Optical Properties of Composites Based on Graphene Oxide and Polystyrene

Stroe, Malvina; Cristea, Mirela; Matei, Elena; Galaţanu, A.; Cotet, Liviu Cosmin; Pop, Lucian Cristian; Baia, Monica; Danciu, Virginia; Anghel, Ion; Baia, Lucian; Baibarac, M.

doi:10.3390/molecules25102419

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…The peaks in the range of 2000–1660 cm −1 can be attributed to monosubstituted benzene rings. The rest of the bands belong to the stretching and torsional vibrations of the C–H bonds (3081, 3058, 3025, 1069, 1028, 758, 700 cm −1 ) [ 41 ]. The difference FTIR spectrum of the composite and the PS matrix ( Figure 4 e) demonstrates only the presence of weak signals in the region of the TMSPM absorption bands [ 14 ].…”

Section: Resultsmentioning

confidence: 99%

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

et al. 2021

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This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. The magnetization of the composites under investigation and their components was measured using a vibrating-sample magnetometer. It has been shown that the UV-reduction process leads to the formation of many submicron holes distributed inside rGO flakes, which can create edge defects, causing possibly magnetic order in the graphite samples under investigation on the mesoscopic level. This article provides an alternative explanation for the ferromagnetic hysteresis loop in UV-rGO on the base of superconductivity type-II.

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Section: Resultsmentioning

confidence: 99%

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

et al. 2021

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“…These changes must be understood in terms of the appearance of some of the ClCH=CH–, CH 2 =CCl–, and/or –CH=CCl– units as a result of the partial dehydrogenation of the PVC macromolecular chains, as shown in Scheme 1 . As shown in our previous study, the main IR bands of the GO sheets are situated at 1032, 1163, 1212, 1414, 1599, 1724, and 3594 cm −1 , and they are assigned to the vibrational mode of the stretching of C=C bonds, C–O in the ether group, OH groups, the deformation of OH and COOH groups, H 2 O molecules on the GO sheet surfaces, the stretching of C=O in COOH and CHO groups, and the stretching OH in the free H 2 O molecules, respectively [ 16 , 28 ]. According to Figure 4 c,d, as the GO sheet concentration in the PVC/GO composite mass increases, the following can be observed: (i) an increase in the absorbance of IR bands peaking at 1776 and 3319 cm −1 ; (ii) a change in the ratio of the absorbances of the bands localized in the spectral ranges of 600–750 and 2750–3250 cm −1 with the maxima of IR bands of high absorbance at 611 and 2920 cm −1 , from 1.28 (black curve in Figure 4 c) to 0.36 (blue curve in Figure 4 c) when the GO concentration is equal to 0 and 5 wt.%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…An oxidative–exfoliation method in the presence of 74.7 mL H 2 SO 4 85 wt.% and 8.3 mL H 3 PO 4 85% was used for the preparation of the GO sheets [ 14 , 15 ]. Detailed information about this method can be found in our previous studies [ 14 , 15 , 16 ]. In brief, graphite powder was sonochemical exfoliated using H 2 SO 4 as solvent medium, KMnO 4 as the oxidant agent, and H 3 PO 4 as the protective agent against excessive oxidation.…”

Section: Methodsmentioning

confidence: 99%

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Poly(Vinyl Chloride) Spheres Coated with Graphene Oxide Sheets: From Synthesis to Optical Properties and Their Applications as Flame-Retardant Agents

et al. 2021

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A new method to obtain poly(vinyl chloride) (PVC) spheres, which consists of an interaction between commercial PVC grains and hexyl ethyl cellulose and lauroyl peroxide at a temperature of 60 °C, is reported. The addition of the graphene oxide (GO) sheets dispersed in dimethylformamide to the reaction mixture leads to the generation of composites made of PVC spheres coated with GO sheets. Scanning electron microscopy studies have demonstrated that this method allows for the transformation of PVC grains with sizes between 75 and 227 μm into spheres with sizes varying from 0.7 to 3.5 μm when the GO concentration in the PVC/GO composite mass increases from 0.5 to 5 wt.%. Our studies of Raman scattering and FTIR spectroscopy highlight a series of changes that indicate the appearance of ClCH=CH–, CH2=CCl–, and/or –CH=CCl– units as a result of PVC partial dehydrogenation. New –COO– and C–OH bonds on the GO sheet surfaces are induced during the preparation of PVC spheres coated with GO sheets. A photoluminescence (PL) band with a maximum at 325 nm is reported to characterize the PVC spheres. A PVC PL quenching process is demonstrated to be induced by the increase in the concentration of the GO sheets in the PVC/GO composite mass. The perspectives regarding the use of this composite as a flame-retardant material are also reported.

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“…Recent studies have shown significant improvements in graphene properties by doping it with different heteroatoms such as Florine (F), Oxygen (O) [ 15 ], Nitrogen (N) [ 16 ], and Boron (B) [ 17 ]. The boron-doped graphene oxide has been reported in various applications such as supercapacitor [ 18 ], Li-ion batteries [ 19 ], solar cells [ 20 ], and the enhanced photogenerated catalysis [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Boron-Doped Reduced Graphene Oxide with Tunable Bandgap and Enhanced Surface Plasmon Resonance

et al. 2020

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Graphene and its hybrids are being employed as potential materials in light-sensing devices due to their high optical and electronic properties. However, the absence of a bandgap in graphene limits the realization of devices with high performance. In this work, a boron-doped reduced graphene oxide (B-rGO) is proposed to overcome the above problems. Boron doping enhances the conductivity of graphene oxide and creates several defect sites during the reduction process, which can play a vital role in achieving high-sensing performance of light-sensing devices. Initially, the B-rGO is synthesized using a modified microwave-assisted hydrothermal method and later analyzed using standard FESEM, FTIR, XPS, Raman, and XRD techniques. The content of boron in doped rGO was found to be 6.51 at.%. The B-rGO showed a tunable optical bandgap from 2.91 to 3.05 eV in the visible spectrum with an electrical conductivity of 0.816 S/cm. The optical constants obtained from UV-Vis absorption spectra suggested an enhanced surface plasmon resonance (SPR) response for B-rGO in the theoretical study, which was further verified by experimental investigations. The B-rGO with tunable bandgap and enhanced SPR could open up the solution for future high-performance optoelectronic and sensing applications.

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Optical Properties of Composites Based on Graphene Oxide and Polystyrene

Cited by 15 publications

References 30 publications

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

Poly(Vinyl Chloride) Spheres Coated with Graphene Oxide Sheets: From Synthesis to Optical Properties and Their Applications as Flame-Retardant Agents

Boron-Doped Reduced Graphene Oxide with Tunable Bandgap and Enhanced Surface Plasmon Resonance

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