Enhanced electrochemical response of carbon quantum dot modified electrodes

Algarra, Manuel; González‐Calabuig, Andreu; Radotić, Ksenija; Mutavdžić, Dragosav; Ania, Conchi O.; Lázaro-Martínez, Juan Manuel; Jiménez-Jiménez, José; Rodríguez‐Castellón, Enrique; Valle, Manel del

doi:10.1016/j.talanta.2017.09.082

Cited by 53 publications

(27 citation statements)

References 43 publications

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“…The direct 13 C polarization spectrum of the CQDs just reveals the graphitic section of sp 2 at a chemical shi of 128.3 ppm in a magnetic eld of 7 T, nevertheless, in the case of recording spectrum at 14 T, this spectrum presented further signals at 113.7 and 164.7 ppm, which are allocated to the lactol type carbon belonging to 5 and or six membered lactol ring and ester carbonyl carbon or the carboxylic acid group (-CO-O-R or -CO 2 H) based on the results obtained in previous studies on graphite oxide materials. 96…”

Section: Nuclear Magnetic Resonance Spectrummentioning

confidence: 99%

“…Finally, the decreased LOD equals 2.7 mM for DA. 136 Moreover, Yola et al (2019) developed an electrochemical sensor on the basis of the molecularly imprinted polymer/ graphitic carbon nitride/N-doped carbon dots composite (MIP/g-C 3 N 4 /NCDS) and has been applied to detect EP in the urine samples. In the following, EP imprinted voltammetric sensor on the graphitic carbon nitride/NCDS has been synthesized in the presence of 100.0 mM pyrrole consisting of 25.0 mM EP through CV.…”

Section: Applications Of Cqds and Gqdsmentioning

confidence: 99%

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Carbon and graphene quantum dots: a review on syntheses, characterization, biological and sensing applications for neurotransmitter determination

et al. 2020

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Section: Nuclear Magnetic Resonance Spectrummentioning

confidence: 99%

Section: Applications Of Cqds and Gqdsmentioning

confidence: 99%

Carbon and graphene quantum dots: a review on syntheses, characterization, biological and sensing applications for neurotransmitter determination

et al. 2020

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“…The 13 C direct polarization spectra show that the unique signal in each sample is present at a δ 13 C around 110-130 ppm ( Figure 9); this is common in graphitic materials [77][78][79][80]. The CD-RO and CD-PL samples once again show the highest and sharpest NMR signal, related to the higher degree of order within the organic structure.…”

Section: Characterisation Of Demineralised Char Concentratesmentioning

confidence: 89%

Assessment of Graphitized Coal Ash Char Concentrates as a Potential Synthetic Graphite Source

et al. 2020

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Coal ash char concentrates from four countries (Portugal, Poland, Romania, and South Africa) were prepared, characterised, and graphitized under the scope of the Charphite project (Third ERA-MIN Joint Call (2015) on the Sustainable Supply of Raw Materials in Europe). Coal ash chars may be a secondary raw material to produce synthetic graphite and could be an alternative to natural graphite, which is a commodity with a high supply risk. The char concentrates and the graphitized material derived from the char concentrates were characterised using proximate analysis, X-ray fluorescence, X-ray diffraction (structural), Raman microspectroscopy, solid-state nuclear magnetic resonance, scanning electron microscopy, and petrographic analyses to determine if the graphitization of the char was successful, and which char properties enhanced or hindered graphitization. Char concentrates with a lower proportion of anisotropic particles and a higher proportion of mixed porous particles showed greater degrees of graphitization. It is curious to see that embedded Al2O3 minerals, such as glass and clay, influenced graphitization, as they most likely acted as catalysts for crystal growth in the basal direction. However, the graphitized samples, as a whole, do not compare well against a reference natural graphite sample despite some particles in select char concentrates appearing to be graphitized following graphitization.

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“…Drop casting of carbon-based quantum particles, obtained by a green variant of Hummers' method, onto glassy carbon electrode (GCE) allows to construct a sensor for dopamine with a detection limit of 2.7 μM. 173 The sensitivity could be improved by employing β-cyclodextrin (CD) reaching a LoD of 140 nM. 174 N-doped CQDs, formed using diethanolamine as nitrogen and carbon source, coated onto GCE resulted finally in a dopamine sensor with a limit of detection of 1.2 nM 175 for use in urine and blood serum but also for eventual characteristic of living systems.…”

Section: Chemical Sensorsmentioning

confidence: 99%