Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 727, Issue -, Pages 514-521Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.08.147
Keywords
Co3O4/AlOOH; p-n junction; NOx; Gas sensor
Categories
Funding
- NSFC [21273063, 51303045]
- HLJNSF of Heilongjiang [1254-NCET-024]
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In this work, Co3O4/AlOOH composite materials were synthesized via a two-step method, where cobalt oxide/aluminum oxide intermediate was first synthesized by hydrothermal method, then followed by calcinations in air. The structure and morphology of the samples are characterized by XRD, FT-IR and TEM etc. The as-prepared Co3O4/AlOOH composite materials display special 2D nanosheets and mesopore structure. The small Co3O4 nanoparticles with sizes about 7 nm are highly dispersed on the surface of AlOOH. Mott-Schottky plots displaying the p-n junctions are existent in the composite materials. The gas sensing results reveal that the 1:9 Co3O4/AlOOH composite materials gas sensor shows significantly enhance NOx gas sensing performance. The Co3O4/AlOOH composite materials sensor shows responses of 57.8-7.5% to 100-0.1 ppm of NOx at room temperature. The outstanding NOx gas sensing performance may attribute to the structure of the Co3O4/AlOOH composite materials and the formation of the p-n junctions in materials. (C) 2017 Published by Elsevier B.V.
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