Buttered side up: A one nanometer thick membrane with different functional groups on each side was fabricated from self‐assembled monolayers of aromatic molecules. The amino side of this Janus membrane was modified with tetramethylrhodamine (TMR) fluorescent dye, and the thiol side with ATTO647N (see picture). The functionalization and functionality of the nanomembrane were demonstrated by X‐ray photoelectron spectroscopy and fluorescence microscopy.

Self-assembled monolayers (SAMs) of 1,1'-biphenyl-4-thiol (H-(C(6)H(4))(2)-SH) on Au(111) were prepared from solution or via vapor deposition in ultrahigh vacuum and characterized by scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and X-ray photoelectron spectroscopy (XPS). In contrast to the typically observed for densely packed alkane-thiol SAMs on Au(111) (√3 × √3)R30° structure, the densely packed aromatic biphenylthiol SAMs prepared by both methods exhibit an unusual hexagonal (2 × 2) structure. Upon annealing at 100 °C, this structure evolves into the (2 × 7√3) structure resulting in the formation of highly ordered pinstripes oriented along the [1 -1 0] directions. Lower density SAMs, prepared by vapor deposition in vacuum, show mixed structures comprising the hexagonal (2 × 2) structure and two rectangular arrangements with the unit cells of (3√3 × 9) and (2√3 × 8). An extinction of the (3√3 × 9) structure in the favor of the (2√3 × 8) structure is observed upon annealing at temperatures of ~100 °C.

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Aus einer selbstorganisierten Monoschicht aromatischer Moleküle wurde eine 1 nm dicke Membran mit Aminofunktionen an der Ober‐ und Thiolfunktionen an der Unterseite hergestellt. Die beiden Seiten dieser „Janus‐Membran“ können mit unterschiedlichen Fluoreszenzfarbstoffen funktionalisiert werden: die Aminoseite mit Tetramethylrhodamin (TMR), die Thiolseite mit ATTO647N. Diese Funktionalisierung der Nanomembranen wurde durch Röntgen‐Photoelektronenspektroskopie und Fluoreszenzmikroskopie bestätigt.