Herein, a single-step
production for the development of gas sensing
devices from unsubstituted and hexadecafluorinated metal phthalocyanines
(MPc, M = Fe2+ and Co2+) is explained. The preparation
of sensor devices by the direct growth of nanowires on interdigitated
electrodes by the vapor transport of the synthesized MPc precursors
is discussed, emphasizing a single-step approach. Results using as-prepared
devices for the detection of NH3 and NO2 in
the ppb range are shown. In agreement with similar MPc sensing materials,
response and recovery times fitted using a double-exponential model
gave two rate constants: a short one, on the order of minutes for
concentrations above 500 ppb, and a long one, on the order of hours.
These rate constants are suitable for environmental monitoring of
gases in recovery zones, where longer exposure times are critical
in the sampling process. Our F16FePc-NW sensor prototypes
show a ∼10% normalized response toward NH3 at 40
ppb for a measuring time of ∼2.5 h at room temperature and
measurable responses to concentrations as low as 5 ppb, rendering
them applicable to environmental studies.
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