Investigation of Raman and photoluminescence studies of reduced graphene oxide sheets

Krishnamoorthy, Karthikeyan; Veerapandian, Murugan; Mohan, Rajneesh; Kim, Sang‐Jae

doi:10.1007/s00339-011-6720-6

Cited by 315 publications

(173 citation statements)

References 25 publications

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“…15,26 The wavelength of maximum absorbance for graphene oxide was found at 235 nm, which corresponds to the characteristic π-π* electron transitions of the aromatic C-C bonds. 16,26 As shown in Figure S1A, MPHs in their normal state have a λ max at 418 nm, in agreement with previous reports for MPHs. [23][24][25] Surface functionalization of graphene oxide with MPHs resulted in a shifted peak at 424 nm with a broadened shape (see Figure 1B).…”

Section: Resultssupporting

confidence: 92%

“…The Raman spectrum of graphene oxide showed a characteristic G band at 1595.7 cm −1 assigned to the E 2 g phonon mode of sp 2 -hybridized carbon atoms, and a D-band at 1345.7 cm −1 assigned to the vibrations of carbon atoms with dangling bonds in plane terminations of disordered graphite, particularly at the edges. 15,16,25 After functionalization of graphene oxide by silanized MPHs, the D bands and G bands were blue-shifted at 1339.8 cm −1 and 1591.2 cm −1 , respectively. Furthermore, the D peak intensity (I (D) ) was increased in the FGO spectrum compared with that for normal graphene oxide, indicating that our functionalization process had modified the lattice structure of the graphene oxide sheets.…”

Section: Resultsmentioning

confidence: 99%

“…[14][15][16][17] The unique two-dimensional sheet-like nanostructure, high surface-tovolume ratio, and physicochemical properties of graphene oxide make it a promising candidate for constructing electrochemical sensors and biosensors. According to the widely accepted Lerf-Klinowski model, graphene oxide platelets have chemically reactive oxygen functionality, including carboxylic acid groups at their edges and epoxy and hydroxyl groups on the basal planes.…”

Section: Introductionmentioning

confidence: 99%

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Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Veerapandian¹,

Seo²,

Shin³

et al. 2012

IJN

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Abstract:A novel clinical glucose biosensor fabricated using functionalized metalloid-polymer (silver-silica coated with polyethylene glycol) hybrid nanoparticles on the surface of a graphene oxide nanosheet is reported. The cyclic voltammetric response of glucose oxidase modification on the surface of a functionalized graphene oxide electrode showed a surface-confined reaction and an effective redox potential near zero volts, with a wide linearity of 0.1-20 mM and a sensitivity of 7.66 µA mM. The functionalized graphene oxide electrode showed a better electrocatalytic response toward oxidation of H 2 O 2 and reduction of oxygen. The practical applicability of the functionalized graphene oxide electrode was demonstrated by measuring the peak current against multiple urine and serum samples from diabetic patients. This new hybrid nanoarchitecture combining a three-dimensional metalloid-polymer hybrid and two-dimensional graphene oxide provided a thin solid laminate on the electrode surface. The easy fabrication process and retention of bioactive immobilized enzymes on the functionalized graphene oxide electrode could potentially be extended to detection of other biomolecules, and have broad applications in electrochemical biosensing.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Veerapandian¹,

Seo²,

Shin³

et al. 2012

IJN

Self Cite

View full text Add to dashboard Cite

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“…The peak observed for GO at 230 nm (spectrum (A)) represents the - * transitions of C-C aromatic ring, while the shoulder at 308 nm corresponds to - * transition of C=O bond [38,39]. In case of f-MWCNTs the absorption peak observed at ∼260 nm (spectrum (B)) is attributable to the - * transitions of f-MWCNTs [40,41].…”

Section: Spectroscopic Characterizationmentioning

confidence: 99%

Graphene-Multiwalled Carbon Nanotube Hybrids Synthesized by Gamma Radiations: Application as a Glucose Sensor

Shahriary

Ghourchian

Athawale

2014

Journal of Nanotechnology

119

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Three-dimensional hybrid nanomaterial of graphene-multiwalled carbon nanotubes (G-MWCNTs) was synthesized using gamma rays emitted by a60Co source with a dose rate of 3.95 Gy min−1. The products were characterized by fourier transform infrared (FTIR), ultraviolet-visible (UV-Vis), photoluminescence (PL), and micro-Raman spectroscopy, X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). FTIR and UV-Vis analysis reveals the formation of hybrid nanomaterial which is confirmed by XRD, micro-Raman analysis, and PL. SEM micrograph depicts the composite structure of graphene layers and MWCNTs, while the TEM micrograph exhibits graphene layers covered by MWCNTs. The G-MWCNTs hybrid used as electrode for electrochemical studies in K3Fe(CN)6shows enhancement in electrocatalytic behavior, compared to each individual starting material, therefore, has been applied for amperometric sensing of glucose in alkaline solution and exhibits sensitivity of 12.5 μAmM-1 cm−2and low detection limit 1.45 μM (S/N=3) in a linear range of 0.1 to 14 mM (R2=0.985).

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“…Ideal graphene is a zero bandgap semiconductor that contains sp 2 clusters which are not favorable for luminescence application [2]. Like graphene, graphene oxide (GO) is formed by the oxidation of graphite, with still sp 2 carbon atoms in its structure [3]. Meanwhile, reduced graphene oxide (rGO) is the loss of oxygen and hydrogen atoms in the structures that resemble graphene.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of Reduced Graphene Oxide Prepared from Old Coconut Shell with Carbonization Process at Varying Temperatures

Jayanti

Nugraheni

Kurniasari

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Reduced graphene oxide (rGO) powder has been prepared from coconut shells by carbonization process at 400 o C, 600 o C, 800 o C and 1000 o C for 5 hours at ambient air. In this study the exfoliation rGO was added into distilled water with variation of concentration solution using the sonication process for 3 hours and centrifugation at 4000 rpm for 20 minutes. The characterization were performed by using XRD and photoluminescence (PL) spectroscopy. The photoluminescence or rGO showed the peak of excitation and emission at wavelengths ranging from 340 nm to 800 nm. The PL emission spectra are at wavelength ranging from UV to visible region approaching red. Observation showed that the photoluminescence intensity was significantly increased by the increasing content of rGO in the solution. The influence of the varying temperature on the PL spectra will also be discussed in this study.

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Investigation of Raman and photoluminescence studies of reduced graphene oxide sheets

Cited by 315 publications

References 25 publications

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Graphene-Multiwalled Carbon Nanotube Hybrids Synthesized by Gamma Radiations: Application as a Glucose Sensor

Photoluminescence of Reduced Graphene Oxide Prepared from Old Coconut Shell with Carbonization Process at Varying Temperatures

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