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Pristine, Au and Cu...
Pristine, Au and Cu Decorated Nanoporous NiO Films for Selective CO and NO2 Gas Sensing
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- Welearegay, Tesfalem (author)
- Uppsala universitet,Fasta tillståndets fysik,Uppsala Univ, Dept Mat & Sci Engn, Uppsala, Sweden.
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- Gloeckler, Johannes (author)
- Ulm Univ, Inst Analyt & Bioanalyt Chem, Ulm, Germany.
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- Padilla, Marta (author)
- JLM Innovat GmbH, Tubingen, Germany.
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- Mitrovics, Jan (author)
- JLM Innovat GmbH, Tubingen, Germany.
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- Mizaikoff, Boris (author)
- Ulm Univ, Inst Analyt & Bioanalyt Chem, Ulm, Germany.
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- Österlund, Lars, 1967- (author)
- Uppsala universitet,Fasta tillståndets fysik,Uppsala Univ, Dept Mat & Sci Engn, Uppsala, Sweden.
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(creator_code:org_t)
- IEEE, 2023
- 2023
- English.
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In: 2023 IEEE SENSORS. - : IEEE. - 9798350303872
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We report on a one-step, on-chip fabrication process of high-quality nanoporous p-type NiO thin films for gas sensing application. Highly nanoporous and polycrystalline NiO thin films were fabricated and deposited onto alumina substrates employing advanced gas deposition (AGD) technique. AGD-fabricated NiO films were further decorated with gold (AuNP) and copper (CuNP) nanoparticles, respectively. The nano-sensors array thus fabricated were integrated into a purpose-built hybrid senor unit that allows for in-situ conditioning and gas sensing measurement of volatile gases. The results revealed that the relative sensor responses of pure NiO towards CO gas exposures (reducing gas), were higher than the corresponding NP decorated NiO films. In contrast, AuNP decorated NiO sensors exhibited relatively higher sensor response towards oxidizing gases, NO2, than CuNP decorated and pure NiO based nano-sensors. It is noted that the relative sensor response changes are mainly governed by the high porosity of the as-fabricated NiO films and the corresponding grain-grain Schottky barriers. Limits of detection (LOD) was estimated to be 1.5 ppm for CO and 400 ppb for NO2 for pure and AuNP decorated NiO based sensors, respectively. The results are promising for further development of nanoporous p-type metal oxide sensors for specific volatile biomarkers detection, for example, in exhaled breath analysis for disease diagnosis.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Gas sensors
- nanoporous NiO
- Advanced gas deposition
- Reducing gases
- Oxidizing gases
- Breath analysis
Publication and Content Type
- ref (subject category)
- kon (subject category)
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