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Background <p>Low-dimensional materials are crucial for next-generation electronic systems but their size-dependent mechanical properties demand precise in situ mechanical characterization. Conventional platforms such as push-to-pull (PTP) micromechanical devices are limited by high fabrication costs, poor load–displacement linearity, and restriction to uniaxial stretching.</p> Objective <p>This study aims to develop a novel and stable micro-mechanical device (MMD) device with excellent load–displacement linearity, utilizing cost-effective fabrication method, and to investigate the biaxial tensile behavior of low-dimensional materials.</p> Methods <p>We designed a MMD with a meta-structure of chiral patterns, fabricated using standard silicon wafers and wet etching, which reduces production costs and enables batch manufacturing, and did the uniaxial and biaxial tensile test.</p> Results <p>This design reduces stretching stress, enhancing stability, load–displacement linearity, and experimental repeatability. Uniaxial Scanning electron microscope (SEM) tensile tests confirmed no bulk rotation after 2000&#xa0;nm displacement, while the gap of 3 μm was shown to be compatible with in situ tensile testing, and cyclic loading experiments validated repeatability. As a proof of concept, in situ tensile testing of ZnO nanowire revealed a strain of approximately 5%. Furthermore, a biaxial tensile MMD based on the meta-structure was demonstrated, with transverse and longitudinal displacements remaining nearly identical within 3 μm.</p> Conclusion <p>This MMD provides a cost-effective solution and tailorable platform for<i> in situ</i> mechanical characterization of low-dimensional materials, with the capability of biaxial stretching.</p>

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Biaxial Micro-Mechanical Device (MMD) with Meta-Structure for In-Situ Mechanical Testing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月2日

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  • T. Zhao,
  • J. Chen,
  • X. Wang,
  • Y. Wu,
  • H. Yan,
  • P. Yip,
  • B. Li,
  • J. Zhou,
  • Y. Lu

摘要

Background

Low-dimensional materials are crucial for next-generation electronic systems but their size-dependent mechanical properties demand precise in situ mechanical characterization. Conventional platforms such as push-to-pull (PTP) micromechanical devices are limited by high fabrication costs, poor load–displacement linearity, and restriction to uniaxial stretching.

Objective

This study aims to develop a novel and stable micro-mechanical device (MMD) device with excellent load–displacement linearity, utilizing cost-effective fabrication method, and to investigate the biaxial tensile behavior of low-dimensional materials.

Methods

We designed a MMD with a meta-structure of chiral patterns, fabricated using standard silicon wafers and wet etching, which reduces production costs and enables batch manufacturing, and did the uniaxial and biaxial tensile test.

Results

This design reduces stretching stress, enhancing stability, load–displacement linearity, and experimental repeatability. Uniaxial Scanning electron microscope (SEM) tensile tests confirmed no bulk rotation after 2000 nm displacement, while the gap of 3 μm was shown to be compatible with in situ tensile testing, and cyclic loading experiments validated repeatability. As a proof of concept, in situ tensile testing of ZnO nanowire revealed a strain of approximately 5%. Furthermore, a biaxial tensile MMD based on the meta-structure was demonstrated, with transverse and longitudinal displacements remaining nearly identical within 3 μm.

Conclusion

This MMD provides a cost-effective solution and tailorable platform for in situ mechanical characterization of low-dimensional materials, with the capability of biaxial stretching.