2024-09-18 パシフィック・ノースウェスト国立研究所(PNNL)
＜関連情報＞
- https://www.pnnl.gov/news-media/flexible-circuits-made-silk-and-graphene-horizon
- https://www.science.org/doi/10.1126/sciadv.ado4142
二次元シルク Two-dimensional silk
Chenyang Shi, Marlo Zorman, Xiao Zhao, Miquel B. Salmeron, […], and James J. De Yoreo
Science Advances Published:18 Sep 2024
DOI:https://doi.org/10.1126/sciadv.ado4142
Abstract
Despite the promise of silk-based devices, the inherent disorder of native silk limits performance. Here, we report highly ordered two-dimensional silk fibroin (SF) films grown epitaxially on van der Waals (vdW) substrates. Using atomic force microscopy, nano–Fourier transform infrared spectroscopy, and molecular dynamics, we show that the films consist of lamellae of SF molecules that exhibit the same secondary structure as the nanocrystallites of native silk. Increasing the SF concentration results in multilayers that grow either by direct assembly of SF molecules into the lamellae or, at high concentrations, along a two-step pathway beginning with a disordered monolayer that then crystallizes. Scanning Kelvin probe measurements show that these films substantially alter the surface potential; thus, they provide a platform for silk-based electronics on vdW solids.
