Synthesis, characterization, and ammonia gas sensing properties of Co3O4@CuO nanochains

The Co 3 O 4 @CuO composite nanochains (CCNCs) were fabricated by electrospinning approach and controlled annealing route. The formation of nanochains was attributed to the interactions between N , N -Dimethylformamide and metal ions (Cu 2+ or Co 2+ ) acted as a cross-linking point or a bridge among...

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Bibliographic Details
Published in:Journal of materials science 2017-04, Vol.52 (7), p.3757-3770
Main Authors: Zhou, Jiao, Zhang, Jiawei, Rehman, Afrasiab Ur, Kan, Kan, Li, Li, Shi, Keying
Format: Article
Language:English
Subjects:
Ammonia
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Cobalt oxides
Copper oxides
Crosslinking
Crystallography and Scattering Methods
Detection
Electric bridges
Electrical properties
Gas sensors
Materials Science
Nanoparticles
Original Paper
Polymer Sciences
Polyvinylpyrrolidone
Response time
Single crystals
Solid Mechanics
X ray photoelectron spectroscopy
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Summary:The Co 3 O 4 @CuO composite nanochains (CCNCs) were fabricated by electrospinning approach and controlled annealing route. The formation of nanochains was attributed to the interactions between N , N -Dimethylformamide and metal ions (Cu 2+ or Co 2+ ) acted as a cross-linking point or a bridge among the entangled polyvinylpyrrolidone (PVP) chains. The calcined samples were composed of porous single-crystal CuO particles (Ps), the size of which was 100–300 nm, and smaller p-type Co 3 O 4 nanoparticles (NPs) on the surface of Ps, which was characterized by XRD, FT-IR, RAMAN, XPS, BET, SEM, and TEM techniques. The electrical properties of the samples and the response to ammonia gas at room temperature (RT) have been investigated. The highest sensing response was up to 5.72 for 100 ppm NH 3 with a fast response time of 1.3 s, which was over 4.6 times higher than that of pristine CuO at RT, and the lowest detection limit was down to 1 ppm. In addition, the NH 3 gas sensing mechanism of CCNC-2 (Cu:Co molar ratio of 5:2) was also discussed. These results indicated that the Co 3 O 4 @CuO composite nanochains were promising candidates for reliable high-performance gas sensors at room temperature.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-016-0561-9