Synthesis and characterization of Ni@TiO2 nanocapsules for RF-MLCC electrodes via DC arc plasma method

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2024-11-20 DOI:10.1016/j.mseb.2024.117861

Xi-Yang Li , Guang-Long Wei , Nai-Rui Shen , Yi-Long Wang , Xing-Long Dong , Youngguan Jung

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Abstract

Ni@TiO₂ core–shell nanocapsules (NCs) were synthesized in-situ using a DC arc plasma in a nitrogen atmosphere. Compared to bare Ni nanoparticles, the coated Ni@TiO₂ nanocapsules exhibit enhanced oxidation resistance, thermal stability, delayed initial sintering temperature, and controllable thermal expansion. The sample with 30 wt% TiO₂ addition shows an onset oxidation temperature of 251.9 °C and a sintering shrinkage of 5.4 % at 1200 °C. The TiO₂ shell demonstrates high compatibility with the Ni core and an excellent quality factor (Q), with the 5 wt% TiO₂ addition sample achieving a maximum Q value of 16.5 at 12.3 GHz. Additionally, the DC arc method enables the in-situ preparation of Ni@TiO₂ NCs under a nitrogen atmosphere, making it suitable for large-scale industrial production. Thus, Ni@TiO₂ NCs present a promising material for next-generation radio-frequency multilayer ceramic capacitors (RF-MLCCs).

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通过直流电弧等离子体法合成 RF-MLCC 电极用 Ni@TiO2 纳米胶囊并确定其特性

在氮气环境中使用直流电弧等离子体原位合成了 Ni@TiO2 核壳纳米胶囊（NCs）。与裸镍纳米颗粒相比，涂覆的 Ni@TiO2 纳米胶囊具有更强的抗氧化性、热稳定性、延迟初始烧结温度和可控热膨胀性。添加了 30 wt% TiO2 的样品的起始氧化温度为 251.9 °C，1200 °C 时的烧结收缩率为 5.4%。二氧化钛外壳与镍芯具有很高的兼容性和出色的品质因数（Q），添加 5 wt% 二氧化钛的样品在 12.3 GHz 频率下的最大 Q 值为 16.5。此外，直流电弧法可在氮气环境下原位制备 Ni@TiO2 NCs，适合大规模工业生产。因此，Ni@TiO2 NCs 是下一代射频多层陶瓷电容器（RF-MLCCs）的理想材料。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.