). The studies were also supported by such methods as: scanning electron microscopy (SEM), Raman spectroscopy (RS), atomic force microscopy (AFM) and thermogravimetry (TG). Moreover, during the experiments also the elemental analyses (EA) of the tested samples (graphite oxide and thermally exfoliated/reduced graphene oxide) were performed.

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.

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