Fabrication of Nano-LaCrO3 Receptor by Polymeric Precursor Method and Its Impedancemetric NOx 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
Abstract:LaCrO3 was prepared by using the polymeric precursor method for use as a receptor material and its NOx 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 Li1.5Al0.5Ti1.5(PO4)3 (LATP) as a transducer and a perovskite-type LaCrO3 nano powder as a receptor, have been investigated for their ability to detect NOx (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.
Document Type: Research article
Publication date: 2012-02-01
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