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Effect of Au and Ag contacts on the CO sensitivity of SnO2 thick films

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Abstract

Synthesized tin oxide (SnO2) nanoparticles were deposited on soda lime glass substrates, in thick films form, by means of Doctor-Blade technique. Further annealing treatment were done on all films at 250, 350, and 450 °C. The deposited films were characterized using X-ray diffraction, Profilometry, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). As the annealing temperature increased, the corresponding thickness of the films varied from 1319 to 538.5 nm due to the evaporation of carbon during the annealing process. SEM analysis has confirmed the formation of agglomerates consisting of SnO2 particles with average size in the range of ~ 25–60 nm, which are highly porous. At higher annealing temperatures, an increment in surface porosity resulted in pin holes-like structures. EDS analysis has confirmed the evaporation of carbon with increase in annealing temperature and homogenous distribution of Sn and O over the film surface. The films were tested as gas sensors, by detecting the resistivity change as a function of CO concentration. Two metal contacts were tested also, namely, silver and gold, deposited on tin oxide annealed at 450 °C. An enhanced sensing response around 100 was achieved for films with gold contacts as compared with a value of 30 found in the samples with silver contacts. The high sensing response of SnO2 films with gold contacts is due to the high contact area with SnO2, gold inertness, and chemical stability. Our findings let us suggest that SnO2 sensors with gold contacts operating at 100 °C will be lower power consumption sensing devices with high durability.

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Acknowledgements

Authors are grateful to School of Electrical and Computer Engineering, RMIT University, Australia for providing the transducer with gold contacts. The technical assistance of M. A. Luna-Arias, A. Tavira-Fuentes, and Josue-Esau Romero Ibarra for sample preparation and characterization. This work was supported by PRODEP with Project No. 511-6/19-8268.

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Authors and Affiliations

  1. Undergraduate School Campus Tepeji, Industrial Engineering, Autonomous Hidalgo State University, ESTe-UAEH, Av. del Maestro No. 41, Col. Noxtongo 2ª Sección, C.P. 42855, Tepeji del Rio, Hidalgo, Mexico

    T. V. K. Karthik & A. G. Hernandez

  2. Solid State Electronics Section, Electrical Engineering Department, Center for Research and Advanced Studies form National Polytechnic Institute, CINVESTAV-IPN, Av. IPN n. 2508, Col. San Pedro Zacatenco, C.P. 07360, Mexico City, Mexico

    M. L. de la Olvera & A. Maldonado

  3. Computing and Electronics Academic Area, ICBI, Autonomous Hidalgo State University, Carretera Pachuca- Tulancingo Km. 4.5, Hidalgo, C.P. 42184, Pachuca, Mexico

    H. Gómez Pozos

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  1. T. V. K. Karthik
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  2. A. G. Hernandez
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  3. M. L. de la Olvera
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  4. A. Maldonado
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  5. H. Gómez Pozos
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Correspondence to T. V. K. Karthik.

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Karthik, T.V.K., Hernandez, A.G., de la Olvera, M.L. et al. Effect of Au and Ag contacts on the CO sensitivity of SnO2 thick films. J Mater Sci: Mater Electron 31, 7481–7489 (2020). https://doi.org/10.1007/s10854-020-02988-6

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  • DOI: https://doi.org/10.1007/s10854-020-02988-6

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