Synergistic effect of UV and l-ascorbic acid on the reduction of graphene oxide: Reduction kinetics and quantum chemical simulations

Go, Su-Hyeon; Yu, Jaesang; You, Nam‐Ho; Kim, Young‐Kwan

doi:10.1016/j.solidstatesciences.2018.09.001

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…Since graphene oxide has relatively lower absorbance at the visible NUV light range (400--405 nm) than UV light, this means that NUV light can reach deeper into the film and partially reduce the graphene oxide in the center layers of the film up to a certain depth [89]. Go et al [90] have shown through UV-Vis that UV light is capable of reducing graphene oxide at a similar rate as L-AA alone; however, these experiments were done using 252 nm UVradiation which can lead to some discrepancies since GO has a greater absorption at that particular wavelength.…”

Section: Discussionmentioning

confidence: 99%

“…The low impact of NUV exposure alone is likely caused by the reduction of the film's surface. As the film was irradiated and reduced, graphene oxide began absorbing more light at 405 nm wavelength [90] until reaching a point where the effects of NUV light were negligible. After this point, only the solution that has entered the inner layers of the film through gaps furthered the reduction.…”

Section: Discussionmentioning

confidence: 99%

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Near-UV light assisted green reduction of graphene oxide films through l-ascorbic acid

Regis

Vargas

Irigoyen

et al. 2021

International Journal of Smart and Nano Materials

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Recent studies have highlighted the effects of various stimuli on the chemical reduction of graphene oxide (GO) through green reductant L-ascorbic acid (L-AA); however, the combination of near ultraviolet (NUV) light to increase the reduction rate has yet to be thoroughly explored. In this study, drop-casted GO films were subjected to chemical reduction through L-AA with various levels of exposure under 405 nm NUV radiation. The structure and uniformity of GO stackings that form the film were characterized through scanning electron microscopy (SEM) and wide-angle x-ray scattering (WAXS). Additionally, WAXS was used to track the removal of oxygencontaining functional groups along with Fourier-transform infrared (FT-IR) spectroscopy and x-ray photoelectron spectroscopy (XPS) as a function of L-AA and NUV light exposure times. XPS results demonstrated that the interaction between L-AA and NUV exposure has a significant effect on the reduction of films. Furthermore, the results that yielded the highest reduction (C-C bond concentration of 60.7%) were the longest L-AA and NUV light exposure times (48 hours and 3 hours, respectively). This report provides a study on the effects of NUV on the green reduction of GO films through L-AA with potential application in solar energy and chemical sensing applications.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Near-UV light assisted green reduction of graphene oxide films through l-ascorbic acid

Regis

Vargas

Irigoyen

et al. 2021

International Journal of Smart and Nano Materials

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“…It suggested that the carboxyl group was reduced to the hydroxyl group, possibly indicating an incomplete reduction of the IGGO. Several distinct peaks of IGGO are observed, such as C-H (at 2927 cm −1 , low-intensity stretching and bending vibrations), C=O (at 1727 cm −1 , stretching vibration of carboxyl groups), C=C (at 1600 cm −1 and 1380 cm −1 , vibration of the graphene skeleton), and C-O-C (at 1050 cm −1 , stretching vibration of epoxy groups) [45,46]. After the self-hydrothermal reduction of rGOA-0, the intensities of the peaks at 1727 cm −1 (C=O stretching vibration) and 1050 cm −1 (C-O-C stretching vibration) are weakened to a certain extent, illustrating that incomplete reduction takes place.…”

Section: Scanningmentioning

confidence: 99%

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

Zheng

Hou

et al. 2021

Applied Sciences

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Volatile methyl siloxanes (VMSs) as a trace impurity in biogas decreases its energy utilization, and thus need to be removed. In this paper, a one-step hydrothermal reduction was performed to produce three-dimensional reduced graphene oxide aerogels (rGOAs) using industrial-grade graphene oxide (IGGO) as raw material and vitamin C (VC) as a reductant to facilitate the fabrication of rGOAs. The synthesis of rGOAs was a simple, green, and energy-efficient process. The developed rGOAs were characterized using the Brunauer–Emmett–Teller method, Raman spectrometry, scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction measurements and contact angle. The results obtained showed that rGOA-1 with a VC/IGGO ratio of 1/1 (m/m) exhibited a hierarchical porous structure and super-hydrophobicity, yielding a high specific surface area (137.9 m2 g−1) and superior water contact angle (143.8°). The breakthrough adsorption capacity of rGOA-1 for hexamethyldisiloxane (L2, a VMS model) was 11 times higher than that of IGGO. Low inlet concentration and bed temperature were considered beneficial for the L2 adsorption. Interestingly, rGOA-1 was less sensitive to water, and it was readily regenerated for reuse by annealing at 80 °C. The rGOAs have been demonstrated to have great potential for the removal of siloxanes from biogas.

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“…Availability of many reduction methods such as thermal and chemical ways can produced various quality of RGO that can be assessed by the amount of carbon to oxygen (C:O) ratio [6], preference for removal of each oxygen functional groups [7], surface defects [8], and reducing agent selection [9]. In chemical reduction of GO, hydrazine's hazard can be avoided by employing green reductants such as ascorbic acid [10,11], green tea [12], and various plant extract [13]. It was found that RGO by ascorbic acid (AA, a form of vitamin C) produced comparable structural quality to those synthesised by hydrazine [14].…”

Section: Introductionmentioning

confidence: 99%

Comparison study between two different precursors of RGO/AuNPs one pot synthesis

Kasim,

Halim,

Ong

et al. 2024

Adv. Nat. Sci: Nanosci. Nanotechnol.

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One pot synthesis of graphene nanocomposites is low-cost and time-efficient methodology to be considered for large scale device fabrication. Graphene precursors made of renewable and waste materials such as rice husk, oil palm kernel and sugar are explored upon rising concern of expensiveness and hazard in conventional approaches. This paper presents chemical characterisation study of one pot reduced graphene oxide/gold nanoparticles (RGO/AuNPs) synthesised from low-cost sucrose as precursor and dehydroascorbic acid as green reducing agent at ambient condition which was originally used by Hurtado et al in 2020. Raman spectrum of RGO/AuNPs was compared to composite of commercial GO precursor to evaluate quality of reduction products. Result from UV–vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS) showed that both techniques successfully eliminated oxygen-containing functional groups to form graphene constitution. Asides from lower stability, AuNPs in sucrose-derived RGO possessed larger size and was more dispersed than those of GO-derived RGO, implying the need to optimise the current recipe. Reduction mechanism of both precursors was proposed for better understanding. The aim of this work is to show feasibility of green graphene nanocomposite synthesis that could empower productivity of electronic, optical and optoelectronics applications.

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Synergistic effect of UV and l-ascorbic acid on the reduction of graphene oxide: Reduction kinetics and quantum chemical simulations

Cited by 11 publications

References 23 publications

Near-UV light assisted green reduction of graphene oxide films through l-ascorbic acid

Near-UV light assisted green reduction of graphene oxide films through l-ascorbic acid

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

Comparison study between two different precursors of RGO/AuNPs one pot synthesis

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