scholarly journals Development of highly faceted reduced graphene oxide-coated copper oxide and copper nanoparticles on a copper foil surface

2016 ◽  
Vol 7 ◽  
pp. 1010-1017 ◽  
Author(s):  
Rebeca Ortega-Amaya ◽  
Yasuhiro Matsumoto ◽  
Andrés M Espinoza-Rivas ◽  
Manuel A Pérez-Guzmán ◽  
Mauricio Ortega-López
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
Copper Nanoparticles ◽  
Copper Foil ◽  
Annealing Temperature ◽  
Copper Oxide Nanoparticles ◽  
Hybrid Nanostructures ◽  
Reduced Graphene

This work describes the formation of reduced graphene oxide-coated copper oxide and copper nanoparticles (rGO-Cu2ONPs, rGO-CuNPs) on the surface of a copper foil supporting graphene oxide (GO) at annealing temperatures of 200–1000 °C, under an Ar atmosphere. These hybrid nanostructures were developed from bare copper oxide nanoparticles which grew at an annealing temperature of 80 °C under nitrogen flux. The predominant phase as well as the particle size and shape strongly depend on the process temperature. Characterization with transmission electron microscopy and scanning electron microscopy indicates that Cu or Cu2O nanoparticles take rGO sheets from the rGO network to form core–shell Cu–rGO or Cu2O–rGO nanostructures. It is noted that such ones increase in size from 5 to 800 nm as the annealing temperature increases in the 200–1000 °C range. At 1000 °C, Cu nanoparticles develop a highly faceted morphology, displaying arm-like carbon nanorods that originate from different facets of the copper crystal structure.

Development of highly faceted reduced graphene oxide-coated copper oxide and copper nanoparticles on a copper foil surface

nano Online ◽  
2017 ◽  
Author(s):  
Ortega-Amaya ◽  
Yasuhiro Matsumoto ◽  
Espinoza-Rivas ◽  
Pérez-Guzmán ◽  
Ortega-López
Keyword(s):  
Graphene Oxide ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
Copper Nanoparticles ◽  
Copper Foil ◽  
Foil Surface ◽  
Reduced Graphene

scholarly journals Multilayer Structure of Reduced Graphene Oxide and Copper Oxide as a Gas Sensor

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1015
Author(s):  
Tadeusz Pisarkiewicz ◽  
Wojciech Maziarz ◽  
Artur Małolepszy ◽  
Leszek Stobiński ◽  
Dagmara Michoń ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
Electrical Transport ◽  
Total Thickness ◽  
Graphene Layers ◽  
Response Recovery ◽  
Reduced Graphene ◽  
Recovery Times

Reduced graphene oxide and copper oxide multilayer structures were fabricated in a planar configuration by deposition on both ceramic and Si/SiO2 substrates with interdigitated Au electrodes by the spray method. SEM (scanning electron microscopy), TEM (transmission electron microscopy), XRD (X-ray diffraction), and elemental analysis investigations indicated that graphene oxide (GO) was obtained in a form of interconnected flakes consisting of 6–7 graphene layers for GO with the total thickness of ca. 6 nm and 2–3 layers for rGO with the total thickness of 1 nm. The lateral size of one flake reached up to 10 micrometers. Copper oxide was obtained by the wet chemical method. The number of sequential layers of the sensing structure was optimized to obtain good sensitivity and acceptable response/recovery times in response to the oxidizing nitrogen dioxide atmosphere. Both semiconductor partners revealed p-type conductivity. Formation of isotype heterojunctions between both semiconductor partners was taken into account and their influence on electrical transport explained. Optimized sensor structures revealed relative sensitivities reaching several tens of percent and acceptable response and recovery times in NO2 concentration ranged from a few to 20 ppm. Possibility of manufacturing sensors working at room temperature was shown, but at the cost of prolonged response/recovery times.

Synthesis and catalytic performance of hierarchical TiO 2 hollow sphere/reduced graphene oxide hybrid nanostructures

2016 ◽  
Vol 656 ◽  
pp. 181-188 ◽  
Author(s):  
Xiuying Wang ◽  
Jing Wang ◽  
Xiaoli Dong ◽  
Feng Zhang ◽  
Linge Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hollow Sphere ◽  
Catalytic Performance ◽  
Hybrid Nanostructures ◽  
Reduced Graphene

An investigation of copper oxide-loaded reduced graphene oxide nanocomposite for energy storage applications

2021 ◽  
Vol 128 (1) ◽  
Author(s):  
Oladipo Folorunso ◽  
Rotimi Sadiku ◽  
Yskandar Hamam ◽  
Suprakas Sinha Ray
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Energy Storage Applications

Reduced Graphene Oxide Supported Molybdenum Oxide Hybrid Nanocomposites: High Performance Electrode Material for Supercapacitor and Photocatalytic Applications

2020 ◽  
Vol 20 (7) ◽  
pp. 4035-4046
Author(s):  
Rengasamy Dhanabal ◽  
Dhanasekaran Naveena ◽  
Sivan Velmathi ◽  
Arumugam Chandra Bose
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Hybrid Nanocomposites ◽  
X Ray ◽  
Supercapacitor Application ◽  
Quenching Effect ◽  
Reduced Graphene

Using a simple solution based synthesis route, hexagonal MoO3 (h-MoO3) nanorods on reduced graphene oxide (RGO) sheets were prepared. The structure and morphology of resulting RGO-MoO3 nanocomposite were characterized using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). The optical property was studied using UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectroscopy (PL). The RGO-MoO3 nanocomposites were used as an electrode for supercapacitor application and photocatalyst for photodegradation of methylene blue (MB) and rhodamine B (RhB) under visible light irradiation. We demonstrated that the RGO-MoO3 electrode is capable of delivering high specific capacitance of 134 F/g at current density of 1 A/g with outstanding cyclic stability for 2000 cycles. The RGOMoO3 photocatalyst degrades 95% of MB dye within 90 min, and a considerable recyclability up to 4 cycles was observed. The quenching effect of scavengers test confirms holes are main reactive species in the photocatalytic degradation of MB. Further, the charge transfer process between RGO and MoO3 was schematically demonstrated.

scholarly journals Reduced Graphene Oxide–Epoxy Grafted Poly(Styrene-Co-Acrylate) Composites for Corrosion Protection of Mild Steel

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 666
Author(s):  
Xinchuan Fan ◽  
Yue Hu ◽  
Yijun Zhang ◽  
Jiachen Lu ◽  
Xiaofeng Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Scanning Electron

Reduced graphene oxide–epoxy grafted poly(styrene-co-acrylate) composites (GESA) were prepared by anchoring different amount of epoxy modified poly(styrene-co-acrylate) (EPSA) onto reduced graphene oxide (rGO) sheets through π–π electrostatic attraction. The GESA composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion properties of rGO/EPSA composites were evaluated by electro-chemical impedance spectroscopy (EIS) in hydroxyl-polyacrylate coating, and the results revealed that the corrosion rate was decreased from 3.509 × 10−1 to 1.394 × 10−6 mm/a.

Sign in / Sign up

Export Citation Format

Share Document