At low temperatures (450–500 °C), the resistance of the sensor was not stable in zone B and had a decreasing trend.
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A selective ultrahigh responding high temperature ethanol sensor using TiO2 nanoparticles.
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The sentences
At low temperatures (450–500 °C) the sensitivity of the sensors towards C 2 H 5 OH was not constant and had an increasing trend as it can be seen in zone B in Figure 6b .