Preparation of blue- and green-emissive nitrogen-doped graphene quantum dots from graphite and their application in bioimaging

Shah, Hameed; Xie, Wenjing; Wang, Yuanyuan; Jia, Xinrui; Nawaz, Asmat; Qi, Xin; Song, Meirong; Gong, Jian

doi:10.1016/j.msec.2020.111642

Cited by 30 publications

(9 citation statements)

References 33 publications

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“…Graphite presents a sharp peak at 2θ ≈ 26°, while GQDs present a broader and weaker peak in the same region (Figure 3B). However, this peak can be shifted due to the presence of functional groups on the GQDs' structure [48,125]. [113].…”

Section: Figure 2 (A)mentioning

confidence: 99%

Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

et al. 2021

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Graphene quantum dots (GQDs) have been widely investigated in recent years due to their outstanding physicochemical properties. Their remarkable characteristics allied to their capability of being easily synthesized and combined with other materials have allowed their use as electrochemical sensing platforms. In this work, we survey recent applications of GQDs-based nanocomposites in electrochemical sensors and biosensors. Firstly, the main characteristics and synthesis methods of GQDs are addressed. Next, the strategies generally used to obtain the GQDs nanocomposites are discussed. Emphasis is given on the applications of GQDs combined with distinct 0D, 1D, 2D nanomaterials, metal-organic frameworks (MOFs), molecularly imprinted polymers (MIPs), ionic liquids, as well as other types of materials, in varied electrochemical sensors and biosensors for detecting analytes of environmental, medical, and agricultural interest. We also discuss the current trends and challenges towards real applications of GQDs in electrochemical sensors.

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Section: Figure 2 (A)mentioning

confidence: 99%

Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

et al. 2021

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“…Shah et al designed two approaches to obtain fluorescent N-GQDs with distinct optical features, using NMP and DCM [ 122 ]. Graphite flakes and ammonium persulphate (AP) were dispersed in NMP and sonicated for 3 h at 50–60 °C.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…The XRD pattern of pure graphite consists of a single, strong peak centered around 26°, corresponding to the (002) plane. After cutting a graphite material during synthesis, the GQDs’ XRD pattern presents a broad peak that indicates disorder in the graphene structure [ 112 , 117 , 122 , 129 ]. In Figure 5 g, an XRD pattern of GQDs is presented.…”

Section: Characterizationsmentioning

confidence: 99%

“…The first one corresponds to carbon (C 1s) and the latter to oxygen (O 1S). After deconvolution, peaks are assigned to sp 2 /sp 3 bonds (284.76 eV), C-O (286.5 eV), O-C=O (288.5 eV), C-OH and O-C-O (533.0 eV), and C=O (531.7 eV) [ 119 , 122 ]. In N-GQDs, a strong peak at 400 eV is present, which corresponds to the presence of nitrogen (N 1s).…”

Section: Characterizationsmentioning

confidence: 99%

“…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. This results from functionalization with heteroatoms or it is due to the presence of functional groups [ 122 , 157 ]. Changes in peak positions can be attributed to changes in the chemical environment around the chemical bond [ 139 ].…”

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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Carbon Nanotropes: Potential Nanomaterials for Drug Delivery and Biomedical Applications

Roy

Mridha

Baishya

et al. 2023

Carbon Nanostructures in Biomedical Applications

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Preparation of blue- and green-emissive nitrogen-doped graphene quantum dots from graphite and their application in bioimaging

Cited by 30 publications

References 33 publications

Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

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

Carbon Nanotropes: Potential Nanomaterials for Drug Delivery and Biomedical Applications

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