Optical properties of graphene oxide and reduced graphene oxide determined by spectroscopic ellipsometry

Schöche, S.; Hong, Nina; Khorasaninejad, Mohammadreza; Ambrosio, Antonio; Orabona, Emanuele; Maddalena, Pasqualino; Capasso, Federico

doi:10.1016/j.apsusc.2017.01.035

Cited by 120 publications

(64 citation statements)

References 41 publications

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“…Biomass carbon was oxidized with harsh treatment using dipermanganate heptaoxide (Mn 2 O 7 ). This species was intercalated into the biomass carbon layer with functionalized oxygen groups among the layers . The ratio of oxygen functionalities must be controlled to provide vacancies or sites for anchoring auxiliary metals or atoms.…”

Section: Resultsmentioning

confidence: 99%

“…This species was intercalated into the biomass carbon layer with functionalized oxygen groups among the layers. 34,35 The ratio of oxygen functionalities must be controlled to provide vacancies or sites for anchoring auxiliary metals or atoms. As concluded from the characterization, pyrolysis at 900 C resulted in RGO with many defect sites, few oxygen-containing groups, sheet-like morphology, and high graphitization, and thus, this was selected as the fixed temperature for catalyst preparation.…”

Section: Physicochemical and Electrochemical Characterizationsmentioning

confidence: 99%

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Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

et al. 2019

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Summary Reduced graphene oxide (RGO) has progressed as one of key emerging carbon for catalyst support material. As an alternative to the conventional RGO precursor, biomass Sengon wood was converted into RGO for use as a noble metal free catalyst support in oxygen reduction reaction (ORR). This work intends to reveal the applicability of Sengon wood‐derived RGO in anchoring/doping iron and nitrogen particles onto its surface and to study its ORR performance in a half‐cell environment. Thin‐sheet layer and highly defective (ID/IG) was gradually obtained at elevated pyrolysis temperature of Sengon wood graphene oxide (GO) at range 700°C to 900°C. As prepared RGO was further doped into catalyst (Fe/N/RGO) through the same pyrolysis procedure at a selected temperature after mixing the GO powder with iron chloride and different nitrogen precursors (urea, choline chloride, and polyaniline) at a fixed ratio. The ORR activity reached a current density up to 2.43 mA/cm2, which in conjunction with smooth multilayer sheet morphology and high graphitic‐N content as the active sites. Stability analysis indicated an 85% current efficiency and only 0.03 V reduction in onset potential on methanol resistant test for Fe/ChoCl/RGO catalyst. This study revealed that Sengon wood‐derived RGO successfully supported Fe‐N‐C catalyst which showed comparable oxygen reduction activity to Pt/C.

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Section: Resultsmentioning

confidence: 99%

Section: Physicochemical and Electrochemical Characterizationsmentioning

confidence: 99%

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

et al. 2019

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“…A quantitative working standard solution of Mn(II), Cr(III) and Pb(II) (500.0 μg ⋅L −1 ) 1.0 and 2.0 mL NH 3 ⋅H 2 O-NH 4 Cl pH buffer were added into a centrifuge tube. Then diluted to 10.0 mL with high purity water.…”

Section: Adsorption and Elution Methodsmentioning

confidence: 99%

Graphene‐grafted silica‐coated Fe₃O₄ nanoparticles as a magnetic solid‐phase extraction material coupled with inductively coupled plasma optical emission spectroscopy for the separation and analysis of heavy metal ions

Zhu

2018

Separation Science Plus

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A novel method using graphene‐grafted silica‐coated Fe3O4 nanoparticles (Fe3O4‐SiO2‐G) as a magnetic solid adsorbent coupled with inductively coupled plasma atomic emission spectrometry for the separation and analysis of Mn(II), Cr(III), Pb(II) was developed. The introduction of graphene into Fe3O4‐SiO2 increased the selectivity and adsorption capacity of the developed material. The successful immobilization of graphene on the Fe3O4‐SiO2 was confirmed by X‐ray diffraction, transmission electron microscopy, size distribution and magnetic analysis and isoelectric point analysis. It was found that Mn(II), Cr(III), and Pb(II) could be determined with very good adsorption efficiencies (96.8, 100.0, 100.0%) on Fe3O4‐SiO2‐G. The limits of detection for the three metal ions were in the range of 0.076–0.922 ng ·L−1, and the linear range was 5.0–90.0 μg L−1 for Mn(II), 4.0–90.0 μg ·L−1 for Cr(III) and 5.0–90.0 μg ·L−1 for Pb(II). The enrichment factors of Mn(II), Cr(III), and Pb(II) were 80, 20, and 35, respectively. The developed method was successfully applied to the determination of Mn(II), Cr(III), and Pb(II) in real samples.

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“…Graphene, a sp 2 ‐bonded two‐dimensional carbon based nanomaterial has attracted tremendous attentions due to its extraordinary properties such as a large theoretical specific surface area, superior mechanical strength, and high thermal/chemical stability . Graphene oxide (GO) consists of oxidized graphene sheets which are decorated with epoxy, hydroxyl, carbonyl, and other oxygen containing functional groups . The presence of these groups provides a unique capacity for attachment of other nanomaterials and introducing different functional groups on the surface of GO that can be designed as anchoring sites to form complex with metal ion .…”

Section: Introductionmentioning

confidence: 99%

Optimization of cadmium adsorption from aqueous solutions by functionalized graphene and the reversible magnetic recovery of the adsorbent using response surface methodology

Jafaryan

Sadjadi

Gharib

et al. 2019

Applied Organom Chemis

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Novel functionalized graphene adsorbent was prepared and characterized using different techniques. The prepared adsorbent was applied for the removal of cadmium ions from aqueous solution. A response surface methodology was used to evaluate the simple and combined effects of the various parameters, including adsorbent dosage, pH, and initial concentration. Under the optimal conditions, the cadmium removal performance of 70% was achieved. A good agreement between experimental and predicted data in this study was observed. The experimental results revealed of cadmium adsorption with high linearity follow Langmuir isotherm model with maximum adsorption capacity of 502 mg g−1, and the adsorption data fitted well into pseudo‐second order model. Thermodynamic studies showed that adsorption process has exothermic and spontaneous nature. The recommended optimum conditions are: cadmium concentration of 970 mg L−1, adsorbent dosage of 1 g L−1, pH of 6.18, and T = 25 °C. The magnetic recovery of the adsorbent was performed using a magnetic surfactant to form a noncovalent magnetic functionalized graphene. After magnetic recovery of the adsorbent both components (adsorbent and magnetic surfactant) were recycled by tuning the surface charges through changing the pH of the solution. Desorption behavior studied using HNO3 solution indicated that the adsorbent had the potential for reusability.

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Optical properties of graphene oxide and reduced graphene oxide determined by spectroscopic ellipsometry

Cited by 120 publications

References 41 publications

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

Graphene‐grafted silica‐coated Fe₃O₄ nanoparticles as a magnetic solid‐phase extraction material coupled with inductively coupled plasma optical emission spectroscopy for the separation and analysis of heavy metal ions

Optimization of cadmium adsorption from aqueous solutions by functionalized graphene and the reversible magnetic recovery of the adsorbent using response surface methodology

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Optical properties of graphene oxide and reduced graphene oxide determined by spectroscopic ellipsometry

Cited by 120 publications

References 41 publications

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

Graphene‐grafted silica‐coated Fe3O4 nanoparticles as a magnetic solid‐phase extraction material coupled with inductively coupled plasma optical emission spectroscopy for the separation and analysis of heavy metal ions

Optimization of cadmium adsorption from aqueous solutions by functionalized graphene and the reversible magnetic recovery of the adsorbent using response surface methodology

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Product

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Graphene‐grafted silica‐coated Fe₃O₄ nanoparticles as a magnetic solid‐phase extraction material coupled with inductively coupled plasma optical emission spectroscopy for the separation and analysis of heavy metal ions