

FOLLOWUS
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
yudings@mail.sysu.edu.cn (D.S.Y.)
cescxd@mail.sysu.edu.cn (X.D.C.)
Received:29 January 2022,
Revised:2022-3-4,
Accepted:25 April 2022,
Online First:21 July 2022,
Published:01 October 2022
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Zhong, S. L.; Zhou, B. Y.; Gu, X. R.; Yu, D. S.; Chen, X. D. Palladium-assisted metal patterning on polyimide surfaces. Chinese J. Polym. Sci. 2022, 40, 1287–1296
Shi-Long Zhong, Bai-Yang Zhou, Xi-Rui Gu, et al. Palladium-assisted Metal Patterning on Polyimide Surfaces[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1287-1296.
Zhong, S. L.; Zhou, B. Y.; Gu, X. R.; Yu, D. S.; Chen, X. D. Palladium-assisted metal patterning on polyimide surfaces. Chinese J. Polym. Sci. 2022, 40, 1287–1296 DOI: 10.1007/s10118-022-2778-1.
Shi-Long Zhong, Bai-Yang Zhou, Xi-Rui Gu, et al. Palladium-assisted Metal Patterning on Polyimide Surfaces[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1287-1296. DOI: 10.1007/s10118-022-2778-1.
Based on the coordination affinity of nitrogen to palladium
the palladium-assisted metal patterning on polyimide films was achieved by the electroless plating. The Cu patterns on the films have a minimum line width of 50 µm
minimum line spacing of 20 µm
and low resistivity of 1.78 µΩ·cm.
A novel method of patterning high precision copper conductive micropatterns on flexible polymer substrate (polyimide) is developed. We utilized the coordination effect between palladium salts and pyridine structures to fix the palladium chloride (PdCl
2
) on the surface of polymer film while the 2
6-dimethylpyridine structures formed in the specific areas under ultraviolet light guaranteed the resolution of final patterns. Simultaneous thermal reduction of PdCl
2
on the surface can be achieved in the process of thermal cyclization of the polymer substrate. As a consequence
the obtained polyimide (PI) film can be patterned with conductive copper micropatterns directly by electroless plating. In particular
we accomplished the deposition of high precision copper pattern with a minimum line width of 50 µm and minimum line spacing of 20 µm on PI thin films (thickness ~10 μm) by electroless plating. The prepared conductive copper micropatterns exhibit a low resistivity of 1.78 µΩ·cm the same as the pure block copper. And the relationship between the structures of the polymer chains and the physical properties of polymer substrates
such as the dimensional stability
mechanical and dielectric properties were also discussed in detail. This simple and novel method of patterning metal on the polymer surface does not need to achieve the catalytic metal adhesion required for electroless plating at the cost of destroying the substrate surface and avoiding the introduction of unstable interlayers. This patterning method is compatible with the current roll-to-roll production process and can be used to develop high-performance micro-integrated circuits.
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