NDLI: Investigation of Ca substitution on the gas sensing potential of $LaFeO_{3}$ nanoparticles towards low concentration $SO

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kaushik, S. D. Viegas, Alison E. Narayana, Chandrabhas Palimar, Sowmya Sundaram, Nalini G. Swain, Diptikanta Siruguri, V.
Description	Author Affiliation: Palimar S ( Materials Science Division, Poornaprajna Institute of Scientific Research, Bengaluru, India. nalini@poornaprajna.org.)
Abstract	The present work investigates the superior ability of $LaFeO_{3}$ (LaFeO) and $La_{0.8}Ca_{0.2}FeO_{2.95}$ (LaCaFeO) nanoparticles to detect 3 ppm $SO_{2}$ gas. The influence of calcium substitution on the sensing behaviour of LaFeO has been studied. High resolution TEM images show that the particle sizes of LaFeO and LaCaFeO are less than 100 nm and SEM images show the agglomeration of interconnected nanoparticles. Both LaFeO and LaCaFeO crystallize in the orthorhombic crystal system with the space group Pbnm. Rietveld analysis of neutron diffraction data showed that LaCaFeO has lattice oxygen vacancies. In addition, magnetic refinements on both the samples have been carried out. The presence of lattice oxygen vacancies in LaCaFeO is qualitatively supported by Raman and XPS measurements. Electrical characterization showed increased conductivity for the LaCaFeO sample, influencing their sensing performance significantly. The LaCaFeO nanoparticles exhibit higher sensitivity, faster response time, rapid recovery time and good recyclability for sensing 3 ppm $SO_{2}$ gas. This enhanced sensing behaviour is attributed to the increased oxygen vacancies in the lattice as well as the surface. As a consequence, increased active sites are created in LaCaFeO, promoting redox reaction between the analyte and the sensing material. The results demonstrated that while LaFeO is a good gas sensor, p-type substitution by $Ca^{2+}$ renders this material an improved resistivity based gas sensor to detect low concentration $SO_{2}.$
ISSN	14779226
Issue Number	34
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-09-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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