Fast and non-invasive conductivity determination by the dielectric response of reduced graphene oxide: an electrostatic force microscopy study

Nanoscale ◽  
2012 ◽  
Vol 4 (22) ◽  
pp. 7231 ◽  
Author(s):  
Cristina Gómez-Navarro ◽  
Francisco J. Guzmán-Vázquez ◽  
Julio Gómez-Herrero ◽  
Juan J. Saenz ◽  
G. M. Sacha
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dielectric Response ◽  
Electrostatic Force ◽  
Microscopy Study ◽  
Electrostatic Force Microscopy ◽  
Force Microscopy ◽  
Non Invasive ◽  
Reduced Graphene

Direct Imaging of Charge Transport in Progressively Reduced Graphene Oxide Using Electrostatic Force Microscopy

ACS Nano ◽  
2015 ◽  
Vol 9 (3) ◽  
pp. 2981-2988 ◽  
Author(s):  
Sibel Ebru Yalcin ◽  
Charudatta Galande ◽  
Rajesh Kappera ◽  
Hisato Yamaguchi ◽  
Ulises Martinez ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Charge Transport ◽  
Reduced Graphene Oxide ◽  
Electrostatic Force ◽  
Electrostatic Force Microscopy ◽  
Direct Imaging ◽  
Force Microscopy ◽  
Reduced Graphene

Unusual dielectric response in cobalt doped reduced graphene oxide

2013 ◽  
Vol 103 (24) ◽  
pp. 242902 ◽  
Author(s):  
Abu Jahid Akhtar ◽  
Abhisek Gupta ◽  
Bikash Kumar Shaw ◽  
Shyamal K. Saha
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dielectric Response ◽  
Reduced Graphene

scholarly journals Electrostatic force spectroscopy revealing the degree of reduction of individual graphene oxide sheets

2018 ◽  
Vol 9 ◽  
pp. 1146-1155 ◽  
Author(s):  
Yue Shen ◽  
Ying Wang ◽  
Yuan Zhou ◽  
Chunxi Hai ◽  
Jun Hu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Graphene Oxide ◽  
Electrostatic Force ◽  
Force Spectroscopy ◽  
Restricted Area ◽  
Degree Of Reduction ◽  
Force Microscopy ◽  
Reducing Conditions ◽  
Direct Current Bias ◽  
Reduced Graphene

Electrostatic force spectroscopy (EFS) is a method for monitoring the electrostatic force microscopy (EFM) phase with high resolution as a function of the electrical direct current bias applied either to the probe or sample. Based on the dielectric constant difference of graphene oxide (GO) sheets (reduced using various methods), EFS can be used to characterize the degree of reduction of uniformly reduced one-atom-thick GO sheets at the nanoscale. In this paper, using thermally or chemically reduced individual GO sheets on mica substrates as examples, we characterize their degree of reduction at the nanoscale using EFS. For the reduced graphene oxide (rGO) sheets with a given degree of reduction (sample n), the EFS curve is very close to a parabola within a restricted area. We found that the change in parabola opening direction (or sign the parabola opening value) indicates the onset of reduction on GO sheets. Moreover, the parabola opening value, the peak bias value (tip bias leads to the peak or valley EFM phases) and the EFM phase contrast at a certain tip bias less than the peak value can all indicate the degree of reduction of rGO samples, which is positively correlated with the dielectric constant. In addition, we gave the ranking of degree for reduction on thermally or chemically reduced GO sheets and evaluated the effects of the reducing conditions. The identification of the degree of reduction of GO sheets using EFS is important for reduction strategy optimization and mass application of GO, which is highly desired owing to its mechanical, thermal, optical and electronic applications. Furthermore, as a general and quantitative technique for evaluating the small differences in the dielectric properties of nanomaterials, the EFS technique will extend and facilitate its nanoscale electronic devices applications in the future.

scholarly journals Formation and Characterization of Copper Nanocube-Decorated Reduced Graphene Oxide Film

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
M. Z. H. Khan ◽  
M. A. Rahman ◽  
P. Yasmin ◽  
F. K. Tareq ◽  
N. Yuta ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Indium Tin Oxide ◽  
Chemical Reduction ◽  
Device Fabrication ◽  
Simple Method ◽  
Force Microscopy ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
The Individual

In this study, we present a new approach for the formation and deposition of Cu nanocube-decorated reduced graphene oxide (rGO-CuNCs) nanosheet on indium tin oxide (ITO) electrode using very simple method. Cubic Cu nanocrystals have been successfully fabricated on rGO by a chemical reduction method at low temperature. The morphologies of the synthesized materials were characterized by ultraviolet-visible (UV-vis) spectroscopy, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and atomic force microscopy (AFM). The as-formed CuNCs were found to be homogeneously and uniformly decorated on rGO nanosheets. We demonstrated that the individual rGO sheets can be readily reduced and decorated with CuNCs under a mild condition using L-ascorbic acid (L-AA). Such novel ITO/rGO-CuNCs represent promising platform for future device fabrication and electrocatalytic applications.

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.

scholarly journals Reduced Graphene Oxide/TiO2 Nanocomposite: From Synthesis to Characterization for Efficient Visible Light Photocatalytic Applications

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 598 ◽  
Author(s):  
Elena Rommozzi ◽  
Marco Zannotti ◽  
Rita Giovannetti ◽  
Chiara D’Amato ◽  
Stefano Ferraro ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Thermal Reduction ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Force Microscopy ◽  
Reduced Graphene ◽  
Visible Light Photocatalytic

In this study, a green and facile thermal reduction of graphene oxide using an eco-friendly system of d-(+)-glucose and NH4OH for the preparation of reduced graphene oxide was described. The obtained reduced graphene oxide dispersion was characterized by SEM, Dynamic Light Scattering, Raman and X-Ray Photoelectron Spectroscopy. TiO2 nanoparticles and reduced graphene oxide nanocomposites were successively prepared and used in the preparation of heterogeneous photocatalysts that were characterized by Atomic Force Microscopy and Photoluminescence Spectroscopy and subsequently tested as visible light photocatalysts for the photodegradation of Alizarin Red S in water as target pollutant. Obtained results of photocatalytic tests regarding the visible light photocatalytic degradation of Alizarin Red S demonstrated that the use of reduced graphene oxide in combination with TiO2 led to a significant improvement for both adsorption of Alizarin Red S on the catalyst surface and photodegradation efficiencies when compared to those obtained with not doped TiO2.

Sample-charged mode scanning polarization force microscopy for characterizing reduced graphene oxide sheets

2014 ◽  
Vol 115 (24) ◽  
pp. 244302 ◽  
Author(s):  
Yue Shen ◽  
Ying Wang ◽  
Jinjin Zhang ◽  
Chunxi Hai ◽  
Yuan Zhou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Force Microscopy ◽  
Polarization Force ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets
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