NSTI Nanotech 2009

Novel Nanostructures for Solid State Alcohol Breath Analyzers

A. Tricoli, M. Righettoni, S.E. Pratsinis
Swiss Federal Institute of Technology, CH

Keywords: solid solution, gas sensor, ethanol, humidity, selectivity


Solid state alcohol breath analyzers are commonly used by the law enforcement authorities, due to high sensitivity toward ethanol, their portability and fair response and recovery times. Common materials for the synthesis of the sensitive element are SnO2 nanoparticles with an avarage size below 15 nm. The main drawback of the exploitation of tin oxide as sensing material is its high cross-sensitivity to humidity, which requires expensive and elaborated systems for preparation of the gas probe. Here, novel sensing materials with high ethanol sensitivity and low cross-sensitivity to humidity are presented.
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