Preparation of graphene quantum dots with high quantum yield by a facile one-step method and applications for cell imaging

Su, Jie; Zhang, Xin; Tong, Xiaolei; Wang, Xueyuan; Yang, Panxing; Yao, Fanglian; Guo, Ran; Yuan, Caideng

doi:10.1016/j.matlet.2020.127806

Cited by 28 publications

(20 citation statements)

References 13 publications

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“…The method can be considered green, despite the fact that the pre-synthesized GO was obtained by treating synthetic graphite flakes with H 2 O 2 , concentrated sulfuric acid, concentrated hydrochloric acid, phosphorus pentoxide, potassium persulfate, potassium permanganate, and quinine sulphate. Using the same precursor but a different approach, Su et al [ 38 ] synthesized nitrogen doped GQDs (N-GQDs) as promising probes for bio-imaging, from graphene oxide (GO), ethylenediamine and hydrogen peroxide. First, GO was synthesized from expandable graphite by the modified Hummers method [ 39 ] ( Figure 2 a) and then treated in an autoclave at 200 °C for 3 h. An interesting electrochemical exfoliation approach for the large-scale production of GQDs was proposed by He et al [ 40 ], using coke obtained by pyrolysis at 1000 °C as starting material.…”

Section: Gqds From Eco-friendly Raw Materials By Green Approachesmentioning

confidence: 99%

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

et al. 2021

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The continuous decrease in the availability of fossil resources, along with an evident energy crisis, and the growing environmental impact due to their use, has pushed scientific research towards the development of innovative strategies and green routes for the use of renewable resources, not only in the field of energy production but also for the production of novel advanced materials and platform molecules for the modern chemical industry. A new class of promising carbon nanomaterials, especially graphene quantum dots (GQDs), due to their exceptional chemical-physical features, have been studied in many applications, such as biosensors, solar cells, electrochemical devices, optical sensors, and rechargeable batteries. Therefore, this review focuses on recent results in GQDs synthesis by green, easy, and low-cost synthetic processes from eco-friendly raw materials and biomass-waste. Significant advances in recent years on promising recent applications in the field of electrochemical sensors, have also been discussed. Finally, challenges and future perspectives with possible research directions in the topic are briefly summarized.

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Section: Gqds From Eco-friendly Raw Materials By Green Approachesmentioning

confidence: 99%

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

et al. 2021

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“…Su et al synthesized N-GQDs using a GO as a precursor and EDA as a nitrogen source, with a product yield of 20% [ 115 ]. GO, EDA, and H 2 O 2 were dissolved in ultra-pure water and heated in an autoclave at 200 °C for 3 h. The average lateral size of N-GQDs was 1.84 ± 0.28 nm.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…[ 154 ]. Using HR-TEM, it is possible to measure d-spacing (distance between planes of atoms), which can help to confirm the graphite structure in the investigated sample [ 112 , 115 , 117 , 131 , 143 , 152 ]. Figure 5 d shows an HR-TEM image of GQDs obtained by combining the oxidation of GO in the presence of HNO 3 and hydrothermal conditions (200 °C, 8 h) [ 154 ].…”

Section: Characterizationsmentioning

confidence: 99%

“…GQDs show strong absorption in the UV region of the spectrum and photoluminescence in the visible part of the spectrum [ 106 , 161 ]. In GQDs’ UV–visible absorption spectra, the peaks at 360 nm correspond to the n-π* transition of the C=O bond, and features at 280 or 230 nm are attributed to the π-π* transition of aromatic sp 2 -carbon atoms [ 112 , 114 , 115 , 121 ]. In some cases, these peaks can be shifted to 301 and 228 or 290 nm for the n-π* transition of C=O and the π-π* transition of the sp 2 -aromatic fragment, respectively.…”

Section: Characterizationsmentioning

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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“…GQDs are tiny carbon-sourced materials and can be synthesized by bottom-up or/and top-down methods via diverse chemical synthetic approaches [ 47 ]. The top-down approach is mainly based on the physical cutting of GSs, where the bottom-up approach is based on the chemical synthesis of GQDs in pieces from small molecular fragments while enabling the management of their morphological properties [ 48 , 49 , 50 ]. Nanolithography, electrochemical scissoring of GSs, chemical exfoliation, and hydrothermal as well as solvothermal cutting of GSs are the methods for cutting approaches to obtain GQDs [ 16 ].…”

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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Preparation of graphene quantum dots with high quantum yield by a facile one-step method and applications for cell imaging

Cited by 28 publications

References 13 publications

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

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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