title: Single ZnO Nanowire-Based Gas Sensors to Detect Low Concentrations of Hydrogen.
abstract: Low concentrations of hazardous gases are difficult to detect with common gas sensors. Using semiconductor nanostructures as a sensor element is an alternative. Single ZnO nanowire gas sensor devices were fabricated by manipulation and connection of a single nanowire into a four-electrode aluminum probe in situ in a dual-beam scanning electron microscope-focused ion beam with a manipulator and a gas injection system in/column. The electrical response of the manufactured devices shows response times up to 29 s for a 121 ppm of H₂ pulse, with a variation in the nanowire resistance appreciable at room temperature and at 373.15 K of approximately 8% and 14% respectively, showing that ZnO nanowires are good candidates to detect low concentrations of H₂.
authors.affiliation: Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California 22800, Mexico. marlenenohemi@hotmail.com.
authors.forename: Marlene N
authors.initials: MN
authors.lastname: Cardoza-Contreras
authors.affiliation: Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California 22800, Mexico. jmromo@cnyn.unam.mx.
authors.forename: José M
authors.initials: JM
authors.lastname: Romo-Herrera
authors.affiliation: Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California 22860, Mexico. lrios@cicese.mx.
authors.forename: Luis A
authors.initials: LA
authors.lastname: Ríos
authors.affiliation: Departamento de Investigación en Física, Universidad de Sonora, Hermosillo 83000, Mexico. rgarcia@cifus.uson.mx.
authors.forename: R
authors.initials: R
authors.lastname: García-Gutiérrez
authors.affiliation: Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California 22800, Mexico. trino@cnyn.unam.mx.
authors.forename: T A
authors.initials: TA
authors.lastname: Zepeda
authors.affiliation: Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California 22800, Mexico. edel@cnyn.unam.mx.
authors.forename: Oscar E
authors.initials: OE
authors.lastname: Contreras
keywords: SEM-FIB; devices; hydrogen; nano-fabrication; nanowire; sensors