Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2014, Article ID 175670, 7 pages
http://dx.doi.org/10.1155/2014/175670
Research Article

Fabrication of Gold Nanodot Array for the Localized Surface Plasmon Resonance

Korea Electrotechnology Research Institute, 111 Hanggaul-ro, Ansan 426-170, Republic of Korea

Received 23 July 2014; Revised 24 September 2014; Accepted 25 September 2014; Published 13 October 2014

Academic Editor: Chunyi Zhi

Copyright © 2014 Young Min Bae et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Localized surface plasmon resonance (LSPR) is a promising method for detecting antigen-antibody binding in label-free biosensors. In this study, the fabrication of a LSPR substrate with a gold nanodot array through the lift-off process of an alumina mask is reported. The substrate showed an extinction peak in its extinction spectrum, and the peak position was dependent on the height of the gold nanodot array, and the change of extinction peak with the height could be predicted by the numerical simulation. In addition, the peak position was observed to be red-shifted with the increasing RIU value of the medium surrounding the gold nanodot array. In particular, the peak position in the 10 nm thick gold nanodot array was approximately 710 nm in air, and the sensitivity, defined as the ratio of the shift of peak position to the RIU of the medium, was 323.6 nm/RIU. The fabrication procedure could be applied to fabricate the LSPR substrates with a large area.