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. © 2010 by the authors.
Wan, M., Luo, P., Jin, J., Xing, J., Wang, Z., & Wong, S. T. C. (2010). Fabrication of localized surface plasmon resonance fiber probes using ionic self-assembled gold nanoparticles. Sensors, 10(7), 6477–6487. https://doi.org/10.3390/s100706477