On the effect of ammonia and wet atmospheres on the conducting properties of different lutetium bisphthalocyanine thin films

• Published in: Thin solid films 2008-10, Vol.516 (24), p.9012-9019
• Main Authors: Parra, Vicente, Bouvet, Marcel, Brunet, Jérôme, Rodríguez-Méndez, María Luz, de Saja, José Antonio
• Format: Article
• Language: English
• Subjects: Ammonia; Bisphthalocyanine; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Gas sensor; General equipment and techniques; Humidity; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Langmuir–Blodgett; Mass flow rate; Physics; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Solid surfaces and solid-solid interfaces; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin films
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2007.11.092

In this article, we present new experimental data regarding the influence of ammonia (NH 3) and water (from wet atmospheres) in the conducting properties of lutetium bisphthalocyanine (LuPc 2)-based films in two very different structural features, namely Langmuir–Blodgett (LB) and vacuum evaporated (VE) films, deposited onto interdigitated electrodes. We pay particular attention to the effect of the mass flow rate ratios of the active gases, which certainly influence the mechanism of conduction of the chemiresistors. The particular trends observed are discussed on the basis of two main contributions: the electronic effects and the competition between gases in the adsorption process.