Syntheses and Characterizations of Functionalized Graphenes and Reduced Graphene Oxide

문현곤,; 장진해,

doi:10.7317/pk.2011.35.3.265

Cited by 8 publications

(7 citation statements)

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“…In addition, the increase in the broad peak around 24 o due to the amorphous nature caused by substituent, indicating the covalent linkage of the quaternary ammonium group onto GO. 27,28 The humidity-sensitive polyelectrolyte membrane was cast on the electrode surface. The polymer films are liable to crack, swell, shrink, peel off, or break loose from the electrode at repetitive temperature and humidity.…”

Section: Methodsmentioning

confidence: 99%

Preparation of flexible resistive micro-humidity sensors using quaternary ammonium salt-modified graphene oxide and their humidity-sensing properties

Yun

Gong

2014

Macromol. Res.

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A novel resistive-type micro-humidity sensor was constructed from an interdigitated micro-electrode on a flexible polyimide substrate of size 2.0×3.0 mm 2 . The humidity-sensing film was composed of a graphene oxide modified with glycidyltrimethylammonium chloride (GO-GTMAC). We investigate the effect of water adsorption on the electrical properties of GO-GTMAC films using the direct current (DC) measurement and alternating current (AC) complex impedance spectroscopy. The micro-humidity sensor was found to have a sensing range of 0.0268 logΩ/%RH, a linearity of R 2 =0.987, a hysteresis of -1.3±0.2%RH, a response time of 70 s, and a temperature coefficient of 0.50±0.05%RH/°C.

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Section: Methodsmentioning

confidence: 99%

Preparation of flexible resistive micro-humidity sensors using quaternary ammonium salt-modified graphene oxide and their humidity-sensing properties

Yun

Gong

2014

Macromol. Res.

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“…However, the properties of graphene include coagulation because of van der Waals force, and the chemical structure of graphene is stable. Thus, it is hard to disperse graphene in a polymer matrix or in solvents . This decline of dispersion leads to strong void formation or cracks in the polymer/graphene composite, of which both processes decrease the mechanical and physical properties of a material …”

Section: Introductionmentioning

confidence: 99%

Effect of polycarbonate structure and reduction time on graphene oxide dispersion

Lee

Park

Kim

2015

Polymers for Advanced Techs

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Polycarbonate (PC)/graphene oxide (GO) composites with different GO reduction time and PC types were prepared by using a twin screw extruder at 260 °C after solution mixing with chloroform. The chemical reaction degree of PC/GO composites with GO reduction time was confirmed by C–H stretching peak at 3000 cm −1, and the chemical reaction degree decreased with GO reduction time. The slope for storage (G′) versus loss (G″) modulus plot decreases with an increase in heterogeneous property of the polymer melts. So we can check the GO dispersion of the PC/GO composites using by the slop for G′–G″ plot. According to the G′–G″ slopes for PC/GO composite with GO reduction time, GO was well dispersed within PC matrix when the reduction time decreased. It was re‐confirmed by atomic force microscope (AFM) results. Based on the degradation temperature by Thermogravimetric analysis, G′–G″ slopes, and surface roughness by AFM, the branched PC was better than linear PC for the GO dispersion within PC matrix. The fact was also confirmed by tensile test results that the Young's modulus increased with the improvement of GO dispersion. Copyright © 2015 John Wiley & Sons, Ltd.

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“…However, for 10% w / w HDA-GS, the T m of the hybrid film decreased by 17 °C (156 °C). As discussed above, when an excessive amount of the filler was used, the filler was not dispersed in the matrix polymer, and instead agglomerated, thus further decreasing the thermal properties [30]. Finally, the results indicated that the thermal properties differed depending on the type, content, and dispersion of the filler used.…”

Section: Resultsmentioning

confidence: 98%

“…This indicated that the two graphene nanofillers played an important role in enhancing the thermal properties of PVA. Many researchers [30,37,38,39] have reported that the increase in T m is due to the heat shielding effect of the rigid and strong graphene fillers dispersed in the polymer chain, which greatly affects their melting behavior. The DSC thermograms of the PVA hybrids with various HDA-GS contents are shown in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

“…In general, F-GS has its advantages to be an ideal nano-sized filler for polymer nanocomposites: firstly, the F-GS still possess most physical properties of pure graphene even if there are some changes in chemical structure; secondly, the chemical modifying on the surface of GS can enhance the dispersion of GS in the polymer matrix, and also the interfacial interaction between GS and the polymer. In order to improve the dispersibility of the polymer hybrid, a hexadecylamine-graphene sheet containing some oxygen (HDA-GS) was synthesized by a reaction with hexadecylamine (HDA), which resulted in the removal of most of the epoxy groups via deoxygenation [30].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Properties of PVA Nanocomposites Containing Reduced Graphene Oxide and Functionalized Graphene

Park

Chang

2019

Polymers

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The thermal properties, morphologies, oxygen barrier properties, and electrical conductivities of poly(vinyl alcohol) (PVA) hybrid films containing different nanofillers were compared. For the fabrication of the PVA hybrid films, we used reduced graphene oxide (RGO) synthesized from graphite or functionalized hexadecylamine-graphene sheets (HDA-GS) obtained from HDA and GS as a reinforcing filler. The properties of the PVA hybrid films fabricated by intercalating PVA and the fillers for different filler contents ranging from 3 to 10% w/w were then compared. The dispersions of the graphene fillers in the matrix polymers were examined using wide-angle X-ray diffraction and field emission scanning electron microscopy, and the changes in their thermal properties were observed using differential scanning calorimetry and thermogravimetric analysis. Moreover, we measured the oxygen permeability and electrical conductivity of the films to investigate their industrial applications. In addition, all the physical properties of the PVA composites obtained using the two nanofillers were compared.

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Syntheses and Characterizations of Functionalized Graphenes and Reduced Graphene Oxide

Cited by 8 publications

References 0 publications

Preparation of flexible resistive micro-humidity sensors using quaternary ammonium salt-modified graphene oxide and their humidity-sensing properties

Preparation of flexible resistive micro-humidity sensors using quaternary ammonium salt-modified graphene oxide and their humidity-sensing properties

Effect of polycarbonate structure and reduction time on graphene oxide dispersion

Comparison of Properties of PVA Nanocomposites Containing Reduced Graphene Oxide and Functionalized Graphene

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