Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3

Jing Wang, Saiying Fan, Yi Xia, C. Yang, Sridhar Komarneni

Research output: Contribution to journalArticle

Abstract

Gas sensors play vital roles in air pollution monitoring. Despite considerable progress in improving the room-temperature gas sensing sensitivities and rates of materials, comparably less attention is paid to the sensor selectivity. Here, ultrathin ZnO nanorods (˜15 nm) were synthesized by a nanoseed-assisted wet chemical approach and subsequently functionalized by Au nanoparticles by a photoreduction method. The hybrid material exhibited visible-light-activity owing to the surface plasmon resonance (SPR) effects of Au nanoparticles. The ZnO/Au hybrids were assembled into a high-performance, optically-controlled gas sensor operating at room temperature, which was found to be more selective to NH3 in dark but showed high selectivity to NO2 under visible-light illumination (λ = 532 nm). Moreover, the sensors exhibited high response and short response and recovery times as well as excellent reversibility and selectivity at room temperature. Such visible-light-modulated dual gas selectivity could be mainly attributed to the opposite direction of electron transfer between ZnO and Au nanoparticles in dark and under visible-light illumination, which led to the different surface depletion characteristics of the ZnO nanorods. In addition, the ultrathin diameters of nanorods also synergistically contributed to the light-controlled dual gas selectivity. The presently developed light modulation strategy provides an alternative approach to highly-selective and dual-functional gas sensors operating at room temperature.

Original languageEnglish (US)
Article number120919
JournalJournal of Hazardous Materials
Volume381
DOIs
StatePublished - Jan 5 2020

Fingerprint

Nanotubes
Temperature sensors
Chemical sensors
Nanorods
Gases
sensor
Light
Temperature
gas
Nanoparticles
temperature
Operating Rooms
Lighting
Light modulation
Hybrid materials
Sensors
Surface plasmon resonance
pollution monitoring
Air pollution
Surface Plasmon Resonance

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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title = "Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3",
abstract = "Gas sensors play vital roles in air pollution monitoring. Despite considerable progress in improving the room-temperature gas sensing sensitivities and rates of materials, comparably less attention is paid to the sensor selectivity. Here, ultrathin ZnO nanorods (˜15 nm) were synthesized by a nanoseed-assisted wet chemical approach and subsequently functionalized by Au nanoparticles by a photoreduction method. The hybrid material exhibited visible-light-activity owing to the surface plasmon resonance (SPR) effects of Au nanoparticles. The ZnO/Au hybrids were assembled into a high-performance, optically-controlled gas sensor operating at room temperature, which was found to be more selective to NH3 in dark but showed high selectivity to NO2 under visible-light illumination (λ = 532 nm). Moreover, the sensors exhibited high response and short response and recovery times as well as excellent reversibility and selectivity at room temperature. Such visible-light-modulated dual gas selectivity could be mainly attributed to the opposite direction of electron transfer between ZnO and Au nanoparticles in dark and under visible-light illumination, which led to the different surface depletion characteristics of the ZnO nanorods. In addition, the ultrathin diameters of nanorods also synergistically contributed to the light-controlled dual gas selectivity. The presently developed light modulation strategy provides an alternative approach to highly-selective and dual-functional gas sensors operating at room temperature.",
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Room-temperature gas sensors based on ZnO nanorod/Au hybrids : Visible-light-modulated dual selectivity to NO2 and NH3. / Wang, Jing; Fan, Saiying; Xia, Yi; Yang, C.; Komarneni, Sridhar.

In: Journal of Hazardous Materials, Vol. 381, 120919, 05.01.2020.

Research output: Contribution to journalArticle

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T2 - Visible-light-modulated dual selectivity to NO2 and NH3

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AU - Xia, Yi

AU - Yang, C.

AU - Komarneni, Sridhar

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