Nanorod Self-Assembly for Tuning Optical Absorption

作者：Hore Michael J A; Composto Russell J^*

来源：ACS Nano, 2010, 4(11): 6941-6949.

DOI：10.1021/nn101725j

• gold nanorods
• polymer nanocomposites
• alignment
• surface plasmon coupling

Metallic nanoparticles that absorb and concentrate light are leading to greater efficiencies in nanophotonic devices By confining gold nanorods (Au NRs) in a polymer film, we can control their spacing and orientation and, in turn, the absorption and polorization characteristics of the nanocomposite In this study, we systematically increase the volume fraction fo Au NRs (phi(rod)) aspect ratio v = 3.3) while maintaining uniform dispersion As phi(rod) increases from 1 to 16 vol %, the spacing between rods decreases from 120 to 20 nm and scales as phi(-0 4)(rod) Simultaneously, the local 2D orientational order parameter increases linearly with phi(rod) although the rods are globally isotropic The Au NR dispersion is found to depend on the enthaipic interactions between poly(ethylene glycol) brush grafted a red shift with increasing phi(rod), and coupling is observed for separations up to 70 nm Because NR spacing and orientation can be finely controlled using polymer matrix, these films are ideally sited for understanding fundamental behavior (e g, plasmon coupling) as well as practical devices (e g, solar cells)

• 出版日期2010-11