Study of microwave reduction of graphene oxide suspension: structure and functional groups

Xiang, Xu; Zhu, Ying; Yin, Mingyu; Xia, Shuang; Guo, Chunwen

doi:10.1007/s10853-021-06748-7

Cited by 12 publications

(8 citation statements)

References 44 publications

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“…Similar Fig. 3 FT-IR spectra of Ziziphus spina-christi leaves (Zi), graphene oxide (GO), and reduced graphene oxide (rGO) using 5, 25, and 50 mg mL −1 of Ziziphus spina-christi leaf extract behavior was reported in Xiang et al (2022). This could be preferable in environmental applications due to its easy separation from the aqueous solutions with centrifugation or filtration.…”

Section: Rgo Synthesis Mechanismsupporting

confidence: 70%

“…These issues reflect in the easily self-aggregates of the produced graphene and the limited scalability (Agudosi et al 2020). Another route is the thermal reduction of GO which was applicable in a simple way by applying heat (thermal annealing reduction) (Xiang et al 2022). However, it is not preferable for the mass production of graphene compared to other reduction routes which can be conducted at room temperature or slightly elevated temperature (Jiříčková et al 2022).…”

Section: Introductionmentioning

confidence: 99%

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Biogenic synthesis of reduced graphene oxide from Ziziphus spina-christi (Christ’s thorn jujube) extracts for catalytic, antimicrobial, and antioxidant potentialities

Mahmoud

El-Maghrabi

Hosny

et al. 2022

Environ Sci Pollut Res

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In the current work, various concentrations of the aqueous extract of Ziziphus spina-christi were employed for the phytoreduction of graphene oxide (GO). The green synthesized reduced graphene oxide (rGO) was characterized through UV-Vis spectrometry, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy, and energy-dispersive X-ray spectroscopy (SEM-EDX). Gas chromatography-mass spectrometry (GC-MS) denoted the presence of numerous phytoconstituents including ketones, terpenoids, fatty acids, esters, and flavonoids, which acted as reducing and capping agents. The obtained results indicated the increase in rGO yield and shape with increasing the extract concentration. The optimized rGO was instantaneously ~100% removed methylene blue (MB) from the water at 5 mg L−1. However, the removal efficiency was slightly declined to reach 73.55 and 65.1% at 10 and 15 mg L−1, respectively. A powerful antibacterial activity for rGO particularly against gram-negative bacteria with a high concentration of 2 × 108 CFU mL−1 was confirmed. Furthermore, rGO demonstrated promising and comparable antioxidant efficiency with vitamin C against DPPH free radical scavenging. While vitamin C recorded 13.45 and 48.4%, the optimized rGO attained 13.30 and 45.20% at 12 and 50 μg mL−1, respectively.

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Section: Rgo Synthesis Mechanismsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Biogenic synthesis of reduced graphene oxide from Ziziphus spina-christi (Christ’s thorn jujube) extracts for catalytic, antimicrobial, and antioxidant potentialities

Mahmoud

El-Maghrabi

Hosny

et al. 2022

Environ Sci Pollut Res

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“…The exact structural formula of GO is inconclusive, which is usually expressed in terms of layer number and oxygen content, and is further described in terms of size, defects as well as acidity, etc. [ 8 , 19 ]. It is generally believed that the structure of GO includes a planar structure composed of carbon and oxygen-containing functional groups on the surface [ 8 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…[ 8 , 19 ]. It is generally believed that the structure of GO includes a planar structure composed of carbon and oxygen-containing functional groups on the surface [ 8 , 19 , 20 ]. In graphene, the planar structure of carbon is sp 2 hybrid, while in GO, due to the destruction of C = C bonds caused by oxygen-containing groups, the types of carbon hybrids include not only sp 2 hybrids, but also a large number of sp 3 hybrids.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide composite hydrogels for wearable devices

2022

Self Cite

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For graphene oxide (GO) composite hydrogels, a two-dimensional GO material is introduced into them, whose special structure is used to improve their properties. GO contains abundant oxygen-containing functional groups, which can improve the mechanical properties of hydrogels and support the application needs. Especially, the unique-conjugated structure of GO can endow or enhance the stimulation response of hydrogels. Therefore, GO composite hydrogels have a great potential in the field of wearable devices. We referred to the works published in recent years, and reviewed from these aspects: (a) structure of GO; (b) factors affecting the mechanical properties of the composite hydrogel, including hydrogen bond, ionic bond, coordination bond and physical crosslinking; (c) stimuli and signals; (d) challenges. Finally, we summarized the research progress of GO composite hydrogels in the field of wearable devices, and put forward some prospects.

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“…Various reduction processes may eliminate the functional groups that yield rGO, a conductive material. 6 Commonly used methods to achieve rGO are chemical [7][8][9] and thermal reduction, 6,7,10 reduction using microwave radiation 7,11,12 or plasma reduction. [13][14][15] GO exhibits unique characteristics, high surface area to volume ratio, high electron mobility, good water dispersibility, biocompatibility, and size controllability.…”

Section: Introductionmentioning

confidence: 99%

Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

Pavličková,

Đurđić,

Hatala

et al. 2023

J of Applied Polymer Sci

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Pad printing is not a widely used printing technique, but it offers the possibility of a simple, fast, and low‐cost production of various high‐resolution electrode structures. Here, the pad‐printed reduced graphene oxide (rGO) electrodes are prepared from pad‐printable inks containing rGO powder and different concentrations of two cellulose‐based polymers: ethylcellulose and cellulose acetate butyrate. The applicability of rGO inks for pad printing is analyzed according to their rheological parameters and printability. Based on viscosity, storage (G′) and loss modulus (G″) values, 10 wt% of ethylcellulose and 15 wt% of cellulose acetate butyrate appear to be most suitable for pad printing. The effect of polymer concentration on rGO electrodes homogeneity and mechanical stability is also evaluated. Cyclic voltammetry measurements for [Fe(CN)6]3−/4− redox system are performed with rGO/cellulose inks pad‐printed onto transparent conductive oxide substrates with the best results when using ethylcellulose as a binder. Finally, the square‐wave voltammetric method assesses the viability of rGO electrodes for the fast detection of ascorbic acid (detection limit of 15 μM) coupled with satisfactory precision (4.5%, n = 5) and long‐term stability during electrochemical measurements.

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Study of microwave reduction of graphene oxide suspension: structure and functional groups

Cited by 12 publications

References 44 publications

Biogenic synthesis of reduced graphene oxide from Ziziphus spina-christi (Christ’s thorn jujube) extracts for catalytic, antimicrobial, and antioxidant potentialities

Biogenic synthesis of reduced graphene oxide from Ziziphus spina-christi (Christ’s thorn jujube) extracts for catalytic, antimicrobial, and antioxidant potentialities

Graphene oxide composite hydrogels for wearable devices

Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

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