期刊
CERAMICS INTERNATIONAL
卷 46, 期 17, 页码 26682-26688出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.07.139
关键词
Conductometric sensor; Electrochemical sensor; Acetone; Dopamine; Rare earth Ferrite
资金
- Ministry of Science Research and Technology of Iran under the FRGS grant
- Malayer University of Iran
- University of Messina, Messina, Italy
In this paper, nanostructured perovskite-type LnFeO(3) (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 LnFeO(3) samples. In particular, it has been demonstrated the good gas sensing characteristics of SmFeO3 for acetone gas (Response = R/R-0= 8.3-20 ppm acetone at 200 degrees 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 LnFeO(3) samples were discussed in detail with respect to their chemical composition and microstructure.
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