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Lafitte M, Dwivedi R, Elancheliyan R, Lagugné-Labarthet F, Buisson L, Ly I, Barois P, Baron A, Mondain-Monval O, Ponsinet V. Colloidal Self-Assembly of Silver Nanoparticle Clusters for Optical Metasurfaces. Langmuir 2024; 40:2601-2615. [PMID: 38279929 DOI: 10.1021/acs.langmuir.3c02900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2024]
Abstract
Optical metasurfaces are two-dimensional assemblies of nanoscale optical resonators and could constitute the next generation of ultrathin optical components. The development of methods to manufacture these nanostructures on a large scale is still a challenge, while most performance demonstrations were obtained with lithographically fabricated metasurfaces that are restricted to small scales. Self-assembly fabrication routes are promising alternatives and have been used to produce original nanoresonators. Reports of self-assembled metasurface fabrication, however, are still scarce. Here, we show that an emulsion-based formulation approach can be used both for the fabrication of complex colloidal resonators, presenting a strong interaction with light, in particular due to simultaneous magnetic and electric modes of resonance, and for their deposition in homogeneous films. This fabrication technique involves emulsification of an aqueous suspension of silver nanoparticles in an oil phase, followed by controlled drying of the emulsion, and produces silver colloidal clusters. We show that the drying process can be controlled in a liquid emulsion, producing a metafluid, as well as in a sedimented emulsion, producing a metasurface. The structural control of the synthesized colloidal clusters is demonstrated with electron microscopy and X-ray scattering techniques. Using a polarization-resolved multiangle light scattering setup in the visible wavelength range, we conduct a comprehensive angular and spectroscopic study of the optical resonant scattering of the nanoresonators in a metafluid and show that they present strong optical magnetic resonances and directional forward-scattering patterns, with scattering efficiencies of up to 4. The metasurfaces consist of homogeneous films, of variable surface density, of colloidal clusters that have the same extinction properties on the surface and in the fluid. This experimental approach allows for large-scale production of metasurfaces.
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Affiliation(s)
- Maeva Lafitte
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
| | - Ranjeet Dwivedi
- ENSEMBLE3 Centre of Excellence, Wolczynska 133, Warsaw 01-919, Poland
| | - Rajam Elancheliyan
- Laboratoire Charles Coulomb, UMR 5221, CNRS-Université de Montpellier, Montpellier F-34095, France
| | - François Lagugné-Labarthet
- Department of Chemistry, The University of Western Ontario (Western University), London, Ontario N6A 5B7, Canada
| | - Lionel Buisson
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
| | - Isabelle Ly
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
| | - Philippe Barois
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
| | - Alexandre Baron
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
- Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France
| | - Olivier Mondain-Monval
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
| | - Virginie Ponsinet
- Centre de Recherche Paul Pascal, UMR 5031, Univ. Bordeaux and CNRS, Pessac F-33600, France
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Veliz L, Cooper TT, Grenier-Pleau I, Abraham SA, Gomes J, Pasternak SH, Dauber B, Postovit LM, Lajoie GA, Lagugné-Labarthet F. Tandem SERS and MS/MS Profiling of Plasma Extracellular Vesicles for Early Ovarian Cancer Biomarker Discovery. ACS Sens 2024; 9:272-282. [PMID: 38214491 DOI: 10.1021/acssensors.3c01908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Extracellular vesicles (EVs) are vectors of biomolecular cargo that play essential roles in intercellular communication across a range of cells. Protein, lipid, and nucleic acid cargo harbored within EVs may serve as biomarkers at all stages of disease; however, the choice of methodology may challenge the specificity and reproducibility of discovery. To address these challenges, the integration of rigorous EV purification methods, cutting-edge spectroscopic technologies, and data analysis are critical to uncover diagnostic signatures of disease. Herein, we demonstrate an EV isolation and analysis pipeline using surface-enhanced Raman spectroscopy (SERS) and mass spectrometry (MS) techniques on plasma samples obtained from umbilical cord blood, healthy donor (HD) plasma, and plasma from women with early stage high-grade serous carcinoma (HGSC). Plasma EVs were purified by size exclusion chromatography and analyzed by surface-enhanced Raman spectroscopy (SERS), mass spectrometry (MS), and atomic force microscopy. After determining the fraction of highest EV purity, SERS and MS were used to characterize EVs from HDs, pooled donors with noncancerous gynecological ailments (n = 6), and donors with early stage [FIGO (I/II)] with HGSC. SERS spectra were subjected to different machine learning algorithms such as PCA, logistic regression, support vector machine, naïve Bayes, random forest, neural network, and k nearest neighbors to differentiate healthy, benign, and HGSC EVs. Collectively, we demonstrate a reproducible workflow with the potential to serve as a diagnostic platform for HGSC.
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Affiliation(s)
- Lorena Veliz
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Tyler T Cooper
- Department of Biomedical and Molecular Sciences, Queen's University, 99 University Avenue, Kingston, Ontario K7L 3N6, Canada
- Department of Biochemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Isabelle Grenier-Pleau
- Department of Biomedical and Molecular Sciences, Queen's University, 99 University Avenue, Kingston, Ontario K7L 3N6, Canada
| | - Sheela A Abraham
- Department of Biomedical and Molecular Sciences, Queen's University, 99 University Avenue, Kingston, Ontario K7L 3N6, Canada
| | - Janice Gomes
- Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K5, Canada
| | - Stephen H Pasternak
- Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K5, Canada
| | - Bianca Dauber
- Department of Biomedical and Molecular Sciences, Queen's University, 99 University Avenue, Kingston, Ontario K7L 3N6, Canada
| | - Lynne M Postovit
- Department of Biomedical and Molecular Sciences, Queen's University, 99 University Avenue, Kingston, Ontario K7L 3N6, Canada
| | - Gilles A Lajoie
- Department of Biochemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
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3
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Boersma PJ, Lagugné-Labarthet F, McDowell T, Macfie SM. Silver nanoparticles inhibit nitrogen fixation in soybean (Glycine max) root nodules. Environ Sci Pollut Res Int 2023; 30:32014-32031. [PMID: 36456673 DOI: 10.1007/s11356-022-24446-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Antimicrobial silver nanoparticles (AgNPs) are popular in consumer and industrial products, leading to increasing concentrations in the environment. We tested whether exposure to AgNPs could be detrimental to a microbe, its host plant, and their symbiotic relationship. When subjected to 10 µg/mL AgNPs, growth of Bradyrhizobium japonicum USDA 110 was halted. Axenic nitrogen-fertilized Glycine max seedlings were unaffected by 2.5 µg/mL of 30 nm AgNPs, but growth was inhibited with the same dose of 16 nm AgNPs. With 2.5 µg/mL AgNPs, biomass of inoculated plants was 50% of the control. Bacteroids were not found in nodules on plants treated with 2.5 µg/mL AgNPs and plants given 0.5-2.5 µg/mL AgNPs had 40-65% decreased nitrogen fixation. In conclusion, AgNPs not only interfere with general plant and bacterial growth but also inhibit nodule development and bacterial nitrogen fixation. We should be mindful of not releasing AgNPs to the environment or to agricultural land.
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Affiliation(s)
- Paul J Boersma
- Department of Biology, University of Western Ontario, London, ON, N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, University of Western Ontario, London, ON, N6A 3K7, Canada
- Centre for Advanced Material and Biomaterial Research (CAMBR), University of Western Ontario, London, ON, N6A 3K7, Canada
| | - Tim McDowell
- London Research and Development Centre, Agriculture and Agri-Food Canada, 1391 Sandford St., London, ON, N5V 4T3, Canada
| | - Sheila M Macfie
- Department of Biology, University of Western Ontario, London, ON, N6A 5B7, Canada.
- Centre for Advanced Material and Biomaterial Research (CAMBR), University of Western Ontario, London, ON, N6A 3K7, Canada.
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Avilés MO, Jelken J, Lagugné-Labarthet F. Periodic Spiral Ripples on VS 2 Flakes: A Tip-Enhanced Raman Investigation. J Phys Chem Lett 2022; 13:9771-9776. [PMID: 36226836 DOI: 10.1021/acs.jpclett.2c02555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Using atmospheric-pressure chemical vapor deposition, we have synthesized vanadium disulfide (VS2) flakes with a metallic 1T phase that display nanoscale spiral surface ripples. To understand the origin of these chiral patterns in these transition metal dichalcogenides, tip-enhanced Raman spectroscopy and Kelvin probe force microscopies were jointly used to investigate their crystal structure, possible oxidation, and electronic properties, respectively. We found that the surface corrugation consists of small crystalline domains with distinct orientations. The change in local orientation is observed concomitantly with a spectral shift of the lattice modes of VS2 and results in the formation of grain boundaries between the domains with distinct orientation. Additionally, the periodic surface structure is modulating the work function of VS2 by 14 meV.
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Affiliation(s)
- María Olivia Avilés
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
| | - Joachim Jelken
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
| | - François Lagugné-Labarthet
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
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5
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Jelken J, Avilés MO, Lagugné-Labarthet F. The Hidden Flower in WS 2 Flakes: A Combined Nanomechanical and Tip-Enhanced Raman Exploration. ACS Nano 2022; 16:12352-12363. [PMID: 35876460 DOI: 10.1021/acsnano.2c03441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We report on tungsten disulfide (WS2) flakes grown by chemical vapor deposition (CVD), which exhibit a flower-like surface structure above the primary few-layer flake with a triangular shape. The fine structure is only revealed in the mechanical, chemical, and electronic properties of the flake but not in the topography. The origin of this structure is the peculiar one-step growth during the CVD process that permits to control the sulfur concentration at any time. A high concentration of S at the onset of the deposition process leads to a rapid growth of the flake, resulting in tungsten vacancies. Reducing the sulfur concentration toward the end of the growth slows down the reaction and leads to sulfur vacancies. These microscale domains were studied by confocal- and tip-enhanced Raman spectroscopy revealing their chemical composition with high spatial resolution. A strong quenching of the photoluminescence in the tungsten-vacancy domains is observed. Atomic force microscope measurements, performed in intermittent contact mode, force modulation mode (including lateral force mode), and PeakForce quantitative nanomechanics mode, show that the mechanical properties of these domains differ. Within the tungsten-vacancy domains, the adhesion force is reduced, while the friction force increased. Kelvin probe force microscopy measurements show that the electronic properties of the flakes are modulated by these domains. The combined nanomechanical and nanospectroscopy measurements provide detailed insights on the inhomogeneous surface properties of the single WS2 flake, further highlighting how its multidomain properties can be finely tuned using CVD.
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Affiliation(s)
- Joachim Jelken
- The Centre for Advanced Materials and Biomaterials Research (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - María O Avilés
- The Centre for Advanced Materials and Biomaterials Research (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - François Lagugné-Labarthet
- The Centre for Advanced Materials and Biomaterials Research (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), 1151 Richmond Street, London, Ontario N6A 5B7, Canada
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6
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Mazaheri L, Jelken J, Avilés MO, Legge S, Lagugné-Labarthet F. Investigating the Performances of Wide-Field Raman Microscopy with Stochastic Optical Reconstruction Post-Processing. Appl Spectrosc 2022; 76:340-351. [PMID: 35128956 PMCID: PMC8915227 DOI: 10.1177/00037028211056975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 10/07/2021] [Indexed: 05/25/2023]
Abstract
Super-resolution fluorescence microscopy based on localization algorithms has tremendously impacted the field of imaging by improving the spatial resolution of optical measurements with specific blinking fluorophores and concomitant reduction of acquisition time. In vibrational spectroscopy and imaging, various methods have been developed to surpass the diffraction limit including near-field scattering methods, such as in tip-enhanced Raman and infrared spectroscopies. Although these scanning-probe techniques can provide exquisite spatial resolution, they often require long acquisition times and tedious fabrication of nano-scale scanning probes. Herein, stochastic optical reconstruction microscopy (STORM) protocol is applied on Raman measurements acquired using a wide-field home-built microscopy setup. We explore how the fluctuations of the Raman signal acquired over a series of time-lapse images at specific spectral ranges can be exploited with STORM processing, possibly revealing details with improved spatial resolution, under lower irradiance and with faster acquisition speed that cannot be achieved in point scanning mode over the same field of view. Samples studied here include patterned silicon, polystyrene microspheres on a silicon wafer, and graphene on a silicon/silicon dioxide substrate. The outcome presents an effective way to collect Raman images at selected spectral ranges with spatial resolutions of ∼200 nm over a large field of view under 532 nm excitation together with an acquisition speed improved by two orders of magnitude and under a significantly reduced irradiance compared to confocal laser scanning acquisition.
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Affiliation(s)
| | | | | | | | - François Lagugné-Labarthet
- François Lagugné-Labarthet, Department of Chemistry, The Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario (Western University), 1151 Richmond St., London, ON N6A 5B7, Canada.
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7
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Ćulum NM, Cooper TT, Lajoie GA, Dayarathna T, Pasternak SH, Liu J, Fu Y, Postovit LM, Lagugné-Labarthet F. Characterization of ovarian cancer-derived extracellular vesicles by surface-enhanced Raman spectroscopy. Analyst 2021; 146:7194-7206. [PMID: 34714898 DOI: 10.1039/d1an01586a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Ovarian cancer is the most lethal gynecological malignancy, owing to the fact that most cases are diagnosed at a late stage. To improve prognosis and reduce mortality, we must develop methods for the early diagnosis of ovarian cancer. A step towards early and non-invasive cancer diagnosis is through the utilization of extracellular vesicles (EVs), which are nanoscale, membrane-bound vesicles that contain proteins and genetic material reflective of their parent cell. Thus, EVs secreted by cancer cells can be thought of as cancer biomarkers. In this paper, we present gold nanohole arrays for the capture of ovarian cancer (OvCa)-derived EVs and their characterization by surface-enhanced Raman spectroscopy (SERS). For the first time, we have characterized EVs isolated from two established OvCa cell lines (OV-90, OVCAR3), two primary OvCa cell lines (EOC6, EOC18), and one human immortalized ovarian surface epithelial cell line (hIOSE) by SERS. We subsequently determined their main compositional differences by principal component analysis and were able to discriminate the groups by a logistic regression-based machine learning method with ∼99% accuracy, sensitivity, and specificity. The results presented here are a great step towards quick, facile, and non-invasive cancer diagnosis.
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Affiliation(s)
- Nina M Ćulum
- University of Western Ontario (Western University), Department of Chemistry, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.
| | - Tyler T Cooper
- University of Western Ontario (Western University), Department of Biochemistry, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Gilles A Lajoie
- University of Western Ontario (Western University), Department of Biochemistry, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Thamara Dayarathna
- University of Western Ontario (Western University), Robarts Research Institute, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Stephen H Pasternak
- University of Western Ontario (Western University), Robarts Research Institute, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Jiahui Liu
- University of Alberta, Department of Oncology, 116 St. & 85 Ave., Edmonton, Alberta, T6G 2R3, Canada
| | - Yangxin Fu
- University of Alberta, Department of Oncology, 116 St. & 85 Ave., Edmonton, Alberta, T6G 2R3, Canada
| | - Lynne-Marie Postovit
- University of Alberta, Department of Oncology, 116 St. & 85 Ave., Edmonton, Alberta, T6G 2R3, Canada.,Queen's University, Department of Biomedical & Molecular Sciences, 99 University Ave., Kingston, Ontario, K2L 3N6, Canada
| | - François Lagugné-Labarthet
- University of Western Ontario (Western University), Department of Chemistry, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.
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Kherbouche I, McRae DM, Jourdain TG, Lagugné-Labarthet F, Lamouri A, Biraud AC, Mangeney C, Félidj N. Correction: Extending nanoscale patterning with multipolar surface plasmon resonances. Nanoscale 2021; 13:13905. [PMID: 34477664 DOI: 10.1039/d1nr90167b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Correction for 'Extending nanoscale patterning with multipolar surface plasmon resonances' by Issam Kherbouche et al., Nanoscale, 2021, 13, 11051-11057, DOI: .
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Affiliation(s)
- Issam Kherbouche
- Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France.
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9
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Kherbouche I, MacRae D, Geronimi Jourdain T, Lagugné-Labarthet F, Lamouri A, Chevillot Biraud A, Mangeney C, Félidj N. Extending nanoscale patterning with multipolar surface plasmon resonances. Nanoscale 2021; 13:11051-11057. [PMID: 34080604 DOI: 10.1039/d1nr02181h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Plasmonic excitation of metallic nanoparticles can trigger chemical reactions at the nanoscale. Such optical effects can also be employed to selectively and locally graft photopolymer layers at the nanostructure surface, and, when combined with a surface functionalization agent, new pathways can be explored to modify the surface of a plasmonic nanoparticle. Among these approaches, diazonium salt chemistry is seen as an attractive strategy due to the high photoinduced reactivity of these salts. In this work, we demonstrate that it is possible to trigger the site-selective grafting of aryl films derived from diazonium salts on distinct nano-localized area of single gold nanotriangles, by taking advantage of their multipolar localized surface plasmon modes. It is shown the aryl film will preferentially graft in areas where the electric field enhancement is maximum, independently of the considered excited surface plasmon mode. These experimental findings are in very good qualitative agreement with the calculations of the local electric field, using the finite-difference time-domain (FDTD) method. We believe that this plasmonic-based approach will not only pave a new way for the spatially controlled surface functionalization of plasmonic nanoparticles, but also provide a general strategy to attach distinct molecules to hot spot regions on a single nanoparticle, opening promising prospects in sensing and multiplexing, and optically nano-scale patterning of functional groups.
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Affiliation(s)
- Issam Kherbouche
- Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France. and UFR Biomedicale, UMR 8601 Université Paris Descartes Sorbonne Paris Cite, 45 Rue des Saint Péres, 70005 Paris, France
| | - Danielle MacRae
- Department of Chemistry, University of Western Ontario, 1151 Richmond St, London, Ontario N6A 5B7, Canada
| | | | - François Lagugné-Labarthet
- Department of Chemistry, University of Western Ontario, 1151 Richmond St, London, Ontario N6A 5B7, Canada
| | - Azedine Lamouri
- Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France.
| | | | - Claire Mangeney
- Université de Paris, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, LCBPT, UMR 8601 CNRS, F-75006 Paris, France.
| | - Nordin Félidj
- Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France.
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Ćulum NM, Cooper TT, Bell GI, Hess DA, Lagugné-Labarthet F. Characterization of extracellular vesicles derived from mesenchymal stromal cells by surface-enhanced Raman spectroscopy. Anal Bioanal Chem 2021; 413:5013-5024. [PMID: 34137912 DOI: 10.1007/s00216-021-03464-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/02/2021] [Accepted: 06/08/2021] [Indexed: 12/18/2022]
Abstract
Extracellular vesicles (EVs) are secreted by all cells into bodily fluids and play an important role in intercellular communication through the transfer of proteins and RNA. There is evidence that EVs specifically released from mesenchymal stromal cells (MSCs) are potent cell-free regenerative agents. However, for MSC EVs to be used in therapeutic practices, there must be a standardized and reproducible method for their characterization. The detection and characterization of EVs are a challenge due to their nanoscale size as well as their molecular heterogeneity. To address this challenge, we have fabricated gold nanohole arrays of varying sizes and shapes by electron beam lithography. These platforms have the dual purpose of trapping single EVs and enhancing their vibrational signature in surface-enhanced Raman spectroscopy (SERS). In this paper, we report SERS spectra for MSC EVs derived from pancreatic tissue (Panc-MSC) and bone marrow (BM-MSC). Using principal component analysis (PCA), we determined that the main compositional differences between these two groups are found at 1236, 761, and 1528 cm-1, corresponding to amide III, tryptophan, and an in-plane -C=C- vibration, respectively. We additionally explored several machine learning approaches to distinguish between BM- and Panc-MSC EVs and achieved 89 % accuracy, 89 % sensitivity, and 88 % specificity using logistic regression.
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Affiliation(s)
- Nina M Ćulum
- Department of Chemistry, Centre for Advanced Materials and Biomaterials Research (CAMBR), University of Western Ontario (Western University), 1151 Richmond St, London, Ontario, N6A 5B7, Canada
| | - Tyler T Cooper
- Robarts Research Institute, Department of Physiology and Pharmacology, Schulich School of medicine and Dentistry, University of Western Ontario (Western University), 1151 Richmond St, London, Ontario, N6A 5B7, Canada
| | - Gillian I Bell
- Robarts Research Institute, Department of Physiology and Pharmacology, Schulich School of medicine and Dentistry, University of Western Ontario (Western University), 1151 Richmond St, London, Ontario, N6A 5B7, Canada
| | - David A Hess
- Robarts Research Institute, Department of Physiology and Pharmacology, Schulich School of medicine and Dentistry, University of Western Ontario (Western University), 1151 Richmond St, London, Ontario, N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, Centre for Advanced Materials and Biomaterials Research (CAMBR), University of Western Ontario (Western University), 1151 Richmond St, London, Ontario, N6A 5B7, Canada.
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11
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Therien DAB, McRae DM, Mangeney C, Félidj N, Lagugné-Labarthet F. Three-color plasmon-mediated reduction of diazonium salts over metasurfaces. Nanoscale Adv 2021; 3:2501-2507. [PMID: 36134146 PMCID: PMC9417294 DOI: 10.1039/d0na00862a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/20/2021] [Indexed: 06/14/2023]
Abstract
Surface plasmon-mediated chemical reactions are of great interest for a variety of applications ranging from micro- and nanoscale device fabrication to chemical reactions of societal interest for hydrogen production or carbon reduction. In this work, a crosshair-like nanostructure is investigated due to its ability to induce local enhancement of the local electromagnetic field at three distinct wavelengths corresponding to three plasmon resonances. The structures are irradiated in the presence of a solution containing diazonium salts at wavelengths that match the resonance positions at 532 nm, 632.8 nm, and 800 nm. The resulting grafting shows polarization and wavelength-dependent growth patterns at the nanoscale. The plasmon-mediated reactions over arrays of the crosshair structures are further investigated using scanning electron microscopy and supported by finite domain time domain modelling revealing wavelength and polarization specific reactions. Such an approach enables nanoscale molecular printing using light source opening multiplexing applications where different analytes can be grafted under distinct opto-geometric conditions.
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Affiliation(s)
- Denis A B Therien
- Department of Chemistry, University of Western Ontario 1151 Richmond Street London ON N6A 5B7 Canada
| | - Danielle M McRae
- Department of Chemistry, University of Western Ontario 1151 Richmond Street London ON N6A 5B7 Canada
| | - Claire Mangeney
- Université de Paris, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, LCBPT, UMR 8601 CNRS 45 rue des Saints Péres F-75006 Paris France
| | - Nordin Félidj
- Université de Paris, ITODYS, UMR 7086 CNRS 15 rue J.-A. de Baïf F-75013 Paris France
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12
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Cooper TT, Sherman SE, Bell GI, Dayarathna T, McRae DM, Ma J, Lagugné-Labarthet F, Pasternak SH, Lajoie GA, Hess DA. Ultrafiltration and Injection of Islet Regenerative Stimuli Secreted by Pancreatic Mesenchymal Stromal Cells. Stem Cells Dev 2021; 30:247-264. [PMID: 33403929 PMCID: PMC10331161 DOI: 10.1089/scd.2020.0206] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 01/04/2021] [Indexed: 12/13/2022] Open
Abstract
The secretome of mesenchymal stromal cells (MSCs) is enriched for biotherapeutic effectors contained within and independent of extracellular vesicles (EVs) that may support tissue regeneration as an injectable agent. We have demonstrated that the intrapancreatic injection of concentrated conditioned media (CM) produced by bone marrow MSC supports islet regeneration and restored glycemic control in hyperglycemic mice, ultimately providing a platform to elucidate components of the MSC secretome. Herein, we extend these findings using human pancreas-derived MSC (Panc-MSC) as "biofactories" to enrich for tissue regenerative stimuli housed within distinct compartments of the secretome. Specifically, we utilized 100 kDa ultrafiltration as a simple method to debulk protein mass and to enrich for EVs while concentrating the MSC secretome into an injectable volume for preclinical assessments in murine models of blood vessel and islet regeneration. EV enrichment (EV+) was validated using nanoscale flow cytometry and atomic force microscopy, in addition to the detection of classical EV markers CD9, CD81, and CD63 using label-free mass spectrometry. EV+ CM was predominately enriched with mediators of wound healing and epithelial-to-mesenchymal transition that supported functional regeneration in mesenchymal and nonmesenchymal tissues. For example, EV+ CM supported human microvascular endothelial cell tubule formation in vitro and enhanced the recovery of blood perfusion following intramuscular injection in nonobese diabetic/severe combined immunodeficiency mice with unilateral hind limb ischemia. Furthermore, EV+ CM increased islet number and β cell mass, elevated circulating insulin, and improved glycemic control following intrapancreatic injection in streptozotocin-treated mice. Collectively, this study provides foundational evidence that Panc-MSC, readily propagated from the subculture of human islets, may be utilized for regenerative medicine applications.
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Affiliation(s)
- Tyler T. Cooper
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | - Stephen E. Sherman
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Gillian I. Bell
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Thamara Dayarathna
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | | | - Jun Ma
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | | | - Stephen H. Pasternak
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Gilles A. Lajoie
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | - David A. Hess
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
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13
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Kajendirarajah U, Olivia Avilés M, Lagugné-Labarthet F. Deciphering tip-enhanced Raman imaging of carbon nanotubes with deep learning neural networks. Phys Chem Chem Phys 2020; 22:17857-17866. [PMID: 32761045 DOI: 10.1039/d0cp02950e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent release of open-source machine learning libraries presents opportunities to unify machine learning with nanoscale research, thus improving effectiveness of research methods and characterization protocols. This paper outlines and demonstrates the effectiveness of such a synergy with artificial neural networks to provide for an accelerated and enhanced characterization of individual carbon nanotubes deposited over a surface. Our algorithms provide a rapid diagnosis and analysis of tip-enhanced Raman spectroscopy mappings and the results show an improved spectral assignment of spectral features and spatial contrast of the collected images. Using several examples, we demonstrate the robustness and versatility of our deep learning neural network models. We highlight the use of machine learning and data science in tandem with tip-enhanced Raman spectroscopy technique enables a fast and accurate understanding of experimental data, thus leading to a powerful and comprehensive imaging analysis applied to spectroscopic measurements.
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Affiliation(s)
- Usant Kajendirarajah
- The University of Western Ontario (Western University), Department of Chemistry, 1151 Richmond Street, London, On N6A 5B7, Canada.
| | - María Olivia Avilés
- The University of Western Ontario (Western University), Department of Chemistry, 1151 Richmond Street, London, On N6A 5B7, Canada.
| | - François Lagugné-Labarthet
- The University of Western Ontario (Western University), Department of Chemistry, 1151 Richmond Street, London, On N6A 5B7, Canada.
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14
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Villamagna IJ, McRae DM, Borecki A, Mei X, Lagugné-Labarthet F, Beier F, Gillies ER. GSK3787-Loaded Poly(Ester Amide) Particles for Intra-Articular Drug Delivery. Polymers (Basel) 2020; 12:E736. [PMID: 32224867 PMCID: PMC7240550 DOI: 10.3390/polym12040736] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/16/2020] [Accepted: 03/16/2020] [Indexed: 01/04/2023] Open
Abstract
Osteoarthritis (OA) is a debilitating joint disorder affecting more than 240 million people. There is no disease modifying therapeutic, and drugs that are used to alleviate OA symptoms result in side effects. Recent research indicates that inhibition of peroxisome proliferator-activated receptor δ (PPARδ) in cartilage may attenuate the development or progression of OA. PPARδ antagonists such as GSK3787 exist, but would benefit from delivery to joints to avoid side effects. Described here is the loading of GSK3787 into poly(ester amide) (PEA) particles. The particles contained 8 wt.% drug and had mean diameters of about 600 nm. Differential scanning calorimetry indicated the drug was in crystalline domains in the particles. Atomic force microscopy was used to measure the Young's moduli of individual particles as 2.8 MPa. In vitro drug release studies showed 11% GSK3787 was released over 30 days. Studies in immature murine articular cartilage (IMAC) cells indicated low toxicity from the drug, empty particles, and drug-loaded particles and that the particles were not taken up by the cells. Ex vivo studies on murine joints showed that the particles could be injected into the joint space and resided there for at least 7 days. Overall, these results indicate that GSK3787-loaded PEA particles warrant further investigation as a delivery system for potential OA therapy.
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Affiliation(s)
- Ian J. Villamagna
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
| | - Danielle M. McRae
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Aneta Borecki
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Xueli Mei
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - François Lagugné-Labarthet
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Frank Beier
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 3B7, Canada
| | - Elizabeth R. Gillies
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
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15
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Abstract
In this work, we present a clean one-step process for modifying headgroups of self-assembled monolayers (SAMs) on gold using photo-enabled click chemistry. A thiolated, cyclopropenone-caged strained alkyne precursor was first functionalized onto a flat gold substrate through self-assembly. Exposure of the cyclopropenone SAM to UVA light initiated the efficient photochemical decarbonylation of the cyclopropenone moiety, revealing the strained alkyne capable of undergoing the interfacial strain-promoted alkyne-azide cycloaddition (SPAAC). Irradiated SAMs were derivatized with a series of model azides with varied hydrophobicity to demonstrate the generality of this chemical system for the modification and fine-tuning of the surface chemistry on gold substrates. SAMs were characterized at each step with polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) to confirm the successful functionalization and reactivity. Furthermore, to showcase the compatibility of this approach with biochemical applications, cyclopropenone SAMs were irradiated and modified with azide-bearing cell adhesion peptides to promote human fibroblast cell adhesion, and then imaged by live-cell fluorescence microscopy. Thus, the "photoclick" methodology reported here represents an improved, versatile, catalyst-free protocol that allows for a high degree of control over the modification of material surfaces, with applicability in materials science as well as biochemistry.
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Affiliation(s)
- Wilson Luo
- Department of Chemistry and the Centre for Materials and Biomaterials Research , Western University , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Sydney M Legge
- Department of Chemistry and the Centre for Materials and Biomaterials Research , Western University , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Johnny Luo
- Department of Biochemistry , Western University , London , Ontario N6A 5C1 , Canada
- Lawson Health Research Institute , London , Ontario N6C 2R5 , Canada
| | - François Lagugné-Labarthet
- Department of Chemistry and the Centre for Materials and Biomaterials Research , Western University , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Mark S Workentin
- Department of Chemistry and the Centre for Materials and Biomaterials Research , Western University , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
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16
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Affiliation(s)
- Danielle M McRae
- Department of Chemistry, The University of Western Ontario (Western University), London, Ontario, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, The University of Western Ontario (Western University), London, Ontario, Canada.
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17
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Wallace GQ, McRae DM, Lagugné-Labarthet F. Probing mid-infrared plasmon resonances in extended radial fractal structures. Opt Lett 2019; 44:3865-3868. [PMID: 31368988 DOI: 10.1364/ol.44.003865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 06/30/2019] [Indexed: 06/10/2023]
Abstract
Infrared (IR) antennas made of metallic nanostructures are widely tunable from the near- to the far-IR range. They can be utilized for a variety of applications such as light harvesting and photonic filters, and their structural linear or circular anisotropy can be exploited to further enhance the sensitivity of spectroscopic measurements. Here gold dendritic fractal structures that were optimized to exhibit multiple resonances in the mid-IR range were characterized using a scattering-type scanning near-field optical IR microscope. The spatially resolved IR maps associated with the individual modes serve as a basis to understand the mode evolution between each fractal generation.
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18
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Cappello D, Therien DAB, Staroverov VN, Lagugné-Labarthet F, Gilroy JB. Optoelectronic, Aggregation, and Redox Properties of Double-Rotor Boron Difluoride Hydrazone Dyes. Chemistry 2019; 25:5994-6006. [PMID: 30821860 DOI: 10.1002/chem.201900383] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/18/2019] [Indexed: 01/11/2023]
Abstract
We develop the chemistry of boron difluoride hydrazone dyes (BODIHYs) bearing two aryl substituents and explore their properties. The low-energy absorption bands (λmax =427-464 nm) of these dyes depend on the nature of the N-aryl groups appended to the BODIHY framework. Electron-donating and extended π-conjugated groups cause a redshift, whereas electron-withdrawing groups result in a blueshift. The title compounds were weakly photoluminescent in solution and strongly photoluminescent as thin films (λPL =525-578 nm) with quantum yields of up to 18 % and lifetimes of 1.1-1.7 ns, consistent with the dominant radiative decay through fluorescence. Addition of water to THF solutions of the BODIHYs studied causes molecular aggregation which restricts intramolecular motion and thereby enhances photoluminescence. The observed photoluminescence of BODIHY thin films is likely facilitated by a similar molecular packing effect. Finally, cyclic voltammetry studies confirmed that BODIHY derivatives bearing para-substituted N-aryl groups could be reversibly oxidized (Eox1 =0.62-1.02 V vs. Fc/Fc+ ) to their radical cation forms. Chemical oxidation studies confirmed that para-substituents at the N-aryl groups are required to circumvent radical decomposition pathways. Our findings provide new opportunities and guiding principles for the design of sought-after multifunctional boron difluoride complexes that are photoluminescent in the solid state.
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Affiliation(s)
- Daniela Cappello
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Denis A B Therien
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Viktor N Staroverov
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Joe B Gilroy
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario, N6A 5B7, Canada
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19
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Abstract
Fractal nanostructures exhibit optical properties that span the visible to far-infrared and are emerging as exciting structures for plasmon-mediated applications.
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Affiliation(s)
- Gregory Q. Wallace
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
| | - François Lagugné-Labarthet
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
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20
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Tabatabaei M, Caetano FA, Pashee F, Ferguson SSG, Lagugné-Labarthet F. Tip-enhanced Raman spectroscopy of amyloid β at neuronal spines. Analyst 2018; 142:4415-4421. [PMID: 29090690 DOI: 10.1039/c7an00744b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The early stages of Alzheimer's disease pathogenesis are thought to occur at the synapse level, since synapse loss can be directly correlated with memory dysfunction. Considerable evidence has suggested that amyloid beta (Aβ), a secreted proteolytic derivative of amyloid precursor protein, appears to be a critical factor in the early 'synaptic failure' that is observed in Alzheimer's disease pathogenesis. The identification of Aβ at neuronal spines with high spatial resolution and high surface specificity would facilitate unraveling the intricate effect of Aβ on synapse loss and its effect on neighboring neuronal connections. Here, tip-enhanced Raman spectroscopy was used to map the presence of Aβ aggregations in the vicinity of the spines exposed to Aβ preformed in vitro. Exposure to Aβ was of 1 and 6 hours. The intensity variation of selected vibrational modes of Aβ was mapped by TERS for different exposure times to Aβ. Of interest, we discuss the distinct contributions of the amide modes from Aβ that are enhanced by the TERS process and in particular the suppression of the amide I mode in the context of recently reported observations in the literature.
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Affiliation(s)
- Mohammadali Tabatabaei
- Department of Chemistry and Centre for Advanced Materials and Biomaterials, University of Western Ontario, London, ON, Canada N6A 5B7.
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21
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Kozachuk MS, Avilés MO, Martin RR, Potts B, Sham TK, Lagugné-Labarthet F. Imaging the Surface of a Hand-Colored 19th Century Daguerreotype. Appl Spectrosc 2018; 72:1215-1224. [PMID: 29749752 DOI: 10.1177/0003702818773760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Daguerreotypes are valued artifacts that constitute a unique historical photographic memory of the 19th century. Understanding their surface chemistry is important in order to conserve and, when necessary, to restore them. Colored highlights were often added by hand to emphasize different features on the daguerreotype's subjects. In the present work, we report on a daguerreotype that was hand-colored with a red pigment that was added to the cheeks of the two individuals. A series of experiments using micro-Raman and micro-Fourier transform infrared spectroscopy and synchrotron-based X-ray fluorescence microscopy and absorption spectroscopy are used to analyze the surface and to determine the nature of the pigment used as well as the common elements present in the fabrication of the daguerreotypes.
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Affiliation(s)
- Madalena S Kozachuk
- The University of Western Ontario (Western University), Department of Chemistry, London, ON, Canada
| | - Maria O Avilés
- The University of Western Ontario (Western University), Department of Chemistry, London, ON, Canada
| | - Ronald R Martin
- The University of Western Ontario (Western University), Department of Chemistry, London, ON, Canada
| | - Brianne Potts
- The University of Western Ontario (Western University), Department of Chemistry, London, ON, Canada
| | - Tsun-Kong Sham
- The University of Western Ontario (Western University), Department of Chemistry, London, ON, Canada
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22
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McRae D, Jeon K, Lagugné-Labarthet F. Plasmon-Mediated Drilling in Thin Metallic Nanostructures. ACS Omega 2018; 3:7269-7277. [PMID: 31458887 PMCID: PMC6644463 DOI: 10.1021/acsomega.8b00774] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/19/2018] [Indexed: 05/22/2023]
Abstract
Thin and ultraflat conductive surfaces are of particular interest to use as substrates for tip-enhanced spectroscopy applications. Tip-enhanced spectroscopy exploits the excitation of a localized surface plasmon resonance mode at the apex of a metallized atomic force microscope tip, confining and enhancing the local electromagnetic field by several orders of magnitude. This allows for nanoscale mapping of the surface with high spatial resolution and surface sensitivity, as demonstrated when coupled to local Raman measurements. In gap-mode tip-enhanced spectroscopy, the specimen of interest is deposited onto a flat metallic surface and probed by a metallic tip, allowing for further electromagnetic confinement and subsequent enhancement. We investigate here a geometry where a gold tip is used in conjunction with a silver nanoplate, thus forming a heterometallic platform for local enhancement. When irradiated, a plasmon-mediated reaction is triggered at the tip-substrate junction due to the enhanced electric field and the transfer of hot electrons from the tip to the nanoplate. This resulting nanoscale reaction appears to be sufficient to ablate the thin silver plates even under weak laser intensity. Such an approach may be further exploited for patterning metallic nanostructures or photoinduced chemical reactions at metal surfaces.
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23
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Kolhatkar G, Merlen A, Zhang J, Dab C, Wallace GQ, Lagugné-Labarthet F, Ruediger A. Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography. Beilstein J Nanotechnol 2018; 9:1536-1543. [PMID: 29977686 PMCID: PMC6009220 DOI: 10.3762/bjnano.9.144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 04/21/2018] [Indexed: 06/08/2023]
Abstract
We introduce a simple, fast, efficient and non-destructive method to study the optical near-field properties of plasmonic nanotriangles prepared by nanosphere lithography. Using a rectangular Fourier filter on the blurred signal together with filtering of the lower spatial frequencies to remove the far-field contribution, the pure near-field contributions of the optical images were extracted. We performed measurements using two excitation wavelengths (532.1 nm and 632.8 nm) and two different polarizations. After the processing of the optical images, the distribution of hot spots can be correlated with the topography of the structures, as indicated by the presence of brighter spots at the apexes of the nanostructures. This technique is validated by comparison of the results to numerical simulations, where agreement is obtained, thereby confirming the near-field nature of the images. Our approach does not require any advanced equipment and we suggest that it could be applied to any type of sample, while keeping the measurement times reasonably short.
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Affiliation(s)
- Gitanjali Kolhatkar
- Institut National de la Recherche Scientifique - Énergie, Matériaux, Télécommunications, 1650 Boulevard Lionel-Boulet, J3X 1S2, Varennes, Québec, Canada
| | - Alexandre Merlen
- IM2NP, UMR CNRS 7334, Aix Marseille Université et Université de Toulon, Site de l’Université de Toulon, 83957 La Garde Cedex, France
- Institut Fresnel UMR 7249, Aix-Marseille Université, CNRS, École Centrale de Marseille, 13013 Marseille, France
| | - Jiawei Zhang
- Institut National de la Recherche Scientifique - Énergie, Matériaux, Télécommunications, 1650 Boulevard Lionel-Boulet, J3X 1S2, Varennes, Québec, Canada
| | - Chahinez Dab
- Institut National de la Recherche Scientifique - Énergie, Matériaux, Télécommunications, 1650 Boulevard Lionel-Boulet, J3X 1S2, Varennes, Québec, Canada
| | - Gregory Q Wallace
- Western University (The University of Western Ontario), Chemistry Department and Centre for Materials and Biomaterials, 1151 Richmond Street, London, ON, N6A5B7, Canada
| | - François Lagugné-Labarthet
- Western University (The University of Western Ontario), Chemistry Department and Centre for Materials and Biomaterials, 1151 Richmond Street, London, ON, N6A5B7, Canada
| | - Andreas Ruediger
- Institut National de la Recherche Scientifique - Énergie, Matériaux, Télécommunications, 1650 Boulevard Lionel-Boulet, J3X 1S2, Varennes, Québec, Canada
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24
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Ding Z, Stubbs JM, McRae D, Blacquiere JM, Lagugné-Labarthet F, Mittler S. A Mass-Producible and Versatile Sensing System: Localized Surface Plasmon Resonance Excited by Individual Waveguide Modes. ACS Sens 2018; 3:334-341. [PMID: 29318873 DOI: 10.1021/acssensors.7b00736] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A plasmonic sensing system that allows the excitation of localized surface plasmon resonance (LSPR) by individual waveguide modes is presented conceptually and experimentally. Any change in the local environment of the gold nanoparticles (AuNPs) alters the degree of coupling between LSPR and a polymer slab waveguide, which then modulates the transmission-output signal. In comparison to conventional LSPR sensors, this system is less susceptible to optical noise and positional variation of signals. Moreover, it enables more freedom in the exploitation of plasmonic hot spots with both transverse electric (TE) and transverse magnetic (TM) modes. Through real-time measurement, it is demonstrated that the current sensing system is more sensitive than comparable optical fiber plasmonic sensors. The highest normalized bulk sensitivity (7.744 RIU-1) is found in the TM1 mode. Biosensing with the biotin-streptavidin system shows that the detection limit is on the order of 10-14 M of streptavidin. With further optimization, this sensing system can easily be mass-produced and incorporated into high throughput screening devices, detecting a variety of chemical and biological analytes via immobilization of the appropriate recognition sites.
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Affiliation(s)
- Zhutian Ding
- Department
of Physics and Astronomy, The University of Western Ontario, 1151
Richmond Street, London, Ontario, Canada N6A 3K7
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - James M. Stubbs
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Danielle McRae
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Johanna M. Blacquiere
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - François Lagugné-Labarthet
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Silvia Mittler
- Department
of Physics and Astronomy, The University of Western Ontario, 1151
Richmond Street, London, Ontario, Canada N6A 3K7
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
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25
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Coady MJ, Wood M, Wallace GQ, Nielsen KE, Kietzig AM, Lagugné-Labarthet F, Ragogna PJ. Icephobic Behavior of UV-Cured Polymer Networks Incorporated into Slippery Lubricant-Infused Porous Surfaces: Improving SLIPS Durability. ACS Appl Mater Interfaces 2018; 10:2890-2896. [PMID: 29155549 DOI: 10.1021/acsami.7b14433] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ice accretion causes damage on power generation infrastructure, leading to mechanical failure. Icephobic materials are being researched so that ice buildup on these surfaces will be shed before the weight of the ice causes catastrophic damage. Lubricated materials have imposed the lowest-recorded forces of ice adhesion, and therefore lubricated materials are considered the state-of-the-art in this area. Slippery lubricant-infused porous surfaces (SLIPS) are one type of such materials. SLIPS are initially very effective at repelling ice, but the trapped fluid layer that affords their icephobic properties is easily depleted by repeated icing/deicing cycles, even after one deicing event. UV-cured siloxane resins were infused into SLIPS to observe effects on icephobicity and durability. These UV-cured polymer networks enhanced both the icephobicity and longevity of the SLIPS; values of ice adhesion below 10 kPa were recorded, and appreciable icephobicity was maintained up to 10 icing/deicing cycles.
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Affiliation(s)
- Matthew J Coady
- Department of Chemistry, Western University , 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Michael Wood
- Department of Chemical Engineering, McGill University , 3610 University Street, Montréal, Québec H3A 0C5, Canada
| | - Gregory Q Wallace
- Department of Chemistry, Western University , 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Kent E Nielsen
- Product Innovation Lab, 3M Canada Company , 1840 Oxford Street East, London, Ontario N5V 3R6, Canada
| | - Anne-Marie Kietzig
- Department of Chemical Engineering, McGill University , 3610 University Street, Montréal, Québec H3A 0C5, Canada
| | | | - Paul J Ragogna
- Department of Chemistry, Western University , 1151 Richmond Street, London, Ontario N6A 3K7, Canada
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26
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Dhindsa JS, Maar RR, Barbon SM, Olivia Avilés M, Powell ZK, Lagugné-Labarthet F, Gilroy JB. A π-conjugated inorganic polymer constructed from boron difluoride formazanates and platinum(ii) diynes. Chem Commun (Camb) 2018; 54:6899-6902. [DOI: 10.1039/c8cc02424c] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A π-conjugated inorganic polymer comprised of boron difluoride formazanate and platinum(ii) diyne repeat units with unusual redox properties and a narrow optical band gap of ca. 1.4 eV is introduced.
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Affiliation(s)
- Jasveer S. Dhindsa
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Ryan R. Maar
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Stephanie M. Barbon
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - María Olivia Avilés
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Zachary K. Powell
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - François Lagugné-Labarthet
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Joe B. Gilroy
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
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27
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Affiliation(s)
- Olivier Nguon
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
- 3M Canada Company, London, Ontario, Canada
| | | | | | - Jian Li
- 3M Canada Company, London, Ontario, Canada
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada
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28
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Levchenko TI, Kübel C, Khalili Najafabadi B, Boyle PD, Cadogan C, Goncharova LV, Garreau A, Lagugné-Labarthet F, Huang Y, Corrigan JF. Luminescent CdSe Superstructures: A Nanocluster Superlattice and a Nanoporous Crystal. J Am Chem Soc 2017; 139:1129-1144. [DOI: 10.1021/jacs.6b10490] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetyana I. Levchenko
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Christian Kübel
- Institute
of Nanotechnology and Karlsruhe NanoMicro Facility, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | | | - Paul D. Boyle
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Carolyn Cadogan
- Department
of Physics and Astronomy, The University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Lyudmila V. Goncharova
- Department
of Physics and Astronomy, The University of Western Ontario, London, Ontario N6A 3K7, Canada
- The
Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Alexandre Garreau
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
- The
Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Yining Huang
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
- The
Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - John F. Corrigan
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
- The
Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
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29
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Fan B, Trant JF, Yardley RE, Pickering AJ, Lagugné-Labarthet F, Gillies ER. Photocontrolled Degradation of Stimuli-Responsive Poly(ethyl glyoxylate): Differentiating Features and Traceless Ambient Depolymerization. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01620] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Bo Fan
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B9
| | - John F. Trant
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond
St., London, Ontario, Canada N6A 5B7
| | - Rebecca E. Yardley
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond
St., London, Ontario, Canada N6A 5B7
| | - Andrew J. Pickering
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B9
| | - François Lagugné-Labarthet
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond
St., London, Ontario, Canada N6A 5B7
| | - Elizabeth R. Gillies
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B9
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond
St., London, Ontario, Canada N6A 5B7
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30
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Pashaee F, Tabatabaei M, Caetano FA, Ferguson SSG, Lagugné-Labarthet F. Tip-enhanced Raman spectroscopy: plasmid-free vs. plasmid-embedded DNA. Analyst 2016; 141:3251-8. [DOI: 10.1039/c6an00350h] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Hou R, Shynkar V, Lafargue C, Kolkowski R, Zyss J, Lagugné-Labarthet F. Second harmonic generation from gold meta-molecules with three-fold symmetry. Phys Chem Chem Phys 2016; 18:7956-65. [DOI: 10.1039/c6cp00154h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Polarization dependence SHG measurements reveal four-lobe patterns which can be assigned to structures with three-fold symmetry.
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Affiliation(s)
- Renjie Hou
- Department of Chemistry
- Department of Physics and Astronomy
- The University of Western Ontario
- London
- Canada
| | - Vasyl Shynkar
- Laboratory of Quantum and Molecular Photonics
- Institut d'Alembert, Ecole Normale Supérieure de Cachan
- 94230 Cachan
- France
| | - Clément Lafargue
- Laboratory of Quantum and Molecular Photonics
- Institut d'Alembert, Ecole Normale Supérieure de Cachan
- 94230 Cachan
- France
| | - Radoslaw Kolkowski
- Laboratory of Quantum and Molecular Photonics
- Institut d'Alembert, Ecole Normale Supérieure de Cachan
- 94230 Cachan
- France
- Advanced Materials Engineering and Modelling Group
| | - Joseph Zyss
- Laboratory of Quantum and Molecular Photonics
- Institut d'Alembert, Ecole Normale Supérieure de Cachan
- 94230 Cachan
- France
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32
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Wallace GQ, Tabatabaei M, Zuin MS, Workentin MS, Lagugné-Labarthet F. A nanoaggregate-on-mirror platform for molecular and biomolecular detection by surface-enhanced Raman spectroscopy. Anal Bioanal Chem 2015; 408:609-18. [PMID: 26521177 DOI: 10.1007/s00216-015-9142-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/07/2015] [Accepted: 10/21/2015] [Indexed: 12/13/2022]
Abstract
A nanoaggregate-on-mirror (NAOM) structure has been developed for molecular and biomolecular detection using surface-enhanced Raman spectroscopy (SERS). The smooth surface of the gold mirror allows for simple and homogeneous functionalization, while the introduction of the nanoaggregates enhances the Raman signal of the molecule(s) in the vicinity of the aggregate-mirror junction. This is evidenced by functionalizing the gold mirror with 4-nitrothiophenol, and the further addition of gold nanoaggregates promotes local SERS activity only in the areas with the nanoaggregates. The application of the NAOM platform for biomolecular detection is highlighted using glucose and H2O2 as molecules of interest. In both cases, the gold mirror is functionalized with 4-mercaptophenylboronic acid (4-MPBA). Upon exposure to glucose, the boronic acid moiety of 4-MPBA forms a cyclic boronate ester. Once the nanoaggregates are added to the surface, detection of glucose is possible without the use of an enzyme. This method of indirect detection provides a limit of detection of 0.05 mM, along with a linear range of detection from 0.1 to 15 mM for glucose, encompassing the physiological range of blood glucose concentration. The detection of H2O2 is achieved with optical inspection and SERS. The H2O2 interferes with the coating of the gold mirror, enabling qualitative detection by visual inspection. Simultaneously, the H2O2 reacts with the boronic acid to form a phenol, a change that is detected by SERS.
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Affiliation(s)
- Gregory Q Wallace
- Department of Chemistry, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Mohammadali Tabatabaei
- Department of Chemistry, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Mariachiara S Zuin
- Department of Chemistry, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - Mark S Workentin
- Department of Chemistry, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada. .,Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.
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33
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Tabatabaei M, Wallace GQ, Caetano FA, Gillies ER, Ferguson SSG, Lagugné-Labarthet F. Controlled positioning of analytes and cells on a plasmonic platform for glycan sensing using surface enhanced Raman spectroscopy. Chem Sci 2015; 7:575-582. [PMID: 28791107 PMCID: PMC5519955 DOI: 10.1039/c5sc03332b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 10/13/2015] [Indexed: 12/22/2022] Open
Abstract
Controlled analyte and cell positioning is enabled on a plasmonic platform with patterned fluorocarbon polymer thin films for SERS-based glycan sensing.
The rise of molecular plasmonics and its application to ultrasensitive spectroscopic measurements has been enabled by the rational design and fabrication of a variety of metallic nanostructures. Advanced nano and microfabrication methods are key to the development of such structures, allowing one to tailor optical fields at the sub-wavelength scale, thereby optimizing excitation conditions for ultrasensitive detection. In this work, the control of both analyte and cell positioning on a plasmonic platform is enabled using nanofabrication methods involving patterning of fluorocarbon (FC) polymer (C4F8) thin films on a plasmonic platform fabricated by nanosphere lithography (NSL). This provides the possibility to probe biomolecules of interest in the vicinity of cells using plasmon-mediated surface enhanced spectroscopies. In this context, we demonstrate the surface enhanced biosensing of glycan expression in different cell lines by surface enhanced Raman spectroscopy (SERS) on these plasmonic platforms functionalized with 4-mercaptophenylboronic acid (4-MPBA) as the Raman reporter. These cell lines include human embryonic kidney (HEK 293), C2C12 mouse myoblasts, and HeLa (Henrietta Lacks) cervical cancer cells. A distinct glycan expression is observed for cancer cells compared to other cell lines by confocal SERS mapping. This suggests the potential application of these versatile SERS platforms for differentiating cancerous from non-cancerous cells.
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Affiliation(s)
- Mohammadali Tabatabaei
- Department of Chemistry and Center for Advanced Materials and Biomaterials , University of Western Ontario , London , ON , Canada N6A 5B7 . ; ; Tel: +1 519 661 2111 ext. 81006
| | - Gregory Q Wallace
- Department of Chemistry and Center for Advanced Materials and Biomaterials , University of Western Ontario , London , ON , Canada N6A 5B7 . ; ; Tel: +1 519 661 2111 ext. 81006
| | - Fabiana A Caetano
- J. Allyn Taylor Centre for Cell Biology , Robarts Research Institute , Department of Physiology and Pharmacology , University of Western Ontario , 100 Perth Drive St. , London , ON , Canada N6A 5K8
| | - Elizabeth R Gillies
- Department of Chemistry and Center for Advanced Materials and Biomaterials , University of Western Ontario , London , ON , Canada N6A 5B7 . ; ; Tel: +1 519 661 2111 ext. 81006.,Department of Chemical and Biochemical Engineering , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B9
| | - Stephen S G Ferguson
- J. Allyn Taylor Centre for Cell Biology , Robarts Research Institute , Department of Physiology and Pharmacology , University of Western Ontario , 100 Perth Drive St. , London , ON , Canada N6A 5K8
| | - François Lagugné-Labarthet
- Department of Chemistry and Center for Advanced Materials and Biomaterials , University of Western Ontario , London , ON , Canada N6A 5B7 . ; ; Tel: +1 519 661 2111 ext. 81006
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34
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Snell KE, Hou R, Ishow E, Lagugné-Labarthet F. Enhanced Rates of Photoinduced Molecular Orientation in a Series of Molecular Glassy Thin Films. Langmuir 2015; 31:7296-7305. [PMID: 26072966 DOI: 10.1021/acs.langmuir.5b01319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Photoinduced orientation in a series of molecular glasses made of small push-pull azo derivatives is dynamically investigated for the first time. Birefringence measurements at 632.8 nm are conducted with a temporal resolution of 100 ms to probe the fast rate of the azo orientation induced under polarized light and its temporal stability over several consecutive cycles. To better evaluate the influence of the azo chemical substituents and their electronic properties on the orientation of the whole molecule, a series of push-pull azo derivatives involving a triphenylaminoazo core substituted with distinct electron-withdrawing moieties is studied. All resulting thin films are probed using polarization modulation infrared spectroscopy that yields dynamical linear dichroism measurements during a cycle of orientation followed by relaxation. We show here in particular that the orientation rates of small molecule-based azo materials are systematically increased up to 7-fold compared to those of a reference polymer counterpart. For specific compounds, the percentage of remnant orientation is also higher, which makes these materials of great interest and promising alternatives to azobenzene-containing polymers for a variety of applications requiring a fast response and absolute control over the molecular weight.
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Affiliation(s)
- Kristen E Snell
- †CEISAM-UMR CNRS 6230, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | | | - Eléna Ishow
- †CEISAM-UMR CNRS 6230, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
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35
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Xiao Y, Karttunen M, Jalkanen J, Mussi M, Liao Y, Grohe B, Lagugné-Labarthet F, Siqueira W. Hydroxyapatite Growth Inhibition Effect of Pellicle Statherin Peptides. J Dent Res 2015; 94:1106-12. [DOI: 10.1177/0022034515586769] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
In our recent studies, we have shown that in vivo–acquired enamel pellicle is a sophisticated biological structure containing a significant portion of naturally occurring salivary peptides. From a functional aspect, the identification of peptides in the acquired enamel pellicle is of interest because many salivary proteins exhibit functional domains that maintain the activities of the native protein. Among the in vivo–acquired enamel pellicle peptides that have been newly identified, 5 peptides are derived from statherin. Here, we assessed the ability of these statherin pellicle peptides to inhibit hydroxyapatite crystal growth. In addition, atomistic molecular dynamics (MD) simulations were performed to better understand the underlying physical mechanisms of hydroxyapatite growth inhibition. A microplate colorimetric assay was used to quantify hydroxyapatite growth. Statherin protein, 5 statherin-derived peptides, and a peptide lacking phosphate at residues 2 and 3 were analyzed. Statherin peptide phosphorylated on residues 2 and 3 indicated a significant inhibitory effect when compared with the 5 other peptides ( P < 0.05). MD simulations showed a strong affinity and fast adsorption to hydroxyapatite for phosphopeptides, whereas unphosphorylated peptides interacted weakly with the hydroxyapatite. Our data suggest that the presence of a covalently linked phosphate group (at residues 2 and 3) in statherin peptides modulates the effect of hydroxyapatite growth inhibition. This study provides a mechanism to account for the composition and function of acquired enamel pellicle statherin peptides that will contribute as a base for the development of biologically stable and functional synthetic peptides for therapeutic use against dental caries and/or periodontal disease.
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Affiliation(s)
- Y. Xiao
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, ON, Canada
| | - M. Karttunen
- Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON, Canada
| | - J. Jalkanen
- Jülich Supercomputing Centre, Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany
| | - M.C.M. Mussi
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, ON, Canada
| | - Y. Liao
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, ON, Canada
| | - B. Grohe
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, ON, Canada
| | | | - W.L. Siqueira
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, ON, Canada
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36
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Cheng XR, Wallace GQ, Lagugné-Labarthet F, Kerman K. Au nanostructured surfaces for electrochemical and localized surface plasmon resonance-based monitoring of α-synuclein-small molecule interactions. ACS Appl Mater Interfaces 2015; 7:4081-4088. [PMID: 25622115 DOI: 10.1021/am507972b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this proof-of-concept study, the fabrication of novel Au nanostructured indium tin oxide (Au-ITO) surfaces is described for the development of a dual-detection platform with electrochemical and localized surface plasmon resonance (LSPR)-based biosensing capabilities. Nanosphere lithography (NSL) was applied to fabricate Au-ITO surfaces. Oligomers of α-synuclein (αS) were covalently immobilized to determine the electrochemical and LSPR characteristics of the protein. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were performed using the redox probe [Fe(CN)6](3-/4-) to detect the binding of Cu(II) ions and (-)-epigallocatechin-3-gallate (EGCG) to αS on the Au-ITO surface. Electrochemical and LSPR data were complemented by Thioflavin-T (ThT) fluorescence, surface plasmon resonance imaging (SPRi), and transmission electron microscopy (TEM) studies. EGCG was shown to induce the formation of amorphous aggregates that decreased the electrochemical signals. However, the binding of EGCG with αS increased the LSPR absorption band with a bathochromic shift of 10-15 nm. The binding of Cu(II) to αS enhanced the DPV peak current intensity. NSL fabricated Au-ITO surfaces provide a promising dual-detection platform to monitor the interaction of small molecules with proteins using electrochemistry and LSPR.
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Affiliation(s)
- Xin R Cheng
- Department of Physical and Environmental Sciences, University of Toronto Scarborough , Toronto, Ontario M1C 1A4, Canada
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37
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Snell KE, Mevellec JY, Humbert B, Lagugné-Labarthet F, Ishow E. Photochromic organic nanoparticles as innovative platforms for plasmonic nanoassemblies. ACS Appl Mater Interfaces 2015; 7:1932-1942. [PMID: 25561442 DOI: 10.1021/am5076953] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The fabrication of hybrid core-shell nanoassemblies involving a nondoped azo photochromic core coated with a dense shell of gold nanoparticles is reported to investigate the influence of localized plasmons onto the azo core photoisomerization. Photochromic organic nanoparticles, regarded as a novel class of high-density photoswitchable nanomaterials, are first elaborated upon precipitation in water of push-pull azo molecules, containing sulfur-terminated units to chelate gold nanoparticles. Photoisomerization studies of the azo nanoparticles reveal significantly higher E → Z photoconversion yields and Z → E thermal back relaxation rate constants compared to those of dyes processed as thin films and in solution, respectively. These unexpected results are ascribed to the large surface-to-volume ratio and cooperative effects encountered in nanoparticles that deform without disassembling under polarized illumination as a result of the weak change in the azo dipole moment. UV-vis spectroscopy and Raman microscopy of the hybrid nanoassemblies show strong optical coupling between both photoactive constituents, confirming that gold nanoparticles are tightly positioned on the azo core surface. Such coupling causes partial quenching of the azo photoisomerization but does not impact the thermal back relaxation. Longer sulfur-terminated chains provide reduced quenching of the photoreaction by the localized plasmons, thereby opening perspectives toward plasmon-mediated deformation of nano-objects for light-controlled nanomechanics.
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Affiliation(s)
- Kristen E Snell
- CEISAM-UMR CNRS 6230, Université de Nantes , 2 rue de la Houssinière, 44322 Nantes, France
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38
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Wallace GQ, Zuin MS, Tabatabaei M, Gobbo P, Lagugné-Labarthet F, Workentin MS. Gold nanosponges (AuNS): a versatile nanostructure for surface-enhanced Raman spectroscopic detection of small molecules and biomolecules. Analyst 2015; 140:7278-82. [DOI: 10.1039/c5an01127b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Prepared by simple pour and mix chemistry, gold nanosponges (AuNS) are versatile structures for surface-enhanced Raman spectroscopy (SERS).
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Affiliation(s)
- Gregory Q. Wallace
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Mariachiara S. Zuin
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Mohammadali Tabatabaei
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Pierangelo Gobbo
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - François Lagugné-Labarthet
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Mark S. Workentin
- Department of Chemistry
- and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada N6A 5B7
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39
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Kazemi-Zanjani N, Gobbo P, Zhu Z, Workentin MS, Lagugné-Labarthet F. High-resolution Raman imaging of bundles of single-walled carbon nanotubes by tip-enhanced Raman spectroscopy. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0247] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Bundles of single-walled carbon nanotubes (SWCNTs) prepared by plasma torch method and further purified, are deposited over a glass coverslip to estimate the spatial resolution of tip-enhanced Raman spectroscopy measurements. For this purpose, near-field Raman maps and spectra of isolated bundles of carbon nanotubes are collected using optimized experimental conditions such as a tightly focused beam using a 1.4 numerical aperture oil immersion microscope objective and a gold coated atomic force microscope probe illuminated by a radially polarized 632.8 nm wavelength to selectively excite the localized surface plasmon confined at the extremity of the tip. The near-field nature of the collected Raman signals is evaluated through measuring the decay of the Raman signal with respect to the tip-sample separation.
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Affiliation(s)
- Nastaran Kazemi-Zanjani
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151Richmond Street, London, ON N6A 5B7, Canada
| | - Pierangelo Gobbo
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151Richmond Street, London, ON N6A 5B7, Canada
| | - Ziyan Zhu
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151Richmond Street, London, ON N6A 5B7, Canada
| | - Mark S. Workentin
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151Richmond Street, London, ON N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151Richmond Street, London, ON N6A 5B7, Canada
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40
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Pashaee F, Sharifi F, Fanchini G, Lagugné-Labarthet F. Tip-enhanced Raman spectroscopy of graphene-like and graphitic platelets on ultraflat gold nanoplates. Phys Chem Chem Phys 2015; 17:21315-22. [DOI: 10.1039/c4cp05252h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
TERS was used to investigate the graphene-like platelets in gap mode geometry using radially and linearly polarized excitation.
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Affiliation(s)
- Farshid Pashaee
- Department of Chemistry
- Department of Physics & Astronomy and Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
| | - Faranak Sharifi
- Department of Chemistry
- Department of Physics and Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
| | - Giovanni Fanchini
- Department of Chemistry
- Department of Physics and Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
| | - François Lagugné-Labarthet
- Department of Chemistry
- Department of Physics & Astronomy and Centre for Advanced Materials and Biomaterials Research
- University of Western Ontario
- London
- Canada
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41
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Vedraine S, Hou R, Norton PR, Lagugné-Labarthet F. On the absorption and electromagnetic field spectral shifts in plasmonic nanotriangle arrays. Opt Express 2014; 22:13308-13313. [PMID: 24921524 DOI: 10.1364/oe.22.013308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The behavior of the electromagnetic field interaction with gold nanotriangles organized in bow-tie arrays is investigated. A side-by-side comparison between the measured absorbance of the array and the modelled integrated electric field resonances confined around the gold structures is presented and discussed to explain the spectral shift between both parameters. Finite difference time domain calculations and Raman measurements of gold triangles of different sizes and periodicity are systematically performed. Numerical calculations show that the spectral maximum of the electric field varies in distinct areas over the metallic structures.
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Snell KE, Stéphant N, Pansu RB, Audibert JF, Lagugné-Labarthet F, Ishow E. Nanoparticle organization through photoinduced bulk mass transfer. Langmuir 2014; 30:2926-2935. [PMID: 24588660 DOI: 10.1021/la404988d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A series of dipolar triphenylaminoazo derivatives, with largely distinct charge transfer and glass transition temperatures, has been synthesized. Their photomigration capability in the solid state to form surface relief gratings (SRGs) under interferential illumination has been investigated with respect to their photochromic properties and showed a prevailing influence of the bulkiness of the azo substituent. The azo mass transfer was utilized to efficiently photoalign 200 nm polystyrene nanoparticles along the SRG crests, which were initially deposited on nonirradiated azo surfaces. In contrast, nanoparticles spin cast on prestructured surface relief gratings were localized in the troughs of the periodic structures. These distinct locations point out the ability of isotropic and amorphous photochromic thin films to collectively move and organize nano-objects in an ordered fashion through the use of polarized illumination. This versatile approach opens the path to optically aligned ensembles of individual nano-objects over large areas, which can be further combined with metallic conductive or magnetic coating to create novel functional nanostructures.
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Affiliation(s)
- Kristen E Snell
- CEISAM-UMR CNRS 6230, Université de Nantes , 2 rue de la Houssinière, 44322 Nantes, France
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43
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Wallace GQ, Tabatabaei M, Lagugné-Labarthet F. Towards attomolar detection using a surface-enhanced Raman spectroscopy platform fabricated by nanosphere lithography. CAN J CHEM 2014. [DOI: 10.1139/cjc-2013-0340] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The limit of detection of 4-nitrothiophenol adsorbed onto the surface of a platform fabricated by nanosphere lithography is investigated by surface-enhanced Raman spectroscopy. Critical factors such as the functionalization time and the change of sharpness of the gold nanostructures upon annealing are studied. Platforms for surface-enhanced Raman spectroscopy provide detection ranging from monolayers down to isolated molecules. For a functionalization time of 24 h, a limit of detection of 10−16 mol/L (100 amol/L) is achieved. Furthermore, by shortening the functionalization time to 30 min, a significantly higher limit of detection is determined ranging from 10−6 to 10−9 mol/L. By altering the shape of the nanotriangles via annealing, a loss in signal intensity occurs. Optimizing the factors that enable a lower limit of detection is critical for many applications where surface-enhanced Raman spectroscopy can be considered as a promising analytical alternative.
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Affiliation(s)
- Gregory Q. Wallace
- Department of Chemistry and Centre for Advanced Materials and Biomaterials, The University of Western Ontario (Western University), London, ON N6A 5B7, Canada
| | - Mohammadali Tabatabaei
- Department of Chemistry and Centre for Advanced Materials and Biomaterials, The University of Western Ontario (Western University), London, ON N6A 5B7, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry and Centre for Advanced Materials and Biomaterials, The University of Western Ontario (Western University), London, ON N6A 5B7, Canada
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Abstract
Over the past five years, new developments in the field of plasmonics have emerged with the goal of finely tuning a variety of metallic nanostructures to enable a desired function. The use of plasmonics in spectroscopy is of course of great interest, due to large local enhancements in the optical near field confined in the vicinity of a metal nanostructure. For a given metal, such enhancements are dependent on the shape of the structure as well as the optical properties (wavelength, phase, polarization) of the impinging light, offering a large degree of control over the optical and spatial localization of the plasmon resonance. In this focal point, we highlight recent work that aims at revealing the spatial position of the localized plasmon resonances using a variety of optical and non-optical methods.
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Affiliation(s)
- Alexandre Merlen
- Institut Matériaux Microélectronique Nanosciences De Provence (Im2np) Umr Cnrs 7334 And Universités D'aix-Marseille Et De Toulon, France
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Kazemi-Zanjani N, Vedraine S, Lagugné-Labarthet F. Localized enhancement of electric field in tip-enhanced Raman spectroscopy using radially and linearly polarized light. Opt Express 2013; 21:25271-6. [PMID: 24150367 DOI: 10.1364/oe.21.025271] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Finite-Difference Time-Domain (FDTD) calculations are used to characterize the electric field in the vicinity of a sharp silver or gold cone with an apex diameter of 10 nm. The simulations are utilized to predict the intensity and the distribution of the locally enhanced electric field in tip-enhanced Raman spectroscopy (TERS). A side-by-side comparison of the enhanced electric field induced by a radially and a linearly polarized light in both gap-mode and conventional TERS setup is performed. For this purpose, a radially polarized source is introduced and integrated into the FDTD modeling. Additionally, the optical effect of a thin protective layer of alumina on the enhancement of the electric field is investigated.
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Kazemi-Zanjani N, Kergrene E, Liu L, Sham TK, Lagugné-Labarthet F. Tip-enhanced Raman imaging and nano spectroscopy of etched silicon nanowires. Sensors (Basel) 2013; 13:12744-59. [PMID: 24072021 PMCID: PMC3859034 DOI: 10.3390/s131012744] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 09/12/2013] [Indexed: 01/08/2023]
Abstract
Tip-enhanced Raman spectroscopy (TERS) is used to investigate the influence of strains in isolated and overlapping silicon nanowires prepared by chemical etching of a (100) silicon wafer. An atomic force microscopy tip made of nanocrystalline diamond coated with a thin layer of silver is used in conjunction with an excitation wavelength of 532 nm in order to probe the first order optical phonon mode of the [100] silicon nanowires. The frequency shift and the broadening of the silicon first order phonon are analyzed and compared to the topographical measurements for distinct configuration of nanowires that are disposed in straight, bent or overlapping configuration over a microscope coverslip. The TERS spatial resolution is close to the topography provided by the nanocrystalline diamond tip and subtle spectral changes are observed for different nanowire configurations.
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Affiliation(s)
- Nastaran Kazemi-Zanjani
- Department of Chemistry and Centre for Advanced Materials and Biomaterials, University of Western Ontario, 1151 Richmond Street, London, N6A 5B7, Canada.
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Galarreta BC, Tabatabaei M, Guieu V, Peyrin E, Lagugné-Labarthet F. Microfluidic channel with embedded SERS 2D platform for the aptamer detection of ochratoxin A. Anal Bioanal Chem 2012. [PMID: 23187825 DOI: 10.1007/s00216-012-6557-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A selective aptameric sequence is adsorbed on a two-dimensional nanostructured metallic platform optimized for surface-enhanced Raman spectroscopy (SERS) measurements. Using nanofabrication methods, a metallic nanostructure was prepared by electron-beam lithography onto a glass coverslip surface and embedded within a microfluidic channel made of polydimethylsiloxane, allowing one to monitor in situ SERS fingerprint spectra from the adsorbed molecules on the metallic nanostructures. The gold structure was designed so that its localized surface plasmon resonance matches the excitation wavelength used for the Raman measurement. This optofluidic device is then used to detect the presence of a toxin, namely ochratoxin-A (OTA), in a confined environment, using very small amounts of chemicals, and short data acquisition times, by taking advantage of the optical properties of a SERS platform to magnify the Raman signals of the aptameric monolayer system and avoiding chemical labeling of the aptamer or the OTA target.
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Affiliation(s)
- Betty C Galarreta
- Department of Chemistry, University of Western Ontario, London, ON, Canada
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Kazemi-Zanjani N, Chen H, Goldberg HA, Hunter GK, Grohe B, Lagugné-Labarthet F. Label-Free Mapping of Osteopontin Adsorption to Calcium Oxalate Monohydrate Crystals by Tip-Enhanced Raman Spectroscopy. J Am Chem Soc 2012; 134:17076-82. [DOI: 10.1021/ja3057562] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Nastaran Kazemi-Zanjani
- Department of Chemistry, University of Western Ontario (Western University), 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
| | | | | | | | | | - François Lagugné-Labarthet
- Department of Chemistry, University of Western Ontario (Western University), 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
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Fathi F, Lagugné-Labarthet F, Pedersen DB, Kraatz HB. Studies of the interaction of two organophosphonates with nanostructured silver surfaces. Analyst 2012; 137:4448-53. [DOI: 10.1039/c2an35641d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gobbo P, Ghiassian S, Hesari M, Stamplecoskie KG, Kazemi-Zanjani N, Lagugné-Labarthet F, Workentin MS. Electrochemistry of robust gold nanoparticle–glassy carbon hybrids generated using a patternable photochemical approach. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm34984a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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