Adaptive Self‐Organization of Nanomaterials Enables Strain‐Insensitive Resistance of Stretchable Metallic Nanocomposites. Issue 23 (6th May 2022)

• Record Type: Journal Article
• Authors: Jung, Dongjun; Lim, Chaehong; Park, Chansul; Kim, Yeongjun; Kim, Minseong; Lee, Seunghwan; Lee, Hyunjin; Kim, Jeong Hyun; Hyeon, Taeghwan; Kim, Dae‐Hyeong
• Is Part Of: Advanced materials. Volume 34:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-06
• Subjects: metallic nanocomposites -- self‐organization of nanomaterials -- skin electronics -- strain‐insensitive resistance -- stretchable conductors; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202200980
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Highly conductive and stretchable nanocomposites are promising material candidates for skin electronics. However, the resistance of stretchable metallic nanocomposites highly depends on external strains, often deteriorating the performance of fabricated electronic devices. Here, a material strategy for the highly conductive and stretchable nanocomposites comprising metal nanomaterials of various dimensions and a viscoelastic block‐copolymer matrix is presented. The resistance of the nanocomposites can be well retained under skin deformations (<50% strain). It is demonstrated that silver nanomaterials can self‐organize inside the viscoelastic media in response to external strain when their surface is conjugated with 1‐decanethiol. Distinct self‐organization behaviors associated with nanomaterial dimensions and strain conditions are found. Adopting the optimum composition of 0D/1D/2D silver nanomaterials can render the resistance of the nanocomposites insensitive to uniaxial or biaxial strains. As a result, the resistance can be maintained with a variance of < 1% during 1000 stretching cycles under uniaxial and biaxial strains of <50% while a high conductivity of ≈31 000 S cm −1 is achieved. Abstract : A material strategy to fabricate a stretchable metallic nanocomposite with strain‐insensitive resistance is proposed. When the surface of silver nanomaterials is treated with 1‐decanethiol, the nanomaterials self‐organize in response to external strain. Adopting the optimum composition of 0D/1D/2D silver nanomaterials enables preservation of the percolation networks, resulting in strain‐insensitive resistance of the nanocompsite.