Co3O4-SnO2 Hollow Heteronanostructures: Facile Control of Gas Selectivity by Compositional Tuning of Sensing Materials via Galvanic Replacement
- Authors
- Jeong, Hyun-Mook; Kim, Jae-Hyeok; Jeong, Seong-Yong; Kwak, Chang-Hoon; Lee, Jong-Heun
- Issue Date
- 30-3월-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- galvanic replacement; gas sensor; methylbenzene; Co3O4; SnO2; heterostructure
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.8, no.12, pp.7877 - 7883
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 8
- Number
- 12
- Start Page
- 7877
- End Page
- 7883
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89181
- DOI
- 10.1021/acsami.6b00216
- ISSN
- 1944-8244
- Abstract
- Co3O4 hollow spheres prepared by ultrasonic spray pyrolysis were converted into Co3O4-SnO2 coreshell hollow spheres by galvanic replacement with subsequent calcination at 450 degrees C for 2 h for gas sensor applications. Gas selectivity of the obtained spheres can be controlled by varying the amount of SnO2 shells (14.6, 24.3, and 43.3 at. %) and sensor temperatures. Co3O4 sensors possess an ability to selectively detect ethanol at 275 degrees C. When the amount of SnO2 shells was increased to 14.6 and 24.3 at. %, highly selective detection of xylene and methylbenzenes (xylene + toluene) was achieved at 275 and 300 degrees C, respectively. Good selectivity of Co3O4 hollow spheres to ethanol can be explained by a catalytic activity of Co3O4; whereas high selectivity of Co3O4-SnO2 coreshell hollow spheres to methylbenzenes is attributed to a synergistic effect of catalytic SnO2 and Co3O4 and promotion of gas sensing reactions by a pore-size control of microreactors.
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