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<p>This study presents the design and construction of a pulse-modulated microwave atmospheric pressure plasma jet (PMPJ) system and investigates its application in surface modification of polyimide (PI) films. The stable operation window of the PMPJ was determined and the jet produced reactive oxygen species while maintaining low gas temperature at ~ 450&#xa0;K. After 30&#xa0;s treatment, the surface wettability of PI was improved (water contact angle dropped from 69.9° to 27.7°), and the peel strength with copper increased sixfold to 1.44&#xa0;N/cm. Density functional theory calculations reveal that enhanced adhesion mainly stems from improved adsorption energy endowed by introduced oxygen functional groups The study demonstrates the effectiveness of this designed PMPJ in strengthening polymer–metal interfaces for flexible electronics.</p>

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A Pulse-Modulated Microwave Atmospheric Pressure Plasma Jet and its Applications in Polymer Modifications

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Dai Zhang,
  • Daopeng Zou,
  • Ruilin Guo,
  • Yaoyao Huang,
  • Xijiang Chang,
  • Zhonghang Wu,
  • Zilan Xiong

摘要

This study presents the design and construction of a pulse-modulated microwave atmospheric pressure plasma jet (PMPJ) system and investigates its application in surface modification of polyimide (PI) films. The stable operation window of the PMPJ was determined and the jet produced reactive oxygen species while maintaining low gas temperature at ~ 450 K. After 30 s treatment, the surface wettability of PI was improved (water contact angle dropped from 69.9° to 27.7°), and the peel strength with copper increased sixfold to 1.44 N/cm. Density functional theory calculations reveal that enhanced adhesion mainly stems from improved adsorption energy endowed by introduced oxygen functional groups The study demonstrates the effectiveness of this designed PMPJ in strengthening polymer–metal interfaces for flexible electronics.