Graphene oxide and CuO double quantum dot composites (GOQD-q-CuO) with enhanced haloperoxidase-like activity and its application in colorimetric detection of H2O2 and glucose

References

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1095Graphene oxide and CuO double quantum dot composites (GOQD-q-CuO) with enhanced haloperoxidase-like activity and its application in colorimetric detection of H2O2 and glucosehttps://doi.org/10.1016/j.matchemphys.2020.124126CompositeGraphene oxide and CuO double quantum dot composites

Materials

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1095GOQD-q-CuOnmTEMTypical TEM images are displayed in Fig. 1A and S1A, which show well-dispersed, uniform, and spherical GOQD and q-CuO with an average diameters of ~4–7 nm (Fig. 1B) and ~3–5 nm, respectively, which are consistent with previous reports [21,27]. The q-CuO are surrounded by GOQD, forming GOQD-q-CuO composites (Fig. S1B) because of the presence of GOQD surface functional groups, such as peripheral carboxylic groups [28]. The q-CuO are not spindle-shaped as reported elsewhere because precipitation from alcohol enables direct formation of CuO, unlike precipitation from aqueous solution that initially results in Cu(OH)2 formation [29,30]. The high resolution TEM image of GOQD-q-CuO (Fig. 1C) shows a 0.25 nm distance between neighboring lattice fringes, corresponding to the [002] planes of monoclinic CuO. The Energy dispersive spectra (EDS) and elemental mapping results of CuO/PCN nanocomposite further demonstrate the presence of C, O and Cu elements (Fig. 1D–G).

Kinetics

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1095GOQD-q-CuOPODABTS0.291mM2.85-8M/s10951095
1095GOQD-q-CuOPODTMB0.008mM5.82-6M/s0.231/s10951095
1095GOQD-q-CuOPODX-0.28mM9.92-7M/s3.98-21/s10951095
1095GOQD-q-CuOPODH2O20.02mM6.17-6M/s0.251/s10951095

Applications

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1095GOQD-q-CuOdetect glucoseglucoseColor5–400μM2.5μM
1095GOQD-q-CuOdetect glucoseH2O2Color2.5–200μM0.5μM