We describe a simple one-pot water based scheme to produce gold nanoparticle groupings with short interparticle spacings. This approach combines a cross-linking molecule and a hydrophilic passivation layer to control the level of induced aggregation. Suspensions of dimers and trimers are readily obtained using a single electrophoretic purification step. The final interparticle spacings allow efficient coupling of the particle plasmon modes as verified in extinction spectroscopy.

Int. J. Opt.
Photonic Materials

Bidault, S., & Polman, A. (2012). Water-based assembly and purification of plasmon-coupled gold nanoparticle dimers and trimers. Int. J. Opt., 2012(Article number: 387274), 1–5. doi:10.1155/2012/387274