Laser Deposition of Tetrasulfonated Phthalocyanine Layers for Gas Sensors

Premysl Fitl, Martin Vrnata, Dusan Kopecky, Jan Vlcek, Jitka Skodova, Jaroslav Hofmann, Vladimir Myslik

Department of Physics and Measurement.
Department of Physics and Measurement, Institute of Chemical Technology.
Department of Solid-State Engineering, Institute of Chemical Technology.

DOI: 10.4236/ampc.2012.24B023                

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 E_L = 0.1 to 0.5 J.cm^-2) from dimethylsulfoxide matrix. For both materials the ablation threshold E_L-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.

Keywords

Matrix Assisted Pulsed Laser Evaporation; Substituted Phthalocyanines; Gas Sensors; Impedance Measurement

Conflicts of Interest

The authors declare no conflicts of interest.

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