Fabrication, characterization and excellent formaldehyde gas sensing of Tb-doped In2O3 beaded-porous nanotubes

The pure and Tb-doped In 2 O 3 beaded-porous nanotubes (BPNTs) are fabricated by simple electrospinning method. The crystal phase, morphology and chemical composition of the obtained samples were analyzed by characteristic techniques (XRD, FE-SEM, TEM, EDS, XPS, etc.). The mechanism of forming BPNTs...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2018-11, Vol.29 (22), p.19111-19122
Main Authors: Duan, Haojie, He, Yue, Li, Shouchun, Liu, Li, Xu, Suyang, Li, Yu, Li, Haiying, Gong, Yimin, Liang, Qingcheng, Cheng, Yali
Format: Article
Language:English
Subjects:
Air pollution
Basicity
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Crystal defects
Detection
Ethanol
Formaldehyde
Gas sensors
Gases
Indium oxides
Lattice vacancies
Materials Science
Microscopy
Mineral oils
Morphology
Nanotubes
Nitrates
Optical and Electronic Materials
Organic chemistry
Outdoor air quality
Oxygen enrichment
Phase separation
Sensors
Spectrum analysis
X ray photoelectron spectroscopy
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Summary:The pure and Tb-doped In 2 O 3 beaded-porous nanotubes (BPNTs) are fabricated by simple electrospinning method. The crystal phase, morphology and chemical composition of the obtained samples were analyzed by characteristic techniques (XRD, FE-SEM, TEM, EDS, XPS, etc.). The mechanism of forming BPNTs structure was studied, and phase separation plays a key role in the process of formation. A series of sensing tests toward formaldehyde gas showed that 6 mol% Tb-doped In 2 O 3 BPNTs exhibited the best sensing performance: high response (75–50 ppm), shorter response and recovery times (2 s and 12 s), low limit of detection (LOD, 1.27–100 ppb), good selectivity and long-term stability, etc. The significantly improved gas sensing properties were mainly resulted from their high surface basicity, enriched defects (oxygen vacancies), small crystallite size and complex porous structures.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-018-0037-6