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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
Published on: June 14, 2024
Self-assembled monolayers derived from alkoxyphenylethanethiols having one, two, and three pendant chains
Supachai Rittikulsittichai1, Andrew C Jamison, T Randall Lee
1Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 14, 2011
Summary
Researchers developed new alkoxyphenylethanethiol adsorbates for self-assembled monolayer (SAM) coatings. While R1ArMT forms ordered films, R2ArMT and R3ArMT show decreased order and packing density, impacting material properties.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Self-assembled monolayers (SAMs) are crucial for surface modification and creating functional coatings.
- Developing versatile adsorbates is key to controlling SAM composition and properties.
- Alkoxyphenylethanethiols offer a promising scaffold for designing novel SAM-forming molecules.
Purpose of the Study:
- To design, synthesize, and investigate alkoxyphenylethanethiol-based adsorbates with varying numbers of octadecyloxy chains.
- To evaluate the impact of these adsorbates on the structural order and packing density of resulting self-assembled monolayers (SAMs).
- To explore their potential for creating compositionally versatile "mixed" SAM coatings.
Main Methods:
- Synthesis of alkoxyphenylethanethiol adsorbates with one (R1ArMT), two (R2ArMT), and three (R3ArMT) pendant octadecyloxy chains.
- Characterization of resultant SAMs using ellipsometry, contact angle goniometry, PM-IRRAS, and XPS.
- Analysis of monolayer film order, crystallinity, molecular packing, and chain tilt.
Main Results:
- R1ArMT formed a well-ordered monolayer film.
- R2ArMT and R3ArMT generated monolayer films with diminished conformational order and crystallinity.
- SAMs from R2ArMT and R3ArMT exhibited reduced chain tilt and smaller surface area per chain compared to C18 and R1ArMT.
Conclusions:
- The number and substitution pattern of pendant chains significantly influence the order and packing of alkoxyphenylethanethiol-based SAMs.
- R1ArMT is suitable for ordered monolayer formation, while R2ArMT and R3ArMT offer pathways to less ordered structures with altered packing.
- These findings provide insights for designing adsorbates for tailored SAM coatings with specific surface properties.
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