Gold Nanoparticles Sliding on Recyclable Nanohoodoos—Engineered for Surface‐Enhanced Raman Spectroscopy. (23rd November 2017)

• Record Type: Journal Article
• Authors: Wu, Kaiyu; Li, Tao; Schmidt, Michael Stenbæk; Rindzevicius, Tomas; Boisen, Anja; Ndoni, Sokol
• Is Part Of: Advanced functional materials. Volume 28:Number 2(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-23
• Subjects: block copolymer lithography -- large‐area SERS uniformity -- recyclable -- SERS substrates -- surface‐enhanced Raman spectroscopy; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201704818
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Robust, macroscopically uniform, and highly sensitive substrates for surface‐enhanced Raman spectroscopy (SERS) are fabricated using wafer‐scale block copolymer lithography. The substrate consists of gold nanoparticles that can slide and aggregate on dense and recyclable alumina/silicon nanohoodoos. Hot‐spot engineering is conducted to maximize the SERS performance of the substrate. The substrate demonstrates remarkably large surface‐averaged SERS enhancements, greater than 10 7 (>10 8 in hot spots), with unrivalled macroscopic signal uniformity as characterized by a coefficient of variation of only 6% across 4 cm. After SERS analyses, the nanohoodoos can be recycled by complete removal of gold via a one‐step, simple, and robust wet etching process without compromising performance. After eight times of recycling, the substrate still exhibits identical SERS performance in comparison to a new substrate. The macroscopic uniformity combined with recyclability at conserved high performance is expected to contribute significantly on the overall competitivity of the substrates. These findings show that the gold nanoparticles sliding on recyclable nanohoodoo substrate is a very strong candidate for obtaining cost‐effective, high‐quality, and reliable SERS spectra, facilitating a wide and simple use of SERS for both laboratorial and commercial applications. Abstract : Cheap, robust, macroscopically uniform, and highly efficient substrates for surface‐enhanced Raman spectroscopy (SERS) are fabricated using block copolymer lithography. A nanohoodoo template in the substrate is recyclable after SERS analyses via a simple wet chemistry process. The renovated substrate exhibits reproducibly low SERS backgrounds and identical SERS performance, in comparison to a new substrate.