In this paper, nanostructured perovskite-type LnFeO3 (Ln = Nd, Sm) oxides were synthesized by thermal treatment method (TTM). Characterization analysis conducted by X-ray diffraction (XRD), scanning electron microscopy (SEM) and micro-Raman spectroscopy, have confirmed the perovskite structure of the synthesized nanomaterials. To study the effects of Nd and Sm lanthanides substitution at the A-site on the chemical sensing performance, conductometric and electrochemical sensors based on the synthesized LnFeO3 samples were fabricated. LnFeO3-based conductometric and electrochemical sensors were tested for acetone and dopamine sensing, respectively. The data revealed that Nd and Sm in the A-position lead to a significant influence in the gas sensing and electrochemical properties of perovskite LnFeO3 samples. In particular, it has been demonstrated the good gas sensing characteristics of SmFeO3 for acetone gas (Response = R/R0 = 8.3–20 ppm acetone at 200 °C), whereas NdFeO3 displayed better performance as electrode for the electrochemical detection of dopamine reaching a low detection limit (LOD) of 270 nM at S/N = 3. The electrical and electrochemical characteristics of the perovskite LnFeO3 samples were discussed in detail with respect to their chemical composition and microstructure.
Gas sensing and electrochemical properties of rare earthferrite, LnFeO 3 (Ln = Nd, Sm)
Neri G.
2020-01-01
Abstract
In this paper, nanostructured perovskite-type LnFeO3 (Ln = Nd, Sm) oxides were synthesized by thermal treatment method (TTM). Characterization analysis conducted by X-ray diffraction (XRD), scanning electron microscopy (SEM) and micro-Raman spectroscopy, have confirmed the perovskite structure of the synthesized nanomaterials. To study the effects of Nd and Sm lanthanides substitution at the A-site on the chemical sensing performance, conductometric and electrochemical sensors based on the synthesized LnFeO3 samples were fabricated. LnFeO3-based conductometric and electrochemical sensors were tested for acetone and dopamine sensing, respectively. The data revealed that Nd and Sm in the A-position lead to a significant influence in the gas sensing and electrochemical properties of perovskite LnFeO3 samples. In particular, it has been demonstrated the good gas sensing characteristics of SmFeO3 for acetone gas (Response = R/R0 = 8.3–20 ppm acetone at 200 °C), whereas NdFeO3 displayed better performance as electrode for the electrochemical detection of dopamine reaching a low detection limit (LOD) of 270 nM at S/N = 3. The electrical and electrochemical characteristics of the perovskite LnFeO3 samples were discussed in detail with respect to their chemical composition and microstructure.Pubblicazioni consigliate
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