Highly selective antenna effect of graphene quantum dots (GQDs): A new fluorescent sensitizer for rare earth element terbium in aqueous media

Wang, Shengnan; Xu, Can; Xiang, Xin; Cao, Yan

doi:10.1016/j.talanta.2019.120504

Cited by 25 publications

(16 citation statements)

References 41 publications

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“…The chemical oxidation and exfoliation of graphite materials leads to GQD production as well [ 110 , 111 , 112 ]. Shengnan et al used multilayer GO as a starting material [ 112 ].…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…The chemical oxidation and exfoliation of graphite materials leads to GQD production as well [ 110 , 111 , 112 ]. Shengnan et al used multilayer GO as a starting material [ 112 ]. A commercial GO was suspended in a mixture that contained sulfuric and nitric acid and heated under reflux for 24 h at a temperature of 110 °C.…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

“…To investigate the size and the shape of GQDs, TEM has been used in many studies. TEM offers information about morphology, and it is often used to calculate the size distribution of GQDs ( Figure 5 a,c) [ 109 , 112 , 114 , 152 , 153 ]. High-resolution (HR-TEM) allows the investigation of the microstructure of GQDs, such as crystallization, lattice fringes, etc.…”

Section: Characterizationsmentioning

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%

“…The G band stems from the sp 2− carbon network while the D band is a result of defects in the graphite structure. The values of intensity ratio between the D and G bands (I D /I G ) indicate defects in graphene structures [ 112 , 114 , 117 , 152 , 157 ]. For example, in the Raman spectra of four GQDs separated using dialysis tubes filtering different molecular weights (1, 3.5, 7, and 14 kDa), I D /I G ratios for the different samples were 0.98, 0.93, 0.94, and 1, respectively ( Figure 5 f) [ 158 ].…”

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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“…The chemical oxidation and exfoliation of graphite materials leads to GQD production as well [ 110 , 111 , 112 ]. Shengnan et al used multilayer GO as a starting material [ 112 ].…”

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

Section: Graphene Quantum Dots Synthetic Strategiesmentioning

confidence: 99%

Section: Characterizationsmentioning

confidence: 99%

Section: Characterizationsmentioning

confidence: 99%

Section: Characterizationsmentioning

confidence: 99%

See 3 more Smart Citations

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

2021

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Time‐resolved fluorescence sensor array for the discrimination of phosphate anions using transition metal dichalcogenide quantum dots and Tb(III)

Behera

Jaiswal

2022

Luminescence

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Phosphate detection has garnered widespread attention due to its biological and environmental impact. Among several optical techniques, time‐resolved fluorescence (TRF) provides a sensitive way for the discrimination of analytes in a complex mixture as it exhibits less interference from the background, therefore providing a high signal‐to‐noise ratio. The sensitization of rare earth metal (REM) ions by semiconducting quantum dots (QDs) can help the former overcome the drawback of low absorption coefficient, therefore allowing exploitation of the additional advantage of the REM, namely the long‐excited state lifetime. Here, we have developed a TRF‐based sensor array consisting of three QDs, i.e. MoS2, WS2 and MoSe2 as energy sensitizers for Tb3+ ions. Different QDs possess variable energy transfer abilities for Tb3+ ions. Therefore, they can be used to discriminate phosphates. It was also observed that CrO42− can competitively bind to Tb3+ and further enhance the efficiency of the sensor array so that it could discriminate six different phosphates at 200 μM concentration in aqueous as well as serum medium with a detection limit of 10 μM in aqueous medium. Therefore, the sensitivity of the TRF‐based sensor array is rarely compromised in a complex mixture, which is advantageous over a fluorescence‐based sensor array.

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Selective and Sensitive ZnO Quantum Dots Based Fluorescent Biosensor for Detection of Cysteine

Kamacı

2021

J Fluoresc

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Highly selective antenna effect of graphene quantum dots (GQDs): A new fluorescent sensitizer for rare earth element terbium in aqueous media

Cited by 25 publications

References 41 publications

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

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

Time‐resolved fluorescence sensor array for the discrimination of phosphate anions using transition metal dichalcogenide quantum dots and Tb(III)

Selective and Sensitive ZnO Quantum Dots Based Fluorescent Biosensor for Detection of Cysteine

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