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Acousto-electric and surface plasmon resonant responses from NOX-doped Langmuir-Blodgett films of macrocycles

The adsorption of nitrogen dioxide gas by Langmuir-Blodgett (LB) films of derivatives of phthalocyanine and dibenzotetra-aza-annulene has been monitored using quartz crystal oscillators, surface acoustic wave devices and surface plasmon resonance. Significant responses were observed from these films at relatively low concentrations of NOX (5-200 p.p.m.) and some possible advantages of using thin LB films have been indicated.