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. 2019 Jan 22;9(2):140. doi: 10.3390/nano9020140

Figure 2.

Figure 2

Photograph (a) and SEM image (b) of the 2D Au nanosphere arrays (Inset: SEM image of the PS colloidal monolayer arrays template); photograph (c) and SEM image (d) of 2D Au nanosphere arrays/PBA-modified hydrogel composite film; (e) representative diffraction spectra of the 2D Au nanosphere arrays/PBA-modified hydrogel composite films in low ionic strength buffer solution at different glucose concentrations; and (f) glucose concentration dependence of the diffraction wavelength of the composite films (Inset: photographs of 2D Au nanosphere arrays/PBA-modified hydrogel composite films at different glucose concentrations. The scale bar is 0.15 cm). Error bars represent standard deviation (SD) of four samples.