2
|
Emmons ED, Guicheteau JA, Fountain AW, Tripathi A. Effect of substituents on surface equilibria of thiophenols and isoquinolines on gold substrates studied using surface-enhanced Raman spectroscopy. Phys Chem Chem Phys 2020; 22:15953-15965. [PMID: 32628226 DOI: 10.1039/d0cp01125h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of substituents on the surface adsorption equilibria of thiophenols and isoquinolines on gold substrates was studied using surface-enhanced Raman spectroscopy (SERS) in order to determine the effects of the localized dipole moments and charge donating/withdrawing properties on the binding affinity. Two common classes of molecules used in SERS studies were examined, which included substituted aromatic thiols and nitrogen heterocyclic aromatic molecules (azaarenes), due to their strong affinity for gold surfaces. Unsubstituted thiophenol in aqueous solution binds strongly to gold surfaces. Therefore, it is difficult to measure an equilibrium constant, since even at concentrations of 10-8 M nearly a complete self-assembled monolayer (SAM) forms. In contrast, substituted thiophenols with electron-withdrawing groups, such as halogenated thiophenols, bind much less strongly, allowing equilibrium constants to be obtained. It is believed that the substituent withdrawing charge away from the sulfur atom affects the adsorption/binding between the analyte and surface. Thiophenols substituted with electron donating groups behaved similar to unsubstituted thiophenol, where a SAM was observed at concentrations as low as 10-8 M. These functional groups did not hinder the ability of the sulfur groups to bind with gold. In addition, a series of bromine-substituted isoquinolines, a group of azaarene compounds, were measured to determine the effects that the bromine substituent has when it is bound to the two different rings and if position on the rings has an effect. The azaarene class of molecules, including isoquinoline, adsorbs less strongly than thiophenols, and a dual Langmuir isotherm phenomenon is observed where protonated and neutral bromoisoquinoline molecules occupy two different types of sites on Klarite substrates, which consist of inverted micro-pyramids on Si wafers with rough/nanostructured Au coatings. Protonated isoquinolines bind to nucleophilic sites on the substrates which tend to occur on flatter regions of the substrate. By contrast, neutral isoquinolines bind to electrophilic sites which are predominant near microscopic edges on the substrate. The presence of the bromine substituent and its position in the fused ring structure changes the Gibbs free energies of adsorption, depending on which ring the substituent is in. These results can help to guide the development of SERS for analytical applications by demonstrating how changes in functional groups can affect the equilibrium constants, which are critical for determining the effectiveness of SERS as a tool for trace detection of analytes.
Collapse
Affiliation(s)
- Erik D Emmons
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Jason A Guicheteau
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Augustus W Fountain
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Ashish Tripathi
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| |
Collapse
|
3
|
Xiao B, Rutherford GN, Sharma AP, Pradhan SK, Bonner CE, Bahoura MJ. Surface Modification and Charge Injection in a Nanocomposite Of Metal Nanoparticles and Semiconductor Oxide Nanostructures. Sci Rep 2020; 10:4743. [PMID: 32179756 PMCID: PMC7075916 DOI: 10.1038/s41598-020-58308-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 11/04/2019] [Indexed: 11/24/2022] Open
Abstract
Combining two materials in a nanoscale level can create a composite with new functionalities and improvements in their physical and chemical properties. Here we present a high-throughput approach to produce a nanocomposite consisting of metal nanoparticles and semiconductor oxide nanostructures. Volmer-Weber growth, though unfavorable for thin films, promotes nucleation of dense and isolated metal nanoparticles on crystalline oxide nanostructures, resulting in new material properties. We demonstrate such a growth of Au nanoparticles on SnO2 nanostructures and a remarkable sensitivity of the nanocomposite for detecting traces of analytes in surface enhanced Raman spectroscopy. Au nanoparticles with tunable size enable us to modify surface wettability and convert hydrophilic oxide surfaces into super-hydrophobic with contact angles over 150°. We also find that charge injection through electron beam exposure shows the same effect as photo-induced charge separation, providing an extra Raman enhancement up to an order of magnitude.
Collapse
Affiliation(s)
- Bo Xiao
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US.
| | - Gugu N Rutherford
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US
| | - Amrit P Sharma
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US
| | - Sangram K Pradhan
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US
| | - Carl E Bonner
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US
| | - Messaoud J Bahoura
- Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, US
| |
Collapse
|
4
|
Fornasaro S, Alsamad F, Baia M, Batista de Carvalho LAE, Beleites C, Byrne HJ, Chiadò A, Chis M, Chisanga M, Daniel A, Dybas J, Eppe G, Falgayrac G, Faulds K, Gebavi H, Giorgis F, Goodacre R, Graham D, La Manna P, Laing S, Litti L, Lyng FM, Malek K, Malherbe C, Marques MPM, Meneghetti M, Mitri E, Mohaček-Grošev V, Morasso C, Muhamadali H, Musto P, Novara C, Pannico M, Penel G, Piot O, Rindzevicius T, Rusu EA, Schmidt MS, Sergo V, Sockalingum GD, Untereiner V, Vanna R, Wiercigroch E, Bonifacio A. Surface Enhanced Raman Spectroscopy for Quantitative Analysis: Results of a Large-Scale European Multi-Instrument Interlaboratory Study. Anal Chem 2020; 92:4053-4064. [PMID: 32045217 PMCID: PMC7997108 DOI: 10.1021/acs.analchem.9b05658] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
![]()
Surface-enhanced
Raman scattering (SERS) is a powerful and sensitive
technique for the detection of fingerprint signals of molecules and
for the investigation of a series of surface chemical reactions. Many
studies introduced quantitative applications of SERS in various fields,
and several SERS methods have been implemented for each specific application,
ranging in performance characteristics, analytes used, instruments,
and analytical matrices. In general, very few methods have been validated
according to international guidelines. As a consequence, the application
of SERS in highly regulated environments is still considered risky,
and the perception of a poorly reproducible and insufficiently robust
analytical technique has persistently retarded its routine implementation.
Collaborative trials are a type of interlaboratory study (ILS) frequently
performed to ascertain the quality of a single analytical method.
The idea of an ILS of quantification with SERS arose within the framework
of Working Group 1 (WG1) of the EU COST Action BM1401 Raman4Clinics
in an effort to overcome the problematic perception of quantitative
SERS methods. Here, we report the first interlaboratory SERS study
ever conducted, involving 15 laboratories and 44 researchers. In this
study, we tried to define a methodology to assess the reproducibility
and trueness of a quantitative SERS method and to compare different
methods. In our opinion, this is a first important step toward a “standardization”
process of SERS protocols, not proposed by a single laboratory but
by a larger community.
Collapse
Affiliation(s)
- Stefano Fornasaro
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
| | - Fatima Alsamad
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Monica Baia
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | - Luís A E Batista de Carvalho
- Molecular-Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | | | - Hugh J Byrne
- FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Alessandro Chiadò
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Mihaela Chis
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | - Malama Chisanga
- School of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, United Kingdom M1 7DN
| | - Amuthachelvi Daniel
- Radiation and Environmental Science Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Jakub Dybas
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Gauthier Eppe
- Mass Spectrometry Laboratory (MSLab), MolSys RU, University of Liège, Liège, Belgium
| | - Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI, F-59000 Lille, France
| | - Karen Faulds
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Hrvoje Gebavi
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Rudjer Boskovic Institute, Bijenicka c. 54, 10000 Zagreb, Croatia
| | - Fabrizio Giorgis
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Royston Goodacre
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom, L69 7ZB
| | - Duncan Graham
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Pietro La Manna
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Stacey Laing
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Lucio Litti
- Nanostructures and Optics Laboratory, Department of Chemical Sciences, University of Padova, Via Marzolo 1 - 35131, Padova, Italy
| | - Fiona M Lyng
- Radiation and Environmental Science Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Kamilla Malek
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Cedric Malherbe
- Mass Spectrometry Laboratory (MSLab), MolSys RU, University of Liège, Liège, Belgium
| | - Maria P M Marques
- Molecular-Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.,Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
| | - Moreno Meneghetti
- Nanostructures and Optics Laboratory, Department of Chemical Sciences, University of Padova, Via Marzolo 1 - 35131, Padova, Italy
| | - Elisa Mitri
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
| | - Vlasta Mohaček-Grošev
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Rudjer Boskovic Institute, Bijenicka c. 54, 10000 Zagreb, Croatia
| | - Carlo Morasso
- Nanomedicine and Molecular Imaging Lab, Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, 27100 Pavia, Italy
| | - Howbeer Muhamadali
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom, L69 7ZB
| | - Pellegrino Musto
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Chiara Novara
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Marianna Pannico
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI, F-59000 Lille, France
| | - Olivier Piot
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Tomas Rindzevicius
- Technical University of Denmark, Department of Health Technology, Ørsteds Plads, Building 345C, DK-2800 Kgs. Lyngby, Denmark
| | - Elena A Rusu
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | | | - Valter Sergo
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy.,Faculty of Health Sciences, University of Macau, SAR Macau, China
| | - Ganesh D Sockalingum
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Valérie Untereiner
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Renzo Vanna
- Nanomedicine and Molecular Imaging Lab, Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, 27100 Pavia, Italy
| | - Ewelina Wiercigroch
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Alois Bonifacio
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
| |
Collapse
|