The modulation of interparticle distances in aggregates of gold nanoparticles by light irradiation is described. Stable aggregates of a series of imidazolium-presenting gold nanoparticles were obtained via a photo-responsive mono-carboxylate linker. By irradiating the aggregates with ultraviolet, the photo-responsive linker was transformed, leading to the generation of another carboxyl group. As a result, the gold nanoparticles were tightly bound via the dicarboxylate linkers. These changes decreased the interparticle distances in the aggregates, as verified by microscopic observations, and can induce significant changes in their optical characteristics.
- Kazuo Tanaka
- Kensuke Naka
- Yoshiki Chujo
