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Bi-functional co-sensitization of graphene oxide sheets and Ir nanoparticles on p-type Co3O4 nanofibers for selective acetone detection

Authors
Choi, SJ (Choi, Seon-Jin)Ryu, WH (Ryu, Won-Hee)Kim, SJ (Kim, Sang-Joon)Cho, HJ (Cho, Hee-Jin)Kim, ID (Kim, Il-Doo)
Issue Date
Nov-2014
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY B, v.2, no.41, pp.7160 - 7167
Journal Title
JOURNAL OF MATERIALS CHEMISTRY B
Volume
2
Number
41
Start Page
7160
End Page
7167
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147376
DOI
10.1039/c4tb00767k
ISSN
2050-7518
Abstract
We report the highly sensitive and selective acetone detection achieved by sensitizing p-type Co3O4 nanofibers (NFs) with Ir nanoparticles (NPs) and graphene oxide (GO) sheets for potential diagnosis of diabetes. Co3O4 NFs mixed with Ir NPs (1 wt%, average particle size 6 nm) were further functionalized by GO sheets (1 wt%) to investigate the dual-sensitization effect on cross sensitivity for acetone, pentane, NO, NH3, CO, and NO2. These Ir- and GO-co-functionalized Co3O4 NF composites exhibited a high acetone response (R-gas/R-air = 2.29) at 5 ppm. This value was 58% and 36% greater than that of the pristine Co3O4 NFs (R-gas/R-air = 1.45) and Ir-functionalized Co3O4 NFs (R-gas/R-air = 1.69), respectively. The detection limit of Ir- and GO-co-functionalized Co3O4 NF sensors is predicted to be as low as 120 ppb, presenting the response value of 1.18 at 300 degrees C. Furthermore, superior acetone selectivity, in competition with interfering gases such as pentane, NO, NH3, CO, and NO2, was investigated. This work demonstrates that optimized co-sensitization of two catalysts (i.e., Ir NPs and GO sheets) on p-type metal oxide NFs enables the precise detection of exhaled breath gases for the diagnosis of diabetes.
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공과대학 (화공생명공학부)
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