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

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Title: Synthesis and characterization of Ni@TiO2 nanocapsules for RF-MLCC electrodes via DC arc plasma method.
Authors: Li, Xi-Yang1 (AUTHOR), Wei, Guang-Long1 (AUTHOR), Shen, Nai-Rui1 (AUTHOR), Wang, Yi-Long1 (AUTHOR), Dong, Xing-Long1 (AUTHOR) dongxl@dlut.edu.cn, Jung, Youngguan2 (AUTHOR)
Source: Materials Science & Engineering: B. Jan2025, Vol. 311, pN.PAG-N.PAG. 1p.
Subjects: Ceramic capacitors, Plasma arcs, Titanium dioxide, Nitrogen plasmas, Quality factor, Nanocapsules
Abstract: [Display omitted] • Ni@TiO 2 nanocapsules made by DC arc plasma in N 2 , forming core–shell structures. • TiO 2 coat on Ni nanoparticles raised oxidation resistance, start temp up ∼ 50 °C. • Improved sintering seen; 30 wt% TiO 2 samples reached 5.3% shrinkage rate. • Better high-frequency performance and Q value make Ni@TiO 2 nanocapsules a promising material for RF-MLCC internal electrodes. Ni@TiO 2 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@TiO 2 nanocapsules exhibit enhanced oxidation resistance, thermal stability, delayed initial sintering temperature, and controllable thermal expansion. The sample with 30 wt% TiO 2 addition shows an onset oxidation temperature of 251.9 °C and a sintering shrinkage of 5.4 % at 1200 °C. The TiO 2 shell demonstrates high compatibility with the Ni core and an excellent quality factor (Q), with the 5 wt% TiO 2 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@TiO 2 NCs under a nitrogen atmosphere, making it suitable for large-scale industrial production. Thus, Ni@TiO 2 NCs present a promising material for next-generation radio-frequency multilayer ceramic capacitors (RF-MLCCs). [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • Ni@TiO 2 nanocapsules made by DC arc plasma in N 2 , forming core–shell structures. • TiO 2 coat on Ni nanoparticles raised oxidation resistance, start temp up ∼ 50 °C. • Improved sintering seen; 30 wt% TiO 2 samples reached 5.3% shrinkage rate. • Better high-frequency performance and Q value make Ni@TiO 2 nanocapsules a promising material for RF-MLCC internal electrodes. Ni@TiO 2 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@TiO 2 nanocapsules exhibit enhanced oxidation resistance, thermal stability, delayed initial sintering temperature, and controllable thermal expansion. The sample with 30 wt% TiO 2 addition shows an onset oxidation temperature of 251.9 °C and a sintering shrinkage of 5.4 % at 1200 °C. The TiO 2 shell demonstrates high compatibility with the Ni core and an excellent quality factor (Q), with the 5 wt% TiO 2 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@TiO 2 NCs under a nitrogen atmosphere, making it suitable for large-scale industrial production. Thus, Ni@TiO 2 NCs present a promising material for next-generation radio-frequency multilayer ceramic capacitors (RF-MLCCs). [ABSTRACT FROM AUTHOR]
ISSN:09215107
DOI:10.1016/j.mseb.2024.117861