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Communication

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

1
Department of Chemical Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada
2
Instituto de Ciencias Aplicadas y Desarrollo Tecnológico (ICAT), Universidad Nacional Autónoma de México (UNAM), Cto. Exterior S/N, C.U., Coyoacán, Ciudad de México 04510, Mexico
3
Department of Physics and Space Science, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Eduard Llobet
Sensors 2021, 21(5), 1699; https://doi.org/10.3390/s21051699
Received: 26 January 2021 / Revised: 18 February 2021 / Accepted: 24 February 2021 / Published: 2 March 2021
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. View Full-Text
Keywords: bioinspired nanostructure; surface-enhanced Raman spectroscopy; surface relief gratings; melamine detection; cicada wing nanostructure bioinspired nanostructure; surface-enhanced Raman spectroscopy; surface relief gratings; melamine detection; cicada wing nanostructure
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MDPI and ACS Style

Nair, S.; Gomez-Cruz, J.; Ascanio, G.; Docoslis, A.; Sabat, R.G.; Escobedo, C. Cicada Wing Inspired Template-Stripped SERS Active 3D Metallic Nanostructures for the Detection of Toxic Substances. Sensors 2021, 21, 1699. https://doi.org/10.3390/s21051699

AMA Style

Nair S, Gomez-Cruz J, Ascanio G, Docoslis A, Sabat RG, Escobedo C. Cicada Wing Inspired Template-Stripped SERS Active 3D Metallic Nanostructures for the Detection of Toxic Substances. Sensors. 2021; 21(5):1699. https://doi.org/10.3390/s21051699

Chicago/Turabian Style

Nair, Srijit, Juan Gomez-Cruz, Gabriel Ascanio, Aristides Docoslis, Ribal G. Sabat, and Carlos Escobedo. 2021. "Cicada Wing Inspired Template-Stripped SERS Active 3D Metallic Nanostructures for the Detection of Toxic Substances" Sensors 21, no. 5: 1699. https://doi.org/10.3390/s21051699

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