Electronic, electrical and magnetic behaviours of reduced graphene-oxide functionalized with silica coated gold nanoparticles

Idisi, David O.; Ali, Haydar; Oke, James A.; Sarma, Sweety; Moloi, S.J.; Ray, Sekhar C.; Wang, H.T.; Jana, Nikhil R.; Pong, W. F.; Strydom, A. M.

doi:10.1016/j.apsusc.2019.03.271

Cited by 30 publications

(18 citation statements)

References 30 publications

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“…[45] TheCp eak (537.2 eV) and Dp eak (539.6 eV) are attributed to s* C-O and s* C=O resonance, respectively. [52,53] These XANES results indicate that there are multiple oxygenated functional groups for the prepared samples,a nd their attributions should combine the further characterization technique.…”

Section: Methodsmentioning

confidence: 90%

Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

et al. 2021

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Electrochemical production of hydrogen peroxide (H 2 O 2 )t hrough two-electron (2 e À )o xygen reduction reaction (ORR) is an on-site and clean route.O xygen-doped carbon materials with high ORR activity and H 2 O 2 selectivity have been considered as the promising catalysts,h owever,t here is still alackofdirect experimental evidence to identify true active sites at the complex carbon surface.H erein, we propose ac hemicalt itration strategy to decipher the oxygen-doped carbon nanosheet (OCNS 900 )c atalyst for 2e À ORR. The OCNS 900 exhibits outstanding 2e À ORR performances with onset potential of 0.825 V( vs.R HE), mass activity of 14.5 Ag À1 at 0.75 V( vs.R HE) and H 2 O 2 production rate of 770 mmol g À1 h À1 in flow cell, surpassing most reported carbon catalysts.Through selective chemical titration of C = O, C À OH, and COOH groups,wefound that C = Ospecies contributed to the most electrocatalytic activity and were the most active sites for 2e À ORR, which were corroborated by theoretical calculations.

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Section: Methodsmentioning

confidence: 90%

Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

et al. 2021

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“…The mixture changed from opaque yellow to bluepurple signifying the formation of rGO:Au-NC. Our recent report on the electronic and magnetic properties of rGO:Au-NC 28 focused on sol-gel synthesis, where the Au source was silica-coated Au-NP and the rGO obtained from the modified Hummers method. Our results showed weak agglomeration of particles with a particle size distribution ranging between 10 and 15 nm.…”

Section: Sol-gel Techniquementioning

confidence: 99%

“…XPS analysis showed peaks at $284.7, $285.9, and 286. In the light of their study, our recent report 28 explored the electronic properties of rGO:Au-NP using XPS analysis, as shown in Figure 8. We found a peak at $283.7 eV, which is in proximity to the report of Rani et al…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

“…The impact of GO functionalization with Au could lead to a shift in the peak position of the DOS signifying an increase or decrease in the total DOS. Although there is little analysis of the electronic state of GO:Au being currently available, our recent report 28 explored the shift in the peak position when GO is functionalized with Au (see Figure 9). Firstly, with GO reduction, the prominent peaks are indicated at $10.8, $ 8.6, $7.2, and 6.3 eV which are assigned to a 2s-2p mixed state, 2p-σ state, 2p-σ state, and 2p-σ state, respectively.…”

Section: Ultraviolet Photoelectron Spectroscopymentioning

confidence: 99%

“…26 The induced magnetism and the large surface area properties allow for easy functionalization with surfactants, which could be used for soft magnet applications. 27 Our recent report on rGOfunctionalized silica gold NPs 28 showed weak ferromagnetic/superparamagnetic behaviors, which could be useful for memory device applications and magnetic resonance imaging applications.…”

Section: Introductionmentioning

confidence: 99%

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Graphene oxide/Au nanoparticles: Synthesis, properties, and application: A mini‐review

2021

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There has been rapid growth in research activities on the potential of graphene oxide/Au (GO:Au) composite for different applications. The GO:Au composite has been widely explored in applications such as biomedicine, electrochemical biosensors, optical limiters, and organic dye degradation. The increased interest in GO:Au for these applications is the consequence of harvesting the electronic bonding structure that is due to the formation of sp 3 C C clusters from defected sp 2 C═C and attachment of Au atoms onto the C═C carbon matrix.The defection of the sp 2 cluster of GO can be achieved by the method of improved synthesis and functionalization with Au surfactants. The current review explores an overview of the different synthesis techniques for producing GO:Au composites, which is an important factor in controlling the particle and size distribution of the composites. The electronic, electrical, and magnetic properties of GO:Au composites are covered as it relates to photochemical, memristive, and biomedical imaging applications. The low coercivity and remanence are consistent with superparamagnetic behavior. Although, GO:Aunanocomposite (NC) are widely explored for biomedicine and drug delivery applications, future applications of the composite can be useful for magnetic resonance imaging owing to the superparamagnetic behavior. The future possibilities of GO:Au-NP are promising in the field of bioimaging and electronic devices. The electrical property of GO:Au-NC can be fused with its electrochemical property for supercapacitor applications. In some cases, GO:Au-NC is used as an anchor material with conducting polymers to enhance the supercapacitor properties. Furthermore, the synthesis of mono-disperse few-layer graphene is still challenging owing to economic cost and the graphite exfoliation process. The review of GO:Au composite from a material physics perspective aims to elucidate the current trends as well the future possibilities offered by the composite for various promising applications. Novelty Statement• This review focused on the graphene oxide-gold nanocomposite which is an outstanding composite material for different applications.

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Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

et al. 2021

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Electronic, electrical and magnetic behaviours of reduced graphene-oxide functionalized with silica coated gold nanoparticles

Cited by 30 publications

References 30 publications

Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

Graphene oxide/Au nanoparticles: Synthesis, properties, and application: A mini‐review

Chemical Identification of Catalytically Active Sites on Oxygen‐doped Carbon Nanosheet to Decipher the High Activity for Electro‐synthesis Hydrogen Peroxide

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