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. 2018 Dec 8;8(12):1025.
doi: 10.3390/nano8121025.

Hydrothermal Synthesis of CeO₂-SnO₂ Nanoflowers for Improving Triethylamine Gas Sensing Property

Dongping Xue  1   2 , Yan Wang  3 , Jianliang Cao  4 , Zhanying Zhang  5   6
Affiliations

Hydrothermal Synthesis of CeO₂-SnO₂ Nanoflowers for Improving Triethylamine Gas Sensing Property

Dongping Xue et al. Nanomaterials (Basel). .

Abstract

Developing the triethylamine sensor with excellent sensitivity and selectivity is important for detecting the triethylamine concentration change in the environment. In this work, flower-like CeO₂-SnO₂ composites with different contents of CeO₂ were successfully synthesized by the one-step hydrothermal reaction. Some characterization methods were used to research the morphology and structure of the samples. Gas-sensing performance of the CeO₂-SnO₂ gas sensor was also studied and the results show that the flower-like CeO₂-SnO₂ composite showed an enhanced gas-sensing property to triethylamine compared to that of pure SnO₂. The response value of the 5 wt.% CeO₂ content composite based sensor to 200 ppm triethylamine under the optimum working temperature (310 °C) is approximately 3.8 times higher than pure SnO₂. In addition, CeO₂-SnO₂ composite is also significantly more selective for triethylamine than pure SnO₂ and has better linearity over a wide range of triethylamine concentrations. The improved gas-sensing mechanism of the composites toward triethylamine was also carefully discussed.

Keywords: CeO2-SnO2; gas sensor; hydrothermal; nanostructure; triethylamine.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
XRD patterns of the samples.
Figure 2
Figure 2
Field-emission scanning electron microscopy (FESEM) images of pure SnO2 (a,b) and SC-5 nanocomposite (c,d) and the EDS images (e-h) of the SC-5 sample.
Figure 3
Figure 3
UV–vis absorption spectra of the synthesized SC-0 and SC-5 samples. The upper right corner inset is the relationship lines of (αhv)2 and hv.
Figure 4
Figure 4
The response of the synthesized samples to 200 ppm TEA at different operating temperatures.
Figure 5
Figure 5
(a) Response of the sensors to different TEA concentrations at 310 °C (the inset shows the response curve in the range of 20–200 ppm), (b) dynamic response-recover curves of the sensors to different TEA concentrations at 310 °C, (c) responses of the SC-0 and SC-5 sensors to five gases of 200 ppm, (d) long-term stability measurements of the SC-5 sensor to 200 ppm TEA at 310 °C.
Figure 6
Figure 6
TEA sensing mechanisms diagram of (a) pure SnO2 and (b) CeO2/SnO2 nanostructure.
Figure 7
Figure 7
Structure diagram of gas sensor.
See this image and copyright information in PMC

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