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Hybrid Plasmonic Nanostructures Using π-Conjugated Systems for Molecularly Imprinted Polymers.

Pierre Bleteau¹, Sarra Gam-Derouich¹, Thi Duyen Dinh^1,2

¹Université Paris Cité, CNRS, ITODYS, F-75013 Paris, France.

|April 30, 2026

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This study introduces advanced synthetic receptors called π-conjugated molecularly imprinted polymers (MIPs) for sensitive molecule detection. These novel polymers, integrated with plasmonic nanoparticles, enable highly sensitive detection of methylene blue (MB).

Area of Science:

Materials Science and Engineering
Nanotechnology
Analytical Chemistry

Background:

Molecularly imprinted polymers (MIPs) are synthetic receptors with tailored binding sites for specific molecules.
Traditional MIPs often use poly(methyl acrylates) and hydrogen bonding, limiting their functional integration.
Extending MIPs to π-conjugated systems offers enhanced functionality for molecular recognition.

Purpose of the Study:

To explore the integration of π-conjugated polymers with plasmonic nanostructures for molecular sensing.
To develop a sensitive detection platform for methylene blue (MB) using a PEDOT-based MIP.
To investigate the combined use of localized surface plasmon resonance (LSPR) and surface-enhanced Raman Scattering (SERS) for enhanced detection.

Main Methods:

Keywords:

molecularly imprinted polymers (MIPs)plasmonic nanostructure π-conjugated polymers

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Fabrication of gold nanoparticle dimers using electron-beam lithography to create a plasmonic platform.
Confined growth of a PEDOT-based imprinted polymer within the nanogaps of the gold nanoparticle dimers.
Detection of methylene blue (MB) using LSPR shift and SERS measurements.

Main Results:

The PEDOT-based MIP successfully formed molecularly imprinted cavities within the nanogaps.
MB detection was achieved through measurable LSPR shifts and distinct SERS signals.
The sensing platform demonstrated sensitivity down to nanomolar concentrations of MB.

Conclusions:

The combination of π-conjugated MIPs and plasmonic nanostructures provides a highly sensitive molecular sensing platform.
This approach demonstrates the potential of functionalized MIPs for advanced analytical applications.
The study highlights the synergy between plasmonics and imprinted polymers for efficient molecular detection.