title: Remarkable Conductive Anisotropy of Metallic Microcoil/PDMS Composites Made by Electric Field Induced Alignment.
abstract: We successfully fabricated a highly anisotropic electrical conductive microcoil/polydimethylsiloxane (PDMS) composite based on helical Spirulina-templated metallic particles using an electric field-induced alignment method. The optimized AC electric field (2 kV/cm, 1 kHz) could efficiently assemble the lightweight conductive microcoils into continuous long chains and form unique end-to-end physical contacts between adjacent particles in the alignment direction, leading to highly conductive channels. Furthermore, the electrical conductivity in the alignment direction reached up to ∼10 S/m for 1 wt % loading and exhibited almost 7-8 orders of magnitude higher than that in perpendicular directions, which is by far the most remarkable conductive anisotropy for anisotropic conductive composites (ACCs). In addition, the anisotropic composites exhibit excellent current-carrying capability in a functional light emitting diode (LED) circuit. Therefore, due to the superior conductive anisotropy and high conductivity, the composites have promising potential in high reliability electrical interconnections and subminiature integrated circuits.
authors.affiliation: School of Mechanical Engineering and Automation, Beihang University , No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Xinghao
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Mechanical Engineering and Automation, Beihang University , No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Jun
authors.identifier: http://orcid.org/0000-0001-5167-5524
authors.initials: J
authors.lastname: Cai
authors.affiliation: School of Mechanical Engineering and Automation, Beihang University , No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Shi
authors.affiliation: School of Mechanical Engineering and Automation, Beihang University , No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yue
authors.affiliation: School of Mechanical Engineering and Automation, Beihang University , No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Deyuan
authors.initials: D
authors.lastname: Zhang
keywords: alignment; conductive anisotropy; current-carrying capability; directional assembly; microcoil