Cost-Effective Fabrication of Silica-Silver Microspheres with Enhanced Conductivity for Electromagnetic Interference Shielding.

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanomaterials Pub Date : 2025-09-18 DOI:10.3390/nano15181433

Mingzheng Hao, Zhonghua Huang, Wencai Wang, Zhaoxia Lv, Tao Zhang, Wenjin Liang, Yurong Liang

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引用次数: 0

Abstract

A green and cost-effective method was employed to efficiently synthesize conductive silica-silver (SiO₂/PCPA/Ag) core-shell structured microspheres. The SiO₂ microspheres were initially functionalized with poly(catechol-polyamine), followed by the in situ reduction of Ag ions to Ag nanoparticles on the surface of the SiO₂ microspheres using an electroless plating process. Analysis using scanning electron microscopy confirmed the successful formation of a dense and uniform silver layer on the surface of the SiO₂ microspheres. The valence state of the silver present on the surface of the SiO₂ microspheres was determined to be zero through analyses conducted using an X-ray photoelectron spectrometer and X-ray diffractometer. Consequently, the SiO₂/PCPA/Ag microspheres, upon initial preparation, demonstrated a notable conductivity of 1005 S/cm, which was further enhanced to 1612 S/cm following additional heat treatment aimed at rectifying defects within the silver layer. The resulting rubber composites displayed a low electrical resistivity of 5.4 × 10^-3 Ω·cm and exhibited a significant electromagnetic interference (EMI) shielding effectiveness exceeding 100 dB against both X-band and Ku-band frequencies, suggesting promising potential for utilization as a material for conducting and EMI shielding purposes.

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具有增强电导率的硅银微球的经济高效制备及其电磁干扰屏蔽。

采用一种绿色经济的方法高效合成导电硅银（SiO2/PCPA/Ag）核壳结构微球。首先用聚儿茶酚-多胺对SiO2微球进行功能化，然后利用化学镀工艺在SiO2微球表面将银离子原位还原为银纳米颗粒。扫描电镜分析证实，在SiO2微球表面成功形成了致密均匀的银层。通过x射线光电子能谱仪和x射线衍射仪的分析，确定了SiO2微球表面银的价态为零。因此，SiO2/PCPA/Ag微球在初始制备时表现出1005 S/cm的显著电导率，经过旨在纠正银层内缺陷的额外热处理后，电导率进一步提高到1612 S/cm。所得橡胶复合材料的电阻率为5.4 × 10-3 Ω·cm，对x波段和ku波段的电磁干扰屏蔽效果均超过100 dB，具有良好的导电和电磁干扰屏蔽性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.