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In this paper,pure polyaniline (PAN:Emeraldine base (EB) form) films and the mixed LB films of PAN and acetic acid (AA) with various layers were prepared by Langmuir-Blodgett (LB) technique.PAN based gas sensors were fabricated by deposited PAN based LB thin films on the interdigitated electrodes.The gas-sensitivity to NO_2 of PAN based gas sensors with different layers was studied.It is found that pure polyaniline LB films present higher sensitivity,responsivity and reversibility to NO_2 gas compared with polyaniline and acetic acid mixed LB films.The response time of 3-layer and 15-layer pure polyaniline LB films to 20μg/g NO_2 gas is about 10 s and 30 s,respectively.The recovery time of the 15-layer pure polyaniline LB films is close to 5 min.
In this paper, pure polyaniline (PAN: Emeraldine base (EB) form) films and the mixed LB films of PAN and acetic acid (AA) with various layers were prepared by Langmuir-Blodgett by deposited PAN based LB thin films on the interdigitated electrodes. gas-sensitivity to NO 2 of PAN based gas sensors with different layers was studied. It is found that pure polyaniline LB films present higher sensitivity, responsivity and reversibility to NO 2 gas compared with polyaniline and acetic acid mixed LB films. The response time of 3-layer and 15-layer pure polyaniline LB films to 20 μg / g NO 2 gas is about 10 s and 30 s. respectively. The recovery time of the 15-layer pure polyaniline LB films is close to 5 min.