Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes

Ji Wook Yoon, Young Jun Hong, Gi Dae Park, Su Jin Hwang, Faissal Abdel-Hady, AbdulAziz A. Wazzan, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors by spray drying of aqueous droplets containing cobalt nitrate, palladium nitrate, citric acid, and ethylene glycol and subsequent heat treatment. Highly viscous gel spheres containing Co and Pd salts were successfully converted into multi thin-shelled Co<inf>3</inf>O<inf>4</inf> reactors uniformly loaded with Pd catalysts by the sequential combustion of carbon and decomposition of the metal salts from the outer to the inner regions during one-step heat treatment. The responses (resistance ratio) of the Pd-loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors to 5 ppm toluene and p-xylene were 30.8 and 64.2, respectively, and the selectivity values to toluene and p-xylene against ethanol interference (response ratio) were 14.5 and 30.1, respectively. The unprecedented high response and selectivity were attributed to the effective dissociation of less reactive methylbenzenes into more active smaller species assisted both by catalytic Co<inf>3</inf>O<inf>4</inf> and Pd during the prolonged retention within the microreactors. Kilogram-scale preparation of noble metal-loaded multishelled microreactors and their unique gas-sensing characteristics based on a novel microreactor concept can pave a new way to design of high-performance gas sensors for practical applications.

Original languageEnglish
Pages (from-to)7717-7723
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number14
DOIs
Publication statusPublished - 2015 Apr 15

Fingerprint

Toluene
Xylene
Nitrates
Salts
Heat treatment
Spray drying
Ethylene Glycol
Citric acid
Precious metals
Ethylene glycol
Chemical sensors
Citric Acid
Palladium
Cobalt
Ethanol
Carbon
Gels
Gases
Metals
Decomposition

Keywords

  • gas sensor
  • kilogram-scale preparation
  • methylbenzenes
  • Pd-loaded Co<inf>3</inf>O<inf>4</inf>
  • selectivity
  • yolk-shell microreactor

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes. / Yoon, Ji Wook; Hong, Young Jun; Park, Gi Dae; Hwang, Su Jin; Abdel-Hady, Faissal; Wazzan, AbdulAziz A.; Kang, Yun Chan; Lee, Jong Heun.

In: ACS Applied Materials and Interfaces, Vol. 7, No. 14, 15.04.2015, p. 7717-7723.

Research output: Contribution to journalArticle

Yoon, Ji Wook ; Hong, Young Jun ; Park, Gi Dae ; Hwang, Su Jin ; Abdel-Hady, Faissal ; Wazzan, AbdulAziz A. ; Kang, Yun Chan ; Lee, Jong Heun. / Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes. In: ACS Applied Materials and Interfaces. 2015 ; Vol. 7, No. 14. pp. 7717-7723.
@article{9afaa001571d4830b0b6e4c1941d153c,
title = "Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co3O4 microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes",
abstract = "We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co3O4 microreactors by spray drying of aqueous droplets containing cobalt nitrate, palladium nitrate, citric acid, and ethylene glycol and subsequent heat treatment. Highly viscous gel spheres containing Co and Pd salts were successfully converted into multi thin-shelled Co3O4 reactors uniformly loaded with Pd catalysts by the sequential combustion of carbon and decomposition of the metal salts from the outer to the inner regions during one-step heat treatment. The responses (resistance ratio) of the Pd-loaded quintuple-shelled Co3O4 microreactors to 5 ppm toluene and p-xylene were 30.8 and 64.2, respectively, and the selectivity values to toluene and p-xylene against ethanol interference (response ratio) were 14.5 and 30.1, respectively. The unprecedented high response and selectivity were attributed to the effective dissociation of less reactive methylbenzenes into more active smaller species assisted both by catalytic Co3O4 and Pd during the prolonged retention within the microreactors. Kilogram-scale preparation of noble metal-loaded multishelled microreactors and their unique gas-sensing characteristics based on a novel microreactor concept can pave a new way to design of high-performance gas sensors for practical applications.",
keywords = "gas sensor, kilogram-scale preparation, methylbenzenes, Pd-loaded Co<inf>3</inf>O<inf>4</inf>, selectivity, yolk-shell microreactor",
author = "Yoon, {Ji Wook} and Hong, {Young Jun} and Park, {Gi Dae} and Hwang, {Su Jin} and Faissal Abdel-Hady and Wazzan, {AbdulAziz A.} and Kang, {Yun Chan} and Lee, {Jong Heun}",
year = "2015",
month = "4",
day = "15",
doi = "10.1021/acsami.5b00706",
language = "English",
volume = "7",
pages = "7717--7723",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "14",

}

TY - JOUR

T1 - Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co3O4 microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes

AU - Yoon, Ji Wook

AU - Hong, Young Jun

AU - Park, Gi Dae

AU - Hwang, Su Jin

AU - Abdel-Hady, Faissal

AU - Wazzan, AbdulAziz A.

AU - Kang, Yun Chan

AU - Lee, Jong Heun

PY - 2015/4/15

Y1 - 2015/4/15

N2 - We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co3O4 microreactors by spray drying of aqueous droplets containing cobalt nitrate, palladium nitrate, citric acid, and ethylene glycol and subsequent heat treatment. Highly viscous gel spheres containing Co and Pd salts were successfully converted into multi thin-shelled Co3O4 reactors uniformly loaded with Pd catalysts by the sequential combustion of carbon and decomposition of the metal salts from the outer to the inner regions during one-step heat treatment. The responses (resistance ratio) of the Pd-loaded quintuple-shelled Co3O4 microreactors to 5 ppm toluene and p-xylene were 30.8 and 64.2, respectively, and the selectivity values to toluene and p-xylene against ethanol interference (response ratio) were 14.5 and 30.1, respectively. The unprecedented high response and selectivity were attributed to the effective dissociation of less reactive methylbenzenes into more active smaller species assisted both by catalytic Co3O4 and Pd during the prolonged retention within the microreactors. Kilogram-scale preparation of noble metal-loaded multishelled microreactors and their unique gas-sensing characteristics based on a novel microreactor concept can pave a new way to design of high-performance gas sensors for practical applications.

AB - We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co3O4 microreactors by spray drying of aqueous droplets containing cobalt nitrate, palladium nitrate, citric acid, and ethylene glycol and subsequent heat treatment. Highly viscous gel spheres containing Co and Pd salts were successfully converted into multi thin-shelled Co3O4 reactors uniformly loaded with Pd catalysts by the sequential combustion of carbon and decomposition of the metal salts from the outer to the inner regions during one-step heat treatment. The responses (resistance ratio) of the Pd-loaded quintuple-shelled Co3O4 microreactors to 5 ppm toluene and p-xylene were 30.8 and 64.2, respectively, and the selectivity values to toluene and p-xylene against ethanol interference (response ratio) were 14.5 and 30.1, respectively. The unprecedented high response and selectivity were attributed to the effective dissociation of less reactive methylbenzenes into more active smaller species assisted both by catalytic Co3O4 and Pd during the prolonged retention within the microreactors. Kilogram-scale preparation of noble metal-loaded multishelled microreactors and their unique gas-sensing characteristics based on a novel microreactor concept can pave a new way to design of high-performance gas sensors for practical applications.

KW - gas sensor

KW - kilogram-scale preparation

KW - methylbenzenes

KW - Pd-loaded Co<inf>3</inf>O<inf>4</inf>

KW - selectivity

KW - yolk-shell microreactor

UR - http://www.scopus.com/inward/record.url?scp=84927950534&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927950534&partnerID=8YFLogxK

U2 - 10.1021/acsami.5b00706

DO - 10.1021/acsami.5b00706

M3 - Article

AN - SCOPUS:84927950534

VL - 7

SP - 7717

EP - 7723

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

SN - 1944-8244

IS - 14

ER -