Hydrogen sensing properties of a GaN/AlGaN-based Schottky diode with a catalytic platinum (Pt) hybrid structure
| Autor: | Wei-Cheng Chen, Wen-Chau Liu, Jing-Shiuan Niu, Shiou-Ying Cheng, I-Ping Liu, Bu-Yuan Ke |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Metals and Alloys Analytical chemistry chemistry.chemical_element Schottky diode Heterojunction 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hydrogen sensor 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry Materials Chemistry Electrical and Electronic Engineering Thin film 0210 nano-technology Platinum Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 331:129320 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2020.129320 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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