Sensors Based on Tin and Indium Oxides for the Determination of Acetone in Human Breath.

The properties of planar sensors based on tin dioxide and indium oxide used for the determination of acetone vapors have been studied. Sensors based on synthesized SnO and InO nanopowders showed high sensitivity to low concentrations of acetone in a humid environment which simulates human exhalation. The addition of a small amount of Au ions to hydroxide sols significantly increases the threshold sensitivity and the sensor response in a wide range of acetone concentrations.