Crumpled few-layer graphene: Connection between morphology and optical properties

Musikhin, Stanislav; Talebi-Moghaddam, S.; Corbin, Joel C.; Smallwood, Gregory J.; Schulz, Christof; Daun, Kyle J.

doi:10.1016/j.carbon.2021.06.052

Cited by 10 publications

(6 citation statements)

References 63 publications

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“…The sheets are in the range of 200–300 nm in size of Feret diameter and are strongly agglomerated after collecting them from the filter. [ 11 ] Differently, using toluene as a reactant leads to the formation of soot‐like particle agglomerates with a count median primary particle diameter of ≈17 nm and a log‐normal particle size distribution ( σ g = 1.3). The corresponding primary particle size distribution is shown in the (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Fortugno,

López-Cámara,

Kruse

et al. 2023

Adv Eng Mater

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This study introduces a novel gas‐phase method for the synthesis of mesoporous silica nanoparticles (MSNs). The method is a two‐step templating approach by first forming silicon‐coated carbon structures in a hybrid microwave‐plasma/hot‐wall reactor followed by an annealing step to produce mesoporous silica with distinct nanostructure and porosity. Two different (sacrificial) carbonaceous templates have been prepared (plasma reactor) and coated (hot‐wall reactor), 2D few‐layer graphene (FLG) flakes and soot‐like fractal aggregates. Results show that the wall thickness of the porous silica structures can be adjusted by changing the concentration of the silicon precursor (monosilane). High monosilane concentrations, however, result in solid silica particles after annealing. Using soot‐like particle templates permitted to control of the shell thickness of the hollow porous particles, while the FLG template results in ultrathin silica sheets after heat treatment. The pore volume and specific surface area increase up to 263 m2 g−1 and 0.6 cm3 g−1, respectively, by the formation of hollow porous particles. An adsorption study on carbamazepine reveals up to ≈86% removal. The gas‐phase aerosol‐based template method presented here offers scalability and versatility, and it is capable of producing MSNs with a controlled structure and porosity by modifying the carbonaceous templates.

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Section: Resultsmentioning

confidence: 99%

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Fortugno,

López-Cámara,

Kruse

et al. 2023

Adv Eng Mater

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“…The number of rGO layers was counted via HRTEM imaging. 42 Figure S5a,b shows regions with 3−5 layers characterized as the few-layered graphene (FLG) 43 structure and 10−15 layers, respectively. HRTEM high-angle annular dark-field (HAADF) elemental mapping was performed to note whether localized regions of higher or lower oxidation ratios are present on the same sample and to confirm whether or not problematic ad-layers or substrate impurities are present in the sample.…”

Section: Resultsmentioning

confidence: 99%

Direct Thermochemical CO₂ Reduction to Reduced Graphene Oxide-like Nanomaterials: Implications for Environmental and Energy Storage and Conversion Applications

Badreldin

Elsaid

Yiming

et al. 2022

ACS Appl. Nano Mater.

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CO2 capture and conversion to value-added products have seen continued advancement in recent years through electrochemical and thermochemical routes. In this work, we have adapted a facile and potentially scalable thermochemical reduction technique that directly reduces CO2 to different-quality reduced graphene oxide (rGO) solids. Several characterization techniques have been undertaken to investigate the role of two- and three-dimensional copper catalytic substrates, reaction time, and CO2 humidity content on the characteristics of the prepared rGO. Growth for 1 h at 550 °C atop a uniform two-dimensional (2D) catalytic copper substrate under a humidified CO2 environment (0.14 gH2O/gCO2) attained rGO with low defect densities (0.36 × 1011 cm–2) and high domain (31.9 nm) and crystallite (3.32 nm) sizes. Detailed statistical Raman analyses over large areas confirm that the mean defect distance of the synthesized rGO samples is 16–20 nm, indicative of the intrinsic high quality attained. The degree of reduction in rGO based on C/O ratios from 4 to 8 suggests that operating conditions can be fine-tuned to attain different-quality rGO with different attributable macroproperties such as conductivity and hydrophilicity. The developed method of direct CO2 reduction to rGO can be further tuned to produce different quality, morphology, and yield of other high-value solid carbon-based materials for emerging and existing applications.

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“…The increasing variety of synthetic nanoparticles analyzed using TiRe-LII is reflected both in nanoparticle materials as well as particle morphologies, which can include aggregates of spheres, prisms [48], core-shell structures (e.g., [49][50][51]) and more complex shapes, like few-layer graphene (FLG) flakes [41,52]. As long as these particles absorb and emit in the Rayleigh regime, the absorption cross-section can usually be approximated as proportional to the volume/number of dipoles contained in the nanoparticle.…”

Section: Spectroscopic Submodelmentioning

confidence: 99%

“…absorption cross-section of soot aggregates is well-approximated by the sum of absorption cross-sections of individual primary particles through Rayleigh-Debye-Gans fractal aggregate theory [53], and preliminary research also suggests that the spectroscopic properties of FLG particles can be modeled using the electrostatic approximation [52].…”

Section: Spectroscopic Submodelmentioning

confidence: 99%

“…Results are for excitation at 1064 nm, unless otherwise stated. The 1064 nm curve for the CNTs (yellow, dotted line) is a predicted curve, assuming the Rayleigh approximation (which has been shown to be valid for a range of carbon allotropes, e.g., [52]) and a constant E(m) (which is roughly true, ± 15% [189,190]). Dashed lines correspond to soot.…”

Section: Fig 16mentioning

confidence: 99%

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Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

et al. 2022

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Laser-induced incandescence (LII) is a widely used combustion diagnostic for in situ measurements of soot primary particle sizes and volume fractions in flames, exhaust gases, and the atmosphere. Increasingly, however, it is applied to characterize engineered nanomaterials, driven by the increasing industrial relevance of these materials and the fundamental scientific insights that may be obtained from these measurements. This review describes the state of the art as well as open research challenges and new opportunities that arise from LII measurements on non-soot nanoparticles. An overview of the basic LII model, along with statistical techniques for inferring quantities-of-interest and associated uncertainties is provided, with a review of the application of LII to various classes of materials, including elemental particles, oxide and nitride materials, and non-soot carbonaceous materials, and core–shell particles. The paper concludes with a discussion of combined and complementary diagnostics, and an outlook of future research.

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Crumpled few-layer graphene: Connection between morphology and optical properties

Cited by 10 publications

References 63 publications

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Direct Thermochemical CO₂ Reduction to Reduced Graphene Oxide-like Nanomaterials: Implications for Environmental and Energy Storage and Conversion Applications

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

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Crumpled few-layer graphene: Connection between morphology and optical properties

Cited by 10 publications

References 63 publications

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Direct Thermochemical CO2 Reduction to Reduced Graphene Oxide-like Nanomaterials: Implications for Environmental and Energy Storage and Conversion Applications

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

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Direct Thermochemical CO₂ Reduction to Reduced Graphene Oxide-like Nanomaterials: Implications for Environmental and Energy Storage and Conversion Applications