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<p>In this study, metal nitrates were used as precursors and citric acid as a chelating and combustion agent to synthesize lithium-substituted zinc ferrite Li<sub>x</sub>Zn<sub>1−x</sub>Fe<sub>2</sub>O<sub>4</sub> (0.00 ≤ x ≤ 0.12) for gas sensing applications that aim to detect small traces of NH<sub>3</sub> molecules. The effects of Li-doping on the structural and morphological properties of Li<sub>x</sub>Zn<sub>1−x</sub>Fe<sub>2</sub>O<sub>4</sub> nano-ferrite were investigated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). XRD findings indicated that the synthesized samples formed a pure phase with crystallite sizes ranging from ∼17–28 nm. The preparation process produced spherical particles with high porosity, as confirmed by FESEM images. The grain size of the samples was calculated using the Image J software. The gas response of ZnFe<sub>2</sub>O<sub>4</sub> nano-ferrite with different Li doping at different operating temperatures and a constant NH<sub>3</sub> gas concentration was studied. Sensing measurements revealed that Li doping increases the ZnFe<sub>2</sub>O<sub>4</sub>-based sensor’s response to NH<sub>3</sub> gas. At 200°C, the 0.12 Li–ZnFe<sub>2</sub>O<sub>4</sub> nano-ferrite showed the highest sensitivity. Li<sub>x</sub>Zn<sub>1−x</sub>Fe<sub>2</sub>O<sub>4</sub> is a promising candidate to fabricate an ammonia sensor with high performance.</p>

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Fabrication of NH3 gas sensors using lithium-substituted ZnFe2O4 nano-ferrite

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Hussein I Mahdi,
  • Anaam W Watan,
  • Tagreed M Al-Saadi

摘要

In this study, metal nitrates were used as precursors and citric acid as a chelating and combustion agent to synthesize lithium-substituted zinc ferrite LixZn1−xFe2O4 (0.00 ≤ x ≤ 0.12) for gas sensing applications that aim to detect small traces of NH3 molecules. The effects of Li-doping on the structural and morphological properties of LixZn1−xFe2O4 nano-ferrite were investigated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). XRD findings indicated that the synthesized samples formed a pure phase with crystallite sizes ranging from ∼17–28 nm. The preparation process produced spherical particles with high porosity, as confirmed by FESEM images. The grain size of the samples was calculated using the Image J software. The gas response of ZnFe2O4 nano-ferrite with different Li doping at different operating temperatures and a constant NH3 gas concentration was studied. Sensing measurements revealed that Li doping increases the ZnFe2O4-based sensor’s response to NH3 gas. At 200°C, the 0.12 Li–ZnFe2O4 nano-ferrite showed the highest sensitivity. LixZn1−xFe2O4 is a promising candidate to fabricate an ammonia sensor with high performance.