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.
Highlights
IntroductionMatrix Assisted Pulsed Laser Evaporation (MAPLE), introduced by Piqué et al in 1999, is one of the experimental laser deposition methods used for deposition of thin uniform films of organic [1] and even biological materials [2]
Matrix Assisted Pulsed Laser Evaporation (MAPLE), introduced by Piqué et al in 1999, is one of the experimental laser deposition methods used for deposition of thin uniform films of organic [1] and even biological materials [2].MAPLE is characterized by indirect contact of the laser radiation with deposited material
The depositions made by KrF laser in the range of energy density of laser radiation from 0.1 to 0.6∙cJm -2 can be assembled into a dependence of growth rate on laser fluence, known as the ablation curve (Figure 4)
Summary
Matrix Assisted Pulsed Laser Evaporation (MAPLE), introduced by Piqué et al in 1999, is one of the experimental laser deposition methods used for deposition of thin uniform films of organic [1] and even biological materials [2]. The first one is the deposited material itself, the second is a matrix, which has majority representation (approximately 95% of target) and has usually a character of low molecular weight volatile solvent of the deposited material. When one selects proper method for depositing sensitive layer, there is a significant difference between them: while phthalocyanines are almost insoluble in all solvents, some of their substituted derivatives exhibit a good solubility in low molecular solvents. Due to this fact substituted phthalocyanines (unlike non-substituted ones) can be deposited by MAPLE method. Responses of prepared sensors to hydrogen and ozone are presented
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