Before modification, the glass carbon electrode (GCE) was polished
with 0.3 and 0.05 m alumina powder, respectively, and then
cleaned ultrasonically in ethanol and twice-distilled water successively
and allowed to dry at room temperature. Subsequently,
Pt-Au-OSi@CS suspension prepared by dispersing in 0.5 wt.% CS
solution was dropped on the surface of GCE to achieve the Pt-Au-
OSi@CS/GCE. The preparation process of the sensor was shown in
Scheme 1.