研究目的
To fabricate un-doped and Sn-doped hierarchical ZnO particles with high dispersity by a facile liquid reaction and evaluate their gas-sensing properties, particularly for ethanol detection.
研究成果
The study successfully synthesized un-doped and Sn-doped hierarchical ZnO particles with high dispersity using a facile liquid reaction. The Sn-doped ZnO exhibited excellent gas-sensing performance to ethanol, with a low detection limit of 10 ppm at 250°C. The method is facile, flexible, and operable, suggesting potential for synthesizing other metal oxide-based applications.
研究不足
The study focuses on the synthesis and gas-sensing properties of Sn-doped ZnO hierarchical particles, with limited exploration of other dopants or applications beyond ethanol sensing. The scalability and long-term stability of the sensors were not addressed.
1：Experimental Design and Method Selection:
A facile liquid reaction method was employed to synthesize un-doped and Sn-doped hierarchical ZnO particles. The influence of reaction parameters such as temperature, calcination temperature, and dopant concentration on the morphology of ZnO structures was investigated.
2：Sample Selection and Data Sources:
The samples were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze their structure and morphology.
3：List of Experimental Equipment and Materials:
SEM and XRD were used for characterization. The synthesis involved Zn(NO3)2, NaOH, SnCl4·5H2O, and ethanol.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing NaOH solution with Zn(NO3)2 solution under vigorous stirring, followed by calcination. Sn-doped ZnO was synthesized by adding SnCl4·5H2O to Zn(NO3)2 solution before adding NaOH.
5：Data Analysis Methods:
The gas response of the sensor was defined as Ra/Rg, where Ra is the resistance in air and Rg is the resistance in a gas atmosphere. The sensitivity to ethanol was measured at various concentrations and temperatures.
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