Excitation wavelength dependent UV fluorescence of dispersed modified graphene oxide: Effect of pH

Dutta, Partha; Nandi, Debabrata; Datta, Sambit; Chakraborty, Subhajit; Das, Nilimesh; Chatterjee, Shovon; Ghosh, Uday Chand; Halder, Arnab

doi:10.1016/j.jlumin.2015.08.033

Cited by 21 publications

(25 citation statements)

References 39 publications

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“…2a) as obtained by Dutta et al 17 Addition of SDS up to 32 mM to the aqueous GO dispersion, a 36 nm blue shi of the emission band is observed (Fig. 2a).…”

Section: B Absorption Spectrasupporting

confidence: 72%

“…15,16 Although, excitation wavelength dependent emission could come from various functional groups present in GO, as obtained by Thomas et al, 49 gradual red shi in the emission band by the increase in the excitation wavelength at the red end of the absorption spectrum, is not observed for the aqueous dispersion of GO, prepared by us using modied Hummer's method. 17 Teng and co-workers have also found such excitation wavelength independent photoluminescence of GO. 50 According to Gan et al, 51 giant red edge effect may be one of the origin of excitation wavelength dependent photoluminescence of GO quantum dots.…”

Section: B Absorption Spectramentioning

confidence: 87%

“…The uorescence peak of the aqueous dispersion GO is shied from 390 nm to 347 nm by changing the pH of the medium from 2 to 10 is due to increase in interlayer spacing of GO resulting from the repulsion between negatively charged carboxylic acid functional groups at the edge of GO sheets. 17 Apart from this, a small but distinct shoulder around 303 nm is observed in the alkaline medium (Fig. 5a) and this type of low intense PL band may be appeared due to the benzoic acid or phenol like structure.…”

Section: B Absorption Spectramentioning

confidence: 88%

“…17 corresponding to interlayer spacing of 1.11 nm which is higher than interlayer spacing of graphite akes due to the presence of oxygenated functional groups.…”

Section: A Characterization Of Gomentioning

confidence: 96%

“…45,46 C. Fluorescence spectra of GO dispersion Due to the intrinsic inhomogeneity of GO material, the uo-rescence spectra of GO dispersion show interesting features dependent upon the excitation wavelength and pH. 17 We extensively studied the emission characteristics of GO dispersion by exciting the sample at 240 nm (p-p* band) and at 280 nm (n-p* band), varying SDS concentration from 0 to 32 mM in both acidic and alkaline medium. Again, it is well known that the photoluminescence property of GO depends on the layer number, but, the estimation of layer number is not possible by the spectroscopic data.…”

Section: B Absorption Spectramentioning

confidence: 99%

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Effect of an anionic surfactant (SDS) on the photoluminescence of graphene oxide (GO) in acidic and alkaline medium

et al. 2018

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An anionic surfactant (SDS) modulates the photoluminescence of graphene oxide (GO) in both acidic and alkaline medium. In the acidic medium (pH z 2), formation of hemi spherical surface micelles on the GO sheets creates a non-polar environment around the flourophoric moiety of GO and hinders the solvent relaxation. This leads to a significant 36 nm blue shift of the photoluminescence band, whereas in alkaline medium (pH z 10), SDS interacts with GO sheets in a different way due to the presence of negatively charged carboxylate ions at the GO edges. The repulsion between the negatively charged GO sheets and the intercalation of SDS within the basal planes of GO may weaken p-p stacking interaction which produces largely separate layers of GO. The largely separated GO sheets due to very weak stacking interactions among successive layers may behave almost like isolated functionalized GO, resulting in an enhancement of the photoluminescence intensity at 303 nm.

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“…2a) as obtained by Dutta et al 17 Addition of SDS up to 32 mM to the aqueous GO dispersion, a 36 nm blue shi of the emission band is observed (Fig. 2a).…”

Section: B Absorption Spectrasupporting

confidence: 72%

Section: B Absorption Spectramentioning

confidence: 87%

Section: B Absorption Spectramentioning

confidence: 88%

“…17 corresponding to interlayer spacing of 1.11 nm which is higher than interlayer spacing of graphite akes due to the presence of oxygenated functional groups.…”

Section: A Characterization Of Gomentioning

confidence: 96%

Section: B Absorption Spectramentioning

confidence: 99%

See 3 more Smart Citations

Effect of an anionic surfactant (SDS) on the photoluminescence of graphene oxide (GO) in acidic and alkaline medium

et al. 2018

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Tuning of Photoluminescence of Graphene Oxide Based Nanomaterials in the UV‐Visible Region: Formation of Aggregates by H‐Bonding through Water Molecules

et al. 2022

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To investigate the interaction among the graphene oxide layers by involving surface functional groups, photoluminescence (PL) from graphene oxide (GO), and hydroxyl enriched graphene oxide (OH-GO) in the UV-visible region are studied. Tuning of PL is observed by varying the concentration of aqueous dispersion of OH-GO, obtained by strong alkaline treatment on graphene oxide (GO). FTIR, Raman, XRD, and the microscopic study suggests the structural orderness of the OH-GO compared to GO. Hydroxyl functional groups at the surface of OH-GO facilitate the formation of aggregates through hydrogen bonds by involving solvent water molecules and the PL band in the visible region may be originated from such aggregates. With the increase in the concentration of OH-GO in the aqueous medium, the contribution of the visible PL band is markedly increased along with the decrease in the PL band in the UV region. The time-resolved study indicates the possibility of energy transfer from the species emitting in the UV region to the species emitting in the visible region. This energy transfer may be responsible for the marked enhancement of the visible band of the PL spectra of OH-GO at high concentrations.

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Complete valorization of bamboo biomass into multifunctional nanomaterials by reactive deep eutectic solvent pretreatment: Towards a waste-free biorefinery

Sun

Zhang

et al. 2023

Chemical Engineering Journal

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Excitation wavelength dependent UV fluorescence of dispersed modified graphene oxide: Effect of pH

Cited by 21 publications

References 39 publications

Effect of an anionic surfactant (SDS) on the photoluminescence of graphene oxide (GO) in acidic and alkaline medium

Effect of an anionic surfactant (SDS) on the photoluminescence of graphene oxide (GO) in acidic and alkaline medium

Tuning of Photoluminescence of Graphene Oxide Based Nanomaterials in the UV‐Visible Region: Formation of Aggregates by H‐Bonding through Water Molecules

Complete valorization of bamboo biomass into multifunctional nanomaterials by reactive deep eutectic solvent pretreatment: Towards a waste-free biorefinery

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