Figure 1: Fabrication of the solvatochromic sensor system.

(a) Schematic representation of the colorimetric sensor system. (b) Fabrication of polyacrylic acid (PAA)-protected polydiacetylene (PDA) film on a glass substrate.

(a) Schematic representation of the colorimetric sensor system. (b) Fabrication of polyacrylic acid (PAA)-protected polydiacetylene (PDA) film on a glass substrate.