title: Titanium and Ruthenium Phthalocyanines for NO(2) Sensors: A Mini-Review.
abstract: This review presents studies devoted to the description and comprehension of phenomena connected with the sensing behaviour towards NO(2) of films of two phthalocyanines, titanium bis-phthalocyanine and ruthenium phthalocyanine. Spectroscopic, conductometric, and morphological features recorded during exposure to the gas are explained and the mechanisms of gas-molecule interaction are also elucidated. The review also shows how X-ray reflectivity can be a useful tool for monitoring morphological parameters such as thickness and roughness that are demonstrated to be sensitive variables for monitoring the exposure of thin films of sensor materials to NO(2) gas.
authors.affiliation: CNR Istituto di Struttura della Materia, Sede di Montelibretti, P.B. 10, 00016 Monterotondo Stazione, Italy; E-Mails:  gianna.pennesi@ism.cnr.it  (G.P.);  gentilina.rossi@ism.cnr.it  (G.R.).
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Paoletti
authors.forename: Giovanna
authors.initials: G
authors.lastname: Pennesi
authors.forename: Gentilina
authors.initials: G
authors.lastname: Rossi
authors.forename: Amanda
authors.initials: A
authors.lastname: Generosi
authors.forename: Barbara
authors.initials: B
authors.lastname: Paci
authors.forename: Valerio Rossi
authors.initials: VR
authors.lastname: Albertini