Direct observation of graphene during Raman analysis and the effect of precursor solution parameter on the graphene structures

Azam, Mohd Asyadi; Aziz, Mohd Sanusi Abdul; Zulkapli, Nor Najihah; Omar, Ghazali; Munawar, Rose Farahiyan; Suan, Mohd Shahadan Mohd; Safie, Nur Ezyanie

doi:10.1016/j.diamond.2020.107767

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…The Raman spectral signal can be used to determine the number of layers, [39] uniaxial strain, [40] the number of carriers and defects or surface configuration in graphene-like materials, [41] and it is a common approach in their characterization (with peaks intensities, halfwidths, areas, Raman shifts considered). [42][43][44][45][46][47][48][49][50][51][52] The main drawbacks of the quantitative description of carbon powders are related to the profound internal changes in parameters. Thus, proper statistical analysis is needed, and mapping should be used instead of point measurements.…”

Section: Raman Spectroscopy Of Nanocarbonsmentioning

confidence: 99%

Battery Powder as a Source of Novel Graphene Nanocarbons

Dąbrowska

Urbańska

Warczak

et al. 2022

Physica Status Solidi (b)

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Lithium‐ion batteries (LIBs) waste is classified as a dangerous one. Hopefully, LIBs can be recycled, and they are already a valuable source of metals. This work is focused on the properties of the spent LIBs powder, which is a postproduct of the proposed organic leaching process and is presented as a source of nanocarbons with a unique structure. Furthermore, attention is paid to revealing the properties of the carbon component that can find a second life in other applications like photocatalysis or sorbents. Raman spectroscopy is used for the characterization of graphitic carbon. Scanning electron microscopy images are numerically quantitatively analyzed to provide additional parameters (for instance, the total length of edges) about the structure of materials, and X‐ray diffraction (XRD) and energy‐dispersive X‐ray spectroscopy (EDS) further check their composition.

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Section: Raman Spectroscopy Of Nanocarbonsmentioning

confidence: 99%

Battery Powder as a Source of Novel Graphene Nanocarbons

Dąbrowska

Urbańska

Warczak

et al. 2022

Physica Status Solidi (b)

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“…Figure 1(a) illustrates the Raman spectrum for the graphene electrodes using PTFE as the binder. In theory, the defect level in sp 2 -bonded carbon atom domains can be determined using the Raman relative peak intensity or area ratio of the D to G band (ID/IG) [19]. Raman spectrum showed the D and G bands at 1344 cm −1 and 1599 cm −1 , respectively, with an ID/IG ratio of 0.84.…”

Section: Structural and Morphological Properties Of Graphene Electrodementioning

confidence: 99%

Effect of Polytetrafluoroethylene Binder Content on Gravimetric Capacitance and Life Cycle Stability of Graphene Supercapacitor

Azam

Seman

Mohamed

et al. 2022

Int. J. Automot. Mech. Eng.

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One of the major elements in determining the supercapacitor performance is the development of a nano-layered structure through facilitating the surface-dependent electrochemical reaction processes. Carbon-based nanomaterials especially graphene, has attracted tremendous interest in electrical charge and power sources including supercapacitor because of their exceptional properties, which include high conductivity and large specific surface area. In this paper, the effect of polytetrafluoroethylene (PTFE) binder ratio (1, 5, 10, and 15 wt. %) on the electrochemical performance of graphene supercapacitor are evaluated. In addition, the facile and scalable preparation of graphene electrodes by using low-cost slurry technique is proposed. From the conducted experimental works, it was found that the fabricated graphene electrodes exhibit superior electrochemical properties for supercapacitor applications with a specific gravimetric capacitance of up to 373 F g−1. Moreover, the graphene electrode presented excellent cyclic stability with 99 % specific capacitance retention after 10,000 charge/discharge cycles hence promising for long‐lasting supercapacitors. The outcomes from the deliberated study serve as the basis of knowledge in the development of a cost-effective graphene-based materials production for energy storage devices.

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“…Chemical vapor deposition (CVD) so far is the best technique for synthesizing high-quality graphene thin film. [52][53][54][55] However, since the method requires expensive equipment, researchers are looking for another alternative way of producing graphene-like material. From works of literature, the most commonly studied graphene-related materials are GO and rGO.…”

Section: Graphene-based Materialsmentioning

confidence: 99%

“…The layer resembles a honeycomb‐like structure made up of sp 2 hybridization of carbon atoms. Chemical vapor deposition (CVD) so far is the best technique for synthesizing high‐quality graphene thin film 52‐55 . However, since the method requires expensive equipment, researchers are looking for another alternative way of producing graphene‐like material.…”

Section: Introductionmentioning

confidence: 99%

Recent progress of graphene‐based materials for efficient charge transfer and device performance stability in perovskite solar cells

et al. 2020

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Summary The relevance of graphene‐based materials throughout the niche area of perovskite solar cells (PSCs) is indeed the main focus of this review. Specific properties of two types of solar cell materials, namely hybrid perovskites and graphene‐based materials are at the core of significant breakthroughs in a wide range of applications. The specific features of graphene‐based materials, along with their unique properties, have been utilized mainly in the development of photovoltaic devices. PSCs are known to have promising device performance and surpass other third‐generation solar cells, including organic photovoltaics, quantum dot solar cells, and dye‐sensitized solar cells. However, PSCs address several limitations in the device mechanism and material stability. PSCs performance tends to deplete over time due to several factors such as the degradation of materials used in the device caused by exposure of thermal and moisture, as well as an undesired chemical reaction in the interfaces. Several experimental studies, especially on the integration of carbon materials, including the graphene, have been extensively explored. The integration of graphene‐based materials is one of the potential methods for altering and modifying components in PSCs, including perovskite structure and charges transport layers. Therefore, this review gives an overview of recent progress in the development of PSCs with the integration of graphene‐based materials. The emphasis will be on the influence brought by graphene‐based materials on the charge transport mechanism at the interfaces and perovskite morphology toward the improvement of photovoltaic performance and stability.

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Direct observation of graphene during Raman analysis and the effect of precursor solution parameter on the graphene structures

Cited by 9 publications

References 24 publications

Battery Powder as a Source of Novel Graphene Nanocarbons

Battery Powder as a Source of Novel Graphene Nanocarbons

Effect of Polytetrafluoroethylene Binder Content on Gravimetric Capacitance and Life Cycle Stability of Graphene Supercapacitor

Recent progress of graphene‐based materials for efficient charge transfer and device performance stability in perovskite solar cells

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