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Formation of Highly Ordered Self-Assembled Monolayers on Two-Dimensional Materials via Noncovalent Functionalization
Adam R Brill1,2, Mohan Kumar Kuntumalla1, Graham de Ruiter1
1Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
ACS Applied Materials & Interfaces
|June 27, 2020
Summary
Researchers created highly ordered molecular monolayers on two-dimensional materials (2DMs) using noncovalent self-assembly. This breakthrough enables advanced nanoscale devices by improving surface uniformity and order, confirmed by advanced analytical techniques.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Two-dimensional materials (2DMs) show promise for nanoscale devices.
- Achieving ordered, continuous surface assemblies on 2DMs remains a challenge.
Purpose of the Study:
- To develop a method for generating high-quality, highly ordered monolayers on 2DMs.
- To investigate the orientation of self-assembled molecular platforms on 2DMs.
Main Methods:
- Noncovalent self-assembly of molecular platforms on 2DMs.
- Characterization using time-of-flight secondary ion mass spectrometry, scanning tunnelling microscopy, X-ray photoelectron spectroscopy, and atomic force microscopy.
- Orientation determination using graphene-enhanced Raman spectroscopy (GERS) and surface-enhanced Raman spectroscopy (SERS).
Main Results:
- Successfully generated high-quality and highly ordered monolayers on 2DMs.
- Confirmed the order and uniformity of the self-assembled monolayer layers.
- Determined the orientation of molecular platforms using GERS and SERS by exploiting distance-dependent Raman enhancement.
Conclusions:
- Noncovalent self-assembly is an effective strategy for creating ordered monolayers on 2DMs.
- GERS and SERS provide powerful tools for analyzing molecular orientation on 2DMs.
- This work advances the fabrication of functionalized 2DMs for nanoscale applications.
