Sensitivity and long-term stability of γ-Fe2O3 and CoFe2O4 nanoparticle gas sensors for NO2, CO and acetone sensing — A comparative study

Author

Luby, S. ; Jergel, M. ; Benkovicova, M. ; Siffalovic, P. ; Ivanco, J. ; Vegso, K. ; Majkova, E. ; Rella, R. ; Manera, M.G. ; Capone, S. ; Vavra, I.

Author_Institution

Inst. of Phys. SAS, Bratislava, Slovakia

fYear

2014

fDate

20-22 Oct. 2014

Firstpage

1

Lastpage

4

Abstract

Gas sensors based on γ-Fe₂O₃ and CoFe₂O₄ nanoparticles (NPs) were prepared by Langmuir-Schaeffer deposition onto Al₂O₃ and auxilliary Si substrates. NPs with the size of 6.4 nm (Fe₂O₃) and 7.6 nm (CoFe₂O₄) and polydispersity of 9 % were fabricated by chemical route. NP arrays were analyzed by GIXRD, SEM, TEM, DLS and ellipsometry. Fe₂O₃ sensors show high response of 38 for 500 ppb of strongly oxidizing NO₂. The response of CoFe₂O₄ sensors is 10 at 5 ppm of NO₂. Sensitivities are lower with reducing CO and acetone gases. After one year storage at room temperature, a 6 % decrease of response was found. The sensor sensitivities are discussed comparing with the best published results so far.

Keywords

X-ray diffraction; carbon compounds; cobalt compounds; ellipsometry; gas sensors; iron compounds; nanofabrication; nanoparticles; nanosensors; nitrogen compounds; organic compounds; oxidation; scanning electron microscopy; transmission electron microscopy; CO; CoFe₂O₄; DLS; Fe₂O₃; GIXRD; Langmuir-Schaeffer deposition; NO₂; NP array; SEM; TEM; auxilliary Si substrate; ellipsometry; nanoparticle gas sensor; oxidization; polydispersity; size 6.4 nm; size 7.6 nm; stability; temperature 293 K to 298 K; Actuators; Current measurement; Gas detectors; Substrates; Temperature sensors; Thermal stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Semiconductor Devices & Microsystems (ASDAM), 2014 10th International Conference on

Conference_Location

Smolenice

Print_ISBN

978-1-4799-5474-2

Type

conf

DOI

10.1109/ASDAM.2014.6998691

Filename

6998691