Highly sensitive and selective NO2 detection by Pt nanoparticles-decorated single-walled carbon nanotubes and the underlying sensing mechanism

In this study, we have demonstrated highly sensitive and selective NO2 gas sensors based on single-walled carbon nanotubes (SWCNTs) decorated with Pt nanoparticles (NPs) by applying a sputtering technique and sequential thermal treatment under atmosphere. The effect of the operating temperature on t...

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Veröffentlicht in:Sensors and actuators. B, Chemical Chemical, 2017-01, Vol.238, p.1032-1042
Hauptverfasser: Choi, Sun-Woo, Kim, Jaeseong, Byun, Young Tae
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Byun, Young Tae
description In this study, we have demonstrated highly sensitive and selective NO2 gas sensors based on single-walled carbon nanotubes (SWCNTs) decorated with Pt nanoparticles (NPs) by applying a sputtering technique and sequential thermal treatment under atmosphere. The effect of the operating temperature on the sensing capabilities of SWCNT sensors was determined by using NO2 as a representative oxidizing gas. In spite of higher NO2-response of SWCNT sensors at 100°C than that at room temperature (25°C), their sensing characteristics for all gases such as NO2, NO, C6H6, C7H8, C3H6O, CO, and NH3, respectively, were investigated at room temperature for actual sensing applications. In order to estimate the NO2-selectivity of Pt NPs-decorated SWCNT sensors, the cross-sensibilities of the fabricated sensors to 2ppm target gases were measured at room temperature. The sensing results revealed that sputtering and post-annealing techniques were an effective means of decorating SWCNT surfaces with catalytic Pt NPs; the significant improvement in NO2-detection (i.e., response and selectivity for NO2) of SWCNT sensors, owing to this decoration, was also confirmed. The methodology used in this study can pave the way for synthesizing various combinations of metal NPs and carbon-based nanostructured materials, which may be used as sensing materials for detecting hazardous gas species.
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B, Chemical</title><description>In this study, we have demonstrated highly sensitive and selective NO2 gas sensors based on single-walled carbon nanotubes (SWCNTs) decorated with Pt nanoparticles (NPs) by applying a sputtering technique and sequential thermal treatment under atmosphere. The effect of the operating temperature on the sensing capabilities of SWCNT sensors was determined by using NO2 as a representative oxidizing gas. In spite of higher NO2-response of SWCNT sensors at 100°C than that at room temperature (25°C), their sensing characteristics for all gases such as NO2, NO, C6H6, C7H8, C3H6O, CO, and NH3, respectively, were investigated at room temperature for actual sensing applications. In order to estimate the NO2-selectivity of Pt NPs-decorated SWCNT sensors, the cross-sensibilities of the fabricated sensors to 2ppm target gases were measured at room temperature. 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source Elsevier ScienceDirect Journals Complete
subjects Ammonia
Carbon
Catalysis
Decoration
Detection
Gas detectors
Gas sensors
Hazardous materials
Heat treatment
Metal oxides
Nanoparticles
Nanostructured materials
Nanotubes
Nitrogen dioxide
NO2
Operating temperature
Oxidation
Platinum
Pt nanoparticles
Selectivity
Sensors
Single wall carbon nanotubes
Single-walled carbon nanotubes
Sputtering
title Highly sensitive and selective NO2 detection by Pt nanoparticles-decorated single-walled carbon nanotubes and the underlying sensing mechanism
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