Jo Yong-Su, Park Hye-Min, Jin Gwang-Hwa, Swain Bhabani Sankar, Min Seok-Hong, Kim Young Keun, Yang Seung-Min
Functional Materials and Components R&D Group, Korea Institute of Industrial Technology Gangneung 25440 Gangwon-do Republic of Korea.
Department of Materials Science and Engineering, Korea University Seoul 02841 Republic of Korea.
RSC Adv. 2022 Sep 29;12(43):27820-27825. doi: 10.1039/d2ra05281d. eCollection 2022 Sep 28.
Modern electronic devices, such as smartphones and electric vehicles, require multilayer ceramic capacitors (MLCCs), which comprise highly pure Cu terminations and Ni electrodes. Vapor-phase synthesis (VPS) is a promising method for synthesizing nanoparticles (NPs) with high purity and crystallinity. However, the agglomeration of the NPs occurs during their synthesis, which degrades the performance of the MLCC electrodes owing to several factors, including electrical shorts and low packing density. This paper proposes a coating-assisted VPS to inhibit agglomeration using potassium chloride (KCl) as the coating agent. The agglomeration ratio of the Cu NPs synthesized by in-flight coating with KCl at 950 °C significantly decreased from 48.20% to 3.80%, compared to without KCl coating. Furthermore, X-ray fluorescence and X-ray diffraction analyses confirmed that the KCl coating agent and residual copper chloride were removed by washing with ammonium hydroxide.
现代电子设备，如智能手机和电动汽车，需要多层陶瓷电容器（MLCC），其包含高纯度的铜终端和镍电极。气相合成（VPS）是一种用于合成具有高纯度和结晶度的纳米颗粒（NP）的有前途的方法。然而，在NP的合成过程中会发生团聚，由于包括电气短路和低堆积密度在内的几个因素，这会降低MLCC电极的性能。本文提出了一种涂层辅助VPS，以使用氯化钾（KCl）作为涂层剂来抑制团聚。与未涂覆KCl相比，在950°C下通过飞行中涂覆KCl合成的铜NP的团聚率从48.20%显著降低至3.80%。此外，X射线荧光和X射线衍射分析证实，通过用氢氧化铵洗涤可以去除KCl涂层剂和残留的氯化铜。
