Abstract
Langmuir–Blodgett (LB) films of general organic semiconductor materials may be used as gas sensors because the conductivity depends on the presence of some gas species. Praseodymium bis[phthalocyaninato] complex-based LB films are very sensitive to the change of nitrogen dioxide(NO 2) gas concentration. In the paper, a new kind of sandwich-like praseodymium bis[2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyaninato] complex Pr[Pc ∗] 2 ( Pc ∗= Pc (OC 8H 17) 8) was used as film-forming material. It is found that a mixture of Pr[Pc ∗] 2 and octadecanol (OA) with 1:6 molar ratio formed an excellent material for the fabrication of gas-sensing LB film. The sensitive property of Pr[Pc ∗] 2 LB films to NO 2 gas was monitored by the change of resistance during gas exposure. The detecting range was from 0 to 100 ppm, and the response time of 11-layer Pr[Pc ∗] 2 LB film to 20 ppm NO 2 was 27 s at room temperature. Factors affecting gas-sensing properties of Pr[Pc ∗] 2 LB films to NO 2 gas such as temperature, number of film layers and processing conditions were also discussed in the paper.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call