Rapid and Selective NH3 Sensing by Porous CuBr
Abstract Fast and selective detection of NH3 at parts‐per‐billion (ppb) concentrations with inexpensive and low‐power sensors represents a long‐standing challenge. Here, a room temperature, solid‐state sensor is presented consisting of nanostructured porous (78%) CuBr films. These are prepared by fl...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-04-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.201903390 |
| _version_ | 1811204736394723328 |
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| author | Andreas T. Güntner Markus Wied Nicolay J. Pineau Sotiris E. Pratsinis |
| author_facet | Andreas T. Güntner Markus Wied Nicolay J. Pineau Sotiris E. Pratsinis |
| author_sort | Andreas T. Güntner |
| collection | DOAJ |
| description | Abstract Fast and selective detection of NH3 at parts‐per‐billion (ppb) concentrations with inexpensive and low‐power sensors represents a long‐standing challenge. Here, a room temperature, solid‐state sensor is presented consisting of nanostructured porous (78%) CuBr films. These are prepared by flame‐aerosol deposition of CuO onto sensor substrates followed by dry reduction and bromination. Each step is monitored in situ through the film resistance affording excellent process control. Such porous CuBr films feature an order of magnitude higher NH3 sensitivity and five times faster response times than conventional denser CuBr films. That way, rapid (within 2.2 min) sensing of even the lowest (e.g., 5 ppb) NH3 concentrations at 90% relative humidity is attained with outstanding selectivity (30–260) over typical confounders including ethanol, acetone, H2, CH4, isoprene, acetic acid, formaldehyde, methanol, and CO, superior to state‐of‐the‐art sensors. This sensor is ideal for hand‐held and battery‐driven devices or integration into wearable electronics as it does not require heating. From a broader perspective, the process opens exciting new avenues to also explore other bromides and classes of semiconductors (e.g., sulfides, nitrides, carbides) currently not accessible by flame‐aerosol technology. |
| first_indexed | 2024-04-12T03:17:42Z |
| format | Article |
| id | doaj.art-7d8a420599a94ce580a15ee435df5731 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-04-12T03:17:42Z |
| publishDate | 2020-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-7d8a420599a94ce580a15ee435df57312022-12-22T03:50:00ZengWileyAdvanced Science2198-38442020-04-0177n/an/a10.1002/advs.201903390Rapid and Selective NH3 Sensing by Porous CuBrAndreas T. Güntner0Markus Wied1Nicolay J. Pineau2Sotiris E. Pratsinis3Particle Technology Laboratory Department of Mechanical and Process Engineering ETH Zurich Sonneggstrasse 3 Zurich 8092 SwitzerlandParticle Technology Laboratory Department of Mechanical and Process Engineering ETH Zurich Sonneggstrasse 3 Zurich 8092 SwitzerlandParticle Technology Laboratory Department of Mechanical and Process Engineering ETH Zurich Sonneggstrasse 3 Zurich 8092 SwitzerlandParticle Technology Laboratory Department of Mechanical and Process Engineering ETH Zurich Sonneggstrasse 3 Zurich 8092 SwitzerlandAbstract Fast and selective detection of NH3 at parts‐per‐billion (ppb) concentrations with inexpensive and low‐power sensors represents a long‐standing challenge. Here, a room temperature, solid‐state sensor is presented consisting of nanostructured porous (78%) CuBr films. These are prepared by flame‐aerosol deposition of CuO onto sensor substrates followed by dry reduction and bromination. Each step is monitored in situ through the film resistance affording excellent process control. Such porous CuBr films feature an order of magnitude higher NH3 sensitivity and five times faster response times than conventional denser CuBr films. That way, rapid (within 2.2 min) sensing of even the lowest (e.g., 5 ppb) NH3 concentrations at 90% relative humidity is attained with outstanding selectivity (30–260) over typical confounders including ethanol, acetone, H2, CH4, isoprene, acetic acid, formaldehyde, methanol, and CO, superior to state‐of‐the‐art sensors. This sensor is ideal for hand‐held and battery‐driven devices or integration into wearable electronics as it does not require heating. From a broader perspective, the process opens exciting new avenues to also explore other bromides and classes of semiconductors (e.g., sulfides, nitrides, carbides) currently not accessible by flame‐aerosol technology.https://doi.org/10.1002/advs.201903390breath analysisenvironmental monitoringgas sensorssemiconductorswearables |
| spellingShingle | Andreas T. Güntner Markus Wied Nicolay J. Pineau Sotiris E. Pratsinis Rapid and Selective NH3 Sensing by Porous CuBr Advanced Science breath analysis environmental monitoring gas sensors semiconductors wearables |
| title | Rapid and Selective NH3 Sensing by Porous CuBr |
| title_full | Rapid and Selective NH3 Sensing by Porous CuBr |
| title_fullStr | Rapid and Selective NH3 Sensing by Porous CuBr |
| title_full_unstemmed | Rapid and Selective NH3 Sensing by Porous CuBr |
| title_short | Rapid and Selective NH3 Sensing by Porous CuBr |
| title_sort | rapid and selective nh3 sensing by porous cubr |
| topic | breath analysis environmental monitoring gas sensors semiconductors wearables |
| url | https://doi.org/10.1002/advs.201903390 |
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