Preparation and characterization of partially reduced graphene oxide aerogels doped with transition metal ions

Tadyszak, Krzysztof; Majchrzycki, Łukasz; Szyller, Łukasz; Scheibe, Błażej

doi:10.1007/s10853-018-2770-x

Cited by 26 publications

(23 citation statements)

References 61 publications

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“…Iron is the most basic contamination of carbon and could exist in the sample from the beginning trapped between multilayer GO flakes (or between original graphite), while manganese was added during preparation of graphene oxide by the Hummers' method. Previous studies performed on GO aerogels obtained from the same GO [35,36,42] did not show any metal contaminations even at 4.2 K and at highest magnifications. Further, the contamination source could be the large power ultra-sonication tip, in which GO suspension was ultra-sonicated.…”

Section: Magnetic Properties Of Goqdsmentioning

confidence: 59%

“…The final filtration step narrowed the distribution the most and subsequently produced the GOQDs used in all further measurements. Energy dispersive X-ray spectroscopy (EDX) revealed a similar elemental composition to GO provided by the same company [42]. The most dominant elements in GOQDs were 58% C; 40% O; 1% Na, and 1% S, the same within resolution limits of the technique to original GO flakes.…”

Section: Goqds Fabricationmentioning

confidence: 83%

“…Traces of remaining sodium and sulphur after the Hummers' method were observed, however, no traces of manganese or iron were seen. Is it worth noting that previous EPR measurements on GO aerogels at 4.2 K revealed manganese-free samples [42].…”

Section: Goqds Fabricationmentioning

confidence: 85%

“…In the case of carbon nanodots, the source of PL is dominated by trap states in the bandgap and by the superposition of responses of assembled individual emitters (functionalization) and does not Energy dispersive X-ray spectroscopy (EDX) revealed a similar elemental composition to GO provided by the same company [42]. The most dominant elements in GOQDs were 58% C; 40% O; 1% Na, and 1% S, the same within resolution limits of the technique to original GO flakes.…”

Section: Optical Measurements Confirm Goqdsmentioning

confidence: 99%

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Unraveling Origins of EPR Spectrum in Graphene Oxide Quantum Dots

et al. 2020

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Carbon nanostructures are utilized in a plethora of applications ranging from biomedicine to electronics. Particularly interesting are carbon nanostructured quantum dots that can be simultaneously used for bimodal therapies with both targeting and imaging capabilities. Here, magnetic and optical properties of graphene oxide quantum dots (GOQDs) prepared by the top-down technique from graphene oxide and obtained using the Hummers’ method were studied. Graphene oxide was ultra-sonicated, boiled in HNO3, ultra-centrifuged, and finally filtrated, reaching a mean flake size of ~30 nm with quantum dot properties. Flake size distributions were obtained from scanning electron microscopy (SEM) images after consecutive preparation steps. Energy-dispersive X-ray (EDX) confirmed that GOQDs were still oxidized after the fabrication procedure. Magnetic and photoluminescence measurements performed on the obtained GOQDs revealed their paramagnetic behavior and broad range optical photoluminescence around 500 nm, with magnetic moments of 2.41 µB. Finally, electron paramagnetic resonance (EPR) was used to separate the unforeseen contributions and typically not taken into account metal contaminations, and radicals from carbon defects. This study contributes to a better understanding of magnetic properties of carbon nanostructures, which could in the future be used for the design of multimodal imaging agents.

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Section: Magnetic Properties Of Goqdsmentioning

confidence: 59%

Section: Goqds Fabricationmentioning

confidence: 83%

Section: Goqds Fabricationmentioning

confidence: 85%

Section: Optical Measurements Confirm Goqdsmentioning

confidence: 99%

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Unraveling Origins of EPR Spectrum in Graphene Oxide Quantum Dots

et al. 2020

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“…In addition, incorporation of heteroatoms such as oxygen (O) [117] , phosphorus (P) [118][119][120] , sulfur (S) [121][122][123] , fluorine (F) [124,125] , chlorine (Cl) [126][127][128] , bromine (Br) [127,129] , iodine (I) [125,130] and selenium (Se) [131] has also been reported in literature. Furthermore, hybrid materials with enhanced electrochemical properties can be produced by introducing transition metals like cobalt (Co) [132][133][134] , iron (Fe) [134][135][136] , nickel (Ni) [135] and chromium (Cr) [136] to the graphene matrix.…”

Section: Heteroatom Doped-graphenementioning

confidence: 99%

Recent advances in graphene based materials as anode materials in sodium-ion batteries

Wasalathilake

et al. 2020

Journal of Energy Chemistry

108

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DNA‐rGO Aerogel Bioanodes with Microcompartmentalization for High‐Performance Bioelectrochemical Systems

Leng,

Chen,

McCuskey

et al. 2024

Adv Elect Materials

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Bioelectrochemical systems (BES) have garnered significant attention for their applications in renewable energy, microbial fuel cells, biocatalysis, and bioelectronics. In BES, bioelectrodes are used to facilitate extracellular electron transfer among microbial biocatalysts. This study is focused on enhancing the efficiency of these processes through microcompartmentalization, a technique that strategically organizes and segregates microorganisms within the electrode, thereby bolstering BES output efficiency. The study introduces a deoxyribonucleic acid (DNA)‐based reduced graphene oxide (rGO) aerogel engineered as a bioanode to facilitate microorganism compartmentalization while providing an expanded biocompatible surface with continuous conductivity. The DNA‐rGO aerogel is synthesized through the self‐assembly of graphene oxide and DNA, with thermal reduction imparting lightweight structural stability and conductivity to the material. The DNA component serves as a hydrophilic framework, enabling precise regulation of compartment size and biofunctionalization of the rGO surface. To evaluate the performance of this aerogel bioanode, measurements of current generation are conducted using Shewanella oneidensis MR‐1 bacteria as a model biocatalyst. The bioanode exhibits a current density reaching up to 1.5 A·m⁻2, surpassing the capabilities of many existing bioanodes. With its abundant microcompartments, the DNA‐rGO demonstrates high current generation performance, representing a sustainable approach for energy harvesting without reliance on metals, polymers, or heterostructures.

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Preparation and characterization of partially reduced graphene oxide aerogels doped with transition metal ions

Cited by 26 publications

References 61 publications

Unraveling Origins of EPR Spectrum in Graphene Oxide Quantum Dots

Unraveling Origins of EPR Spectrum in Graphene Oxide Quantum Dots

Recent advances in graphene based materials as anode materials in sodium-ion batteries

DNA‐rGO Aerogel Bioanodes with Microcompartmentalization for High‐Performance Bioelectrochemical Systems

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