Open AccessBiodegradable Metallic Glass for Stretchable Transient Electronics
Author(s) -
Bae JaeYoung,
Gwak EunJi,
Hwang GyeongSeok,
Hwang Hae Won,
Lee DongJu,
Lee JongSung,
Joo YoungChang,
Sun JeongYun,
Jun Sang Ho,
Ok MyoungRyul,
Kim JuYoung,
Kang SeungKyun
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202004029
Subject(s) - materials science , biocompatibility , stretchable electronics , electronics , flexible electronics , composite material , nanotechnology , amorphous solid , electrode , optoelectronics , metallurgy , electrical engineering , chemistry , organic chemistry , engineering
Biodegradable electronics are disposable green devices whose constituents decompose into harmless byproducts, leaving no residual waste and minimally invasive medical implants requiring no removal surgery. Stretchable and flexible form factors are essential in biointegrated electronic applications for conformal integration with soft and expandable skins, tissues, and organs. Here a fully biodegradable MgZnCa metallic glass (MG) film is proposed for intrinsically stretchable electrodes with a high yield limit exploiting the advantages of amorphous phases with no crystalline defects. The irregular dissolution behavior of this amorphous alloy regarding electrical conductivity and morphology is investigated in aqueous solutions with different ion species. The MgZnCa MG nanofilm shows high elastic strain (≈2.6% in the nano‐tensile test) and offers enhanced stretchability (≈115% when combined with serpentine geometry). The fatigue resistance in repeatable stretching also improves owing to the wide range of the elastic strain limit. Electronic components including the capacitor, inductor, diode, and transistor using the MgZnCa MG electrode support its integrability to transient electronic devices. The biodegradable triboelectric nanogenerator of MgZnCa MG operates stably over 50 000 cycles and its fatigue resistant applications in mechanical energy harvesting are verified. In vitro cell toxicity and in vivo inflammation tests demonstrate the biocompatibility in biointegrated use.