title: Facile approaches to build ordered amphiphilic tris(phthalocyaninato) europium triple-decker complex thin films and their comparative performances in ozone sensing.
abstract: Solution processed thin films of an amphiphilic tris(phthalocyaninato) rare earth triple-decker complex, Eu(2)[Pc(15C5)(4)](2)[Pc(OC(10)H(21))(8)], have been prepared from three different methods: self-assembly (SA) annealed in solvent vapor, quasi-Langmuir-Shäfer (QLS) and drop casting methods. In particular, we successfully developed a simple QLS process for fabricating ordered multilayers with a good thickness control. The films prepared from three different methods were characterized by a wide range of methods including electronic absorption spectra, IR, X-ray diffraction, atomic force microscopy (AFM), and current-voltage (I-V) measurements. J-type aggregates have been formed with the increasing degree of order of molecular stacking Cast < QLS < SA films. Moreover, the gas sensing behavior of the three types of films was investigated towards ozone in the 8-300 ppb range. Unexpectedly good sensitive, stable and reproducible responses to O(3) gas are obtained for these kinds of ultra-thin solution processed films in a fast response/recovery cycle of only 1/4 min. The response of Eu(2)[Pc(15C5)(4)](2)[Pc(OC(10)H(21))(8)] films is linearly correlated to the ozone concentration. The interaction between the Eu(2)[Pc(15C5)(4)](2)[Pc(OC(10)H(21))(8)] films and different ozone concentrations was found to follow first-order kinetics. Strikingly, QLS films showed the most stable response and the largest average sensor response rate constant among the three types of films.
authors.affiliation: Institut de Chimie Moléculaire de l'Université de Bourgogne, CNRS UMR 5260, University of Bourgogne, 21078 Dijon, France.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Chen
authors.forename: Marcel
authors.initials: M
authors.lastname: Bouvet
authors.forename: Thibaut
authors.initials: T
authors.lastname: Sizun
authors.forename: Yingning
authors.initials: Y
authors.lastname: Gao
authors.forename: Cedric
authors.initials: C
authors.lastname: Plassard
authors.forename: Eric
authors.initials: E
authors.lastname: Lesniewska
authors.forename: Jianzhuang
authors.initials: J
authors.lastname: Jiang