Abstract
Urchin-like Mg-doped ZnO nanowire networks were prepared by MgO-seeded vapor-phase growth of ZnO nanowires, and their potential as gas-sensing materials was investigated. The response (resistance ratio) of the urchin-like Mg-doped ZnO nanowire networks to 5 ppm C2H5OH at 350 °C was as high as 343, which is significantly higher than that of pure ZnO nanowire networks (7.0). In addition, the Mg-doped ZnO nanowire network sensors showed excellent selectivity to C2H5OH and an unprecedentedly high response (28.8) even to 0.25 ppm C2H5OH. The enhancement of the gas response and selectivity to C2H5OH was attributed to Mg-doping-induced decrease of the charge carrier concentration, the change of nanowire thickness/morphology, and the catalytic promotion of the C2H5OH sensing reaction.
Original language | English |
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Pages (from-to) | 527-534 |
Number of pages | 8 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 223 |
DOIs | |
Publication status | Published - 2016 Feb 1 |
Bibliographical note
Funding Information:This work is supported by the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), under grant No. 2-135-36-HiCi , and a National Research Foundation of Korea (NRF) grant funded by the Korea Government (MEST) (No. 2013R1A2A1A01006545 ). The authors, therefore, acknowledge the technical and financial support of KAU and MEST.
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
Keywords
- Gas response
- Gas sensor
- Mg-doped ZnO
- Oxide nanowire network
- Selectivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry