Square‐Micrometer‐Sized, Free‐Standing Organometallic Sheets and Their Square‐Centimeter‐Sized Multilayers on Solid Substrates

Abstract

Oligofunctional terpyridine-based monomers are spread at an air/water interface, where they are connected with transition metal salts such as Fe(II) into mechanically coherent monolayer sheets of macroscopic dimension. The conversions of these processes are determined by XPS for several monomer/metal ion combinations. The sheets are transferred onto TEM grids, the 20 × 20 square micrometer sized holes of which can be spanned. AFM indentation experiments provide in-plane elastic moduli which are compared with naturally occurring sheets such as graphene. The new organometallic sheets are also used to create multilayer assemblies on square centimeter length scales on solid substrates. Finally some directions are provided where this research can lead to in future and where its application potential lies.

Wafer-sized multifunctional polyimine-based two-dimensional conjugated polymers with high mechanical stiffness

“…32), and is much higher than E Young of organic monolayers with∼66% reaction conversion, such as bis(terpyridine)-metal complex nanosheet (16 GPa) (ref. 33) and cycloaddition-induced anthracene nanosheet (11 GPa) (ref. 34), which reflect the high crystallinity and mechanical stiffness of the achieved monolayer 2DP in this work.…”

“…The monolayer 2DP was prepared at an air–water interface of a Langmuir-Blodgett trough (Minitrough, KSV NIMA, Finland)33. The trough was equipped with a platinum Wilhelmy plate, a Taflon dipper and a pair of Delrin barriers.…”

Makroskopische kristalline 2D‐Polymere

“…Dies wird durch die geringe Rauheit der Grenzfläche ermçglicht, die sich mit lediglich ca. Die funktionellen Gruppen, welche fürd iese Interaktion verantwortlich sind, sind in den Monomeren 6-9 [121,122,145] basische N-Heterozyklen, in den Monomeren 10 und 11 Thiole, [54,55,146] in den Monomeren 12 und 14 Aldehyde sowie aromatische Amine in den Monomeren 13 und 15. Es kann daher zwanglos angenommen werden, dass hydrophobe Gruppen potentieller Monomere sich in einer Ebene befinden und auch nur in dieser Ebene miteinander reagieren kçnnen.…”

“…Als repräsentatives Beispiel werden in der Folge Synthese und Analytik des aus 6 hergestellten 2D-Materials beschrieben (Abbildung 4): [121,122,145] Monomer 6 als hochverdünnte Lçsung an der Wasser/Luft-Grenzfläche in einem LBT (Abbildung 4a)gespreitet führt zur Bildung einer homogenen Schicht. Als repräsentatives Beispiel werden in der Folge Synthese und Analytik des aus 6 hergestellten 2D-Materials beschrieben (Abbildung 4): [121,122,145] Monomer 6 als hochverdünnte Lçsung an der Wasser/Luft-Grenzfläche in einem LBT (Abbildung 4a)gespreitet führt zur Bildung einer homogenen Schicht.…”

Hybrid van der Waals heterostructures of zero-dimensional and two-dimensional materials

“…3d shows a homogeneous freestanding JNM/(C 60 -JNM) 3 heterostructure spanning over an orifice with dimensions of 40 × 44 μm 2 . [37][38][39] It is equal to E Young multiplied by the thickness of the sheet. 3e shows some wrinkles, which increase the imaging contrast and help to identify the freestanding membrane by HIM.…”