中国物理B ›› 2025, Vol. 34 ›› Issue (10): 104202-104202.doi: 10.1088/1674-1056/adde36

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Effects of the buffer layer on the Casimir pressure of peptide films deposited on a substrate

Dingding Lv(吕丁丁)1, Shuai Zhou(周帅)1,3, Kaipeng Liu(柳开鹏)1, Shiwei Dai(戴士为)2, and Lixin Ge(葛力新)1,†   

  1. 1 School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China;
    2 College of Mathematics and Physics, Chengdu University of Technology, Chengdu 610059, China;
    3 Department of Basic Courses, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
  • 收稿日期:2025-03-30 修回日期:2025-05-14 接受日期:2025-05-29 发布日期:2025-09-29
  • 通讯作者: Lixin Ge E-mail:lixinge@hotmail.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11804288) and the Natural Science Foundation of Henan (Grant No. 232300420120).

Effects of the buffer layer on the Casimir pressure of peptide films deposited on a substrate

Dingding Lv(吕丁丁)1, Shuai Zhou(周帅)1,3, Kaipeng Liu(柳开鹏)1, Shiwei Dai(戴士为)2, and Lixin Ge(葛力新)1,†   

  1. 1 School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China;
    2 College of Mathematics and Physics, Chengdu University of Technology, Chengdu 610059, China;
    3 Department of Basic Courses, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
  • Received:2025-03-30 Revised:2025-05-14 Accepted:2025-05-29 Published:2025-09-29
  • Contact: Lixin Ge E-mail:lixinge@hotmail.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11804288) and the Natural Science Foundation of Henan (Grant No. 232300420120).

摘要: The Casimir pressure plays an important role in the adhesion stability of nanofilms at submicro scales. In this work, the Casimir pressure of peptide films deposited on a layered substrate is investigated. Three types of semi-infinite substrates, i.e., silica, silicon and gold, are considered. The buffer layer between the peptide film and substrate consists of silicon or silica. The switching sign of the Casimir pressure can be controlled in a region ranging from about 130 nm to 1000 nm, depending on the thickness of the buffer layer and the substrate. The results suggest that the critical thickness of peptide films for Casimir equilibrium increases (or decreases) by increasing the thickness of the silicon (or silica) buffer film. The influences of wetting and electrolyte screening on the Casimir pressure are also investigated. Our finding provides a theoretical guide for the adhesion stability of peptide films in organic electronics.

关键词: Casimir pressure, buffer layer, peptide films, electrolyte screening

Abstract: The Casimir pressure plays an important role in the adhesion stability of nanofilms at submicro scales. In this work, the Casimir pressure of peptide films deposited on a layered substrate is investigated. Three types of semi-infinite substrates, i.e., silica, silicon and gold, are considered. The buffer layer between the peptide film and substrate consists of silicon or silica. The switching sign of the Casimir pressure can be controlled in a region ranging from about 130 nm to 1000 nm, depending on the thickness of the buffer layer and the substrate. The results suggest that the critical thickness of peptide films for Casimir equilibrium increases (or decreases) by increasing the thickness of the silicon (or silica) buffer film. The influences of wetting and electrolyte screening on the Casimir pressure are also investigated. Our finding provides a theoretical guide for the adhesion stability of peptide films in organic electronics.

Key words: Casimir pressure, buffer layer, peptide films, electrolyte screening

中图分类号:  (Quantum fluctuations, quantum noise, and quantum jumps)

  • 42.50.Lc
87.14.ef (Peptides) 61.20.Qg (Structure of associated liquids: electrolytes, molten salts, etc.)