Colorimetric determination of ascorbic acid using a polyallylamine-stabilized IrO 2/graphene oxide nanozyme as a peroxidase mimic

References

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217Colorimetric determination of ascorbic acid using a polyallylamine-stabilized IrO 2/graphene oxide nanozyme as a peroxidase mimichttps://doi.org/10.1007/s00604-019-3897-4Compositepolyallylamine(PAH)-stabilized IrO2/graphene oxide(GO) nanozyme

Materials

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BET
b nanozyme
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217IrO21.70.3nmDLSThe average size of IrO2 nanoparticles was 1.7 ± 0.3 nm by counting more than 200 nanoparticles. The monodisperse IrO2 nanoparticles on GO indicated that GO had effectively inhibited the aggregation of IrO2 nanoparticles. There were no unsupported IrO2 nanoparticles observed, which indicated that the GO was an excellent support.

Kinetics

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T
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217IrO2/GOPODH2O22.0-8.00-805.19mM217217
217IrO2/GOPODTMB2.0-8.00-800.56mM217217

Applications

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217IrO2/GOdetection of AAAscorbic acid (AA)Color5-70Nm324nM
217IrO2/GOdetection of AAAscorbic acid (AA)Color5-70Nm324nMThe corresponding absorbance exhibited good linearity to the concentration of AA in the range of 5–70 μM with a coefficient of determination (R2) equal to 0.9931