Format

Send to

Choose Destination
Small. 2016 Sep;12(36):5081-5089. doi: 10.1002/smll.201600533. Epub 2016 May 9.

Dispersive Plasmon Damping in Single Gold Nanorods by Platinum Adsorbates.

Xu P1,2, Lu X1, Han S1, Ou W1, Li Y1,2, Chen S1,2, Xue J1,2, Ding Y2, Ni W3.

Author information

1
Division of i-Lab & Key Laboratory for Nano-Bio Interface Research, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China.
2
Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.
3
Division of i-Lab & Key Laboratory for Nano-Bio Interface Research, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China. whni2012@sinano.ac.cn.

Abstract

Surface modifications of plasmonic nanoparticles with metal adsorbates are essential in applications such as plasmonic sensing, plasmon-enhanced photocatalysis, etc., where spectral broadening is usually observed. A single particle study is presented on plasmon damping by adsorption of platinum (Pt) clusters. Single particle dark-field spectroscopy is employed to measure exactly the same gold nanorod before and after the Pt adsorption. The Pt-induced plasmon damping in terms of linewidth increase is found dependent on the resonance wavelength of the measured nanorod, which is dispersive in nature. The measured dispersion generally matches the theoretical prediction, and it basically exhibits a gradual increase with decreasing resonance energy. This increase can be attributed to the fact that the nanorod as a better resonator is more susceptible to the Pt adsorption than the spherical particles. Moreover, simulated results based on discrete dipole approximation method further indicate that the damping is mainly contributed from the adsorbates on the ends of the nanorod and independent on the type of the metal adsorbed. Knowledge and insights gained in this study can be very important for the design and fabrication of plasmonic heterostructures as functional nanomaterials.

KEYWORDS:

dark-field spectroscopy; gold nanorods; plasmon damping; plasmonic resonance; surface scattering

PMID:
27159087
DOI:
10.1002/smll.201600533

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center