On a Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures
| Autor: | Wei-Cheng Chen, Cheng-Jing Lai, Po-Cheng Chou, Huey-Ing Chen, Chun-Chia Chen, I-Ping Liu, Jian-Kai Liou, Wen-Chau Liu |
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| Rok vydání: | 2015 |
| Předmět: |
Fabrication
Materials science Nanostructure Hydrogen Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Schottky diode Nanotechnology Condensed Matter Physics Hydrogen sensor Fuel Technology Adsorption chemistry Surface roughness Transient response |
| Zdroj: | International Journal of Hydrogen Energy. 40:9006-9012 |
| ISSN: | 0360-3199 |
| Popis: | A new Pd/AlGaN/GaN Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures is fabricated and studied comprehensively. The employed pyramid-like Pd nanostructures cause the substantial increase of surface roughness and surface-to-volume aspect ratio which give the remarkable increase of adsorption sites on the surface for hydrogen molecules. Experimentally, the studied device with pyramid-like Pd nanostructures demonstrates enhanced hydrogen sensing performance, including a large forward-bias current variation of 1.95 × 10 −6 A and a high sensing response of 1454 under an introduced 1% H 2 /air gas at 300 K. These properties are remarkably superior to those of the conventional planar-surface device. In addition, an improved hydrogen detection limit of 10 ppb H 2 /air at 300 K is found for the studied device with pyramid-like Pd nanostructures. The related hydrogen sensing characteristics including transient responses and steady-state analysis are also studied in this work. Therefore, based on the improved sensing properties and advantages of low-cost, easy fabrication, and solid stability of operation, the studied device shows the promise for high-performance hydrogen sensing applications. |
| Databáze: | OpenAIRE |
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