Effect of central metal ions on interaction of Metal Phthalocyanines composites with chemical analytes

Metal Phthalocyanines (MPcs) undergo appreciable interaction mechanism with chemical analytes on account of their high sensitivity in terms of charge densities, optical and spectroscopic properties. In the present work, we aim to integrate the advantages of three MPcs with three different metal ions, similar functional group and a ligand attached to central metal ion to device chemresistor sensors. Four chemresistor devices were fabricated using permutation combinations of three MPcs; tetrasulfonic acid tetrasodium salt functionalized Nickel Phthalocyanine (NiPcS) and Copper Phtalocyanines (CuPcS) and Aluminium Phthalocyanine hydroxide (AlPcOH). The chemresistors were tested for surface-interface studies with an aromatic vapor benzene and strong oxidizing vapor bromine. For benzene, NiPcS–AlPcOH composite exhibited maximum sensitivity (≈ 2.73 ppm⁻¹) and for bromine, CuPcS–AlPcOH composite shows highest sensitivity (≈ 72 ppm⁻¹).