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A reversible and selective resistive gas sensor using Nb-doped cryptomelane octahedral molecular sieves (Nb-OMS-2) nanofibers for room-temperature CO gas detection was developed. The electrical resistance of the Nb-OMS-2 nanofibers decreases… Click to show full abstract
A reversible and selective resistive gas sensor using Nb-doped cryptomelane octahedral molecular sieves (Nb-OMS-2) nanofibers for room-temperature CO gas detection was developed. The electrical resistance of the Nb-OMS-2 nanofibers decreases on exposure to CO gas. The sensor displayed response of 22% for 2 ppm and 91% for 400 ppm of CO gas in air. The average detection and recovery time were ~25 s for 200 ppm of CO at room temperature. The substitution of Mn with Nb in the OMS-2 framework, the formation of Nb-O-Mn bridge, and the reaction of CO with bridge oxygen are proposed to be responsible for high sensitivity and selectivity for CO gas in air.
Journal Title: IEEE Sensors Journal
Year Published: 2019
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