Fig. 2
Pronounced pH dependency of PL intensity of CdTe QDs immobilized within the PA hydrogel, λex = 450 nm (a), schematic sensor chamber of microfluidic setup (top view) (b) and photo of built setup taken under white light (c) and UV-light (d). Large pH deviations sensed by the PL intensity when alternately changing the buffer from pH 10.0 to 5.5 (8 cycles) (e). pH dependent PL changes measured by FLIM of CdTe-PA gel in buffers with pH 7.0, 9.0 and 11.0, respectively (f)