Correlating Structural Properties with Catalytic Stability in Nanocrystalline La(Sr)CoO3 Thin Films Grown by Pulsed Electron Deposition (PED)
Lukasz Cieniek, Dominik Grochala, Tomasz Moskalewicz, Agnieszka Kopia, Kazimierz Kowalski
TL;DR
This paper explores how strontium-doped lanthanum cobaltite thin films, made using a sustainable method, can be used as stable gas sensors for detecting nitrogen dioxide at high temperatures.
Contribution
The study demonstrates that Sr-doped LaCoO3 films fabricated via PED offer enhanced gas-sensing performance and stability at high temperatures.
Findings
Sr-doping refines the microstructure, resulting in smaller crystallites and a uniform surface.
La0.8Sr0.2CoO3 shows the highest sensitivity and stability for NO2 sensing up to 350 °C.
PED proves to be an effective method for producing high-quality, complex oxide thin films.
Abstract
This study investigates the structural, morphological, and gas-sensing properties of pure and strontium-doped lanthanum cobaltite (La1−xSrxCoO3) perovskite thin films obtained by Pulsed Electron Deposition (PED). This sustainable ablative technique successfully produced high-quality, dense, nanocrystalline films on Si and MgO substrates, demonstrating excellent stoichiometric transfer from the source targets. A comprehensive analysis using XRD, SEM, TEM, AFM, and XPS was conducted to characterize the films. The results show that Sr-doping significantly refines the microstructure, leading to smaller crystallites and a more uniform surface topography. Gas sensing measurements, performed in a temperature range of 100–450 °C, revealed that all films exhibit a characteristic p-type semiconductor response to nitrogen dioxide (NO2). The La0.8Sr0.2CoO3 composition, in particular, demonstrated…
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Taxonomy
TopicsGas Sensing Nanomaterials and Sensors · Electronic and Structural Properties of Oxides · ZnO doping and properties