Size‐Tunable Gold Aerogels: A Durable and Misfocus‐Tolerant 3D Substrate for Multiplex SERS Detection (Advanced Optical Materials 17/2021)

Zhou, Lin; Peng, Yunyi; Zhang, Na; Du, Ran; Hübner, René; Wen, Xinglin; Li, Dehui; Hu, Yue; Eychmüller, Alexander

doi:10.1002/adom.202170064

Cited by 1 publication

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“…[ 14 ] Therefore, the design of the well‐studied “hot spots” in the NPG film is crucial to preparing the SERS‐active substrate with an affordable and tunable capability. [ 15 ] Although some other strategies have been presented for SERS‐active substrate by conventional lithographic methods (i.e., electron beam, interference, and nanoimprint lithography), [ 16–19 ] these customized manufacturing process of engraving nanostructured surface generally involves equipment‐based expensive techniques and should consider the trade‐off in resolution with throughput. [ 16,20,21 ] Compared to this, the improved SERS properties can be demonstrated with the enhancement of the LSPR in the bicontinuous porous structure by dealloying the NPG film for a suitable structural formation using appropriate fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

Guided Wrinkling of Hierarchically Structured Nanoporous Gold Films for Improved Surface‐Enhanced Raman Scattering Performance

Kim

Jeon

Yoo

et al. 2023

Adv Materials Inter

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Plasmonic nanostructured metals have many advantages for applications in high-performance surface-enhanced Raman scattering (SERS) spectroscopy. In particular, unique designing nanostructures with bicontinuous ligaments surrounded by cylindrical voids with tunable dense pores from a few to hundreds of nanometers can be utilized for the high-performance SERS-active substrate. Here, a fabrication strategy is reported to prepare hierarchically arranged micro/nanostructures of wrinkled nanoporous gold (WNPG) films, which involves laminating of the dealloyed Au film on the heat-shrinkable shape-memory polymer film and geometrical modulation of the substrate. As a result, the various types of WNPG films are crafted with a remarkable density of cracks in the structured surface area. Specifically, the WNPG films consisting of multilayered overlapping features are explored and used as the SERS-active substrate. This dual porosity coupled with localized surface plasmon resonance estimated by numerical simulation in a suitable model of bicontinuous ligaments is found to be the core mechanism for the enhancement of SERS sensitivity, which quantitatively characterizes the "hot spots" from the surface to interlayers. These suggested characteristic features are fully assessed by applying a series of dye molecules and DNA strands on the prepared SERS substrate, demonstrating the enhanced intensity of the Raman scattering signals on the optimized WNPG surface.

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Section: Introductionmentioning

confidence: 99%