Synthesis and self-assembly of lipid (DMPC)-conjugated gold nanoparticles

TL;DR

This paper reports the synthesis of lipid-conjugated gold nanoparticles and their self-assembly into monolayer structures, highlighting a new method for creating ordered nanostructures with potential applications in metamaterials and nanocircuits.

Contribution

It introduces a novel synthesis and assembly method for lipid-conjugated gold nanoparticles using phase transfer and Langmuir-Blodgett techniques.

Findings

Successful synthesis of lipid-conjugated gold nanoparticles.

Formation of self-assembled monolayer structures confirmed by compression isotherms.

Characterization using UV-Vis, DLS, and TEM verified nanoparticle properties.

Abstract

Bio-conjugated nanomaterials play a promising role in the development of novel supramolecular structures, molecular machines, and biosensing devices. In this study, lipid-conjugated gold nanoparticles were synthesized and allowed to form a self-assembled monolayer structure. The nanoparticles were prepared by a phase transfer method, which involved the reduction of potassium tetrachloroaurate (III) by sodium citrate in an aqueous solution and the simultaneous transfer of the reduced species to an organic medium containing DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine). The gold nanoparticles were characterized using UV-Vis spectroscopy and dynamic light scattering (DLS) particle-size analysis. In addition, the resulting nanoparticles were examined using transmission electron microscopy (TEM). The Langmuir-Blodgett (LB) technique was used to assemble the DMPC-capped nanoparticles onto a water subphase at room temperature. The measurement of the compression isotherm confirmed the assemblage of lipid capped gold nanoparticles. This method of synthesis of ordered structures utilizing molecular interactions of lipids will be useful in developing novel metamaterials and nanocircuits.