Biodegradable Metallic Glass for Stretchable Transient Electronics

Advanced Science

Myoung‐Ryul Ok¹  Jae‐Young Bae²  Hae Won Hwang²  Jong‐Sung Lee²  Seung‐Kyun Kang²  Young‐Chang Joo²  Jeong‐Yun Sun²  Ju‐Young Kim³  Eun‐Ji Gwak³  Dong‐Ju Lee³  Gyeong‐Seok Hwang³  Sang Ho Jun⁴ 

[1] Biomaterials Research Center, Biomedical Research Division Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea;Department of Materials Science and Engineering Seoul National University Seoul 08826 Republic of Korea;Department of Materials Science and Engineering UNIST (Ulsan National Institute of Science and Technology) Ulsan 44919 Republic of Korea;Department of Oral and Maxillofacial Surgery Korea University Anam Hospital Seoul 02841 Republic of Korea;

关键词: amorphous alloys;    biodegradable materials;    metallic glass;    stretchable electronics;    transient electronics;   

DOI  :  10.1002/advs.202004029

来源: DOAJ

【 摘 要 】

Abstract 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.

【 授权许可】

Unknown