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Sensing properties of a WO 3 -based potentiometric NO x sensor were investigated in both N 2 and simulated exhaust gas. A positive voltage response was obtained for NO 2 but negative for NO at 650°C with the n-type semiconducting WO 3 -based sensor. The sensor was able to selectively detect NO in the presence of CO 2 in 3% O 2 and at 650°C. The...
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