A PHD student at the Institute of Metal Research, Chinese Academy of Sciences.
Flexible Polymer Composite Films with Anisotropic FeCo Nanoparticle Chains for Highly Stretchable Magnetic Device
Jie Yuan 1,2, Zhi-Quan Liu *1,2 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Flexible and stretchable electronics are highly desirable for next generation devices. As well known, the combination of a polymer matrix and magnetic nanoparticles is commonly adopted to make flexible magnetic polymer nanocomposites, which possess the advantages of polymeric materials and the magnetic properties brought by the nanoparticles. However, stretchability and magnetism are fundamentally difficult to combine for conventional magnetic composite films. In this work, perfect FeCo nanocubes were firstly reported as magnetic filler to fabricate composite films, which have a profound effect on the tensile property and magnetic property of the films. Magnetic field induced self-assembly is used to successfully fabricate flexible and anisotropic FeCo nanochain- PDMS composite films. The embedded nanochains are controllable in average length (< 200m) and width (< 2m) through optimizing the filler mass fraction and the magnetic field intensity, and an ultra-high aspect ratio of 150 can be achieved. In-situ observations on the growth of a 600m long nanochain verify the connection and coarsening mechanism. The highest tensile strength in the tension direction perpendicular to the nanochains is 3.20MPa for the composite film fabricated at 60mT with 1.0wt% of filler, which is 85.0% higher than that of the pure PDMS films (1.73MPa). The different tensile strength and hysteresis loop indicate that the films with alined nanochains have mechanical and magnetic anisotropy. By controlling fabrication, one can tune the mechanical performance and magnetic anisotropy of the thin polymer nanocomposite films synchronously, which enhances their potential applications especially for highly stretchable devices.
Key Words: Anisotropic polymer nanocomposite films, Magnetic FeCo nanocubes, Self-assembly, Magnetic property
Jie Yuan, a PHD student at the Institute of Metal Research, Chinese Academy of Sciences. His major is microelectronic packaging technology and flexible thermal management materials.
The Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS) was founded in 1953. Since then, IMR has firmly established itself as an indispensable base for materials science and engineering research in China. Research at IMR focuses mainly on high performance metallic materials, new types of inorganic nonmetallic materials, and advanced composite materials. IMR’s research is directed towards the understanding and characterization of materials properties, structure and performance, as well as materials synthesis and fabrication, processing, and application.