Polyaniline Langmuir-Blodgett films

Zhang J, Burt DP, Whitworth AL, Mandler D, Unwin PR (2009) Polyaniline Langmuir-Blodgett films formation and properties. Phys Chem Chem Phys ll(18) 3490-3496. doi 10.1039/b819809h... 

Agbor NE, Cresswell JP, Petty MC, Monkman AP (1997) An opticeil gas sensor based on polyaniline Langmuir-Blodgett films. Sens Actuators B 41 137-141... 

Zhang, J., BmL D. R, Whitworth, A. L., Mandler, D., Unwin, P. R. Polyaniline Langmuir-Blodgett films Formation and properties. Phys. Chem. Chem. Phys. 2W9,11, 3490. 

Great attention has been paid to the construction of Langmuir-Blodgett films to be used in various sensors, e.g. metals, bound to imidazole- [97], azobenzene-containing [98], polyaniline [99] and other films. 

In one example, polyanUine (PAN) films were prepared by Langmuir-Blodgett (LB) and self-assembly (SA) techniques [109]. NO2 is an oxidizing gas, which oti contact with the ji-electron network of polyaniline results in the transfer of an electron from the polymer to the gas. When this occurs, the polymer becomes positively charged. The charge carriers thus created give rise to the increased conductivity of the films, and a concomitant decrease in resistance. The response time to NO2 and the relative change of resistance of films increase with increase of the number of film layers, as show in Fig. 33. Thin films allow more contact with NO2 than thick films, which increases the response time. 

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