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황혜진Hye Jin Hwang
Harvard Medical School
Nat. Nanotechnol., Published 13 August 2018, 13, pages1048-1056 | https://doi.org/10.1038/s41565-018-0226-8
Highly conductive, stretchable, and biocompatible Ag-Au core-sheath nanowire composite for wearable and implantable bioelectronics
Suji Choi1,2,5, Sang Ihn Han1,2,5, Dongjun Jung1,2,5, Hye Jin Hwang3,5, Chaehong Lim1,2, Soochan Bae3, Ok Kyu Park1,2, Cory M. Tschabrunn3, Mincheol Lee1,2, Sun Youn Bae3, Ji Woong Yu2, Ji Ho Ryu2, Sang-Woo Lee4, Kyungpyo Park4, Peter M. Kang3, Won Bo Lee2, Reza Nezafat3, Taeghwan Hyeon1,2* and Dae-Hyeong Kim1,2*
1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea. 2School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea. 3Cardiovascular Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. 4Department of Physiology, School of Dentistry, Seoul National University, Seoul, Republic of Korea. 5These authors contributed equally: Suji Choi, Sang Ihn Han, Dongjun Jung, Hye Jin Hwang.
*Correspondence to Taeghwan Hyeon or Dae-Hyeong Kim
1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea. 2School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea. 3Cardiovascular Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. 4Department of Physiology, School of Dentistry, Seoul National University, Seoul, Republic of Korea. 5These authors contributed equally: Suji Choi, Sang Ihn Han, Dongjun Jung, Hye Jin Hwang.
*Correspondence to Taeghwan Hyeon or Dae-Hyeong Kim
Abstract
Wearable and implantable devices require conductive, stretchable and biocompatible materials. However, obtaining composites that simultaneously fulfil these requirements is challenging due to a trade-off between conductivity and stretchability. Here, we report on Ag-Au nanocomposites composed of ultralong gold-coated silver nanowires in an elastomeric block-copolymer matrix. Owing to the high aspect ratio and percolation network of the Ag-Au nanowires, the nanocomposites exhibit an optimized conductivity of 41,850-S-cm-1 (maximum of 72,600-S-cm-1). Phase separation in the Ag-Au nanocomposite during the solvent-drying process generates a microstructure that yields an optimized stretchability of 266% (maximum of 840%). The thick gold sheath deposited on the silver nanowire surface prevents oxidation and silver ion leaching, making the composite biocompatible and highly conductive. Using the nanocomposite, we successfully fabricate wearable and implantable soft bioelectronic devices that can be conformally integrated with human skin and swine heart for continuous electrophysiological recording, and electrical and thermal stimulation.
논문정보
- Research article
- 2018년 08월 (BRIC 등록일 2018-11-12)
- 국내(교신)+국외 연구진
- 바이오·의료융합 > 바이오센싱 및 나노바이오물질
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