2.2. Testing of Zn2+sensor stripsFor the fabrication of our PDA sensor strip, 1 was selected asthe detection probe due to the greatest CR reported by liposomesconjugated with it. To fabricate the sensor strip, PVDF strips wereimmersed in a chloroform solution containing 13.3% 1-conjugateddiacetylene (DA) monomers, 46.7% unmodified DA monomers and40% DMPE phospholipid. PVDF has been previously employed ina fluorescence PDA sensor [37] and was selected as our sensorsubstrate due to its robust and inert properties that allow it towithstand harsh chemical environments and intense UV exposure[37,38].