Fabrication of Low-Temperature ppb-Level Ethanol Gas Sensor Based on Hierarchical NiO-SnO2 Nanoflowers Under Hydrothermal Conditions
Liming Song, Xiaoxin Dou, Jianmei Shao, Yuanzheng Luo, Fumiao Liu, Chengyong Li, Lijuan Yan, Chuhong Wang, Yuting Li, Yuqing Cai, Jinsheng He, Zhenqing Dai, Ruikun Sun, Qin Xie
TL;DR
Researchers created a low-temperature ethanol gas sensor using NiO-SnO2 nanoflowers, which showed better performance than pure SnO2.
Contribution
A new ethanol gas-sensing material based on hierarchical NiO-SnO2 nanoflowers is introduced, offering improved performance at low temperatures.
Findings
Hierarchical NiO-SnO2 nanoflowers outperformed pure SnO2 nanoflowers in ethanol sensing at 164 °C.
The enhanced performance is attributed to p-n heterojunctions and catalytic effects of NiO.
The nanoflowers are promising for fabricating high-quality ethanol gas sensors.
Abstract
Hierarchical NiO-SnO2 nanoflowers were prepared via a one-step hydrothermal method. The morphology, structure and components of the hierarchical NiO-SnO2 nanoflowers were examined via scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The ethanol gas-sensing performance was systematically analyzed between pure hierarchical SnO2 nanoflowers and the hierarchical NiO-SnO2 nanoflowers. The results indicated that the hierarchical NiO-SnO2 nanoflowers showed better gas-sensing properties than the pure hierarchical SnO2 nanoflowers at 164 °C. The enhanced gas-sensing performance was ascribed to the formation of p-n heterojunctions between p-type NiO and n-type SnO2. Additionally, NiO has a catalytic role. Therefore, hierarchical NiO-SnO2 nanoflowers could be a potential gas-sensing…
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Taxonomy
TopicsGas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · Advanced Chemical Sensor Technologies