ABSTRACT Polyimide (PI) films were irradiated by 120 MeV iron (Fe+9) ions and variations in its optical, chemical, surface morphology and anti-bacterial properties were studied. UV-Visible spectroscopic results showed the decrease in the optical band gap of PI after irradiation due to the chain scission mainly at the carbonyl group which is corroborated by Fourier Transform Infrared spectroscopic results. The scanning electron microscopic results showed the surface roughening, surface structure broken and micro-porous formation in PI after irradiation. These results are also corroborated by the decrease in contact angle as studied by the contact angle measurement. PI films irradiated by 120 MeV Fe+9 ions showed increased anti-biofilm efficacy against the human pathogen, Salmonella typhi. In addition to this, the morphological changes were also observed due to the stress of Fe-irradiated PI. Biofilm formation was inhibited ≈ 35% at 1 × 1011 ion/cm2 and 80% at 5 × 1012 ion/cm2 in irradiated PI films. Thus, surface modification of PI films help in the inhibition of biofilm formation. Highlights Polyimide (PI) films were irradiated by 120 MeV Fe+9 ions. Optical band gap of PI decreased after ion irradiation. Surface roughening and micro-pores formation in PI after ion irradiation. Surface modification of PI films helps in the inhibition of bio-film formation.

中文翻译：

---

120 MeV Fe+9 SHI 辐照聚酰亚胺薄膜的抗生物膜效率

摘要 聚酰亚胺 (PI) 薄膜被 120 MeV 铁 (Fe+9) 离子辐照，并研究了其光学、化学、表面形态和抗菌性能的变化。紫外-可见光谱结果表明，由于主要在羰基上的断链，PI 的光学带隙在照射后减小，傅里叶变换红外光谱结果证实了这一点。扫描电镜结果表明，辐照后PI表面变粗糙、表面结构破裂并形成微孔。这些结果也被接触角测量所研究的接触角的减小所证实。经 120 MeV Fe+9 离子照射的 PI 膜显示出对人类病原体伤寒沙门氏菌的抗生物膜功效增加。除此之外，由于铁辐照 PI 的应力，也观察到形态变化。生物膜形成在 1 × 1011 离子/cm2 下被抑制 ≈ 35%，在 5 × 1012 离子/cm2 下抑制 80%。因此，PI 膜的表面改性有助于抑制生物膜的形成。亮点 聚酰亚胺 (PI) 薄膜被 120 MeV Fe+9 离子照射。离子照射后PI的光学带隙减小。离子照射后 PI 中的表面粗糙化和微孔形成。PI 膜的表面改性有助于抑制生物膜的形成。亮点 聚酰亚胺 (PI) 薄膜被 120 MeV Fe+9 离子照射。离子照射后PI的光学带隙减小。离子照射后 PI 中的表面粗糙化和微孔形成。PI 膜的表面改性有助于抑制生物膜的形成。亮点 聚酰亚胺 (PI) 薄膜被 120 MeV Fe+9 离子照射。离子照射后PI的光学带隙减小。离子照射后 PI 中的表面粗糙化和微孔形成。PI 膜的表面改性有助于抑制生物膜的形成。