Template-Stripping Fabricated Plasmonic Nanogratings for Chemical Sensing

Hong, Koh Yiin; Menezes, J. W.; Brolo, Alexandre G.

doi:10.1007/s11468-017-0503-7

Cited by 5 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One way to tackle this problem, and the main motivation of this work, is by replicating the tapered nanopillars in the cicada wings, to take advantage of their optical properties, and to use template stripping to allow the transfer of the metallic nanostructures to another substrate without the gDR1 layer that could potentially mask SERS signals, with the additional benefit of being pitch-customizable to provide antireflective (AR) or signal generation properties at desired wavelengths. Template stripping is a cost-effective and cleanroom-free approach that has been used for transferring other types of metallic nanostructures while preserving their shape and plasmonic efficiency [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Cicada Wing Inspired Template-Stripped SERS Active 3D Metallic Nanostructures for the Detection of Toxic Substances

Nair

Gomez-Cruz

Ascanio

et al. 2021

Sensors

View full text Add to dashboard Cite

This article introduces a bioinspired, cicada wing-like surface-enhanced Raman scattering (SERS) substrate based on template-stripped crossed surface relief grating (TS-CSRG). The substrate is polarization-independent, has tunable nanofeatures and can be fabricated in a cleanroom-free environment via holographic exposure followed by template-stripping using a UV-curable resin. The bioinspired nanostructures in the substrate are strategically designed to minimize the reflection of light for wavelengths shorter than their periodicity, promoting enhanced plasmonic regions for the Raman excitation wavelength at 632.8 nm over a large area. The grating pitch that enables an effective SERS signal is studied using Rhodamine 6G, with enhancement factors of the order of 1 × 104. Water contact angle measurements reveal that the TS-CSRGs are equally hydrophobic to cicada wings, providing them with potential self-cleaning and bactericidal properties. Finite-difference time-domain simulations are used to validate the nanofabrication parameters and to further confirm the polarization-independent electromagnetic field enhancement of the nanostructures. As a real-world application, label-free detection of melamine up to 1 ppm, the maximum concentration of the contaminant in food permitted by the World Health Organization, is demonstrated. The new bioinspired functional TS-CSRG SERS substrate holds great potential as a large-area, label-free SERS-active substrate for medical and biochemical sensing applications.

show abstract

Section: Introductionmentioning

confidence: 99%