Manipulation of hot-spot densities inside Ag bundle patterns by controlling the Ag nanostructure size for reliable and ultra-sensitive SERS substrates

Taeksu Lee; Soongeun Kwon; Hyungjun Lim; Jae-Jong Lee

doi:10.1117/12.2544742

21 February 2020 Manipulation of hot-spot densities inside Ag bundle patterns by controlling the Ag nanostructure size for reliable and ultra-sensitive SERS substrates

Taeksu Lee, Soongeun Kwon, Hyungjun Lim, Jae-Jong Lee

Author Affiliations +

Proceedings Volume 11257, Plasmonics in Biology and Medicine XVII; 112570V (2020) https://doi.org/10.1117/12.2544742
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

Surface-enhanced Raman spectroscopy (SERS) has enormous potential as a highly sensitive (to a single-molecular level) and molecular-specific analytical technique for biological imaging and sensing. For the reliable SERS sensing, fabrication of metal nanostructures bundle patterns with multiple narrow nano-gaps over the homogenous macroscale is important pre-requisite due to their enhanced properties. Unfortunately, the fabrication of dense and uniform nano-gaps without organic materials is rather difficult since they usually have required complicated and a number of synthetic steps. In this research, we propose a facile and efficient methodology for manipulation of nano-gap densities inside Ag bundle patterns (ABPs) by controlling the Ag nanostructure size over a large area. Especially, we successfully demonstrate the fabrication of high-density small nano-gaps (about 2.5 nm) between silver nanostructure array patterns. We generated uniform nano-hole patterns over the entire substrate through nano-imprint lithography and silver nanostructures were deposited via electrodeposition. The relative size of Ag nanostructure elements was controlled by the Ag precursor concentration. Finally, we fully demonstrate their application in the rapid detection of rhodamine 6G (R6G) molecules by SERS with a very low detection limit as well as excellent signal uniformity, indicating an extraordinary capability for single-molecule detection.

Citation Download Citation

Taeksu Lee, Soongeun Kwon, Hyungjun Lim, and Jae-Jong Lee "Manipulation of hot-spot densities inside Ag bundle patterns by controlling the Ag nanostructure size for reliable and ultra-sensitive SERS substrates", Proc. SPIE 11257, Plasmonics in Biology and Medicine XVII, 112570V (21 February 2020); https://doi.org/10.1117/12.2544742

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KEYWORDS

Silver

Nanostructures

Raman spectroscopy

Metals

Surface enhanced Raman spectroscopy

Molecules

Nanoimprint lithography

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