Plasmonic Properties of the End-to-End and Side-by-Side Assembled Au Nanorods

• DOI: 10.1007/s11468-014-9784-2
• Publication Date: 2014-09-04T14:44:13Z
• Authors: Jinsheng Liu; Caixia Kan; Yuling Li; Haiying Xu; Yuan Ni; Daning Shi
• Keywords: 01 natural sciences; 0104 chemical sciences

Well-defined assemblies of Au nanorods (NRs) exhibit outstanding optical and electric properties, including surface plasmon resonance (SPR) of an individual nanorod and the coupling SPR among the assemblies. We present a direct approach for end-to-end (E-E) and side-by-side (S-S) assembly of Au NRs using poly (ethylene glycol) dithiol (HS-PEG-SH) and cysteine (Cys), respectively. The coupling SPR properties between the neighboring Au NRs are studied through experimental measurements and finite-different time-domain (FDTD) simulations. The simulated SPR tunability over the assembly agree with that of the experimental results, and both of the longitudinal SPR shifts for E-E and S-S assemblies are well fitted with the exponential function. The present assembled method provides a way for directing anisotropic nanostructures into well-defined orientations, and will be potentially useful in optoelectronics and biomedical engineering.