Abstract
A new kind of sandwich-like bis[2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyaninato] rare earth(III) complexes RE(Pc*) 2 (Pc*=Pc(OC 8H 17) 8, RE=Er, Sm, Tb) are used as film-forming materials. Pure RE(Pc*) 2 ultrathin films and RE(Pc*) 2 and octadecanol (OA)/stearic acid (SA) mixed ultrathin films were prepared by the Langmuir–Blodgett (LB) technique. The LB films were characterized by ultraviolet/visible (UV/Vis) spectroscopy and X-ray photoelectron spectroscopy (XPS). The NO 2 gas-sensing properties of Sm(Pc*) 2/OA LB film are studied compared with that of (i-PrO) 4CuPc LB film by XPS spectra and valence band spectra. It is found that the interaction between Sm(Pc*) 2 LB film and NO 2 gas is stronger than that between (i-PrO) 4CuPc LB film and NO 2 gas. Experimental results indicate that bis(phthalocyaninato) rare earth(III) complexes show more remarkable sensitivity than monophthalocyanine, which can be used in high-sensitive gas sensor applications. At the same time, the mechanism of sensitivity of Sm(Pc*) 2/OA mixed LB film to NO 2 gas is also studied in this paper.
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