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相空间分析是获得传感器的动力学演化信息的有效方法。本文将稀土La3+掺杂的SnO2纳米带气敏响应曲线转化到相空间中的特性曲线,标定了相空间的特征参数,系统分析了La3+掺杂的SnO2纳米带器件的气敏响应动力学行为。研究表明,La3+掺杂的SnO2纳米传感器对丙酮、乙醇和乙二醇3种气体都具有良好的复原性;对乙二醇具有较高的灵敏度和优良的选择性;且随着浓度增加,传感器对乙二醇的吸附效率不足,而脱附效率明显,表现出一种排斥作用,不是理想的“依赖型”气敏传感器。通过相空间分析给出了理想传感器在相空间的动力学特征和模式识别特征,为设计和制作“依赖型”气敏元件提供了理论指导和判断依据。
Phase space analysis is an effective way to obtain the dynamic evolution of the sensor. In this paper, the gas sensing response of La3 + -doped SnO2 nanoribbons was transformed into the characteristic curve of phase space, and the characteristic parameters of the phase space were calibrated. The gas sensing response of La3 + -doped SnO2 nanoribbons was systematically analyzed. The results show that La3 + -doped SnO2 nanosensors have good recovery to acetone, ethanol and ethylene glycol, high sensitivity to ethylene glycol and good selectivity. With the increase of concentration, the sensor Ethylene glycol adsorption efficiency is insufficient, and the desorption efficiency is obvious, showing a repulsive effect, not the ideal “dependent ” gas sensor. Through the phase space analysis, the dynamic characteristics and pattern recognition characteristics of the ideal sensor in the phase space are given, which provide the theoretical guidance and judgment basis for the design and fabrication of the “dependent” gas sensor.