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Abstract
A new kind of sandwich-like erbium bis[2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyaninato] complex Er[Pc ∗] 2 ( Pc ∗= Pc (OC 8H 17) 8; R=OC 8H 17) is used as film-forming material. The behaviors of pure Er[Pc ∗] 2 monolayer and Er[Pc ∗] 2 and stearic acid-mixed monolayer on pure water and 10 −4 M Cd 2+ subphases are investigated. Langmuir–Blodgett (LB) films based on Er[Pc ∗] 2 were deposited onto quartz substrate and planar interdigitated electrode substrate, and the characteristic and gas-sensing property of LB films are studied. It is found that a mixture of 1:6 Er[Pc ∗] 2/cadmium stearate (CS) forms an excellent material for the fabrication of gas-sensing LB films, giving uniformly deposited multilayers by Y-type deposition, transfer ratio is close to 1. The sensitive property of Er[Pc ∗] 2/CS mixed LB films to nitrogen dioxide (NO 2) gas is monitored by the change of conductivity during gas exposure. Erbium bis[phthalocyaninato] complex-based LB films are very sensitive to the change of NO 2 gas. The response time of 11-layer LB film to 100 ppm NO 2 is 20 s at room temperature.
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