Fabrication of Nano-LaCrO₃ Receptor by Polymeric Precursor Method and Its Impedancemetric NO_x Sensing Properties

Authors: Lee, Young-Sung; Cho, Hong-Chan; Takase, S.; Shimizu, Y.; Baek, Jong-Tae; Song, Jeong-Hwan

Source: Journal of Nanoscience and Nanotechnology, Volume 12, Number 2, February 2012 , pp. 1141-1146(6)

Publisher: American Scientific Publishers

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Abstract:

LaCrO₃ was prepared by using the polymeric precursor method for use as a receptor material and its NO_x sensing characteristics were investigated. Nano-LaCrO₃ powders were synthesized at the optimum compositions of the mole ratio of [La-, Cr-source]:[EG]:[AcAc] = [a, a]:[160 a]:[8 a] with 1 wt% polyvinylpyrrolidone (PVP) using ethylene glycol (EG) as a solvent, acetyl acetone (AcAc) as a chelating agent, and PVP as a polymer additive. The thermal decomposition behavior, crystal structure, morphology, and particle sizes of nano powders were characterized by a thermal analysis (TG-DTA), X-ray diffraction (XRD), a field emission scanning electron microscopy (FE-SEM), and a particle size analyzer, respectively LaCrO₃ powders were mainly orthorhombic in structure and the primary particle size was 30 nm according to the XRD results. All solid-state compact impedancemetric-type sensor devices composed of Li_1.5Al_0.5Ti_1.5(PO₄)₃ (LATP) as a transducer and a perovskite-type LaCrO₃ nano powder as a receptor, have been investigated for their ability to detect NO_x (NO and NO₂) in the range of 1∼250 ppm at 400 °C. The sensor device showed high gas sensitivities at NO gas, but relatively low gas sensitivities for NO₂ gas.

Keywords: NANO-LACRO3 RECEPTOR; LATP TRANSDUCER; IMPEDANCEMETRIC-TYPE SENSOR; NO X

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2012.4628

Publication date: 2012-02-01

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