Langmuir–Blodgett films of poly[3-(butylthio)thiophene]: optical properties and electrical measurements in controlled atmosphere

Add time:07/12/2019    Source:sciencedirect.com

Experimental results on the gas-sensing properties of polymer thin films are presented. Langmuir–Blodgett films were formed from a 2:1 M mixture of poly[3-(butylthio)thiophene] (PBTT) and arachidic acid. A stable monolayer was prepared at 20°C on the water surface and it was reiteratively transferred onto various substrates by vertical dipping. The visible spectra of the films indicate a HOMO-LUMO separation of around 1.8 eV with an absorption maximum at about 520 nm. Electrical conductivity measurements performed in controlled atmosphere showed large gas sensitivity to electron-acceptor gases such as nitrogen dioxide at a working temperature of the active layer of about 50°C.

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