S,N co-doped graphene quantum dots-induced ascorbic acid fluorescent sensor: Design, characterization and performance

Safardoust-Hojaghan, Hossein; Amiri, Omid; Hassanpour, Mohammad; Panahi-Kalamuei, Mokhtar; Moayedi, Hossein; Salavati‐Niasari, Masoud

doi:10.1016/j.foodchem.2019.05.169

Cited by 72 publications

(26 citation statements)

References 38 publications

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“…The XRD pattern confirmed the existence of large peaks at 2θ = 26.18°, which was related to the amorphous nature and disordered carbons of N-GQDs. 47 …”

Section: Resultsmentioning

confidence: 99%

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

et al. 2021

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This study aimed to synthesize dimethylglyoxime (DMG) (N-source)-doped graphene quantum dots (N-GQDs) via simultaneous pyrolysis of citric acid and 1.0% (w/v) DMG. The maximum excitation wavelength (λ max , ex = 380 nm) of the N-GQD solution (49% quantum yield (QY)) was a red shift with respect to that of bare GQDs (λ max , ex = 365 nm) (46% QY); at the same maximum emission wavelength (λ max , em = 460 nm), their resonance light scattering (RLS) intensity peak was observed at λ max , ex/em = 530/533 nm. FTIR, X-ray photoelectron spectroscopy, XRD, energy-dispersive X-ray spectroscopy, and transmission electron microscopy analyses were performed to examine the synthesized materials. The selective and sensitive detection of Ni 2+ using the RLS intensity was performed at 533 nm under the optimum conditions consisting of both 25 mg L –1 N-GQDs and 2.5 mg L –1 DMG in the ammonium buffer solution of pH 9.0. The linearity of Ni 2+ was 50.0–200.0 μg L –1 with a regression line, y = 5.031 x – 190.4 ( r 2 = 0.9948). The limit of detection (LOD) and the limit of quantitation (LOQ) were determined to be 20.0 and 60.0 μg L –1 , respectively. The method precision expressed as % RSDs was 4.90 for intraday ( n = 3 × 3) and 7.65 for interday ( n = 5 × 3). This developed method afforded good recoveries of Ni 2+ in a range of 85–108% when spiked with real water samples. Overall, this innovative method illustrated the identification and detection of Ni 2+ as a DMG complex with N-GQDs, and the detection was highly sensitive and selective.

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“…The XRD pattern confirmed the existence of large peaks at 2θ = 26.18°, which was related to the amorphous nature and disordered carbons of N-GQDs. 47 …”

Section: Resultsmentioning

confidence: 99%

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

et al. 2021

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“…PL behavior of S, N-GQDs depends upon both the carbon core and surface functional groups. 79 The PL mechanism is also based on the free zig-zag sites. Pan et al 80 prepared GQDs by hydrothermal cutting of GO and they obtained blue-emissive GQDs based on the free zig-zag sites effect.…”

Section: Optical Propertiesmentioning

confidence: 99%

Recent advances in heteroatom-doped graphene quantum dots for sensing applications

2021

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“…Currently, GR-QDs that emit fluorescence at various wavelengths can be prepared by controlling the experimental conditions. Compared with traditional QDs, GR-QDs are chemically inert and have low toxicity, good biocompatibility, water solubility photo-bleaching, unique structure and excellent GR characteristics [160,161]. The surface of GR-QDs usually contains oxygen-containing groups, such as –OH and –COOH, which are beneficial to further functional applications.…”

Section: Carbon-based Nanomaterialsmentioning

confidence: 99%

Carbon-Based Nanomaterials in Sensors for Food Safety

et al. 2019

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Food safety is one of the most important and widespread research topics worldwide. The development of relevant analytical methods or devices for detection of unsafe factors in foods is necessary to ensure food safety and an important aspect of the studies of food safety. In recent years, developing high-performance sensors used for food safety analysis has made remarkable progress. The combination of carbon-based nanomaterials with excellent properties is a specific type of sensor for enhancing the signal conversion and thus improving detection accuracy and sensitivity, thus reaching unprecedented levels and having good application potential. This review describes the roles and contributions of typical carbon-based nanomaterials, such as mesoporous carbon, single-or multi-walled carbon nanotubes, graphene and carbon quantum dots, in the construction and performance improvement of various chemo-and biosensors for various signals. Additionally, this review focuses on the progress of applications of this type of sensor in food safety inspection, especially for the analysis and detection of all types of toxic and harmful substances in foods.

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S,N co-doped graphene quantum dots-induced ascorbic acid fluorescent sensor: Design, characterization and performance

Cited by 72 publications

References 38 publications

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

Recent advances in heteroatom-doped graphene quantum dots for sensing applications

Carbon-Based Nanomaterials in Sensors for Food Safety

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