A versatile, fast, and efficient method of visible-light-induced surface grafting polymerization.

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Chemistry

Background:

• The lability of the gold-sulfur (Au-S) bond presents challenges in surface modification.
• Developing robust methods for surface grafting polymerization is crucial for creating functional interfaces.

Purpose of the Study:

• To demonstrate the use of Mn2(CO)10 for visible-light-induced surface grafting polymerization on Au surfaces.
• To overcome the limitations associated with the Au-S bond lability.
• To develop a facile and efficient method for creating functional polymer interfaces.

Main Methods:

• Visible-light-induced surface grafting polymerization using Mn2(CO)10 as an initiator.
• Polymerization of N-isopropylacrylamide (PNIPAAm) on Au surfaces.
• Characterization of grafted polymer films using ellipsometry.

Main Results:

• Achieved controlled polymerization with a linear relationship between film thickness and monomer concentration.
• Formed poly(N-isopropylacrylamide) (PNIPAAm) films up to ~200 nm thick in just 10 minutes at room temperature.
• Demonstrated the versatility of the method by grafting various polymers onto different substrates and immobilizing polymers on Au surfaces.

Conclusions:

• The Mn2(CO)10-initiated visible-light-induced grafting method offers a simple, efficient, and fast approach for polymer functionalization of Au surfaces.
• This technique overcomes Au-S bond lability issues and shows potential for designing diverse functional interfaces.
• The method's mild conditions and substrate-binding capabilities of catecholic derivatives enhance its applicability.