Site-selective growth of Ag nanoparticles controlled by localized surface plasmon resonance of nanobowl arrays.

Abstract

Hexagonal Ag nanoparticle arrays are exclusively grown on top of the interstices of Au nanobowl arrays. The photoinduced effect of the enhanced electromagnetic field between Au nanobowls accelerated the chemical reaction and is responsible for Ag growth in defined local positions. The enhanced electric field of the Au nanobowl array induced a photoreaction, which resulted in Ag growth in the hot area. Interestingly, the sizes and positions of the Ag nanoparticles distributed in the strong electric field of the Au nanobowl array are easily controlled. A six-axis symmetric pattern of Ag nanoparticle growth is realized based on the use of vertically incident circularly polarized light. Furthermore, a three-axis symmetric nanoperiodic structure is obtained through the use of linearly polarized oblique waves with specific incidence angles. This research shows that an electric field can be used to control a chemical reaction at the nanometer level, enabling the control and design of a wide variety of nanoperiodic structures.