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From Langmuir-Blodgett to Grafted Films
M Gabaji1, J Médard2, A Hemmerle3
1Université Paris-Saclay, CNRS, Institut Galien Paris Sud, 92296 Châtenay-Malabry, France.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 20, 2020
Summary
This study presents a novel method for creating highly stable, organized monolayer films on gold surfaces. These films, formed using Langmuir-Blodgett (LB) techniques and electrografting, offer superior durability and structural integrity.
Area of Science:
- Surface science
- Materials chemistry
- Nanotechnology
Background:
- Langmuir-Blodgett (LB) films are known for their ordered structures but often lack stability.
- Electrografted films offer strong adhesion but can be less organized.
- A method combining the strengths of both techniques is needed for robust surface modification.
Purpose of the Study:
- To develop a novel technique for creating stable, organized monolayer films on gold surfaces.
- To combine the structural organization of LB films with the strong adhesion of electrografted films.
- To characterize the properties of these novel surface films.
Main Methods:
- Transfer of octadecylamine (ODA) or octadecanol (ODOH) Langmuir-Blodgett (LB) films onto a gold (Au) surface.
- Simultaneous oxidative electrografting of the LB film while in contact with the aqueous subphase.
- Characterization using atomic force microscopy (AFM), water contact angle, ellipsometry, X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRRAS), and grazing incidence X-ray diffraction (GIXD).
Main Results:
- A locally organized monolayer film strongly attached to a gold surface was successfully obtained.
- The resulting films demonstrated resistance to ultrasonication, unlike conventional LB films.
- The films maintained monolayer organization by construction, unlike typical electrografted films.
- Comprehensive characterization confirmed the structural integrity and organization of the films.
Conclusions:
- The combined LB transfer and oxidative electrografting method yields highly stable and organized monolayer films on gold.
- This technique overcomes the limitations of traditional LB films and electrografted films.
- The developed films are suitable for applications requiring robust and well-defined surface modifications.
