Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

Маслова, О. А.; Ammar, Mohamed‐Ramzi; Guimbretière, Guillaume; Rouzaud, Jean-Noël; Simon, Patrick

doi:10.1103/physrevb.86.134205

Cited by 149 publications

(113 citation statements)

References 38 publications

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“…Besides this, the full width at half-maximum (FWHM) of the G band (Γ G ) increased from 92.8 cm −1 to 111.7 cm −1 when the ratio of biochar to KOH decreased from 1:1 to 1:3. As reviewed by Maslova et al [44], higher Γ G represents a larger amount of defects for carbonaceous materials.…”

Section: Resultsmentioning

confidence: 99%

“…Besides this, the full width at halfmaximum (FWHM) of the G band (ΓG) increased from 92.8 cm −1 to 111.7 cm −1 when the ratio of biochar to KOH decreased from 1:1 to 1:3. As reviewed by Maslova et al [44], higher ΓG represents a larger amount of defects for carbonaceous materials. It has been reported that the crystallite domain size (La) of carbonaceous materials can be calculated using the equation La = C(λL)/(ID/IG) where a linear relationship C(λL) ≈ C0 + λLC1 is valid in the excitation wavelength range of 400 nm < λL < 700 nm where C0 = −12.6 nm and C1 = 0.033 [45].…”

Section: Resultsmentioning

confidence: 99%

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High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

Hossain

et al. 2018

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Synthesis of activated carbon from waste biomass is of current interest towards sustainability. The properties of biomass-derived activated carbon largely depend on the carbonization process. This study reports the preparation of mesoporous activated carbon with extremely high surface area from hemp bast fiber using hydrothermal processing. Hot water processing (390-500 • C) followed by activation using KOH and NaOH was investigated at different mass ratios. The described approach was found to enhance the mesoporosity (centered at 3.0 to 4.5 nm) of the hemp-derived activated carbon (HAC) from activation [confirmed by BJH (Barrett-Joyner-Halenda) pore size distribution and TEM (transmission electron microscopy) imaging]. BET (Brunauer-Emmett-Teller) results showed that the product has an extremely high surface area (2425 m 2 /g) while the surface functional groups (-OH, -COOH, C=C/C-C) were confirmed by FTIR (Fourier transform infrared spectroscopy) and further quantified by XPS (X-ray photoelectron spectroscopy). Increasing KOH concentration was found to enhance the surface area with a maximum biochar-to-KOH (g/g) ratio of 1:3. The crystallite domain size of HAC was determined using Raman spectroscopy of different wavelengths. The procedure described in this study is an environmentally friendly scalable route for the mass production of activated carbon using hemp fiber.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

Hossain

et al. 2018

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“…as a source of lm-scale structural heterogeneities. Lastly, as the Raman spectra were obtained by focusing the laser beam through the mineral onto organic matter in the subsurface, thinsection polishing artifacts (Beyssac et al, 2003;Ammar and Rouzaud, 2012;Maslova et al, 2012) cannot be the reason for the lm-scale structural heterogeneities.…”

Section: Raman Spectroscopy and Ultrastructural Heterogeneities In Ormentioning

confidence: 99%

Carbonaceous biosignatures of diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation

Wang

Xiao

Whitehouse

et al. 2017

Precambrian Research

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a b s t r a c tThe Ediacaran Doushantuo Formation (DST) is renowned for exceptionally preserved Precambrian fossils including metazoans. Some of these fossils, particularly microfossils such as multicellular algae and acanthomorphic acritarchs, are preserved in DST chert nodules. To better understand the geomicrobiological processes that contributed to the authigenic formation of DST chert nodules and facilitated exceptional fossil preservation, we analyzed organic matter in these chert nodules and the surrounding matrix (calcareous mudstone) using multiple in-situ techniques: confocal laser Raman spectroscopy, micro-Fourier transform infrared spectroscopy (FTIR), and secondary ion mass spectroscopy (SIMS). We found strong ultrastructural, chemical, and isotopic heterogeneities in the organic matter as indicated by the Raman spectral parameter I-1350/1600 ranging from 0.49 to 0.88, the infrared spectral index R 3/2 from 0.12 to 0.90, and an estimated d13C org-SIMS range of 44‰ (V-PDB). These micron-scale heterogeneities imply that the organic matter preserved in the DST chert nodules is derived from different carbonaceous sources in a diverse microbial ecosystem, including eukaryotic and/or prokaryotic photoautotrophs, as well as chemotrophs involved in the fermentation and probably anaerobic oxidation of organic remains. Thus, the microbial ecosystems in Ediacaran ocean waters and sediments were more complex than previously thought, and these microbial processes controlled dynamic micro-environments in DST sediments where chert nodules were formed and fossils were mineralized. The results also show that variations in the relative abundances, activities, and interactions of co-existing microorganisms in DST sediments may have modulated d13C org shifts, causing local decoupling between d13C org and d13C carb as measured in bulk samples.

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“…Maslova et al [ 30 ] demonstrated that FWHM(G) exhibits a linear correlation with the inverse diameter of crystallite size for the analysis of sp 2 -nanostructured carbon (nanographite), moreover, the I (D)/ I (G) ratio was found to be dependent on the preparation procedure of the nanographites.…”

Section: Introductionmentioning

confidence: 99%

“…The second Raman-forbidden band, named D', appears as a shoulder at the high-frequency side of the G peak due to the presence of disorder (Figure 2 a). Moreover, this band is dispersive in the frequency because of the double resonant scattering; [ 28,30 ] however, the relative intensity of this band is usually low.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

152

110

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the manipulation of graphene and its derivatives occupy a relatively insignifi cant part, i.e., less than 1%. The fi rst publications on graphene modifi cation with laser irradiation appeared in 2008, however, since 2010, the number of publications has risen exponentially.Graphene oxide (GO) has emerged as a versatile material for nanocarbon research. Several types of oxygen-containing functional groups present on the basal plane, and the sheet edge allows GO to interact with a broad range of organic and inorganic materials. [ 9 ] Furthermore, GO is an abundant and low-cost material synthesized from graphite or graphite oxide; it retains a layered structure but, at the same time, it can be characterized by the loss of electronic conjugation caused by the oxy groups at the edge or plane defects. GO has a potential use in energy, [ 10 ] electronics, [ 11 ] molecular sensing areas, [ 12 ] catalysis, [ 13 ] etc. Moreover, it can be reduced chemically or thermally in order to achieve graphenelike properties. [ 14 ] The material produced during such a procedure is usually referred to as "reduced GO" (rGO). However, residual defects such as remnant oxygen atoms, [ 15 ] Stone-Wales defects (pentagon-heptagon pairs), [ 16 ] and holes [ 17 ] appearing due to the loss of carbon (in the form of CO or CO 2 ) from the basal plane [ 18 ] limit the electronic quality of rGO.A laser is a powerful tool which is used for various applications in industry, medicine, science, and material processing. [ 19 ] It is usually employed in different processes such as ablation, etching, cutting of various materials, as well as direct A dramatic rise in research interest in laser-induced graphene oxide (GO) reduction and modifi cation requires an overview of the most recent works on this subject. Typical methods for the recognition and confi rmation of modifi ed graphene and its derivatives, such as Raman, Fourier-transform infra-red (FTIR), X-ray photoelectron (XP), and ultraviolet-visible (UV-vis) spectroscopies, are introduced briefl y in this review. A major part of the survey is devoted to the main modifi cation ways and the laser parameters used in the literature. A discussion of possible reduction and modifi cation mechanisms is also presented. Recent applications, especially in the biomedical fi eld such as cell therapy treatment, as well as signifi cant results of GO modifi cation, are discussed in detail. Finally, perspectives for the application of laser-induced GO modifi cations in passive THz photonics and biomedicine are briefl y addressed.

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Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

Abstract: International audienc

Cited by 149 publications

References 38 publications

High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

Carbonaceous biosignatures of diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

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