Structural, optical and photocatalytic properties of graphene-ZnO nanocomposites for varied compositions

Beura, Rosalin; Thangadurai, P.

doi:10.1016/j.jpcs.2016.11.024

Cited by 85 publications

(19 citation statements)

References 38 publications

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“…Finally, considering that doping of Gr is related to shift of its Fermi level the oxygen treatment can be used to opportunely adapt the energy states of Gr with respect to nearby nanostructures. This aspect has been shown to be of relevant interest for composite systems and could be opportunely used to match the energy level of donor or acceptor states in Gr and in nearby system . Due to the potentialities shown above for doping by thermal treatments in oxygen, this procedure is foreseen to be applicable for the efficient coupling of graphene and composites.…”

Section: Resultsmentioning

confidence: 99%

“…This aspect has been shown to be of relevant interest for composite systems and could be opportunely used to match the energy level of donor or acceptor states in Gr and in nearby system. [85][86][87][88] Due to the potentialities shown above for doping by thermal treatments in oxygen, this procedure is foreseen to be applicable for the efficient coupling of graphene and composites.…”

Section: Resultsmentioning

confidence: 99%

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Graphene‐SiO₂ Interaction from Composites to Doping

Armano

Buscarino

Cannas

et al. 2019

Physica Status Solidi (a)

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An overview of the interaction between monolayer graphene and SiO2 dielectric substrate is reported focusing on the effect this latter has on doping and strain induced by thermal treatments in controlled atmosphere. The disentanglement of strain and doping is highlighted and the comparison with another dielectric substrate of Al2O3 evidences the critical role that the substrate has in the electronic properties of graphene. The reported results pave the way for microelectronic devices based on graphene on dielectrics and for Fermi level tuning in composites of graphene and nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Graphene‐SiO₂ Interaction from Composites to Doping

Armano

Buscarino

Cannas

et al. 2019

Physica Status Solidi (a)

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“…Under visible light irradiation, the photons can be adsorbed to generate electrons (e -) in the conduction band (CB) and holes (h + ) in the valence band (VB) once their energy is greater than the bandgap energy (E g ) of the semiconductor photocatalyst. These photo-generated charge carriers will react with surface molecules (such as H 2 O, adsorbed O 2 ) to undergo secondary reactions to produce radical species (OH, O − 2 ), which further react with the organic compounds and reduce them to harmless products [4,5]. Since the water splitting phenomenon with titanium dioxide (TiO 2 ) and platinum as electrodes was discovered in 1972, semiconductor photocatalysts, such as TiO 2 , CdO, and ZnO, have been widely investigated due to their excellent electronic and optical properties, non-toxicity, and low cost [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

First-Principles Calculations of the Electronic Structure and Optical Properties of Yttrium-Doped ZnO Monolayer with Vacancy

Wang

Liu

et al. 2020

Materials

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The electronic structures and optical characteristics of yttrium (Y)-doped ZnO monolayers (MLs) with vacancy (zinc vacancy, oxygen vacancy) were investigated by the first-principles density functional theory. Calculations were performed with the GGA+U (generalized gradient approximation plus U) approach, which can accurately estimate the energy of strong correlation semiconductors. The results show that the formation energy values of Y-doped ZnO MLs with zinc or oxygen vacancy (VZn, VO) are positive, implying that the systems are unstable. The bandgap of Y-VZn-ZnO was 3.23 eV, whereas that of Y-VO-ZnO was 2.24 eV, which are smaller than the bandgaps of pure ZnO ML and Y-doped ZnO MLs with or without VO. Impurity levels appeared in the forbidden band of ZnO MLs with Y and vacancy. Furthermore, Y-VZn-ZnO will result in a red-shift of the absorption edge. Compared with the pure ZnO ML, ZnO MLs with one defect (Y, VZn or VO), and Y-VZn-ZnO, the absorption coefficient of Y-VO-ZnO was significantly enhanced in the visible light region. These findings demonstrate that Y-VO-ZnO would have great application potential in photocatalysis.

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“…In addition, the active surface sites of graphene sheets prevent the agglomeration of the large-size ZnO particles, and hence increasing the BET surface area [ 63 ]. The improvement of this parameter is beneficial for the photocatalytic performance [ 63 , 64 ] and antimicrobial activity [ 65 ].…”

Section: Resultsmentioning

confidence: 99%

Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers

2021

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The diversity of zinc oxide (ZnO) particles and derived composites applications is highly dependent on their structure, size, morphology, defect amounts, and/or presence of dopant molecules. In this work, ZnO nanostructures are grown in situ on graphene oxide (GO) sheets by an easily implementable solvothermal method with simultaneous reduction of GO. The effect of two zinc precursors (zinc acetate (ZA) and zinc acetate dihydrate (ZAD)), NaOH concentration (0.5, 1 or 2 M), and concentration (1 and 12.5 mg/mL) and pH (pH = 1, 4, 8, and 12) of GO suspension were evaluated. While the ZnO particle morphology shows to be precursor dependent, the average particle size length decreases with lower NaOH concentration, as well as with the addition of a higher basicity and concentration of GO suspension. A lowered band gap and a higher specific surface area are obtained from the ZnO composites with higher amounts of GO suspension. Otherwise, the low concentration and the higher pH of GO suspension induce more lattice defects on the ZnO crystal structure. The role of the different condition parameters on the ZnO nanostructures and their interaction with graphene sheets was observed to tune the ZnO–rGO nanofiller properties for photocatalytic and antimicrobial activities.

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Structural, optical and photocatalytic properties of graphene-ZnO nanocomposites for varied compositions

Cited by 85 publications

References 38 publications

Graphene‐SiO₂ Interaction from Composites to Doping

Graphene‐SiO₂ Interaction from Composites to Doping

First-Principles Calculations of the Electronic Structure and Optical Properties of Yttrium-Doped ZnO Monolayer with Vacancy

Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers

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Structural, optical and photocatalytic properties of graphene-ZnO nanocomposites for varied compositions

Cited by 85 publications

References 38 publications

Graphene‐SiO2 Interaction from Composites to Doping

Graphene‐SiO2 Interaction from Composites to Doping

First-Principles Calculations of the Electronic Structure and Optical Properties of Yttrium-Doped ZnO Monolayer with Vacancy

Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers

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Graphene‐SiO₂ Interaction from Composites to Doping

Graphene‐SiO₂ Interaction from Composites to Doping