期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 12, 页码 7877-7883出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00216
关键词
galvanic replacement; gas sensor; methylbenzene; Co3O4; SnO2; heterostructure
资金
- National Research Foundation of Korea (NRF) - Korea Government (MEST) [2013R1A2A1A01006d545]
- National Research Foundation of Korea [2012H1A2A1017604, 2013R1A2A1A01006545] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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