Fabrication of Localized Surface Plasmon Resonance Fiber Probes Using Ionic Self-Assembled Gold Nanoparticles

• Main Authors: Miao Wan, Pengfei Luo, Jiayi Jin, Jiong Xing, Zhiyong Wang, Stephen T. C. Wong
• Format: Article
• Language: English
• Published: MDPI AG 2010-07-01
• Series: Sensors
• Subjects: localized surface plasmon resonance; ionic self-assembled multilayers; fiber optics; biosensors
• Online Access: http://www.mdpi.com/1424-8220/10/7/6477/

An nm-thickness composite gold thin film consisting of gold nanoparticles and polyelectrolytes is fabricated through ionic self-assembled multilayers (ISAM) technique and is deposited on end-faces of optical fibers to construct localized surface plasmon resonance (LSPR) fiber probes. We demonstrate that the LSPR spectrum induced by ISAM gold films can be fine-tuned through the ISAM procedure. We investigate variations of reflection spectra of the probe with respect to the layer-by-layer adsorption of ISAMs onto end-faces of fibers, and study the spectral variation mechanism. Finally, we demonstrated using this fiber probe to detect the biotin-streptavidin bioconjugate pair. ISAM adsorbed on optical fibers potentially provides a simple, fast, robust, and low-cost, platform for LSPR biosensing applications.