Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk-shell spheres

Jun Sik Kim; Ji Wook Yoon; Young Jun Hong; Yun Chan Kang; Faissal Abdel-Hady; A. A. Wazzan; Jong Heun Lee

doi:10.1016/j.snb.2016.02.003

Highly sensitive and selective detection of ppb-level NO₂ using multi-shelled WO₃ yolk-shell spheres

Jun Sik Kim, Ji Wook Yoon, Young Jun Hong, Yun Chan Kang, Faissal Abdel-Hady, A. A. Wazzan, Jong Heun Lee

Research output: Contribution to journal › Article › peer-review

80 Citations (Scopus)

Abstract

Triple-shelled, double-shelled, and dense WO₃ spheres were prepared by ultrasonic spray pyrolysis and their NO₂ gas sensing characteristics were investigated. Triple-shelled WO₃ yolk-shell spheres showed an unprecedentedly high response (resistance ratio = 100-49.0) to 50 ppb NO₂ at 100-200 °C with negligible cross-responses to 5 ppm acetone, CO, NH₃, ethanol, and toluene, whereas dense WO₃ spheres showed low NO₂ response (8.9-3.1). The response and selectivity to NO₂ were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO₃ spheres to several tens ppb levels NO₂ was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells.

Original language	English
Pages (from-to)	561-569
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	229
DOIs	https://doi.org/10.1016/j.snb.2016.02.003
Publication status	Published - 2016 Jun 28

Keywords

NO sensor
Oxide semiconductor
WO
Yolk-shell sphere

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1016/j.snb.2016.02.003

Cite this

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title = "Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk-shell spheres",

abstract = "Triple-shelled, double-shelled, and dense WO3 spheres were prepared by ultrasonic spray pyrolysis and their NO2 gas sensing characteristics were investigated. Triple-shelled WO3 yolk-shell spheres showed an unprecedentedly high response (resistance ratio = 100-49.0) to 50 ppb NO2 at 100-200 °C with negligible cross-responses to 5 ppm acetone, CO, NH3, ethanol, and toluene, whereas dense WO3 spheres showed low NO2 response (8.9-3.1). The response and selectivity to NO2 were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO3 spheres to several tens ppb levels NO2 was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells.",

keywords = "NO sensor, Oxide semiconductor, WO, Yolk-shell sphere",

author = "Kim, {Jun Sik} and Yoon, {Ji Wook} and Hong, {Young Jun} and Kang, {Yun Chan} and Faissal Abdel-Hady and Wazzan, {A. A.} and Lee, {Jong Heun}",

note = "Funding Information: This work is supported by the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU) , under grant No. 2-135-36-HiCi , and a National Research Foundation of Korea (NRF) grant funded by the Korean Government (MEST) (No. 2013R1A2A1A01006545 ). The authors, therefore, acknowledge the technical and financal support of KAU and MEST. Publisher Copyright: {\textcopyright} 2016 Elsevier B.V. All rights reserved.",

year = "2016",

month = jun,

day = "28",

doi = "10.1016/j.snb.2016.02.003",

language = "English",

volume = "229",

pages = "561--569",

journal = "Sensors and Actuators, B: Chemical",

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publisher = "Elsevier",

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T1 - Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk-shell spheres

AU - Kim, Jun Sik

AU - Yoon, Ji Wook

AU - Hong, Young Jun

AU - Kang, Yun Chan

AU - Abdel-Hady, Faissal

AU - Wazzan, A. A.

AU - Lee, Jong Heun

N1 - Funding Information: This work is supported by the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU) , under grant No. 2-135-36-HiCi , and a National Research Foundation of Korea (NRF) grant funded by the Korean Government (MEST) (No. 2013R1A2A1A01006545 ). The authors, therefore, acknowledge the technical and financal support of KAU and MEST. Publisher Copyright: © 2016 Elsevier B.V. All rights reserved.

PY - 2016/6/28

Y1 - 2016/6/28

N2 - Triple-shelled, double-shelled, and dense WO3 spheres were prepared by ultrasonic spray pyrolysis and their NO2 gas sensing characteristics were investigated. Triple-shelled WO3 yolk-shell spheres showed an unprecedentedly high response (resistance ratio = 100-49.0) to 50 ppb NO2 at 100-200 °C with negligible cross-responses to 5 ppm acetone, CO, NH3, ethanol, and toluene, whereas dense WO3 spheres showed low NO2 response (8.9-3.1). The response and selectivity to NO2 were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO3 spheres to several tens ppb levels NO2 was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells.

AB - Triple-shelled, double-shelled, and dense WO3 spheres were prepared by ultrasonic spray pyrolysis and their NO2 gas sensing characteristics were investigated. Triple-shelled WO3 yolk-shell spheres showed an unprecedentedly high response (resistance ratio = 100-49.0) to 50 ppb NO2 at 100-200 °C with negligible cross-responses to 5 ppm acetone, CO, NH3, ethanol, and toluene, whereas dense WO3 spheres showed low NO2 response (8.9-3.1). The response and selectivity to NO2 were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO3 spheres to several tens ppb levels NO2 was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells.

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