4.8 Article

De Novo Synthesis of Free-Standing Flexible 2D Intercalated Nanofilm Uniform over Tens of cm2

Journal

ADVANCED MATERIALS
Volume 34, Issue 22, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106465

Keywords

fullerene; hydrogen-bonding network; intercalated structure; proton conductivity; supramolecular polymerization; 2D material; ultrathin film

Funding

  1. JSPS [KAKENHI JP19H05459, JP19H05719, JP20H05205, P17782]
  2. Nakatani Foundation

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This article reports the de novo synthesis of a 3-nm-thick nanofilm intercalating a hydrogen-bonded network between two layers of fullerene molecules, leading to high proton conductivity. The film can be uniformly formed at an air/water interface and transferred to various substrates, showing reversible bending under electron beam irradiation.
Of a variety of intercalated materials, 2D intercalated systems have attracted much attention both as materials per se, and as a platform to study atoms and molecules confined among nanometric layers. High-precision fabrication of such structures has, however, been a difficult task using the conventional top-down and bottom-up approaches. The de novo synthesis of a 3-nm-thick nanofilm intercalating a hydrogen-bonded network between two layers of fullerene molecules is reported here. The two-layered film can be further laminated into a multiply film either in situ or by sequential lamination. The 3 nm film forms uniformly over an area of several tens of cm(2) at an air/water interface and can be transferred to either flat or perforated substrates. A free-standing film in air prepared by transfer to a gold comb electrode shows proton conductivity up to 1.4 x 10(-4) S cm(-1). Electron-dose-dependent reversible bending of a free-standing 6-nm-thick nanofilm hung in a vacuum is observed under electron beam irradiation.

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