Abstract
N-acetylglutathione (NAG)-protected gold nanoparticles self-assemble into three-dimensional (3D) face-centered cubic ( fcc)-type superlattices at an air/water interface under highly acidic conditions. To prepare the well-defined superlattices, 1 month’s incubation is at least necessary since the size growth of the as-prepared nanoparticles is essential. Addition of 4-pyridinecarboxyic acid (PyC), a bifunctional hydrogen-bonding mediator, promotes the formation of the superlattices, which are created for about 2 weeks’ storage. Interestingly, PyC-induced nanoparticle superlattices are in a body-centered tetragonal ( bct) structure. The fcc-to- bct phase transformation would be due to stronger interaction between NAG and PyC than that between NAG molecules on the gold nanoparticle surfaces.
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