Dated: Mar 26, 2022
Publication Name: Applied Materials Today
Citations : Surface engineering of plasmonic gold nanoisland platforms for high-sensitivity refractometric biosensing applications
Plasmonic chips comprising gold nanoisland structures that are fabricated by solution-phase seeding, have demonstrated excellent promise as high-sensitivity substrates for molecular detection and medical diagnostic applications. Even so, there still remains an outstanding need to examine the potential utility of these plasmonic chips for label-free refractometric biosensing and to understand how nanostructure design principles affect measurement sensitivity. Herein, we developed a thiol-based surface functionalization strategy to fabricate gold nanoislands on a functionalized glass surface with improved fractional surface coverages and inter-island gap distances of 80–85% and 5–10 nm, respectively, as compared to values of 50–65% and 15–20 nm for gold nanoislands on bare glass substrates.
Contributors: Youngkyu Hwang, Abdul Rahim Ferhan, Bo Kyeong Yoon, Tun Naw Sut, Won-Yong Jeon, Dong Jun Koo, Joshua A. Jackman, Nam-Joon Cho