研究目的
To develop techniques for synthesizing an array of zinc oxide nanorods and to study the gas-sensitivity of the structures to organic solvent vapors.
研究成果
Zinc oxide nanorods synthesized by hydrothermal method show significant response to reducing gases at room temperature. The sensitivity is strongly affected by the thickness of the seed layer and the density of the ZnO nanorods array. The study suggests that nanostructures based on zinc oxide are promising materials for gas sensors operating at room temperature.
研究不足
The study focuses on the sensitivity to organic solvent vapors at room temperature, and the effect of the seed layer thickness and density of ZnO nanorods on sensitivity. Potential areas for optimization include the exploration of other gases and conditions.
1：Experimental Design and Method Selection:
Zinc oxide nanostructures were synthesized by two-stage chemical synthesis: the formation of seed layer and subsequent hydrothermal synthesis.
2：Sample Selection and Data Sources:
Solutions of zinc nitrate and hexamethylenetetramine with different equimolar concentrations were used as seed layers.
3：List of Experimental Equipment and Materials:
Scanning electron microscopy (SEM) for morphology study, Impedancemeter Z-500P for impedance spectra measurements.
4：Experimental Procedures and Operational Workflow:
The samples were annealed, synthesized, washed, and dried before measuring their gas-sensitive properties.
5：Data Analysis Methods:
The sensitivity was calculated as S = (Rair – Rgas)/Rgas, where Rair is the resistance of the sample in air, and Rgas is the resistance of the sample in the presence of a reagent gas.
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