Reducing the particle size of ceria nanostrutures could provide an efficient approach to improve gas sensing properties thereof. Here, we synthesized small CeO 2 nanoparticles (3–5 nm) in the support of [EMIM][Tf 2 N] ionic liquid. The obtained CeO 2 nanoparticles showed relatively large surface areas (68.29 m 3 /g) and especially high content of Ce 3+ ions (13.5%), which increase the chemisorption of reagents and oxygen leading on enhancing gas sensing performance. Namely, at the optimal operating temperature of 400 °C, the gas response of synthesized CeO 2 sensor to 100 ppm of ethanol was 2.3, which was 1.83 times higher than that of commercial one (1.26). The superior gas sensing mechanism of synthesized CeO 2 was also discussed on the basis of the electrical resistance change. The present work could provide novel pathway to synthesize ceria and related materials, which would be possibly expected to be potential candidates for gas sensing, by the use of ionic liquid hereafter.
Bibliographical noteFunding Information:
This work was supported by (1) BK21 plus program from the Ministry of Education and Human Resource Development , (2) National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (BRL No. 2015042417 , 2016R1A2B4014090 , 2017R1A2B3006141 ), (3) Business for Academic-industrial Cooperative establishments funded by Korea Small and Medium Business Administration in 2016 (Grant No. C0396231 ).
© 2019 Elsevier B.V.
- Gas sensor
- Ionic liquid
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics