Synthesis and characterization of chemically exfoliated graphene oxide

Vanasundaram, N; Ahamed, Muneer; Kumar, Praveen

doi:10.1063/1.5122385

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Graphene oxide was synthesized by using Improved Hummer's method [5,25]. The freshly synthesized GO was dissolved and then ultrasonicated (1 h) for exfoliation in their solutions.…”

Section: Growth Of Cds/rgo Filmsmentioning

confidence: 99%

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

Vanasundaram

Ahmad

Chaudhary

et al. 2020

Mater. Res. Express

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The growth of reduced graphene oxide (rGO) based semiconductor nanohybrids through simple, scalable, additive-free and cost-effective route has fascinated significant attention of researchers for both fundamental research areas and its commercial applications. In the present work, cadmium sulphide/reduced graphene oxide (CdS/rGO) films were sequentially or layer-by-layer (LBL) deposited by spin coating method. The samples were characterized by using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-visible spectroscopy, Raman spectra and Hall measurements. The cubic phase of the CdS and formation of rGO was confirmed by XRD measurements. The FESEM micrographs elucidate a change in morphological features with rGO content in CdS/rGO nanohybrid films. The Raman spectra indicate the characteristic features for nanostructured CdS and rGO in these samples. Optical transmission is found to increase along with a decrease in optical gap with rGO content. Hall measurements showed the change in the majority carrier concentration with rGO content or the observation of surface charge transfer doping (SCTD) in these nanocomposites. The change in dispersion of refractive index with rGO content for CdS/rGO nanocomposites in terahertz (THz) spectral region has been observed. These results are very important for the development of new functionality of nanohybrid materials for emerging technologies.

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“…Graphene oxide was synthesized by using Improved Hummer's method [5,25]. The freshly synthesized GO was dissolved and then ultrasonicated (1 h) for exfoliation in their solutions.…”

Section: Growth Of Cds/rgo Filmsmentioning

confidence: 99%

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

Vanasundaram

Ahmad

Chaudhary

et al. 2020

Mater. Res. Express

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Enhanced photocatalytic efficiency of sol-gel derived ZnS-rGO binary nanocomposite

Kumari,

Sharma,

Mishra

et al. 2024

Phys. Scr.

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A facile chemical route of synthesis of ZnS-rGO binary nanocomposites is reported here. The efficacy of such nanocomposites as a photocatalyst in degrading the common pollutant dye such as Methylene blue (MB), has been thoroughly investigated and the underlying mechanism is also presented. The standard characterization methods were applied to understand the structure, bonding, morphology, optical and elemental compositions. The results indicated that the ZnS nanoparticles were well dispersed into the rGO nanosheets which due to their 2-D sheet structure, served as a favourable template for growth and control of morphology. Increase in rGO amount showed a direct impact on particle size confirmed by XRD and Raman both. The synthesized nanocomposites were utilized as photocatalyst for the degradation of MB dyes under UV irradiation. The optimal combination of ZnS and rGO (in the ratio of 3:2) exhibited enhanced photocatalytic activity. A higher rate constant of 7.01×10−3 min−1, and an approximate degradation efficiency of 75% were obtained after 90 mins of degradation. The improvement in photocatalytic activity can be attributed to the enhancement in charge separation, suppressed recombination of electron-hole (e-–h+) carriers, and a possible longer electron lifetime due to the presence of higher amount of rGO. Here, rGO assisted the suppression of charge recombination process in ZnS-rGO and ignited hydroxyl radicals and super-oxide ions which further accelerated the degradation rate of dye. Based on the nature of the dye and its concentration, a significant amount of rGO was needed to maximize the photocatalytic efficiency of ZnS-rGO binary nanocomposites. In addition, the dark current variation with applied bias was explored and it depicted a reduction in dark current with optimized amount of rGO in nanocomposite. The nanocomposites have a strong potential to be utilized in water purification and nano-detectors.

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Synthesis and characterization of chemically exfoliated graphene oxide

Cited by 2 publications

References 17 publications

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

Enhanced photocatalytic efficiency of sol-gel derived ZnS-rGO binary nanocomposite

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