Preparation of Dense Platinum-Yttria Stabilized Zirconia and Yttria Stabilized Zirconia Films on Porous La0.9Sr0.1MnO3 (LSM) Substrates

• Published in: Journal of the American Ceramic Society 2001-02, Vol.84 (2), p.283-88
• Main Authors: Peng, Zuoyan, Liu, Meilin
• Format: Article
• Language: English
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Electrodeposition, electroplating; Exact sciences and technology; Materials science; Metals. Metallurgy; Methods of deposition of films and coatings; film growth and epitaxy; Physics; substrates; yttria stabilized; zirconia
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.2001.tb00651.x

A sol–gel process has been developed to prepare fine powder of La0.9Sr0.1MnO3 (LSM) with an average particle size ∼40 nm. The LSM powder is pressed to pellets, on which a uniform green yttria‐stabilized zirconia (YSZ) film is deposited using an electrophoretic deposition process. A green composite film of platinum and YSZ (Pt‐YSZ) is prepared on the top of the green YSZ film using a colloidal process, followed by filling the pores using a sol–gel process. The three‐layered structure, a green Pt‐YSZ film, and a green YSZ film on a green LSM substrate, is fired at 1250°C for 3 h, resulting in a dense Pt‐YSZ and YSZ film supported by a porous LSM substrate. Electrical measurements show that the sensors with the three‐layered structure display a well‐defined diffusion‐limited current in gases containing partial pressure of oxygen up to ∼9 vol%, implying that the quality of the Pt‐YSZ and YSZ film is adequate for the sensor application.