Layer-by-layer self-assembly of tricobalt tetroxide-polymer nanocomposite toward high-performance humidity-sensing

In this paper, a humidity sensor with tricobalt tetroxide (Co3O4)/poly(sodium styrene sulfonate) (PSS) film coated was fabricated using layer-by-layer (LbL) nano self-assembly method. The nanostructural, surface morphology and the specific surface area of the LbL self-assembled Co3O4/PSS nanocomposi...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-07, Vol.711, p.652-658
Main Authors: Zhang, Dongzhi, Jiang, Chuanxing, Sun, Yan'e, Zhou, Qu
Format: Article
Language:English
Subjects:
Composite film
Construction materials
Detection
Diffraction
Humidity
Humidity sensing
Layer-by-layer self-assembly
Materials selection
Nanocomposites
Nanostructure
Recovery time
Relative humidity
Reproducibility
Scanning electron microscopy
Self-assembly
Sorption
Synergistic effect
Transmission electron microscopy
Tricobalt tetroxide
Water chemistry
X-ray diffraction
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Summary:In this paper, a humidity sensor with tricobalt tetroxide (Co3O4)/poly(sodium styrene sulfonate) (PSS) film coated was fabricated using layer-by-layer (LbL) nano self-assembly method. The nanostructural, surface morphology and the specific surface area of the LbL self-assembled Co3O4/PSS nanocomposite were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen sorption analysis and transmission electron microscopy (TEM) measurements. The humidity sensing properties of the sensor were investigated by exposing to a wide relative humidity range of 11–97% at room temperature. The experimental results indicate that the presented sensor not only exhibited favorable response of up to 2479.97, but also possessed fast response and recovery time, acceptable repeatability and stability. The sensing performance was greatly better than that of pure Co3O4. Moreover, the possible humidity sensing mechanism can ascribed to the synergistic effect of Co3O4 and PSS toward water molecules, as well as the layered nanostructure. This work highlights the LbL self-assembled Co3O4/PSS film is a candidate material for constructing humidity sensors with high performance for various applications. •Co3O4/PSS nanocomposite film is fabricated by layer-by-layer self-assembly route.•Co3O4/PSS film exhibits higher humidity-sensing performance than that of Co3O4.•Humidity-sensing mechanism of Co3O4/PSS nanocomposite is investigated.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.03.365