On the interest of ambipolar materials for gas sensing

Abstract : Based on the electrochemical properties of a series of metallophthalocyanines this article shows that the phthalocyanine bearing four alkoxy groups and twelve fluorine atoms behaves approximately as those with eight fluorine atoms. This indicates that the electron-donating effect of one alkoxy group balances the electro-withdrawing effect of one fluorine atom. We engaged three metallophthalocyanines, namely the octafluoro copper phthalocyanine, Cu(F8Pc), an octaester metallophthalocyanine and a phthalocyanine bearing four alkoxy groups and twelve fluorine atoms, Zn(T4F12Pc), in building original conductometric transducers that are Molecular Semiconductor – Doped Insulator heterojunctions (MSDIs) in association with the highly conductive lutetium bisphthalocyanine, LuPc2. Whereas the octaester derivative and Zn(T4F12Pc) exhibited a negative response to ammonia, as expected for p-type materials, Cu(F8Pc) exhibited a particular behavior. At low humidity levels, 30 and 10% rh, the current of the Cu(F8Pc)/LuPc2 MSDI decreases, similarly to p-type devices, but at higher relative humidity values, 70% rh, the current increases under ammonia, which is the signature of a n-type behavior. This ambipolar behavior is unique amongst semiconducting sensing materials. This work opens the way to the study of ambipolar materials as sensing materials for the development of a new type of conductometric gas sensors.
Type de document :
Article dans une revue
Sensors and Actuators B: Chemical, Elsevier, 2017, 258, pp.657 - 664. 〈http://www.sciencedirect.com/science/article/pii/S0925400517322773〉. 〈10.1016/j.snb.2017.11.146〉
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01660985
Contributeur : Icmub - Université de Bourgogne <>
Soumis le : lundi 11 décembre 2017 - 15:40:59
Dernière modification le : vendredi 8 juin 2018 - 14:50:12

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Amélie Wannebroucq, Seydou Ouédraogo, Rita Meunier-Prest, Jean-Moïse Suisse, Mabinty Bayo, et al.. On the interest of ambipolar materials for gas sensing. Sensors and Actuators B: Chemical, Elsevier, 2017, 258, pp.657 - 664. 〈http://www.sciencedirect.com/science/article/pii/S0925400517322773〉. 〈10.1016/j.snb.2017.11.146〉. 〈hal-01660985〉

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