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Biodegradable Metallic Glass for Stretchable Transient Electronics.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Biodegradable electronics offer sustainable, "green" solutions for disposable devices and minimally invasive implants.
  • Stretchable and flexible electronics are crucial for seamless integration with biological tissues.
  • Metallic glasses (MGs) present unique properties due to their amorphous structure, lacking crystalline defects.

Purpose of the Study:

  • To introduce a fully biodegradable MgZnCa metallic glass (MG) film as an intrinsically stretchable electrode material.
  • To investigate the dissolution behavior and electrical properties of the MgZnCa MG in various aqueous environments.
  • To evaluate the performance and biocompatibility of MgZnCa MG in transient electronic devices and energy harvesting applications.

Main Methods:

  • Fabrication of a biodegradable MgZnCa metallic glass (MG) nanofilm.
  • Nano-tensile testing to determine elastic strain and stretchability.
  • Investigation of dissolution behavior in aqueous solutions with different ion species.
  • Integration of MgZnCa MG electrodes into electronic components (capacitor, inductor, diode, transistor) and a triboelectric nanogenerator.
  • In vitro cell toxicity and in vivo inflammation tests.

Main Results:

  • The MgZnCa MG nanofilm exhibited high elastic strain (≈2.6%) and enhanced stretchability (≈115% with serpentine geometry).
  • The material demonstrated improved fatigue resistance due to its wide elastic strain limit.
  • Electronic components and a biodegradable triboelectric nanogenerator using MgZnCa MG electrodes functioned effectively.
  • The triboelectric nanogenerator operated stably over 50,000 cycles.
  • In vitro and in vivo tests confirmed the material's biocompatibility, showing no significant cell toxicity or inflammation.

Conclusions:

  • A biodegradable MgZnCa MG film serves as a promising intrinsically stretchable electrode for transient biointegrated electronics.
  • The developed material offers high stretchability, fatigue resistance, and biocompatibility, suitable for medical implants and energy harvesting.
  • This work advances the development of sustainable and high-performance electronic devices for biomedical applications.