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Combined electrodeposition and electropolymerization method to produce surface-bound polystyrenyl NHC thin films
Jessica L Bosso1,2, Justin T Lomax1,2, Garima Garg1,2
1Department of Chemistry, University of Western Ontario London ON N6A 3K7 Canada pragogna@uwo.ca.
Chemical Science
|March 19, 2026
Summary
Durable protective coatings were created using polymeric N-heterocyclic carbene (NHC) films on gold. These robust, nanometer-thick films provide strong metal bonding and hydrophobic insulation for metal protection.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Polymeric N-heterocyclic carbene (NHC) films are emerging as effective materials for durable protective coatings on metals.
- Developing robust, nanometer-scale coatings with strong adhesion and protective properties is crucial for metal surface engineering.
Purpose of the Study:
- To construct and characterize polystyrenyl NHC films on gold surfaces.
- To evaluate the protective capabilities and area-selective deposition of these NHC films.
Main Methods:
- One-step electrodeposition and electropolymerization of styrenyl benzimidazolium halide precursors on gold.
- Ellipsometry for film thickness measurement.
- Cyclic voltammetry for surface passivation analysis.
- Area-selective deposition studies on patterned substrates.
Main Results:
- Nanometer-scale polystyrenyl NHC films (1.2-2.9 nm) were successfully formed on gold.
- Films exhibited strong surface passivation compared to monomeric analogues.
- Excellent area selectivity (up to 0.90) was achieved on patterned Au/SiO2 surfaces.
- Films demonstrated robust inhibition properties.
Conclusions:
- Polystyrenyl NHC films serve as effective nanometer-thick inhibitor coatings.
- These films combine strong NHC-metal bonding with the hydrophobic properties of polystyrene.
- The developed method offers a promising strategy for creating durable protective coatings on metals.
