TY - JOUR
T1 - One-step synthesis of micro-/mesoporous SnO2 spheres by solvothermal method for toluene gas sensor
AU - Hermawan, Angga
AU - Asakura, Yusuke
AU - Inada, Miki
AU - Yin, Shu
N1 - Funding Information:
The present work was partially funded by the Japan Society for the Promotion of Science Grant-in-Aid for the Scientific Research (KAKENHI) on Innovative Areas “Mixed Anion” (No. 16H06439 , No. 16H06440 ), the Nippon Sheet Glass Foundation for Materials Science and Engineering , and by the Dynamic Alliance for Open Innovations Bridging Human, Environment and Materials , the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” . The authors also thank Dr. Y. Miura from the Center of Advanced Instrumental Analysis, Kyushu University, for the NMR measurement and analysis.
Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/8/15
Y1 - 2019/8/15
N2 - A facile solvothermal synthesis in an ethanol/acetic acid mixture for the fabrication of SnO2 with a controllable hierarchical spherical size and micro-/mesoporosity is presented. SEM, TEM and N2 adsorption/desorption investigation unveiled that the obtained SnO2 spheres exhibited a particle size in the range of 0.6–1.6 μm and a pore size of about 1.4–1.9 nm depending on the volume ratio of acetic acid to ethanol in the reaction mixture, and the spheres were constructed by nanoscale particles. Due to its micro-/mesoporous structure, the SnO2 spheres exhibited large specific surface areas over 100 m2/g. When 10 vol. % of acetic acid at 200 °C for 20 h was used for the reaction, the obtained SnO2 possessed a higher specific surface area of 145 m2/g (SnO2_10). The gas sensing property of SnO2_10 without an additional noble metal co-catalyst exhibited a large toluene sensing response (Ra/Rg) of 20.2 at 400 °C, which was about 6 times higher and acceptable selectivity compared to those of other samples. The study found that the sensing performance in the SnO2 hierarchical spheres was influenced by several factors e.g. particle morphology, pore size and specific surface area rather than only a single parameter. Therefore, a precise control of those influencing parameters may lead to the optimum sensing property. These findings are important for the further development of the micro-/mesoporous metal-based oxide as an alternative successor for toluene gas sensor material.
AB - A facile solvothermal synthesis in an ethanol/acetic acid mixture for the fabrication of SnO2 with a controllable hierarchical spherical size and micro-/mesoporosity is presented. SEM, TEM and N2 adsorption/desorption investigation unveiled that the obtained SnO2 spheres exhibited a particle size in the range of 0.6–1.6 μm and a pore size of about 1.4–1.9 nm depending on the volume ratio of acetic acid to ethanol in the reaction mixture, and the spheres were constructed by nanoscale particles. Due to its micro-/mesoporous structure, the SnO2 spheres exhibited large specific surface areas over 100 m2/g. When 10 vol. % of acetic acid at 200 °C for 20 h was used for the reaction, the obtained SnO2 possessed a higher specific surface area of 145 m2/g (SnO2_10). The gas sensing property of SnO2_10 without an additional noble metal co-catalyst exhibited a large toluene sensing response (Ra/Rg) of 20.2 at 400 °C, which was about 6 times higher and acceptable selectivity compared to those of other samples. The study found that the sensing performance in the SnO2 hierarchical spheres was influenced by several factors e.g. particle morphology, pore size and specific surface area rather than only a single parameter. Therefore, a precise control of those influencing parameters may lead to the optimum sensing property. These findings are important for the further development of the micro-/mesoporous metal-based oxide as an alternative successor for toluene gas sensor material.
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U2 - 10.1016/j.ceramint.2019.05.043
DO - 10.1016/j.ceramint.2019.05.043
M3 - Article
AN - SCOPUS:85065427032
SN - 0272-8842
VL - 45
SP - 15435
EP - 15444
JO - Ceramics International
JF - Ceramics International
IS - 12
ER -