Abstract
We propose a sheet shape controlling method of tens/hundreds-nm-thick polymer film (called "nanosheet") by using a triple-layered structure and consider composition of the triple-layered structure. The triple-layered structure includes a nanosheet, a stretching layer with internal stress and a supporting layer. The supporting layer and the stretching layer were dissolved in water. The triple-layered structure was folded into a cylindrical shape due to the internal stress and unfolded into a flat shape after dissolution of a stretching layer. In this paper, we considered the solubility and swelling property of the supporting layer and the stretching layer, and considered compositions of the triple-layered structure which is a parameter of unfolding. After soaking in water, Type-A composition (stretching layer - supporting layer - nanosheet) was unfolded into a flat shape, and immediately after folded into a cylindrical shape because of swelling strain mismatch of supporting layer and stretching layer. However, Type-B composition (stretching layer - nanosheet - supporting layer) was able to keep a flat shape after unfolding because swelling strain of the stretching layer and the supporting layer were the same. Therefore, the type-B composition can reduce influence of swelling.
