Abstract
Langmuir–Blodgett (LB) films of amino-tri- tert-butyl-phthalocyanine (AmBuPc) were fabricated. The gas sensitivities of the low-conducting LB films were measured in different concentrations of NO 2 atmosphere. The results showed that a good linear relationship exists between the logarithm of the resistance of AmBuPc gas sensor and the concentration of NO 2, which could be explained in terms of the gas diffusion theory in the LB films. XPS results proved that the attack centers of NO 2 are the two pyrrole N-linked free H atoms of the Pc macro-ring. Temperature had significant influences to the recovery and cyclic properties of sensor and the conductivity of gas sensor. The values of activation energy are 0.14 and 0.43 eV, respectively, at temperatures lower and higher than 60°C in NO 2.
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