Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 240, Issue -, Pages 1049-1057Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.09.098
Keywords
Trimethylamine; Au nanoparticles; Cr2O3; Yolk-shell spheres; Gas sensor
Funding
- National Research Foundation of Korea (NRF)
- Korean government (Ministry of Education, Science, and Technology (MEST) [2016R1A2A1A05005331]
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An ultrasensitive and selective trimethylamine (TMA) sensor was fabricated by the urea-assisted uniform loading of Au nanoparticles (similar to 5nm) on Cr2O3 yolk-shell spheres prepared by ultrasonic spray pyrolysis. The response (resistance ratio) of the Cr2O3 yolk-shell spheres uniformly loaded with fine Au nanoparticles to 5 ppm TMA was 200.9 at 225 degrees C, which was significantly higher than those of pure Cr2O3 yolk-shell spheres (24.6) and Cr2O3 yolk-shell spheres loaded with heavily agglomerated Au particles (9.2). The detection limit of Cr2O3 yolk-shell spheres uniformly loaded with Au nanoparticles was as low as 4.3 ppb. The unprecedentedly high TMA response is explained and discussed in relation to the gas-accessible morphology of the yolk-shell spheres, and the catalytic and electronic promotion of the gas sensing reaction by both Cr2O3 and well-dispersed Au nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.
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