Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 227, Issue -, Pages 149-156Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.12.014
Keywords
NiO; Nanofiber; Grain size; Gas sensor; Sensing mechanism
Funding
- Inha University
- PROTEC
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In this work, we confirmed the negligible influence of grain size on the gas-sensing capabilities of p-type semiconducting chemiresistive oxide gas sensors. For this purpose, p-type NiO nanofibers were synthesized by the electrospinning technique, and their sensing properties were investigated in terms of CO and NO2 (representative reducing and oxidizing gases, respectively) response, particularly as a function of the size of the nanograins existing in individual nanofibers. The size of the nanograins influenced the CO and NO2 response of the NiO nanofibers to only a small extent, in sharp contrast to its prominent influence on the sensor response of n-type semiconducting chemiresistive oxide gas sensors. The results not only confirm the established knowledge, but also provide a useful guideline for the fabrication of p-type oxide nanofiber-based chemical sensors. (C) 2015 Elsevier B.V. All rights reserved.
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