Response mechanism for surface acoustic wave gas sensors based on surface-adsorption.

Response mechanism for surface acoustic wave gas sensors based on surface-adsorption.
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DOI:
10.3390/s140406844
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发表时间:
2014-04-16
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Lu Y
Lu Y
中科院分区:
其他
文献类型:
--
作者:
Liu J;Lu Y

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建立了基于探测器表面物理吸附的声表面波(SAW)气体传感器响应机理的理论模型。利用Wohljent方法描述了传感器输出(声表面波振荡器的频移)与探测器表面负载质量的关系。引入Brunauer-Emmett-Teller(BET)公式及其改进形式来描述气体在探测器表面的吸附行为。将这两种方法结合起来,得到了声表面波气体传感器响应机理的理论模型。利用商用声表面波气相色谱(GC)分析仪,对不同浓度的二甲基甲基膦酸二甲酯(DMMP)引起的频率漂移进行了测量。通过对实验结果的拟合,给出了模型中的参数,理论曲线与实验数据吻合较好。
A theoretical model is established to describe the response mechanism of surface acoustic wave (SAW) gas sensors based on physical adsorption on the detector surface. Wohljent's method is utilized to describe the relationship of sensor output (frequency shift of SAW oscillator) and the mass loaded on the detector surface. The Brunauer-Emmett-Teller (BET) formula and its improved form are introduced to depict the adsorption behavior of gas on the detector surface. By combining the two methods, we obtain a theoretical model for the response mechanism of SAW gas sensors. By using a commercial SAW gas chromatography (GC) analyzer, an experiment is performed to measure the frequency shifts caused by different concentration of dimethyl methylphosphonate (DMMP). The parameters in the model are given by fitting the experimental results and the theoretical curve agrees well with the experimental data.
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