Electrochemical synthesis of graphene quantum dots from graphene oxide at room temperature and its soil moisture sensing properties

Kalita, Hemen; Palaparthy, Vinay S.; Baghini, Maryam Shojaei; Aslam, M.

doi:10.1016/j.carbon.2020.04.021

Cited by 97 publications

(33 citation statements)

References 46 publications

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“…The electrolytes and the electrode materials are crucial, because they have the ability to produce CDs with distinct features in terms of their fluorescence emission, cytotoxicity, and surface states [126][127][128][129]. In this context, using graphite as an electrode material, Liu et al proposed the facile synthesis of CDs for bioimaging application as well as for the detection of ferric ion (Fe 3+ ) in water samples [128].…”

Section: Electrochemical/chemical Oxidation Methodsmentioning

confidence: 99%

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

2021

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Carbon dots (CDs) are usually smaller than 10 nm in size, and are meticulously formulated and recently introduced nanomaterials, among the other types of carbon-based nanomaterials. They have gained significant attention and an incredible interest in the field of nanotechnology and biomedical science, which is merely due to their considerable and exclusive attributes; including their enhanced electron transferability, photobleaching and photo-blinking effects, high photoluminescent quantum yield, fluorescence property, resistance to photo-decomposition, increased electrocatalytic activity, good aqueous solubility, excellent biocompatibility, long-term chemical stability, cost-effectiveness, negligible toxicity, and acquaintance of large effective surface area-to-volume ratio. CDs can be readily functionalized owing to the abundant functional groups on their surfaces, and they also exhibit remarkable sensing features such as specific, selective, and multiplex detectability. In addition, the physico-chemical characteristics of CDs can be easily tunable based on their intended usage or application. In this comprehensive review article, we mainly discuss the classification of CDs, their ideal properties, their general synthesis approaches, and primary characterization techniques. More importantly, we update the readers about the recent trends of CDs in health care applications (viz., their substantial and prominent role in the area of electrochemical and optical biosensing, bioimaging, drug/gene delivery, as well as in photodynamic/photothermal therapy).

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Section: Electrochemical/chemical Oxidation Methodsmentioning

confidence: 99%

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

2021

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“…However, in terms of low efficiency, unforeseen structural damage, and heterogeneous morphology, these approaches have major drawbacks [53]. Oxidative degradation, hydrothermal/solvothermal processes, microwave/ ultrasonic processes, electrochemical oxidation, and chemical vapor deposition (CVD), pulsed laser ablation (PLA) are the most important top-down approaches mentioned [54][55][56]. The bottom-up methods, on the other hand, provide a controlled synthesis and provide good carbonation with a reasonable size range, high brightness, and satisfactory properties of the synthesized GQDs [36,51].…”

Section: Synthetic Routes Of Gqdsmentioning

confidence: 99%

Outstanding Graphene Quantum Dots from Carbon Source for Biomedical and Corrosion Inhibition Applications: A Review

et al. 2021

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Graphene quantum dots (GQD) is an efficient nanomaterial composed of one or more layers of graphene with unique properties that combine both graphene and carbon dots (CDs). It can be synthesized using carbon-rich materials as precursors, such as graphite, macromolecules polysaccharides, and fullerene. This contribution emphasizes the utilization of GQD-based materials in the fields of sensing, bioimaging, energy storage, and corrosion inhibitors. Inspired by these numerous applications, various synthetic approaches have been developed to design and fabricate GQD, particularly bottom-up and top-down processes. In this context, the prime goal of this review is to emphasize possible eco-friendly and sustainable methodologies that have been successfully employed in the fabrication of GQDs. Furthermore, the fundamental and experimental aspects associated with GQDs such as possible mechanisms, the impact of size, surface alteration, and doping with other elements, together with their technological and industrial applications have been envisaged. Till now, understanding simple photo luminance (PL) operations in GQDs is very critical as well as there are various methods derived from the optical properties of manufactured GQDs can differ. Lack of determining exact size and morphology is highly required without loss of their optical features. Finally, GQDs are promising candidates in the after-mentioned application fields.

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“…During electrochemical synthesis, carbon starting materials can be placed as electrodes (graphite rods [ 124 ], carbon nanotubes [ 125 ], etc.) or dispersed as electrolytes [ 126 ].…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…The electrochemical synthesis of GQDs in a non-aqueous solution implies the use of organic solvents as a medium for electrolyte dispersion [ 107 ]. Some of the most used organic solvents are propylene carbonate [ 126 ] and acetonitrile [ 132 ]. The high boiling point of propylene carbonate (242 °C) [ 133 ] can affect their removal from isolated products.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

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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Electrochemical synthesis of graphene quantum dots from graphene oxide at room temperature and its soil moisture sensing properties

Cited by 97 publications

References 46 publications

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

Outstanding Graphene Quantum Dots from Carbon Source for Biomedical and Corrosion Inhibition Applications: A Review

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

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