Difference between ammonia and urea on nitrogen doping of graphene quantum dots

Zhu, Yanyun; Yan, Luting; Xu, Mingyuan; Li, Yuting; Song, Xiuzu; Yin, Lan

doi:10.1016/j.colsurfa.2020.125703

Cited by 26 publications

(16 citation statements)

References 59 publications

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“…By adjusting the ratio of raw materials, represented in Figure 1a, CoPc/GQDs were prepared by the reported hydrothermal method. [ 63 ] Briefly, 3.152 g citric acid monohydrate and 0.900 g urea were successively added into 60 mL of ethanol solution and stirred for 15 min. Then, 100 mg of purple‐colored CoPc was added to the mixture solution and continued stirring for another hour.…”

Section: Methodsmentioning

confidence: 99%

GQDs Incorporated CoPc Nanorods for Electrochemical Detection of Dopamine and Uric Acid

Ramachandran

et al. 2022

Adv Materials Inter

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Dopamine (DA) and uric acid (UA) are biomolecules of great consideration that coexist in human body. It is essential and challenging to detect them simultaneously with high sensitivity. This paper reports a novel electrochemical biosensor based on the nanocomposites of cobalt phthalocyanine (CoPc) anchored with graphene quantum dots (GQDs) for DA and UA detection. The GQDs incorporation on CoPc nanorods with partial end stretching significantly enhances the electrocatalytic activity and promotes the electron transfer rate. Low detection limits of 21 nm for DA and 145 nm for UA have been successfully achieved for the fabricated CoPc/GQDs biosensor. The density‐functional theory proves the enhanced conductivity of CoPc/GQDs and the biomolecule's interaction with the electrode surface. Furthermore, the proposed sensor shows remarkable reproducibility, repeatability, and stability. The fabricated sensor is applied for the simultaneous detections of DA and UA in human urine samples. The excellent performance suggests that the CoPc/GQDs could be a promising and potential candidate for electrochemical sensors to detect DA and UA selectively.

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Section: Methodsmentioning

confidence: 99%

GQDs Incorporated CoPc Nanorods for Electrochemical Detection of Dopamine and Uric Acid

Ramachandran

et al. 2022

Adv Materials Inter

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“…The effect of U and NH 3 on the structure of GQDs produced by CA decomposition was studied too [ 70 ]. CA and NH 3 were heated in autoclaves for 10 h at 200 °C (A-GQDs), while CA and U were exposed to 180 °C for 4 h (U-GQDs).…”

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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“…After polymerisation and carbonisation, nitrogen atoms enter the carbon materials. Commonly used nitrogen-containing precursors include polyimides [ 20 ], ethylenediamine [ 21 ], ionic liquids [ 22 ], melamine [ 23 ], polypyrrole [ 24 ], acetonitrile [ 25 ], urea [ 26 ] and nitrogen-containing metal-organic framework compounds (MOFs) [ 27 ]. The post-treatment is used to modify the pre-synthesised carbon materials by nitrogen-rich substances as nitrogen sources.…”

Section: Introductionmentioning

confidence: 99%

Sensitive Determination of Trace 4-Nitrophenol in Ambient Environment Using a Glassy Carbon Electrode Modified with Formamide-Converted Nitrogen-Doped Carbon Materials

Wang

et al. 2022

IJMS

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Sensing trace amounts of 4-nitrophenol (4-NP) as a harmful substance to organisms even in small quantities is of great importance. The present study includes a sensitive and selective electrochemical sensor for detecting 4-NP in natural water samples using formamide-converted nitrogen-carbon materials (shortened to f-NC) as a new material for electrode modification. The structure and morphology of the f-NC were set apart by SEM, TEM, XRD, XPS, FTIR, Raman, and the electrochemical performance of the f-NC were set apart by CV, EIS and CC. We studied the electrochemical behaviour of 4-NP on the glassy carbon electrode modified with f-NC before and after pyrolysis treatment (denoted as f-NC1/GCE and f-NC2/GCE). In 0.2 M of H2SO4 solution, the f-NC2/GCE has an apparent electrocatalytic activity to reduce 4-NP. Under the optimal conditions, the reduction peak current of 4-NP varies linearly, with its concentration in the range of 0.2 to 100 mM, and the detection limit obtained as 0.02 mM (S/N = 3). In addition, the electrochemical sensor has high selectivity, and the stability is quite good. The preparation and application of the sensor to detect 4-NP in water samples produced satisfactory results, which provides a new method for the simple, sensitive and quantitative detection of 4-NP.

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Difference between ammonia and urea on nitrogen doping of graphene quantum dots

Cited by 26 publications

References 59 publications

GQDs Incorporated CoPc Nanorods for Electrochemical Detection of Dopamine and Uric Acid

GQDs Incorporated CoPc Nanorods for Electrochemical Detection of Dopamine and Uric Acid

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

Sensitive Determination of Trace 4-Nitrophenol in Ambient Environment Using a Glassy Carbon Electrode Modified with Formamide-Converted Nitrogen-Doped Carbon Materials

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