Hydrogen sensing properties of a GaN/AlGaN-based Schottky diode with a catalytic platinum (Pt) hybrid structure

Wei Cheng Chen, Jing Shiuan Niu, I. Ping Liu, Bu Yuan Ke, Shiou Ying Cheng, Wen Chau Liu

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A new hydrogen sensor, based on a Schottky diode incorporated with a GaN/AlGaN heterostructure and catalytic platinum (Pt) hybrid metals, is fabricated and studied. The Pt hybrid metals include an evaporated Pt thin film and Pt nanoparticles (NPs). Pt NPs are formed by a solution-based process and an adequate post annealing treatment. The presence of Pt NPs gives the “spill-over” effect and increases the surface area/volume (SA/V) ratio and catalytic activity of the Pt metal. Hence, the related hydrogen sensing performance can be improved. Experimentally, a very high sensing response of 2.7 × 106 (@1% H2/air) with short response and recovery times of 17 s and 23 s and an extremely low detecting level of 1 ppm H2/air are obtained at 300 K. Widespread detecting ranges on the hydrogen concentration and operating temperature are acquired. Based on the theoretical analyses, an exothermic reaction of the hydrogen adsorption process with an activation energy Ea of 15.47 kJ/mol and an enthalpy change ΔH° of -11.4 kJ/mol for the studied Pt NP/Pt film/GaN/AlGaN device is observed. The studied device is therefore promising for high-performance hydrogen sensing applications.

期刊Sensors and Actuators, B: Chemical
出版狀態Published - 2021 三月 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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