Biodegradable Metallic Glass for Stretchable Transient Electronics. Issue 10 (15th March 2021)

• Record Type: Journal Article
• Authors: Bae, Jae‐Young; Gwak, Eun‐Ji; Hwang, Gyeong‐Seok; Hwang, Hae Won; Lee, Dong‐Ju; Lee, Jong‐Sung; Joo, Young‐Chang; Sun, Jeong‐Yun; Jun, Sang Ho; Ok, Myoung‐Ryul; Kim, Ju‐Young; Kang, Seung‐Kyun
• Is Part Of: Advanced science. Volume 8:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-15
• Subjects: amorphous alloys -- biodegradable materials -- metallic glass -- stretchable electronics -- transient electronics; Science -- Periodicals; 505
• DOI: 10.1002/advs.202004029
• Languages: English
• ISSNs: 2198-3844

Abstract

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. Abstract : Fully biodegradable MgZnCa metallic glass (MG) film is proposed for intrinsically stretchable electrodes with a high yield limit (≈2.6%), exploiting the advantages of amorphous phases with no crystalline defects. The top image shows the highly stretchable MgZnCa MG electrode integrating serpentine structure. Dissolution images of fatigue‐resistant triboelectric nanogenerator demonstrate the application of intrinsically stretchable MgZnCa MG in repeatable stretching mode.