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<p>Developing bio-based flexible films with outstanding mechanical properties and optical performance remains a challenge, especially achieving these characteristics on a natural material through a simple and efficient process. Here, a purely mechanical strategy was developed for the first time to process bamboo at the subcellular scale. The compound middle lamella of cells was selectively destroyed, preserving the intact cell and thereby controlling the number of cell layers. Consequently, the obtained natural bamboo films were ultra-thin, with a minimal thickness of just one cell layer (10&#xa0;μm). Optical transmittance exhibited an increase as the number of cell layers decreased, reaching 70% at one cell layer. The obtained ultra-thin film, owing to the inherited fiber cell structure from bamboo, demonstrated excellent flexibility, easily achieving a 180° bend with a remarkably small radius of curvature of 1&#xa0;mm. Additionally, the film showed mechanical robustness with a Young’s modulus of 53 GPa and tensile strength of 823&#xa0;MPa. Given this high performance and the natural degradability, bamboo film emerges as a compelling candidate for applications in flexible electronics and humidity sensors. This study unveils a novel perspective on simple manufacturing of both high-performance flexible electronics and humidity monitors by harnessing the inherent characteristics of natural materials, providing cost-effective and biodegradable alternatives to plastic.</p>

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Subcellular mechanical processing of bamboo into a flexible and strong film

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • Qi Chen,
  • Changhua Fang,
  • Shanshan Jia

摘要

Developing bio-based flexible films with outstanding mechanical properties and optical performance remains a challenge, especially achieving these characteristics on a natural material through a simple and efficient process. Here, a purely mechanical strategy was developed for the first time to process bamboo at the subcellular scale. The compound middle lamella of cells was selectively destroyed, preserving the intact cell and thereby controlling the number of cell layers. Consequently, the obtained natural bamboo films were ultra-thin, with a minimal thickness of just one cell layer (10 μm). Optical transmittance exhibited an increase as the number of cell layers decreased, reaching 70% at one cell layer. The obtained ultra-thin film, owing to the inherited fiber cell structure from bamboo, demonstrated excellent flexibility, easily achieving a 180° bend with a remarkably small radius of curvature of 1 mm. Additionally, the film showed mechanical robustness with a Young’s modulus of 53 GPa and tensile strength of 823 MPa. Given this high performance and the natural degradability, bamboo film emerges as a compelling candidate for applications in flexible electronics and humidity sensors. This study unveils a novel perspective on simple manufacturing of both high-performance flexible electronics and humidity monitors by harnessing the inherent characteristics of natural materials, providing cost-effective and biodegradable alternatives to plastic.