Hydrothermally synthesized CeO2 nanowires for H2S sensing at room temperature.

CeO 2 nanowires were synthesized using a facile hydrothermal process without any surfactant, and their morphological, structural and gas sensing properties were systematically investigated. The CeO 2 nanowires with an average diameter of 12.5 nm had a face-centered cubic fluorite structure and grew along [111] of CeO 2 . At the room temperature of 25 °C, hydrogen sulfide (H 2 S) gas sensor based on the CeO 2 nanowires showed excellent sensitivity, low detection limit (50 ppb), and short response and recovery time (24 s and 15 s for 50 ppb H 2 S, respectively). [ABSTRACT FROM AUTHOR]