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  Mesoporous one-component gold microshells as 3D SERS substrates

Vikulina, A., Stetsyura, I. Y., Onses, M. S., Yilmaz, E., Skirtach, A. G., & Volodkin, D. (2021). Mesoporous one-component gold microshells as 3D SERS substrates. Biosensors, 11(10): 380. doi:10.3390/bios11100380.

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 Creators:
Vikulina, Anna1, Author           
Stetsyura, Inna Y., Author
Onses, M. Serdar, Author
Yilmaz, Erkan, Author
Skirtach, Andre G., Author
Volodkin, Dmitry, Author
Affiliations:
1Rumiana Dimova, Theorie & Bio-Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863328              

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Free keywords: calcium carbonate; vaterite; hard templating; Raman spectroscopy; microparticles
 Abstract: Surface-enhanced Raman scattering (SERS) is a powerful analytical tool for label-free analysis that has found a broad spectrum of applications in material, chemical, and biomedical sciences. In recent years, a great interest has been witnessed in the rational design of SERS substrates to amplify Raman signals and optionally allow for the selective detection of analytes, which is especially essential and challenging for biomedical applications. In this study, hard templating of noble metals is proposed as a novel approach for the design of one-component tailor-made SERS platforms. Porous Au microparticles were fabricated via dual ex situ adsorption of Au nanoparticles and in situ reduction of HAuCl4 on mesoporous sacrificial microcrystals of vaterite CaCO3. Elimination of the microcrystals at mild conditions resulted in the formation of stable mesoporous one-component Au microshells. SERS performance of the microshells at very low 0.4 µW laser power was probed using rhodamine B and bovine serum albumin showing enhancement factors of 2 × 108 and 8 × 108, respectively. The proposed strategy opens broad avenues for the design and scalable fabrication of one-component porous metal particles that can serve as superior SERS platforms possessing both excellent plasmonic properties and the possibility of selective inclusion of analyte molecules and/or SERS nanotags for highly specific SERS analysis.

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Language(s): eng - English
 Dates: 2021-10-092021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3390/bios11100380
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Title: Biosensors
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 11 (10) Sequence Number: 380 Start / End Page: - Identifier: ISSN: 2079-6374