Abstract
A new, highly sensitive and selective hydrogen gas (H2) sensor based on birnessite-type manganese oxide (δ-MnO2) nanoflakes was prepared. The δ-MnO2 nanoflakes sensor selectively detected H2 with detection limits in air of 150ppb at 200°C and 7.5ppm at room temperature. In addition, the sensor also exhibited a considerable response to H2 in an N2 atmosphere. The sensor rapidly responded to trace levels of H2 gas and displayed reversible recovery, while the detected H2 concentrations could be accurately calculated using a modified Langmuir isotherm adsorption equation. The influence of the temperature and humidity on the sensing performance of the sensor was also investigated. The mechanism of the sensor is based on the oxidation of H2O and H2 accompanied by the formation and oxidation of MnOOH. It is believed that the low detection limit, high selectivity and fast reversible response of the δ-MnO2 nanoflake sensor are important benefits that make this sensor a promising candidate for H2 leak detection.
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