Figure 1.

Preparation of the two-dimensional (2D) Au nanosphere arrays/glucose-sensitive hydrogel composite film: (a) 2D polystyrene (PS) colloidal monolayer arrays were fabricated on a clean glass slide by an air/water interfacial self-assembly method; (b) transferring the 2D PS monolayer arrays to a quartz slide; (c) depositing a layer of Au film on the 2D PS colloidal monolayer arrays; (d) annealing at 900 °C for 2 h; (e) pouring reaction solution into the 2D Au nanosphere arrays and subsequently photopolymerizing with UV light; (f) a free-standing 2D Au nanosphere arrays/hydrogel composite film was obtained by peeling it from the substrate; and (g) immersing as-prepared composite film into a poly(vinyl alcohol) PVA aqueous solution to crosslink it with PVA.