Improved Hydrogen Sensing Performance of AlGaN/GaN Based Gas Sensors with Controlled Surface Nanostructures of Platinum Nanoparticulate Films
In: Journal of Nanoscience and Nanotechnology, Jg. 20 (2020-04-01), S. 2503-2507
Online
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Zugriff:
A simple and convenient method for the formation of Pt nanoparticulate films as a sensing material by controlling deposition rates is demonstrated to realize AlGaN/GaN high electron mobility transistor-based high-sensitivity hydrogen gas sensors. The Pt nanoparticulate films produced at a low deposition rate (Sample 1: 0.3 A/s) exhibit a smooth surface and uniformly sized Pt grains, while the films produced at a high deposition rate (Sample 2: 1.5 A/s) consist of bigger Pt grains and more coalesced grains on the surface. The deposition rate has a distinct effect on the surface morphology. The maximum current change percentage for sample 1 is 2.1×10³% at a VGS of -4.3 V while that for sample 2 is 4.4×10³% at a VGS of -4.5 V. Sample 2 has a two times larger current response to hydrogen gas than sample 1, which results from a large increase in channel conduction induced by a huge catalytic surface area of Pt nanoparticulate films. This technique offers an alternative method for the facile deposition of a sensing material and is potentially useful in various applications, such as gas, chemical, and biological sensors.
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Improved Hydrogen Sensing Performance of AlGaN/GaN Based Gas Sensors with Controlled Surface Nanostructures of Platinum Nanoparticulate Films
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Autor/in / Beteiligte Person: | Yun, Ju-Hyung ; Cho, Chu-Young ; Park, Hyeong-Ho ; Koh, Yumin ; Kumar, Manjeet ; Kyung Ho Park |
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Zeitschrift: | Journal of Nanoscience and Nanotechnology, Jg. 20 (2020-04-01), S. 2503-2507 |
Veröffentlichung: | American Scientific Publishers, 2020 |
Medientyp: | unknown |
ISSN: | 1533-4880 (print) |
DOI: | 10.1166/jnn.2020.17200 |
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