writer：Jinrui Huang, Yutian Zhu,*Wei Jiang,*Jinghua Yin,Qingxin Tang, and Xiaodong Yang
keywords：conductive anisotropy, carbon nanotube, shear flow, hierarchical assembly, thin film
source：期刊
specific source：ACS Appl. Mater. Interfaces
Issue time：2014年
In our previous study (Mao et al. J. Phys. Chem. Lett. 2013, 4,
43?47), we proposed a novel method, that is, the shear-flow-induced
hierarchical self-assembly of two-dimensional fillers (octadecylamine-functionalized
graphene) into the well-ordered parallel stripes in a polymer matrix, to
fabricate the anisotropic conductive materials. In this study, we extend this
method to one-dimensional multiwalled carbon nanotubes (MWCNTs).
Under the induction of shear flow, the dispersed poly(styrene ethylene/
butadiene-styrene) (SEBS) phase and MWCNTs can spontaneously assemble
into well-ordered parallel stripes in the polypropylene (PP) thin film. The
electrical measurements indicate that the electrical resistivity in the direction
parallel to the stripes is almost 6 orders of magnitude lower than that in the
perpendicular direction, which is by far the most striking conductive
anisotropy for the plastic anisotropic conductive materials. In addition, it is
found that the size of the MWCNT stripe as well as the electrical property of
the resulting anisotropic conductive thin film can be well-controlled by the gap of the shear cell.