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^*

^*Corresponding author for this work

Information Materials Engineering

Korea University
King Abdulaziz University

Research output: Contribution to journal › Journal article › peer-review

86 Scopus citations

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
State	Published - 2016.06.28

Keywords

NO sensor
Oxide semiconductor
WO
Yolk-shell sphere

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10.1016/j.snb.2016.02.003

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@article{942444a2351448c5b700094f7c104f03,

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\}",

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",

issn = "0925-4005",

}

TY - JOUR

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

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.

KW - NO sensor

KW - Oxide semiconductor

KW - WO

KW - Yolk-shell sphere

UR - https://www.scopus.com/pages/publications/84958746227

U2 - 10.1016/j.snb.2016.02.003

DO - 10.1016/j.snb.2016.02.003

M3 - Journal article

AN - SCOPUS:84958746227

SN - 0925-4005

VL - 229

SP - 561

EP - 569

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

ER -

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

Abstract

Keywords

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