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The influence of nickel ions substitutes in barium stannates used as humidity capacitive sensors

C. DOROFTEI1,* , P. D. POPA2, F. IACOMI1

Affiliation

  1. “Al. I. Cuza” University, Faculty of Physics, 11 Carol I Blvd, 7000506 Iasi, Romania
  2. Institute of Technical Physics, Bd. D. Mangeron 47, 700050 Iasi, Romania

Abstract

Barium stannate based perovskites with a submicron granular structure and humidity sensing capacitive were studied. These compounds can be used for sensors in humidity control in the domain of 11% RH - 98% RH. The study was concentrated on BaSnO3 ceramic material and the effect of nickel ions on the microstructure and on the electrical capacity sensitivity to humidity was investigated. With the view to obtain a porous and finer structure, thus providing a high specific surface, these materials were obtained through the precursor method of self-combustion (co-precipitation in a colloidal environment and self-combustion) followed by heat treatments. All the studied samples (Ba1-xNixSnO3, where x = 0; 0.1; 0.2; 0.5) show a significant sensitivity to humidity within 11% RH and 98% RH. The sample with the substitution x = 0.5 is characterized by a very fine structure (~250 nm) and a high effective porosity (47%). For this material, the capacity logarithmically increases by over 20 times at 100 Hz. As compared to the other samples, this sample presents a shorter response time, high sensitivity and linearity of the logarithmic sensitivity characteristic..

Keywords

Perovskite, Self-combustion, Microstructure, Humidity capacitive sensor.

Submitted at: Sept. 25, 2012
Accepted at: Feb. 20, 2013

Citation

C. DOROFTEI, P. D. POPA, F. IACOMI, The influence of nickel ions substitutes in barium stannates used as humidity capacitive sensors, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 1-2, pp. 50-53 (2013)