TITLE:
Laser Deposition of Tetrasulfonated Phthalocyanine Layers for Gas Sensors
AUTHORS:
Premysl Fitl, Martin Vrnata, Dusan Kopecky, Jan Vlcek, Jitka Skodova, Jaroslav Hofmann, Vladimir Myslik
KEYWORDS:
Matrix Assisted Pulsed Laser Evaporation; Substituted Phthalocyanines; Gas Sensors; Impedance Measurement
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.2 No.4B,
January
16,
2013
ABSTRACT: Thin layers of nickel and copper tetrasulfonated phthalocyanines (NiPcTS and CuPcTS) were prepared by Matrix Assisted Pulsed Laser Evaporation method. The depositions were carried out with KrF excimer laser (energy density of laser radiation EL = 0.1 to 0.5 J.cm-2) from dimethylsulfoxide matrix. For both materials the ablation threshold EL-th was determined. The following properties of deposited layers were characterized: a) chemical composition (FTIR spectra); b) morphology (SEM and AFM portraits); c) impedance of gas sensors based on NiPcTS and CuPcTS layers in the presence of two analytes - hydrogen and ozone. The prepared sensors exhibit response to 1000 ppm of hydrogen and 100 ppb of ozone even at laboratory temperature.