Transition Metal Complexes as Ammonia Responsive Materials for SAW Chemical Sensors
In the present paper we describe the development of a surface acoustic wave (SAW) ammonia sensor which utilizes the Rh2(form)4 complex as responding material. It has observed that the SAW resonance frequency shifted reversibly upwards upon NH3 exposures at room temperature. Moreover, the greater affinity of the Rh2(form)4 film coating for the N-Lewis bases guaranteed a selective binding capability towards NH3 in the presence of water vapour, allowing to monitor the concentration of ammonia gas in the head-space of aqueous solutions.
KeywordsSurface Acoustic Wave Transition Metal Complex Resonance Frequency Shift Ammonia Sensor Responsive Material
The work was funded by the University of Messina under the framework of the project “PRA Interdisciplinare 2007”.
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