Table 2.
ZnO-based electrochemical biosensors for hydrogen peroxide detection (HRP: horseradish peroxidase; Hb: hemoglobin; MP: microperoxidase; “/” in the table means the corresponding content is not provided.)
| Ref. | [27] | [20] | [28] | [29] | [30] | [31] | [32] | [23] | [33] |
|---|---|---|---|---|---|---|---|---|---|
| Enzyme/Electrode | HRP GCE |
HRP Ti |
MP graphite |
HRP GCE |
Hb GCE |
HRP GCE |
Hb GCE |
HRP GCE |
Hb GCE |
| Fabrication of ZnO | Wet chemical | Wet chemical | commercial | commercial | Wet chemical | Wet chemical | Hydro-thermal | Hydro-thermal | Wet chemical |
| ZnO structure | nanorods | nanowires | nanoparticles | nanoporous | nanosheet | flowerlike | Thin film | crystals | nanoparticles |
| Immobilization mode | Chemical adsorption | Physical adsorption | Entrapped | Entrapped | Entrapped | Entrapped | Entrapped | Electrostatic attraction | Entrapped |
| Working potential (V) | / | −0.4 | / | / | −0.675 | −0.3 | −0.39 | −0.2 | −0.28 |
| Response time (s) | / | 4 | 1.5 | <10 | / | <5 | / | <10 | <4 |
| KM (mM) | / | / | / | / | 0.143 | 1.76 | 0.0828 | / | 0.075 |
| Sensitivity (μA/ cm2·mM) | / | 237.8 | 0.041 μA/ mM | 43.8 | 137 | / | 1310 | 369 | / |
| Linear response range (μM) | 150–15000 | / | 0.1–800 | 5–2000 | 1–410 | 10–1100 | 0.2–12 | 1.5–450 | 0.19–1730 |
| Detection Limit (μM) | 0.115 | 0.2 | 0.03 | 2.5 | 10 | 9 | 0.084 | 0.7 | 0.097 |