Detection of Surface-Linked Polychlorinated Biphenyls using Surface-Enhanced Raman Scattering Spectroscopy

Tomas Rindzevicius; Jan Barten; Mikhail Vorobiev; Michael Stenbæk Schmidt; John J. Castillo; Anja Boisen

doi:10.1016/j.vibspec.2017.02.004

Detection of Surface-Linked Polychlorinated Biphenyls using Surface-Enhanced Raman Scattering Spectroscopy

Tomas Rindzevicius, Jan Barten, Mikhail Vorobiev, Michael Stenbæk Schmidt, John J. Castillo, Anja Boisen

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Abstract

We present an improved procedure for analytical detection of toxic polychlorinated biphenyls (PCB) using surface-enhanced Raman scattering (SERS) spectroscopy. A gold-capped silicon nanopillar substrate was utilized to concentrate PCB molecules within an area of high electromagnetic fields through formation of microsized nanopillar clusters, and consequently, so-called “hot spots” can be formed. In order to improve PCB detection limit, 3,3',4,4'-tetrachlorobiphenyl (PCB77) compounds were chemically modified with a –
SCH3 (PCB77-SCH₃) group. Experimental and numerical analysis of vibrational modes showed only minor differences between standard PCB77 and PCB77-SCH₃. Consequently, we observe significantly increased SERS signals for –SCH3 modified PCB77 while retaining most vibrational modes that characterize standard PCB77. Results point towards more efficient path for detecting different PCB congeners from real-life samples. We interpret the result as PCB77-SCH₃ link to gold surface via sulfur atoms that facilitates accumulation of the modified PCB molecules on the metal surface. For similar SERS experimental conditions most spectral characteristics of PCB77 are identifiable down to concentrations of ~10-5 M while PCB77-SCH₃ spectral fingerprint is retained in ~10-8 M range.

Original language	English
Journal	Vibrational Spectroscopy
Volume	90
Pages (from-to)	1-6
Number of pages	6
ISSN	0924-2031
DOIs	https://doi.org/10.1016/j.vibspec.2017.02.004
Publication status	Published - 2017

Keywords

Polychlorinated biphenyls
PCB
Toxic molecules
Surface-enchanced Raman scattering
SERS detection
Hot spots
Gold nanopillars

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10.1016/j.vibspec.2017.02.004

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@article{3a34e2c3aa6e4d94bba51d1edcd04a8d,

title = "Detection of Surface-Linked Polychlorinated Biphenyls using Surface-Enhanced Raman Scattering Spectroscopy",

abstract = "We present an improved procedure for analytical detection of toxic polychlorinated biphenyls (PCB) using surface-enhanced Raman scattering (SERS) spectroscopy. A gold-capped silicon nanopillar substrate was utilized to concentrate PCB molecules within an area of high electromagnetic fields through formation of microsized nanopillar clusters, and consequently, so-called “hot spots” can be formed. In order to improve PCB detection limit, 3,3',4,4'-tetrachlorobiphenyl (PCB77) compounds were chemically modified with a –SCH3 (PCB77-SCH3) group. Experimental and numerical analysis of vibrational modes showed only minor differences between standard PCB77 and PCB77-SCH3. Consequently, we observe significantly increased SERS signals for –SCH3 modified PCB77 while retaining most vibrational modes that characterize standard PCB77. Results point towards more efficient path for detecting different PCB congeners from real-life samples. We interpret the result as PCB77-SCH3 link to gold surface via sulfur atoms that facilitates accumulation of the modified PCB molecules on the metal surface. For similar SERS experimental conditions most spectral characteristics of PCB77 are identifiable down to concentrations of ~10-5 M while PCB77-SCH3 spectral fingerprint is retained in ~10-8 M range.",

keywords = "Polychlorinated biphenyls, PCB, Toxic molecules, Surface-enchanced Raman scattering, SERS detection, Hot spots, Gold nanopillars",

author = "Tomas Rindzevicius and Jan Barten and Mikhail Vorobiev and Schmidt, {Michael Stenb{\ae}k} and Castillo, {John J.} and Anja Boisen",

year = "2017",

doi = "10.1016/j.vibspec.2017.02.004",

language = "English",

volume = "90",

pages = "1--6",

journal = "Vibrational Spectroscopy",

issn = "0924-2031",

publisher = "Elsevier",

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TY - JOUR

T1 - Detection of Surface-Linked Polychlorinated Biphenyls using Surface-Enhanced Raman Scattering Spectroscopy

AU - Rindzevicius, Tomas

AU - Barten, Jan

AU - Vorobiev, Mikhail

AU - Schmidt, Michael Stenbæk

AU - Castillo, John J.

AU - Boisen, Anja

PY - 2017

Y1 - 2017

N2 - We present an improved procedure for analytical detection of toxic polychlorinated biphenyls (PCB) using surface-enhanced Raman scattering (SERS) spectroscopy. A gold-capped silicon nanopillar substrate was utilized to concentrate PCB molecules within an area of high electromagnetic fields through formation of microsized nanopillar clusters, and consequently, so-called “hot spots” can be formed. In order to improve PCB detection limit, 3,3',4,4'-tetrachlorobiphenyl (PCB77) compounds were chemically modified with a –SCH3 (PCB77-SCH3) group. Experimental and numerical analysis of vibrational modes showed only minor differences between standard PCB77 and PCB77-SCH3. Consequently, we observe significantly increased SERS signals for –SCH3 modified PCB77 while retaining most vibrational modes that characterize standard PCB77. Results point towards more efficient path for detecting different PCB congeners from real-life samples. We interpret the result as PCB77-SCH3 link to gold surface via sulfur atoms that facilitates accumulation of the modified PCB molecules on the metal surface. For similar SERS experimental conditions most spectral characteristics of PCB77 are identifiable down to concentrations of ~10-5 M while PCB77-SCH3 spectral fingerprint is retained in ~10-8 M range.

AB - We present an improved procedure for analytical detection of toxic polychlorinated biphenyls (PCB) using surface-enhanced Raman scattering (SERS) spectroscopy. A gold-capped silicon nanopillar substrate was utilized to concentrate PCB molecules within an area of high electromagnetic fields through formation of microsized nanopillar clusters, and consequently, so-called “hot spots” can be formed. In order to improve PCB detection limit, 3,3',4,4'-tetrachlorobiphenyl (PCB77) compounds were chemically modified with a –SCH3 (PCB77-SCH3) group. Experimental and numerical analysis of vibrational modes showed only minor differences between standard PCB77 and PCB77-SCH3. Consequently, we observe significantly increased SERS signals for –SCH3 modified PCB77 while retaining most vibrational modes that characterize standard PCB77. Results point towards more efficient path for detecting different PCB congeners from real-life samples. We interpret the result as PCB77-SCH3 link to gold surface via sulfur atoms that facilitates accumulation of the modified PCB molecules on the metal surface. For similar SERS experimental conditions most spectral characteristics of PCB77 are identifiable down to concentrations of ~10-5 M while PCB77-SCH3 spectral fingerprint is retained in ~10-8 M range.

KW - Polychlorinated biphenyls

KW - PCB

KW - Toxic molecules

KW - Surface-enchanced Raman scattering

KW - SERS detection

KW - Hot spots

KW - Gold nanopillars

U2 - 10.1016/j.vibspec.2017.02.004

DO - 10.1016/j.vibspec.2017.02.004

M3 - Journal article

SN - 0924-2031

VL - 90

SP - 1

EP - 6

JO - Vibrational Spectroscopy

JF - Vibrational Spectroscopy

ER -

Detection of Surface-Linked Polychlorinated Biphenyls using Surface-Enhanced Raman Scattering Spectroscopy

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Keywords

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