Abstract

AbstractThis paper discusses an integrated hybrid MEMS hydrogen sensor that detects hydrogen in the range from 5 ppm to 100 vol%. The sensor is a single chip comprising both capacitive and thermal conductivity hydrogen sensors that can be fabricated simultaneously using the same process flow. The capacitive sensor detected hydrogen at concentrations as low as 5 ppm without a heater. The thermal conductivity sensor measured high hydrogen concentrations and had a low power consumption of several tens of milliwatts. The integrated hybrid MEMS hydrogen sensor showed a high gas selectivity.

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