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Gold nanoparticles protected with pH and temperature-sensitive diblock copolymers.

Markus Nuopponen¹, Heikki Tenhu

¹Laboratory of Polymer Chemistry, University of Helsinki, PB 55, FIN-00014 HY, Finland.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 14, 2007

Summary

Stimuli-responsive gold nanoparticles coated with poly(methacrylic acid)-block-poly(N-isopropylacrylamide) form pH- and temperature-sensitive aggregates. These aggregates exhibit changes in size and surface plasmon resonance, offering tunable nanoparticle behavior.

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Area of Science:

Nanotechnology
Polymer Chemistry
Materials Science

Background:

Stimuli-responsive materials offer tunable properties for advanced applications.
Block copolymers provide versatile platforms for nanoparticle functionalization.
Gold nanoparticles exhibit unique optical properties sensitive to their environment.

Purpose of the Study:

To synthesize and characterize stimuli-sensitive gold nanoparticles.
To investigate the effect of pH and temperature on nanoparticle aggregate behavior.
To understand the role of specific polymer blocks in controlling nanoparticle assembly.

Main Methods:

Synthesis of poly(methacrylic acid)-block-poly(N-isopropylacrylamide) (PMAA-b-PNIPAM) via RAFT polymerization.
One-pot preparation of gold nanoparticles coated with PMAA-b-PNIPAM.

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Analysis of aggregate size and surface plasmon resonance (SPR) shifts under varying pH and temperature conditions.

Main Results:

PMAA-b-PNIPAM coated gold nanoparticles form stimuli-sensitive aggregates in aqueous dispersion.
Aggregate size is significantly influenced by pH, while temperature has a moderate effect.
A blue shift in SPR is observed with decreasing pH and increasing temperature, indicating environmental sensitivity.

Conclusions:

The diblock copolymer effectively imparts stimuli-responsive behavior to gold nanoparticles.
The PMAA block governs colloidal stability, while the PNIPAM block influences the local environment polarity.
These findings demonstrate potential for controlled nanoparticle assembly in response to external stimuli.