| Conţinutul numărului revistei |
| Articolul precedent |
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 SM ISO690:2012SCHUTT, Fabian, POSTICA, Vasile, ADELUNG, Rainer, LUPAN, Oleg. Single and Networked ZnO-CNT Hybrid Tetrapods for Selective Room-Temperature High-Performance Ammonia Sensors. In: ACS Applied Materials and Interfaces, 2017, vol. 9, pp. 23107-23118. ISSN -. DOI: https://doi.org/10.1021/acsami.7b03702 |
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  ACS Applied Materials and Interfaces |
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| Volumul 9 / 2017 / ISSN - /ISSNe 1944-8244 | ||||||
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| DOI:https://doi.org/10.1021/acsami.7b03702 | ||||||
| Pag. 23107-23118 | ||||||
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Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T-CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH3) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained. Additionally, the response and recovery times were improved (by decreasing them from 58 and 61 s to 18 and 35 s, respectively). The calculated lowest detection limit of 200 ppb shows the excellent potential of the ZnO-T-CNT networks as NH3 vapor sensors. Room temperature operation of such networked ZnO-CNT hybrid tetrapods shows an excellent long-time stability of the fabricated sensors. Additionally, the gas-sensing mechanism was identified and elaborated based on the high porosity of the used three-dimensional networks and the excellent conductivity of the CNTs. On top of that, several single hybrid microtetrapod-based devices were fabricated (from samples with 2.0 wt % CNTs) with the help of the local metal deposition function of a focused ion beam/scanning electron microscopy instrument. The single microdevices are based on tetrapods with arms having a diameter of around 0.35 μm and show excellent NH3 sensing performance with a gas response (Igas/Iair) of 6.4. Thus, the fabricated functional networked ZnO-CNT hybrid tetrapods will allow to detect ammonia and to quantify its concentration in automotive, environmental monitoring, chemical industry, and medical diagnostics. |
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| Cuvinte-cheie ammonia sensor, CNT, Hybrid, microsensor, networks, ZnO tetrapod |
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Dublin Core Export
<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Schutt, F.</dc:creator> <dc:creator>Postica, V.</dc:creator> <dc:creator>Adelung, R.</dc:creator> <dc:creator>Lupan, O.I.</dc:creator> <dc:date>2017-07-12</dc:date> <dc:description xml:lang='en'><p>Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T-CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH<sub>3</sub>) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained. Additionally, the response and recovery times were improved (by decreasing them from 58 and 61 s to 18 and 35 s, respectively). The calculated lowest detection limit of 200 ppb shows the excellent potential of the ZnO-T-CNT networks as NH<sub>3</sub> vapor sensors. Room temperature operation of such networked ZnO-CNT hybrid tetrapods shows an excellent long-time stability of the fabricated sensors. Additionally, the gas-sensing mechanism was identified and elaborated based on the high porosity of the used three-dimensional networks and the excellent conductivity of the CNTs. On top of that, several single hybrid microtetrapod-based devices were fabricated (from samples with 2.0 wt % CNTs) with the help of the local metal deposition function of a focused ion beam/scanning electron microscopy instrument. The single microdevices are based on tetrapods with arms having a diameter of around 0.35 μm and show excellent NH<sub>3</sub> sensing performance with a gas response (I<sub>gas</sub>/I<sub>air</sub>) of 6.4. Thus, the fabricated functional networked ZnO-CNT hybrid tetrapods will allow to detect ammonia and to quantify its concentration in automotive, environmental monitoring, chemical industry, and medical diagnostics.</p></dc:description> <dc:identifier>10.1021/acsami.7b03702</dc:identifier> <dc:source>ACS Applied Materials and Interfaces () 23107-23118</dc:source> <dc:subject>ammonia sensor</dc:subject> <dc:subject>CNT</dc:subject> <dc:subject>Hybrid</dc:subject> <dc:subject>microsensor</dc:subject> <dc:subject>networks</dc:subject> <dc:subject>ZnO tetrapod</dc:subject> <dc:title>Single and Networked ZnO-CNT Hybrid Tetrapods for Selective Room-Temperature High-Performance Ammonia Sensors</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>
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