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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
Plasmon-mediated chemical surface functionalization at the nanoscale.
Mai Nguyen1, Aazdine Lamouri, Chrystelle Salameh
1Interfaces, Traitements, Organisation et Dynamique des Systèmes, Université Paris Diderot, Sorbonne Paris Cité, CNRS UMR 7086, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France. mangeney@univ-paris-diderot.fr nordin.felidj@univ-paris-diderot.fr.
Researchers developed a new nanoscale surface functionalization method using localized surface plasmon (LSP) excitation. This technique precisely grafts aryl films onto gold nanostripes, enabling controlled nanoscale confinement for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Controlling nanoscale surface grafting is a significant challenge in materials science.
- Developing precise methods for surface functionalization is crucial for advanced material applications.
Purpose of the Study:
- To propose and demonstrate an original strategy for chemical surface functionalization at the nanoscale.
- To utilize localized surface plasmon (LSP) excitation for controlled grafting.
Main Methods:
- Chemical surface functionalization using aryl film grafting derived from a diazonium salt.
- Utilizing localized surface plasmon (LSP) excitation on gold lithographic nanostripes.
- Numerical calculations based on the discrete dipole approximation method to confirm near-field enhancement.
Main Results:
- Aryl film grafting was successfully achieved, covalently bonded to gold nanostripes.
- Grafting occurred specifically in areas of maximum near-field enhancement.
- Incident light energy and LSP wavelength were identified as key parameters controlling aryl film thickness up to ~30 nm.
Conclusions:
- The proposed strategy offers a robust and versatile method for nanoscale surface functionalization.
- This technique enables the nanoscale confinement of functional layers on surfaces.
- Potential applications include molecular sensing and nanooptics.
