Ultrathin CuxO nanoflakes anchored Cu2O nanoarray for high-performance non-enzymatic glucose sensor

Designing highly active material to fabricate high-performance glucose sensor was great importance for diabetes treatment. In this work, we develop a novel nanocomposite composed of multilevel nanostructure with ultrathin Cu x O nanoflakes anchored on Cu 2 O nanowires, directly on Cu foil and its application as non-enzymatic glucose sensor. Due to more active sites endowed by the ultrathin Cu x O nanoflakes, the as-prepared Cu x O nanoflakes/Cu 2 O nanowires@Cu nanoarray exhibit high sensitivity (3.59 mA mM −1  cm −2 ), low detection limit (0.69 μM), high selectivity, fast amperometric response (~ 2 s) and excellent reliability in human serum. And the sensitivity of ultrathin Cu x O nanoflakes/Cu 2 O nanowires@Cu nanoarray was 1.9-fold than that of Cu 2 O nanowires@Cu nanoarray. Such novel multilevel nanoarray synthesized by convenient method provides a facile way to design metal oxide nanomaterial for promising non-enzymatic glucose sensor.