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Sensors 2015, 15(12), 30539-30544; doi:10.3390/s151229816

Single ZnO Nanowire-Based Gas Sensors to Detect Low Concentrations of Hydrogen

1
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California 22800, Mexico
2
Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California 22860, Mexico
3
Departamento de Investigación en Física, Universidad de Sonora, Hermosillo 83000, Mexico
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 28 October 2015 / Revised: 25 November 2015 / Accepted: 1 December 2015 / Published: 4 December 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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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. View Full-Text
Keywords: nanowire; sensors; hydrogen; SEM-FIB; nano-fabrication; devices nanowire; sensors; hydrogen; SEM-FIB; nano-fabrication; devices
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cardoza-Contreras, M.N.; Romo-Herrera, J.M.; Ríos, L.A.; García-Gutiérrez, R.; Zepeda, T.A.; Contreras, O.E. Single ZnO Nanowire-Based Gas Sensors to Detect Low Concentrations of Hydrogen. Sensors 2015, 15, 30539-30544.

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