Journal
E-POLYMERS
Volume 22, Issue 1, Pages 577-584Publisher
DE GRUYTER POLAND SP Z O O
DOI: 10.1515/epoly-2022-0054
Keywords
PI; CQDs; composites; dielectric properties; mechanical properties
Categories
Funding
- Natural Science Foundation of China [52173006, 21975111]
- Jiangxi Provincial Natural Science Foundation [20202BABL213007, 20212BAB203013]
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Polyimide (PI) is commonly used in microelectronics due to its excellent properties. To meet the low dielectric loss requirement, PI/carbon quantum dots (PI/CQDs) composite films were developed. The introduction of CQDs significantly reduced the dielectric loss while maintaining the mechanical and thermal properties of the film.
Polyimide (PI) is widely used in the field of microelectronics because of its excellent thermal, mechanical, optical, and electrical properties. With the development of electronics and information industry, PI as a dielectric material needs to possess low dielectric loss. PI/carbon quantum dots (PI/CQDs) composite films with low dielectric loss were prepared by introducing CQDs into PI matrix. At 25 degrees C and 1 kHz voltage, the dielectric loss of pure PI film is about 0.0057. The dielectric loss of PI/CQDs composite film is about 0.0018, which is about 68% lower than that of pure PI film. The dielectric loss of PI/CQD composite film is greatly reduced while the mechanical properties and thermal properties of PI/CQDs composite film roughly remain unchanged. Due to the cross-linking structure formed between CQDs and PI molecular chain, the relative movement of PI molecular chain is hindered.
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