Figure 6
From: A green route to prepare fluorescent and absorbent nano-hybrid hydrogel for water detection
Optical image(a–d) indicates the high flexibility of hydrogel and optical image, (e–h) shows the fluorescence properties of hydrogel. Photographs of 0.32% aqueous solution of phosphorescent Eu2+/Dy3+ doped SrAl2O4 (right) and a water 100 times of hydrogel (left) under sunlight from 0 min (i), 5 min (j), 20 min (k) and 25 min (l) after mixing, respectively.
