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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

ref title DOI material type comment
4282 1095 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 https://doi.org/10.1016/j.matchemphys.2020.124126 Composite Graphene oxide and CuO double quantum dot composites

Materials

ref material size size err size unit size type size comment BET b nanozyme b 10n b unit specific act sa 10n sa unit comment
8160 1095 GOQD-q-CuO nm TEM Typical 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

ref material enzyme type substrate pH T km km err km 10n km unit vmax vmax err vmax 10n vmax unit kcat kcat err kcat 10n kcat unit kcat/km kcat/km 10n kcat/km unit comment
7062 1095 GOQD-q-CuO POD ABTS 0.291 mM 2.85 -8 M/s 1095 1095
7061 1095 GOQD-q-CuO POD TMB 0.008 mM 5.82 -6 M/s 0.23 1/s 1095 1095
7060 1095 GOQD-q-CuO POD X- 0.28 mM 9.92 -7 M/s 3.98 -2 1/s 1095 1095
7059 1095 GOQD-q-CuO POD H2O2 0.02 mM 6.17 -6 M/s 0.25 1/s 1095 1095

Applications

ref material application target method linear range linear ran unit LOD lod unit recovery comment
6004 1095 GOQD-q-CuO detect glucose glucose Color 5–400 μM 2.5 μM
6003 1095 GOQD-q-CuO detect glucose H2O2 Color 2.5–200 μM 0.5 μM


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