New in Science: Freestanding nanosheet films designed using bond-free van der Waals interfaces can conformally stretch and adapt to soft tissues, making them an ideal candidate for the design of adaptable and breathable bioelectronic membranes.
Rigid materials become more flexible when cast as thin sheets, but they will still bump and buckle when subjected to in-plane rotation or twisting motions and thus cannot conformally cover a curved and mobile surface. Yan. formed roughly 10-nanometer-thick freestanding sheets by spin coating films containing flakes of semiconducting materials.
We report the design of van der Waals thin films consisting of staggered two-dimensional nanosheets with bond-free van der Waals interfaces. The films feature sliding and rotation degrees of freedom among the staggered nanosheets to ensure mechanical stretchability and malleability, as well as a percolating network of nanochannels to endow permeability and breathability.
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