“…60 There have been numerous studies demonstrating the application of MPc and MPc hybrid materials with SWCNT as sensing elements for the detection of different gases, however studies concerning the inuence of the central metal in the phthalocyanine molecules has been sporadic. [61][62][63] The effects of the central metal atom on gas sensor performance have been discussed for lms of tetra-(tert-butyl)-5,10,15,20-tetraazaporphyrins (MTAP(t-Bu) 4 ,M¼ Pd, Ni, Co), 61 1,8,15,22-tetra-iso-pentyloxyphthalocyanine (MPc(iso-PeO) 4 ,M ¼ Cu, Pb, Ni) 62 and etioporphyrins of Cu, Zn, Ni, Co, Pt, Pd. 63 In these studies the change of the resistance upon interaction with NH 3 was measured.…”