High sensitivity and anti-humidity gas sensor for nitrogen dioxide based on Ce/SnO2 nanomaterials

In this paper, the SnO 2 and Ce/SnO 2 nanomaterials are synthesized through a simple hydrothermal route and used for detecting NO 2 gas . The SnO 2 materials exhibit a good linearity for NO 2 detection, and the limit of detection is calculated to be as low as about 5 ppb at 10% humidity. The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications . The NO 2 gas sensing response of SnO 2 and Ce/SnO 2 also are investigated at 50% humidity. The Ce/SnO 2 materials show higher response than pure SnO 2 . The gas sensing mechanism of Ce/SnO 2 material is discussed in detailed. The reach results provide a new way for increasing the anti-humidity of the metal oxide semiconductor gas sensor.