Coexistence of interfacial stress and charge transfer in graphene oxide-based magnetic nanocomposites

Mishra, Amodini; Singh, Vikash Kumar; Mohanty, T.

doi:10.1007/s10853-017-1062-1

Cited by 50 publications

(38 citation statements)

References 43 publications

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“…4 c that the D and G bands of hybrid shifted towards lower wavenumber (redshift), and its full-width half maxima are also changed in comparison to rGO. These results indicate the hybridization of rGO and Co orbitals and confirm strong electronic interaction between rGO and Co in the hybrid structure [ 8 , 20 ] The splitting in G-band of both rGO and Co-rGO hybrid (Fig. 4 c) established that the rGO sheets are not more than trilayer-graphene [ 21 ].…”

Section: Resultsmentioning

confidence: 80%

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

2020

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Control over the magnetic interactions in magnetic nanoparticles (MNPs) is a crucial issue to the future development of nanometer-sized integrated "spintronic" applications. Here, we have developed a nanohybrid structure to achieve room temperature ferromagnetism, via a facile, effective, and reproducible solvothermal synthesis method. The plan has been put onto cobalt (Co) NPs, where the growth of Co NPs on the surface of reduced graphene oxide (rGO) nanosheets switches the magnetic interactions from superparamagnetic to ferromagnetic at room temperature. Switching-on ferromagnetism in this nanohybrid may be due to the hybridization between unsaturated 2p z orbitals of graphene and 3d orbitals of Co, which promotes ferromagnetic long-range ordering. The ferromagnetic behavior of Co-rGO nanohybrid makes it excellent material in the field of spintronics, catalysis, and magnetic resonance imaging.

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Section: Resultsmentioning

confidence: 80%

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

2020

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“…2a). This disorder in the network causes compressive stress in Nb 2 O 5 , leading to a dispersion of the phonon, thus increasing the frequency of phonons that interact with the photon in the sample and causing the wavenumber to shift to a higher value [58,59].…”

Section: Resultsmentioning

confidence: 99%

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

et al. 2021

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The performance of niobium pentoxide (Nb 2 O 5 ) as photoanodes in dye-sensitized solar cells (DSSCs) and as catalysts in the photocatalytic degradation of Rhodamine B (RhB) was investigated. Four samples of Nb 2 O 5 (Nb 2 O 5 _SG, Nb 2 O 5 _CR, Nb 2 O 5 _PP, and Nb 2 O 5 _MA) were synthesized by four different methods, respectively, entailing the sol-gel, combustion, polymeric precursors, and a microwave-assisted hydrothermal reaction. In all these samples, the orthorhombic phase of Nb 2 O 5 was obtained, which resulted in different shapes and assemblies, which is very relevant because the surface area, shape, and size distribution of the nanoparticles significantly contribute to the optical process. The bandgap remained constant at 3.0 eV for all the samples, even for the sample prepared by the combustion method. An additional phase, which is related to local distortions, was revealed by Raman spectroscopy within the vibration range of 688-260 cm -1 . DSSCs using photoanodes with smaller and more dispersed Nb 2 O 5 particles showed better results than those with inhomogeneities. For comparison, DSSCs were assembled using two different counter electrodes, platinum and graphite. The DSSC with platinum showed better photovoltaic results, mainly with photocurrents from 1.17 mA.cm -2 for Nb 2 O 5 _CR to 1.64 mA.cm -2 for Nb 2 O 5 _SG. The same trend was observed for the photocatalytic degradation of RhB, where the smaller and dispersed particles of Nb 2 O 5 _CR and Nb 2 O 5 _SG exhibited the best performance and, respectively, degraded approximately 75% and 61% of the RhB dye over 180 min. Therefore, the results of this study established a correlation between the synthesis methods and photonic behavior.

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“…The average measurement value in a 10 × 10 mm area was calculated based on 10 measurements. The relationship equation between values of measurement MT and calibrated optical retardation ∅ c based on common-path optical interferometry could be obtained using a least-square fitting algorithm [47] as ∅ c = 2.64MT − 19.08 (16) To analyze the mechanical characteristics of the transparent conductive film-coated PET substrates under curving, an ASTP [42] was used to conduct a whole-folding test. The ASTP controlled the screw mechanism to enable the stage to move back and forth during the whole-folding test of the entire sample up to a 5-mm folding radius, as shown in Figure 6.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, in recent years, for the application of flexible substrates or sensors, graphene materials have been added to improve the conductivity, mechanical properties, electromagnetic effects, heat conduction effects, and optical transmittance of flexible transparent optical films [10][11][12][13][14]. For quality mechanical measurements of graphene film 2 of 13 materials, most studies have used non-contact Raman spectroscopy [15][16][17][18][19]; others have used atomic force microscopy [20][21][22]. These mechanical characteristic measurements require precision and expensive equipment, such as Raman spectrometers and atomic force microscopes, and the measurement range can be as high as hundreds of microns.…”

Section: Introductionmentioning

confidence: 99%

Curved-Mechanical Characteristic Measurements of Transparent Conductive Film-Coated Polymer Substrates Using Common-Path Optical Interferometry

Wen

Hsu

2021

Coatings

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This study proposes a method for measuring curved-mechanical characteristics based on a whole-folding test for transparent conductive film-coated polymer substrates using common-path optical interferometry. Accordingly, 80-, 160-, and 230-nm indium tin oxide films coated on 40 × 40 mm 125-μm-thick polyethylene terephthalate (PET) substrates, and monolayer graphene films coated on 40 × 40 mm 250-μm-thick PET substrates are inspected and analyzed under the curving conditions of 50-, 30-, 20-, and 10-mm radii before and after an 11,000 whole-folding cycle test based on a 10-mm folding radius. This study utilizes the changes in the phase retardations of transparent conductive film-coated polymer substrates under different curving conditions before and after 11,000 whole-folding cycles to analyze the substrates’ residual stress characteristics that were the direct result of manufacturing process parameters. The results from this study of curved-mechanical characteristic measurements of flexible transparent conductive substrates can provide designers with improved product development and can assist manufacturers in improving the manufacturing design of enhanced coating processes.

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Coexistence of interfacial stress and charge transfer in graphene oxide-based magnetic nanocomposites

Abstract: In this paper, we establish the existence of both compressive stress and charge transfer Lattice strain estimated from XRD peaks are correlated to the observed Raman shift.

Cited by 50 publications

References 43 publications

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

Curved-Mechanical Characteristic Measurements of Transparent Conductive Film-Coated Polymer Substrates Using Common-Path Optical Interferometry

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