Graphene quantum dots with nitrogen and oxygen derived from simultaneous reaction of solvent as exfoliant and dopant

Kang, Gil-Seong; Lee, Sungho; Yeo, Jun-Seok; Choi, Eun-Su; Lee, Dongkyu; Na, Seok‐In; Joh, Han‐Ik

doi:10.1016/j.cej.2019.04.192

Cited by 15 publications

(16 citation statements)

References 52 publications

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“…The elemental analysis of the CDs is presented in Figure 2a humidity, temperature stress and UV irradiation, as well as a hole transport material [44,45]. In the present work, it is further observed that CDs containing only nitrogen as a heteroatom, but not oxygen, might be superior that typical N-doped quantum dots.…”

Section: Characterization Of Cdssupporting

confidence: 58%

Functionalized carbon dots on TiO2 for perovskite photovoltaics and stable photoanodes for water splitting

Ansón‐Casaos

Hernández‐Ferrer

Vallan

et al. 2021

International Journal of Hydrogen Energy

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Different types of fluorescent carbon nanoparticles, often called carbon dots (CDs), are synthesized by polycondensation and deposited on TiO 2 films to be probed as electron transport layers in organic perovskite photovoltaics and the anode for photoelectrochemical water splitting. Nitrogen CDs, which do not contain oxygen, lead to an increase of around 50 mV in the open circuit voltage of the perovskite cell. All the CD types produce an improved photocurrent in water splitting, particularly CDs that are functionalized with thiol groups and butyl chains. It is demonstrated that the modified electrode is stable under continuous operation for several hours. Other electrochemical characteristics of the electrode, such as the voltammogram shape, onset potentials and open circuit potentials, remain nearly unchanged upon the deposition of CDs. Only the 2 incident photon to current conversion efficiency improves clearly, extending the absorption range by around 20 nm towards longer wavelengths. This study provides new data about mechanisms and electrode arrangements for improving the performance of n-type semiconductors in photovoltaic cells and photoelectrochemical hydrogen production.

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Section: Characterization Of Cdssupporting

confidence: 58%

Functionalized carbon dots on TiO2 for perovskite photovoltaics and stable photoanodes for water splitting

Ansón‐Casaos

Hernández‐Ferrer

Vallan

et al. 2021

International Journal of Hydrogen Energy

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“…One of the most used solvents in solvothermal methods is NMP, which has similar surface energy to graphite and allows the exfoliation of GQDs. Kang et al produced highly crystalline edge N/O-functionalized GQDs with high electrical properties using graphite as a starting material [ 121 ]. Graphite was dispersed in NMP, placed in a Teflon-lined autoclave, and heated at 300 °C for 24 h. After 5 h of heating and 6 h of drying, pure powder N/O-GQDs was obtained.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…After treatment with H 2 O 2 at 170 °C, the reaction crude was transferred to an autoclave and heated at 220 °C for 6 h. Next, one part of the sample was extracted with DCM, and the other with water. Exfoliation of graphite by NMP took place according to the previously described mechanism [ 121 ]. Before exposure to solvothermal conditions, AP induced the expansion and exfoliation of graphite.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

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Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

2021

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During the last 20 years, the scientific community has shown growing interest towards carbonaceous nanomaterials due to their appealing mechanical, thermal, and optical features, depending on the specific nanoforms. Among these, graphene quantum dots (GQDs) recently emerged as one of the most promising nanomaterials due to their outstanding electrical properties, chemical stability, and intense and tunable photoluminescence, as it is witnessed by a booming number of reported applications, ranging from the biological field to the photovoltaic market. To date, a plethora of synthetic protocols have been investigated to modulate the portfolio of features that GQDs possess and to facilitate the use of these materials for target applications. Considering the number of publications and the rapid evolution of this flourishing field of research, this review aims at providing a broad overview of the most widely established synthetic protocols and offering a detailed review of some specific applications that are attracting researchers’ interest.

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“…Moreover, the conjugation was also confirmed and employed by a sensor system that was designed to enantio-recognize of tryptophan isomers [ 83 ]. Additionally, it is possible to synthesize GQDs in combination with heteroatoms like nitrogen (N) [ 31 , 84 , 85 ], sulfur (S) [ 86 , 87 , 88 ], boron (B) [ 89 ], and oxygen (O) [ 90 ] which in turn, these dopings may enhance the capabilities of GQDs in varying manners. For instance, N-doped GQDs synthesized by a hydrothermal reaction could show high antioxidant property as compared to the conventional antioxidant agent utilized in food safety [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene Quantum Dots as Flourishing Nanomaterials for Bio-Imaging, Therapy Development, and Micro-Supercapacitors

et al. 2020

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Graphene quantum dots (GQDs) are considerably a new member of the carbon family and shine amongst other members, thanks to their superior electrochemical, optical, and structural properties as well as biocompatibility features that enable us to engage them in various bioengineering purposes. Especially, the quantum confinement and edge effects are giving GQDs their tremendous character, while their heteroatom doping attributes enable us to specifically and meritoriously tune their prospective characteristics for innumerable operations. Considering the substantial role offered by GQDs in the area of biomedicine and nanoscience, through this review paper, we primarily focus on their applications in bio-imaging, micro-supercapacitors, as well as in therapy development. The size-dependent aspects, functionalization, and particular utilization of the GQDs are discussed in detail with respect to their distinct nano-bio-technological applications.

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Graphene quantum dots with nitrogen and oxygen derived from simultaneous reaction of solvent as exfoliant and dopant

Cited by 15 publications

References 52 publications

Functionalized carbon dots on TiO2 for perovskite photovoltaics and stable photoanodes for water splitting

Functionalized carbon dots on TiO2 for perovskite photovoltaics and stable photoanodes for water splitting

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

Graphene Quantum Dots as Flourishing Nanomaterials for Bio-Imaging, Therapy Development, and Micro-Supercapacitors

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