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首页> 外文期刊>IEEE sensors journal >Dynamic Pressure/Temperature Behaviour of GaN-Based Chemical Sensors
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Dynamic Pressure/Temperature Behaviour of GaN-Based Chemical Sensors

机译：GaN的化学传感器的动态压力/温度行为

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Long-term operation of chemical sensors under dynamic pressure/temperature conditions for industrial or environmental monitoring is desirable and yet rarely achieved. We have investigated long-term (>20 hours) operation of a novel ion sensor technology under varying temperature and pressure conditions whilst controlling for chemical effects by use of chemically inert hydrocarbon oil as the sensor analyte. The gallium nitride-based transistor-like sensor technology under study has previously been demonstrated for sensing a wide-range of heavy metal and nutrient ions and offers potential improvements regarding chemical stability but until now only short-term testing (1 to 3 hours) in water has been reported, and not under multi-variate environmental conditions. We investigated the response under varying. We show that for measurements under continuously cycling pressure (between 10.3 and 172.3 bar) and temperature (between 30 and 60 degrees C) conditions, within any two-hour observation window, the sensor response is linear and repeatable with a high coefficient of determination. Furthermore the temperature dependence strongly dominates the pressure dependence. However, when the observation window during pressure and/or temperature variation is extended to approximately 20 hours, anomalous variations in response that are uncorrelated to any environmental conditions (temperature and pressure which were measured, and light and ions, which were not present) become evident. Yet this anomalous behaviour is not present when the pressure and temperature are invariant. This finding has significant implications for implementing these sensors in dynamic environments.
机译：在工业或环境监测的动态压力/温度条件下，化学传感器的长期运行是理想的，但很少实现。我们已经在不同温度和压力条件下调查了新型离子传感器技术的长期（> 20小时）操作，同时通过使用化学惰性烃油作为传感器分析物来控制化学效果。先前已经证明了正在研究的氮化镓基晶体管状传感器技术，用于感测宽范围的重金属和营养离子，并提供关于化学稳定性的潜在改进，但直到现在只有短期试验（1至3小时）已经报道了水，而不是在多变化的环境条件下。我们调查了不同的反应。我们表明，对于在任何两小时观察窗口内连续循环压力（10.3和172.3条）和温度（30至60℃）条件下的测量，传感器响应是线性和可重复的，具有高的测定系数。此外，温度依赖性强烈地占压力依赖性。然而，当压力和/或温度变化期间的观察窗口延伸到大约20小时时，对任何环境条件（测量的温度和压力和光和离子的温度和压力）不相关的反应响应的异常变化成为明显。然而，当压力和温度不变时，这种异常行为不存在。该发现对在动态环境中实现这些传感器具有显着影响。

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