Reducing Gas Sensing Based on the Redox Interconversion of Neodymium (III) Chromate(V)

The novel sensing property of neodymium (III) chromate(V), NdCrO4, to methanol has been demonstrated. The electrical response of this compound did not rely on the surface potential change by the interaction with methanol gas, but was instead due to the redox interconversion of zircon-type NdCrVO4 to KDP-type NdH2CrIIIO4. The NdCrO4 film prepared on alumina substrates with 2.5-(mu)m thickness could respond to methanol of ppm order concentration with an apparent increase in electrical resistance.