High Selectivity Hydrogen Gas Sensor Based on WO(3)/Pd-AlGaN/GaN HEMTs.

High Selectivity Hydrogen Gas Sensor Based on WO(3)/Pd-AlGaN/GaN HEMTs.
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DOI:
10.3390/s23073465
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发表时间:
2023-03-26
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Kim H
Kim H
中科院分区:
其他
文献类型:
--
作者:
Nguyen VC;Cha HY;Kim H

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研究了基于AlGaN/GaN高电子迁移率晶体管(HEMTs)的高温传感氢气传感器。传感器的栅极区使用10 nm的Pd催化层进行功能化,用于氢气传感。为了提高传感器对氢气的选择性,在Pd层的顶部沉积了一层薄的WO_3层。在200℃时,该传感器对4%-H2的灵敏度高达658%,而与NO2、CH4、CO2、NH3和H2S的相互作用很小。从150°C到250°C,传感器的10ppm氢气响应至少是其他目标气体的8倍。这些结果表明,该传感器适用于高温复杂气体环境中的氢气检测。
We investigated the hydrogen gas sensors based on AlGaN/GaN high electron mobility transistors (HEMTs) for high temperature sensing operation. The gate area of the sensor was functionalized using a 10 nm Pd catalyst layer for hydrogen gas sensing. A thin WO3 layer was deposited on top of the Pd layer to enhance the sensor selectivity toward hydrogen gas. At 200 °C, the sensor exhibited high sensitivity of 658% toward 4%-H2, while exhibiting only a little interaction with NO2, CH4, CO2, NH3, and H2S. From 150 °C to 250 °C, the 10 ppm hydrogen response of the sensor was at least eight times larger than other target gases. These results showed that this sensor is suitable for H2 detection in a complex gas environment at a high temperature.
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