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Photophysical properties of the sensing materials. The sensor foils were treated with acidic/basic buffer solution, pH 4/9. Prior to measuring ΦF, the foils were acidified with HCl vapour.
| Sensor | λmax exc/nm acidic/basic | λmax em/nm acidic/basic | ΦFacidic |
|---|---|---|---|
| Silica gel beads in D4 hydrogel | 572/583 | 598/609 | 0.65 |
| Cross-linked poly(HEMA) beads in linear poly(HEMA) | 576/592 | 601/612 | 0.61 |
