Rapid fabrication of gold microsphere arrays with stable deep-pressing anisotropic conductivity for advanced packaging
Smooth metal microspheres with uniform sizes are ideal for constructing particle-arrayed anisotropic conductive films (ACF), but synthesis is hindered by challenges in controlling anisotropic metal growth. Here, we present a positioned transient-emulsion self-assembly and laser-irradiation strategy to fabricate pure gold microsphere arrays with smooth surfaces and uniform sizes. The fabrication involves assembling gold nanoparticles into uniform colloidosomes within a pre-designed microhole array, followed by rapid transformation into well-defined microspheres through laser heating. The gold nanoparticles melt and merge in a layer-by-layer manner due to the finite skin depth of the laser, leading to a localized photothermal effect. This strategy circumvents anisotropic growth, enables tunable control of microsphere size and positioning, and is compatible with conventional lithography. Importantly, these pure gold microspheres exhibit stable conductivity under deep compression, offering promising applications in soldering micro-sized chips onto integrated circuits.
Authors
- Xingyou Tian (ORCID: https://orcid.org/0000-0002-8351-7675)
- Yi Gong (ORCID: https://orcid.org/0000-0002-3721-2678)
- Dilong Liu (ORCID: https://orcid.org/0000-0001-5860-5967)
- Yinghui Guo (ORCID: https://orcid.org/0000-0003-4143-1600)
- Fan Yang (ORCID: https://orcid.org/0000-0002-9395-5310)
- Yulong Fan
- Yue Li (ORCID: https://orcid.org/0000-0002-1202-4224)
- An Cao (ORCID: https://orcid.org/0009-0003-5398-9246)
Institutions
- Tiangong University (CN)
- Chinese Academy of Sciences (CN)
- Hefei Institutes of Physical Science (CN)
- Shenzhen Bay Laboratory (CN)
- Institute of Optics and Electronics, Chinese Academy of Sciences (CN)
- Hefei Institute of Technology Innovation (CN)
- Institute of Solid State Physics (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-10-24
- DOI
- https://doi.org/10.1038/s41467-024-53407-x
- Citations
- 9
- Primary Topic
- Nanomaterials and Printing Technologies
- Type
- article
- Field-Weighted Citation Impact
- 1.88
Funders
- City University of Hong Kong
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Hefei Institutes of Physical Science, Chinese Academy of Sciences
- National Key Research and Development Program of China
- Youth Innovation Promotion Association
- National Science Fund for Distinguished Young Scholars