2021
DOI: 10.1007/s00604-021-05018-2
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(+)-Catechin-assisted graphene production by sonochemical exfoliation in water. A new redox-active nanomaterial for electromediated sensing

Abstract: A new green and effective sonochemical liquid-phase exfoliation (LPE) is proposed wherein a flavonoid compound, catechin (CT), promotes the formation of conductive, redox-active, water-phase stable graphene nanoflakes (GF). To maximize the GF-CT redox activity, the CT concentration and sonication time have been studied, and the best performing nanomaterialfraction selected. Physicochemical and electrochemical methods have been employed to characterize the morphological, structural, and electrochemical features… Show more

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Cited by 10 publications
(7 citation statements)
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“…The different structure and the higher exfoliation degree of the rGO-based HTs are further confirmed by the absence of the 2D peak in the only-GO film. 36…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The different structure and the higher exfoliation degree of the rGO-based HTs are further confirmed by the absence of the 2D peak in the only-GO film. 36…”
Section: Resultsmentioning
confidence: 99%
“…53 Fig. 5c depicts the selectivity study performed with the rGO–MoS 2 at −0.3 V; the aim was to assess both the direct effect of potentially interfering species 36 and test the perturbation of concomitant species on the H 2 O 2 detection (interferents are listed in the caption). No interferents tested returned detectable amperometric responses; more captivating the H 2 O 2 amperometric signals, obtained in the solution containing the spiked interferents, are similar to those before interference addition (H 2 O 2 signal recovery ≥ 96%).…”
Section: Resultsmentioning
confidence: 99%
“…Further, it could be seen that the linear relationship obtained between anodic and cathodic peaks vs. the scan rate ( Figure S1C ) proved that electron transfer was confined to the surface of the CB-RA modified electrode. The amount of RA attached to the CB surface was estimated using the Sharp approach [ 31 , 49 ], and thus a CB surface coverage (Г) of 1.95 × 10 −4 mol cm −2 was obtained (the equation used is detailed in the caption of Figure S1 ).…”
Section: Resultsmentioning
confidence: 99%
“…The observations led to the discovery of a mechanism behind CB-RA stabilization and the reduction in the moieties’ surface functionalization, which can be summarized as follows: (i) the ultrasound induces the untangling of bulk CB aggregates and agglomerates to nanosized particles; (ii) the aromatic skeleton of RA gives rise to π–π interactions within the C-C sp 2 domains of CB units; (iii) the residual RA polar moieties ensure hydrogen bonds with an aqueous phase; (iv) the reducing power of the RA cathecolic groups [ 27 , 31 ] drive AuNPs’ formation on the CB surface. Similarly, for SC, the steroid ring interacts with the CB surface, and the polar moieties (hydroxylic groups and carboxylic charged group) ensure the nanospheres’ colloidal dispersion in water [ 22 , 23 ]; further, the slightly bent but rigid structure of SC favors the interaction with the spherical shape of the CB nanoparticles [ 56 ].…”
Section: Resultsmentioning
confidence: 99%
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