Statistical analysis of the reduction process of graphene oxide probed by Raman spectroscopy mapping

Wróblewska, Anna; Dużyńska, Anna; Judek, Jarosław; Stobiński, Leszek; Żerańska-Chudek, Klaudia; Gertych, Arkadiusz P.; Zdrojek, Mariusz

doi:10.1088/1361-648x/aa92fe

Cited by 38 publications

(21 citation statements)

References 49 publications

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“…The Raman map of I D /I G , Fig. 3(c) reveals a distribution of GO in the window area with a mean value of 1.23, which is within the reported range, 0.67 to 1.4 31 . However, a trace of darker colour from the map reveals the shape of the underlying ring, indicating a slightly lower I D /I G ratio close to the ring.…”

Section: Resultssupporting

confidence: 71%

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Graphene oxide integrated silicon photonics for detection of vapour phase volatile organic compounds

Tsui

Mao

Alodhayb

et al. 2020

Sci Rep

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the optical response of a graphene oxide integrated silicon micro-ring resonator (GoMRR) to a range of vapour phase Volatile organic compounds (Vocs) is reported. the response of the GoMRR to all but one (hexane) of the VOCs tested is significantly higher than that of the uncoated (control) silicon MRR, for the same vapour flow rate. An iterative Finite Difference Eigenmode (FDE) simulation reveals that the sensitivity of the GO integrated device (in terms of RIU/nm) is enhanced by a factor of ~2, which is coupled with a lower limit of detection. critically, the simulations reveal that the strength of the optical response is determined by molecular specific changes in the local refractive index probed by the evanescent field of the guided optical mode in the device. Analytical modelling of the experimental data, based on Hill-Langmuir adsorption characteristics, suggests that these changes in the local refractive index are determined by the degree of molecular cooperativity, which is enhanced for molecules with a polarity that is high, relative to their kinetic diameter. We believe this reflects a molecular dependent capillary condensation within the graphene oxide interlayers, which, when combined with highly sensitive optical detection, provides a potential route for discriminating between different vapour phase VOCs.

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Section: Resultssupporting

confidence: 71%

“…3(d) confirms this with a mean I D /I G ratio of 1.14 for the GO over the ring. Wroblewska et al previously showed that the I D /I G ratio increases as the GO undergoes thermal reduction 31 . However, the I D /I G ratio is also known to be electrically tuneable 32 , suggesting that it is influenced by localised (trapped) charges, e.g.…”

Section: Resultsmentioning

confidence: 97%

Graphene oxide integrated silicon photonics for detection of vapour phase volatile organic compounds

Tsui

Mao

Alodhayb

et al. 2020

Sci Rep

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“…The G band in the Raman spectra corresponds to sp 2 hybridised carbon-based material [26]. The D peak is related to defect or lattice disorder due to the binding of oxygen-functional group [27]. The intensity of the D band is associated with the size of the sp 2 in-plane domains [26].…”

Section: Discussionmentioning

confidence: 99%

Graphene Oxide in a Composite with Silver Nanoparticles Reduces the Fibroblast and Endothelial Cell Cytotoxicity of an Antibacterial Nanoplatform

et al. 2019

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Antibacterial surfaces coated with nanomaterials, including silver nanoparticles, are considered effective alternative antimicrobial agents that can be used instead of antibiotics and chemical agents. However, reports of the potential toxicity of these materials raise questions about the safety of their use in biomedical applications. The objective of this research was to reduce the human cell cytotoxicity of silver nanoparticle-coated polyurethane foils by complexing silver nanoparticles with graphene oxide. The antimicrobial activity of nanoplatforms coated with silver nanoparticles, graphene oxide and the composite of silver nanoparticles and graphene oxide was assessed with Salmonella enteritidis. Cytotoxicity was analysed by an analysis of the viability and morphology of human fibroblasts, human umbilical vein endothelial cells (HUVECs) and chicken embryo chorioallantoic membrane. Additionally, the synthesis level of inflammatory proteins was examined for fibroblasts cultured on different nanoplatforms. The nanoplatform coated with the silver nanoparticles and graphene oxide composite showed strongest antibacterial properties, although nanoplatforms coated with only silver nanoparticles or graphene oxide also resulted in decreased S. enteritidis growth. Furthermore, a nanoplatform coated with silver nanoparticles and graphene oxide composite showed limited immunological stimulation and significantly reduced cytotoxicity towards fibroblasts, HUVECs and chicken embryo chorioallantoic membrane in comparison to the nanoplatform coated only with silver nanoparticles, due to the higher stability of the nanomaterials in the nanocomposite.

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“…Two main bands were observed in the spectrum: D (1345.9 cm −1 ) and G (1590.5 cm −1 ), in which peak positions and intensity of each band were obtained from Lorentzian fitting. Based on a relative intensity ratio of the D and G modes (I D /I G = 1.20) we confirmed the purity and presence of GO on the optical fiber before covering with a thin layer of PMMA [ 26 ]. The Raman spectra were collected by using a 514 nm laser in a Renishaw inVia spectrometer in ambient conditions.…”

Section: Methodsmentioning

confidence: 64%

UV Sensor Based on Fiber Bragg Grating Covered with Graphene Oxide Embedded in Composite Materials

Lesiak

Bednarska

Małkowski

et al. 2020

Sensors

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Polymer–matrix composites degrade under the influence of UV radiation in the range of the 290–400 nm band. The degradation of polymer–matrix composites exposed to UV radiation is characterized by extensive aging of the epoxy matrix, resulting in deterioration of their mechanical properties. Glass fibers/epoxy resin composites were made by an out-of-autoclave method whereas a fiber optic sensor was placed between different layers of laminates. In our work, we used a fiber Bragg grating sensor covered with graphene oxide and embedded in a polymer matrix composite to monitor UV radiation intensity. Measurements of UV radiation may allow monitoring the aging process of individual components of the polymer composite. In order to estimate the number of microcracks of epoxy resin, microstructure observations were carried out using a scanning electron microscope.

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Statistical analysis of the reduction process of graphene oxide probed by Raman spectroscopy mapping

Cited by 38 publications

References 49 publications

Graphene oxide integrated silicon photonics for detection of vapour phase volatile organic compounds

Graphene oxide integrated silicon photonics for detection of vapour phase volatile organic compounds

Graphene Oxide in a Composite with Silver Nanoparticles Reduces the Fibroblast and Endothelial Cell Cytotoxicity of an Antibacterial Nanoplatform

UV Sensor Based on Fiber Bragg Grating Covered with Graphene Oxide Embedded in Composite Materials

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