Impact of varying magnetite nanoparticle concentrations on the structural, electrical, and magnetic properties of polyaniline-based magnetic nanocomposites

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2024-07-24 DOI:10.1016/j.synthmet.2024.117703

Daina Dayana Arenas Buelvas , Luan Pereira Camargo , Daniel Farinha Valezi , Lilian Felipe Silva Tupan , Luiz Henrique Dall’Antonia , Christian Manuel Moreno Rocha , Daniel Andres Sanchez Lopez , Alexandre Urbano , Bruno Luiz Santana Vicentin

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Abstract

We report the synthesis of polyaniline/magnetite nanocomposites (PMNCs) via in situ chemical oxidation polymerization of aniline with magnetite nanoparticles (MNPs) at 5, 12, and 25 wt%. The objective was to evaluate how the MNPs’ proportion affects the electrical, magnetic, and structural properties, which were investigated using XRD, EDXRF, TEM, EIS, ESR spectroscopy, Mössbauer spectroscopy, and VSM. EDXRF confirmed the formation of MNPs, while XRD revealed the crystalline nature of MNPs and the semicrystalline structure of PANI, with a decrease crystallinity index as the MNPs percentage increased. TEM showed PANI encapsulating MNPs with average diameters of 9.7 ± 2, 9.9 ± 2, and 13.1 ± 3 nm for PMNC25, PMNC12, and PMNC5, respectively. Conductivity values of PANI, PMNC25, PMNC12 and PMNC5 were 7.96 ×10⁻⁴, 1.38 ×10⁻⁴, 2.19 ×10⁻⁴ and 2.31 ×10⁻⁴ S/cm, respectively. ESR indicated cationic radicals responsible for conductivity. Saturation magnetization (Ms) for MNPs, PMNC25, PMNC12 and PMNC5 were 93.4, 24.6, 11.8 and 5.6 emu/g, respectively, with superparamagnetic behavior observed. Our findings show that incorporating MNPs into the PANI matrix modulates electrical conductivity and magnetic properties while maintaining the nanocomposite’s structure, highlighting the multifunctional potential of these composites.

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不同磁铁矿纳米粒子浓度对聚苯胺基磁性纳米复合材料的结构、电学和磁学特性的影响

我们报告了通过苯胺与磁铁矿纳米颗粒（MNPs）的化学氧化聚合合成聚苯胺/磁铁矿纳米复合材料（PMNCs）的情况，MNPs 的含量分别为 5、12 和 25wt%。研究的目的是评估 MNPs 的比例如何影响电学、磁学和结构特性，并使用 XRD、EDXRF、TEM、EIS、ESR 光谱、莫斯鲍尔光谱和 VSM 对这些特性进行了研究。EDXRF 证实了 MNPs 的形成，而 XRD 则揭示了 MNPs 的晶体性质和 PANI 的半晶体结构，随着 MNPs 百分比的增加，结晶度指数也在下降。TEM 显示，PANI 封装的 MNPs 平均直径分别为 9.7 ± 2、9.9 ± 2 和 13.1 ± 3nm （PMNC25、PMNC12 和 PMNC5）。PANI、PMNC25、PMNC12 和 PMNC5 的电导率值分别为 7.96 ×10-⁴、1.38 ×10-⁴、2.19 ×10-⁴和 2.31 ×10-⁴ S/cm。ESR 表明阳离子自由基对导电性起作用。MNPs、PMNC25、PMNC12 和 PMNC5 的饱和磁化率（Ms）分别为 93.4、24.6、11.8 和 5.6emu/g，具有超顺磁性。我们的研究结果表明，在 PANI 基体中加入 MNPs 可调节导电性和磁性，同时保持纳米复合材料的结构，这凸显了这些复合材料的多功能潜力。

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.