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Strobbia P, Sadler T, Odion RA, Vo-Dinh T. SERS in Plain Sight: A Polarization Modulation Method for Signal Extraction. Anal Chem 2019; 91:3319-3326. [PMID: 30676724 DOI: 10.1021/acs.analchem.8b04360] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical spectroscopy offering advantages ranging from "vibrational fingerprints" to multiplexed detection. However, the use of this technique in real-world applications has been limited due to difficulties in detecting inherently weak Raman signals often embedded in strong interfering background signals. A variety of plasmonics-active platforms have been developed to increase Raman signals but are not sufficient to extract weak SERS signals from intense interfering background signals. Herein, we describe a practical method, referred to as polarization modulation-SERS (PM-SERS), which utilizes the polarization dependence of anisotropic SERS-active nanostructures to modulate the plasmonic effect to extract SERS signals and remove background. The modulation is obtained by switching the polarization of the excitation source at a specific frequency involving addition of only few optical components such as liquid crystal polarizers to a typical Raman setup. In this work, we characterized the polarization-dependent response of the SERS substrates fabricated using the oblique angle evaporation (OAV) technique and their response under laser excitation using a polarization modulated source. We demonstrated that the PM-SERS method can extract the analyte weak SERS signals from the strong interfering background signal in different situations, involving a fluorescent sample and a strong background light, and we show the possibility of using PM-SERS at a quasi-real time rate (0.5 Hz). We believe that the PM-SERS method will help expand the translation of applications that utilize SERS-substrates to real-world settings.
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Affiliation(s)
- Pietro Strobbia
- Fitzpatrick Institute for Photonics , Duke University , Durham , North Carolina 27708 , United States.,Department of Biomedical Engineering , Duke University , Durham , North Carolina 27708 , United States
| | - Tyjair Sadler
- Fitzpatrick Institute for Photonics , Duke University , Durham , North Carolina 27708 , United States.,Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
| | - Ren A Odion
- Fitzpatrick Institute for Photonics , Duke University , Durham , North Carolina 27708 , United States.,Department of Biomedical Engineering , Duke University , Durham , North Carolina 27708 , United States
| | - Tuan Vo-Dinh
- Fitzpatrick Institute for Photonics , Duke University , Durham , North Carolina 27708 , United States.,Department of Biomedical Engineering , Duke University , Durham , North Carolina 27708 , United States.,Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
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Macchione MA, Samaniego JE, Moiraghi R, Passarelli N, Macagno VA, Coronado EA, Yacaman MJ, Pérez MA. Gold decoration of silica by decomposition of aqueous gold( iii) hydroxide at low temperatures. RSC Adv 2018; 8:19979-19989. [PMID: 35541634 PMCID: PMC9080740 DOI: 10.1039/c8ra01032c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 05/12/2018] [Indexed: 02/02/2023] Open
Abstract
One-step/one-pot gold decoration of silica driven by gold(iii) hydroxide precipitation/decomposition in wet media avoiding calcination and functionalization.
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Affiliation(s)
- M. A. Macchione
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
| | - J. E. Samaniego
- Centro de Investigación y Estudios Avanzados del IPN unidad Querétaro
- Mexico
- Instituto Politécnico Nacional-CICATA unidad Legaria
- Ciudad de México
- Mexico
| | - R. Moiraghi
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
| | - N. Passarelli
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
| | - V. A. Macagno
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
| | - E. A. Coronado
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
| | - M. J. Yacaman
- Department of Physics & Astronomy
- University of Texas at San Antonio
- (78249) San Antonio
- USA
| | - M. A. Pérez
- Universidad Nacional de Córdoba
- Facultad de Ciencias Químicas
- Departamento de Fisicoquímica
- (X5000HUA) Córdoba
- Argentina
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Farrell ME, Strobbia P, Pellegrino PM, Cullum B. Surface regeneration and signal increase in surface-enhanced Raman scattering substrates. APPLIED OPTICS 2017; 56:B198-B213. [PMID: 28157898 DOI: 10.1364/ao.56.00b198] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Regenerated surface-enhanced Raman scattering (SERS) substrates allow users the ability to not only reuse sensing surfaces, but also tailor them to the sensing application needs (wavelength of the available laser, plasmon band matching). In this review, we discuss the development of SERS substrates for response to emerging threats and some of our collaborative efforts to improve on the use of commercially available substrate surfaces. Thus, we are able to extend the use of these substrates to broader Army needs (like emerging threat response).
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