NDLI: Crystallinity dependent gas-sensing abilities of ZnO hollow fibers

Content Provider	Springer Nature Link
Author	Katoch, Akash Abideen, Zain Ul Kim, Jae Hun Kim, Sang Sub
Copyright Year	2016
Abstract	The grain size and crystallinity are important factors in considering the gas sensing properties of metal oxide based miniaturized gas sensors. This study reports the effects of the grain size and crystallinity on the CO sensing abilities of ZnO hollow fibers (HFs) synthesized by electrospinning. The grain size and crystallinity of the HFs were controlled by changing the heat treatment time during their synthesis and were characterized by SEM, TEM and XRD. Both the nanograin size and crystallinity of the HFs change significantly with increasing heat treatment time. Longer heat treatments result in improved sensing abilities irrespective of the evolution of larger-sized nanograins. Sensing measurements were carried out at various temperatures in the range 300-400 °C. The improved crystallinity likely compensates the adverse effects of grain growth in terms of the sensor response. That is, crystallinity rather than grain size, is the dominant factor determining the sensing abilities of HFs. This result provides useful guidelines for the fabrication of HF-based chemiresistive-type gas sensors.
Starting Page	942
Ending Page	946
Page Count	5
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	22
Issue Number	5
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2016-08-19
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ZnO hollow fiber crystallinity grain size gas sensor Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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