Fundamental study of reduction graphene oxide by sodium borohydride for gas sensor application

Muda, Marco; Ramli, Muhammad M.; Isa, Salmi Mohd; Jamlos, Mohd Faizal; Murad, S. A. Z.; Norhanisah, Z.; Isa, M. Mohamad; Kasjoo, Shahrir R.; Ahmad, Nafees; Nor, N. I. M.; Khalid, N.

doi:10.1063/1.4975267

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…Figure 6 indicates the presence of eight absorption bands in the FTIR spectrum of GO. The absorption peaks located at 3541–3367 cm −1 can be ascribed to O–H group stretching vibration, while the peaks between 2907 and 2232 cm −1 correspond to the asymmetric and symmetric stretching vibrations of C–H [ 28 , 29 ]. The bands observed at 1726 cm −1 , 1615 cm −1 , and 1416 cm −1 are attributed to C=O, C=C, and C–O–C stretching vibrations, respectively [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

et al. 2020

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In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

et al. 2020

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“…Also, the transmittance is higher in the AuNPs/rGO sample. The absence of the 3450 cm −1 peak shows the fact that the GO was reduced, this peak is an indicator of the O-H stretch [26,[28][29][30]. The morphological study of the AuNPs/rGO sample was also done by the SEM, and the results are presented in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide Decorated with Dispersed Gold Nanoparticles: Preparation, Characterization and Electrochemical Evaluation for Oxygen Reduction Reaction

et al. 2020

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The commonly used electrode Pt supported on a carbon (Pt/C) catalyst has demonstrated underperforming electrochemical durability in proton exchange membrane fuel cell (PEMFC) harsh operation conditions, especially in terms of Pt electrochemical instability and carbon corrosion. Gold nanoparticles (AuNPs) are considered one of the best alternative catalysts of PtNPs due to their remarkable selectivity for oxygen reduction reaction (ORR) and electrochemical stability in strong acid conditions, attributes which are ideal for practical PEMFC applications. In this work, we propose a new, facile and low-cost approach to prepare AuNPs supported on reduced graphene oxide nanocompounds (AuNPs/rGO). The morphological and structural properties of the as-prepared AuNPs/rGO were studied using various microscopic and spectroscopic techniques, namely, Raman Spectroscopy, Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), specific surface area (Brunauer–Emmett–Teller, BET). A mesoporous structure with narrow pore size distribution centered at 2 nm approximately, where the pores are regular and interconnected was successfully fabricated. The prepared catalyst was exposed to an accelerated stress test (potential cycles between −0.8 and +0.2 in KOH 1 M solution). The voltammetric stability test indicated a slight degradation after 1500 cycles. The electrochemical stability was assigned to the combined effect of AuNPs formed during chemical synthesis and to graphene oxide support.

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“…A wet chemical route through Hummers' method for the synthesis of functionalized rGO was achieved by Panda et al [8], for which the sensing properties (~71% sensitivity against 30 ppm CO) were used to detect low-concentration CO at room temperature and atmospheric pressure under ambient humidity. Muda et al [143] also reported on the fabrication of a gas sensor based on a vacuum method to achieve a homogenous and uniform thin film of multi-layer rGO on a plastic substrate. The fabricated sensor was used to detect NO 2 , and a sensitivity of ~25% over 50 ppm gas concentration was reported.…”

Section: Surface Functionalization Of Graphene/go/rgo With Metal Oxid...mentioning

confidence: 99%

The Synergistic Properties and Gas Sensing Performance of Functionalized Graphene-Based Sensors

2022

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The detection of toxic gases has long been a priority in industrial manufacturing, environmental monitoring, medical diagnosis, and national defense. The importance of gas sensing is not only of high benefit to such industries but also to the daily lives of people. Graphene-based gas sensors have elicited a lot of interest recently, due to the excellent physical properties of graphene and its derivatives, such as graphene oxide (GO) and reduced graphene oxide (rGO). Graphene oxide and rGO have been shown to offer large surface areas that extend their active sites for adsorbing gas molecules, thereby improving the sensitivity of the sensor. There are several literature reports on the promising functionalization of GO and rGO surfaces with metal oxide, for enhanced performance with regard to selectivity and sensitivity in gas sensing. These synthetic and functionalization methods provide the ideal combination/s required for enhanced gas sensors. In this review, the functionalization of graphene, synthesis of heterostructured nanohybrids, and the assessment of their collaborative performance towards gas-sensing applications are discussed.

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Fundamental study of reduction graphene oxide by sodium borohydride for gas sensor application

Cited by 17 publications

References 16 publications

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

Reduced Graphene Oxide Decorated with Dispersed Gold Nanoparticles: Preparation, Characterization and Electrochemical Evaluation for Oxygen Reduction Reaction

The Synergistic Properties and Gas Sensing Performance of Functionalized Graphene-Based Sensors

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