Highly Durable Chemoresistive Micropatterned PdAu Hydrogen Sensors: Performance and Mechanism

Hydrogen (H 2 ) is a promising alternative energy source for Net-zero, but the risk of explosion requires accurate and rapid detection systems. As the use of H 2 energy expands, sensors require high performance in a variety of properties. Palladium (Pd) is an attractive material for H 2 detection due to its high H 2 affinity and catalytic properties. However, poor stability caused by volume changes and reliability due to environmental sensitivity remain obstacles. This study proposes a micropatterned thin film of PdAu with optimized composition (Pd 0.62 Au 0.38 ) as a chemoresistive sensor to overcome these issues. At room temperature, the sensor has a wide detection range of 0.0002% to 5% and a fast response time of 9.5 s. Significantly, the sensor exhibits excellent durability for repeated operation (>35 h) in 5% H 2 and resistance to humidity and carbon monoxide. We also report a nega…