Abstract
Co3O4 hollow spheres prepared by ultrasonic spray pyrolysis were converted into Co3O4-SnO2 core-shell hollow spheres by galvanic replacement with subsequent calcination at 450 °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 °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 °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 core-shell 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. (Figure Presented).
| Original language | English |
|---|---|
| Pages (from-to) | 7877-7883 |
| Number of pages | 7 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 8 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2016 Mar 30 |
Fingerprint
Keywords
- CoO
- galvanic replacement
- gas sensor
- heterostructure
- methylbenzene
- SnO
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Co3O4-SnO2 Hollow Heteronanostructures : Facile Control of Gas Selectivity by Compositional Tuning of Sensing Materials via Galvanic Replacement. / Jeong, Hyun Mook; Kim, Jae Hyeok; Jeong, Seong Yong; Kwak, Chang Hoon; Lee, Jong Heun.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 12, 30.03.2016, p. 7877-7883.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Co3O4-SnO2 Hollow Heteronanostructures
T2 - Facile Control of Gas Selectivity by Compositional Tuning of Sensing Materials via Galvanic Replacement
AU - Jeong, Hyun Mook
AU - Kim, Jae Hyeok
AU - Jeong, Seong Yong
AU - Kwak, Chang Hoon
AU - Lee, Jong Heun
PY - 2016/3/30
Y1 - 2016/3/30
N2 - Co3O4 hollow spheres prepared by ultrasonic spray pyrolysis were converted into Co3O4-SnO2 core-shell hollow spheres by galvanic replacement with subsequent calcination at 450 °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 °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 °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 core-shell 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. (Figure Presented).
AB - Co3O4 hollow spheres prepared by ultrasonic spray pyrolysis were converted into Co3O4-SnO2 core-shell hollow spheres by galvanic replacement with subsequent calcination at 450 °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 °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 °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 core-shell 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. (Figure Presented).
KW - CoO
KW - galvanic replacement
KW - gas sensor
KW - heterostructure
KW - methylbenzene
KW - SnO
UR - http://www.scopus.com/inward/record.url?scp=84963761912&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84963761912&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b00216
DO - 10.1021/acsami.6b00216
M3 - Article
VL - 8
SP - 7877
EP - 7883
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 12
ER -