1851
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Zayak AT, Choo H, Hu YS, Gargas DJ, Cabrini S, Bokor J, Schuck PJ, Neaton JB. Harnessing Chemical Raman Enhancement for Understanding Organic Adsorbate Binding on Metal Surfaces. J Phys Chem Lett 2012; 3:1357-1362. [PMID: 26286783 DOI: 10.1021/jz300374d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [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: 06/04/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a known approach for detecting trace amounts of molecular species. Whereas SERS measurements have focused on enhancing the signal for sensing trace amounts of a chemical moiety, understanding how the substrate alters molecular Raman spectra can enable optical probing of analyte binding chemistry. Here we examine binding of trans-1,2-two(4-pyridyl) ethylene (BPE) to Au surfaces and understand variations in experimental data that arise from differences in how the molecule binds to the substrate. Monitoring differences in the SERS as a function of incubation time, a period of several hours in our case, reveals that the number of BPE molecules that chemically binds with the Au substrate increases with time. In addition, we introduce a direct method of accessing relative chemical enhancement from experiments that is in quantitative agreement with theory. The ability to probe optically specific details of metal/molecule interfaces opens up possibilities for using SERS in chemical analysis.
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Affiliation(s)
- Alexey T Zayak
- †Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- ∥Department of Electrical Engineering and Computer Sciences, UC Berkeley, Berkeley, California, United States
| | - Hyuck Choo
- ‡The Moore Laboratory, Electrical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Ying S Hu
- §Waitt Advanced Biophotonics Center, Salk Institute, La Jolla, California 92037, United States
| | - Daniel J Gargas
- †Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stefano Cabrini
- †Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jeffrey Bokor
- ∥Department of Electrical Engineering and Computer Sciences, UC Berkeley, Berkeley, California, United States
| | - P James Schuck
- †Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jeffrey B Neaton
- †Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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1852
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Abstract
Silver silica gold sandwich nanoparticles were synthesized by a multistep seeded growth process and were characterized by UV-vis spectroscopy, transmission electron microscopy, and X-ray diffraction. Gold islands allow passage of light through the crevices into the silica layer, and the silver core-silica shell behaves like a mirror, thus reflecting the light incident on it. These structures facilitate light amplification due to mixing of light waves from the multiple reflections. Sandwich nanoparticles show SERS enhancement of ∼10(6). This enhancement factor is 6-fold larger in magnitude than that of similar nanoparticles without the silver core under identical experimental conditions.
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Affiliation(s)
- Gayatri Kumari
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - Chandrabhas Narayana
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
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1853
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Hao Q, Wang B, Bossard JA, Kiraly B, Zeng Y, Chiang IK, Jensen L, Werner DH, Huang TJ. Surface-Enhanced Raman Scattering Study on Graphene-Coated Metallic Nanostructure Substrates. J Phys Chem C Nanomater Interfaces 2012; 116:7249-7254. [PMID: 24772200 PMCID: PMC3998773 DOI: 10.1021/jp209821g] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Graphene, which has a linear electronic band structure, is widely considered as a semimetal. In the present study, we combine graphene with conventional metallic surface-enhanced Raman scattering (SERS) substrates to achieve higher sensitivity of SERS detection. We synthesize high-quality, single-layer graphene sheets by chemical vapor deposition (CVD) and transfer them from copper foils to gold nanostructures, i.e., nanoparticle or nanohole arrays. SERS measurements are carried out on methylene blue (MB) molecules. The combined graphene nanostructure substrates show about threefold or ninefold enhancement in the Raman signal of MB, compared with the bare nanohole or nanoparticle substrates, respectively. The difference in the enhancement factors is explained by the different morphologies of graphene on the two substrates with the aid of numerical simulations. Our study indicates that applying graphene to SERS substrates can be an effective way to improve the sensitivity of conventional metallic SERS substrates.
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Affiliation(s)
- Qingzhen Hao
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802
- Department of Physics, The Pennsylvania State University, University Park, PA 16802
| | - Bei Wang
- Department of Physics, The Pennsylvania State University, University Park, PA 16802
| | - Jeremy A. Bossard
- Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802
| | - Brian Kiraly
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802
| | - Yong Zeng
- Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802
| | - I-Kao Chiang
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802
| | - Lasse Jensen
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
| | - Douglas H. Werner
- Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802
| | - Tony Jun Huang
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802
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1854
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Correia-Ledo D, Gibson KF, Dhawan A, Couture M, Vo-Dinh T, Graham D, Masson JF. Assessing the Location of Surface Plasmons Over Nanotriangle and Nanohole Arrays of Different Size and Periodicity. J Phys Chem C Nanomater Interfaces 2012; 116:6884-6892. [PMID: 23977402 PMCID: PMC3748999 DOI: 10.1021/jp3009018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The increasing popularity of surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) sensor design based on nanotriangle or nanohole arrays, and the possibility to manufacture substrates at the transition between these plasmonic substrates, makes them ideal candidates for the establishment of structure-property relationships. This work features near diffraction-limited Raman images and FDTD simulations of nanotriangle and nanohole arrays substrates, which clearly demonstrate that the localization of the hot spot on these SERS substrates is significantly influenced by the ratio of diameter/periodicity (D/P). The experimental and simulation data reveal that the hot spots are located around nanotriangles (D/P = 1), characteristic of localized SPR. Decreasing the D/P ratio to 0.75-0.7 led to the creation of nanohole arrays, which promoted the excitation of a propagating surface plasmon (SP) delocalized over the metal network. The optimal SERS intensity was consistently achieved at this transition from nanotriangles to nanoholes, for every periodicity (650 nm to 1.5 μm) and excitation wavelength (633 and 785 nm) investigated, despite the presence or absence of a plasmonic band near the laser excitation. Further decreasing the D/P ratio led to excitation of a localized SP located around the rim of nanohole arrays for D/P of 0.5-0.6, in agreement with previous reports. In addition, this manuscript provides the first evidence that the hot spots are positioned inside the hole for D/P of 0.4, with the center being the region of highest electric field and Raman intensity. The compelling experimental evidence and FDTD simulations offer an overall understanding of the plasmonic properties of nanohole arrays as SERS and SPR sensors, which is of significant value in advancing the diversity of applications from such surfaces.
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Affiliation(s)
- Debby Correia-Ledo
- Department of Chemistry, Universite de Montreal, C.P. 6128 Succ. Centre-Ville, Montreal, Quebec (Canada), H3C 3J7
| | - Kirsty F. Gibson
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow (United Kingdom), G1 1XL
| | - Anuj Dhawan
- Department of Electrical Engineering, Indian Institute of Technology-Delhi, New Delhi (India) 110016
- Department of Biomedical Engineering, Duke University, Durham, North Carolina (USA), 27708
- Fitzpatrick Institute for Photonics, Duke University, Durham, North Caroline (USA), 27708-0281
| | - Maxime Couture
- Department of Chemistry, Universite de Montreal, C.P. 6128 Succ. Centre-Ville, Montreal, Quebec (Canada), H3C 3J7
| | - Tuan Vo-Dinh
- Department of Biomedical Engineering, Duke University, Durham, North Carolina (USA), 27708
- Fitzpatrick Institute for Photonics, Duke University, Durham, North Caroline (USA), 27708-0281
- Department of Chemistry, Duke University, Durham, NC (USA), 27708
| | - Duncan Graham
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow (United Kingdom), G1 1XL
| | - Jean-Francois Masson
- Department of Chemistry, Universite de Montreal, C.P. 6128 Succ. Centre-Ville, Montreal, Quebec (Canada), H3C 3J7
- Centre for self-assembled chemical structures (CSACS)
- To whom correspondence should be addressed: ; Tel: +1-514-343-7342; Fax: +1-514-343-7586
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1855
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Yigit MV, Medarova Z. In vivo and ex vivo applications of gold nanoparticles for biomedical SERS imagingi. Am J Nucl Med Mol Imaging 2012; 2:232-241. [PMID: 23133814 PMCID: PMC3477733] [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] [Grants] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 03/10/2012] [Indexed: 06/01/2023]
Abstract
Surface enhanced Raman scattering (SERS) is a signal-increasing phenomenon that occurs whenever Raman scattering on a metal surface is enhanced many orders of magnitude. Recently SERS has received considerable attention due to its ultrasensitive multiplex imaging capability with strong photostability. It provides rich molecular information on any Raman molecule adsorbed to rough metal surfaces. The signal enhancement is so remarkable that identification of a single molecule is possible. SERS has become a genuine molecular imaging technique. Gold nanoparticles, encoded with Raman reporters, provide a SERS signal and have been used as imaging probes, often referred to as SERS nanoparticles. They have been used for molecular imaging in vivo, ex vivo and in vitro. Detection of picomolar concentrations of target molecules has been achieved by functionalizing the nanoparticles with target recognition ligands. This review focuses on recent achievements in utilizing SERS nanoparticles for in vivo molecular imaging. In the near future, SERS technology may allow detection of disease markers at the single cell level.
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Affiliation(s)
- Mehmet V Yigit
- Molecular Imaging Laboratory, Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School Charlestown, MA 02129
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1856
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Ansar SM, Li X, Zou S, Zhang D. Quantitative Comparison of Raman Activities, SERS Activities, and SERS Enhancement Factors of Organothiols: Implication to Chemical Enhancement. J Phys Chem Lett 2012; 3:560-5. [PMID: 26699076 DOI: 10.1021/jz2016439] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [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: 05/23/2023]
Abstract
Studying the correlation between the molecular structures of SERS-active analytes and their SERS enhancement factors is important to our fundamental understanding of SERS chemical enhancement. Using a common internal reference method, we quantitatively compared the Raman activities, SERS activities, and SERS enhancement factors for a series of organothiols that differ significantly in their structural characteristics and reported chemical enhancements. We find that while the tested molecules vary tremendously in their normal Raman and SERS activities (by more than 4 orders of magnitude), their SERS enhancement factors are very similar (the largest difference is less than 1 order of magnitude). This result strongly suggests that SERS chemical enhancement factors are not as diverse as initially believed. In addition to shedding critical insight on the SERS phenomena, the common internal reference method developed in this work provides a simple and reliable way for systematic investigation of the correlation between molecular structures and their normal Raman and SERS activities.
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Affiliation(s)
- Siyam M Ansar
- Department of Chemistry, Mississippi State University , Mississippi State, Mississippi 39762, United States
| | - Xiaoxia Li
- Department of Sciences and Mathematics, Mississippi University for Women , Columbus, Mississippi 39701, United States
| | - Shengli Zou
- Department of Chemistry, University of Central Florida , Orlando, Florida 32816, United States
| | - Dongmao Zhang
- Department of Chemistry, Mississippi State University , Mississippi State, Mississippi 39762, United States
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1857
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Zhou Q, Zhang X, Huang Y, Li Z, Zhang Z. Rapid detection of polychlorinated biphenyls at trace levels in real environmental samples by surface-enhanced Raman scattering. Sensors (Basel) 2012; 11:10851-8. [PMID: 22346675 PMCID: PMC3274317 DOI: 10.3390/s111110851] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Revised: 11/08/2011] [Accepted: 11/09/2011] [Indexed: 11/17/2022]
Abstract
Detection of trace levels of persistent pollutants in the environment is difficult but significant. Organic pollutant homologues, due to their similar physical and chemical properties, are even more difficult to distinguish, especially in trace amounts. We report here a simple method to detect polychlorinated biphenyls (PCBs) in soil and distilled spirit samples by the surface-enhanced Raman scattering technique using Ag nanorod arrays as substrates. By this method, polychlorinated biphenyls can be detected to a concentration of 5 μg/g in dry soil samples within 1 minute. Furthermore, based on simulation and understanding of the Raman characteristics of PCBs, we recognized homologues of tetrachlorobiphenyl by using the surface-enhance Raman scattering method even in trace amounts in acetone solutions, and their characteristic Raman peaks still can be distinguished at a concentration of 10−6 mol/L. This study provides a fast, simple and sensitive method for the detection and recognition of organic pollutants such as polychlorinated biphenyls.
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Affiliation(s)
- Qin Zhou
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China; E-Mails: (Q.Z.); (X.Z.); (Y.H.); (Z.L.)
- Institute of Nuclear and New Energy Technology, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China
| | - Xian Zhang
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China; E-Mails: (Q.Z.); (X.Z.); (Y.H.); (Z.L.)
| | - Yu Huang
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China; E-Mails: (Q.Z.); (X.Z.); (Y.H.); (Z.L.)
| | - Zhengcao Li
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China; E-Mails: (Q.Z.); (X.Z.); (Y.H.); (Z.L.)
| | - Zhengjun Zhang
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China; E-Mails: (Q.Z.); (X.Z.); (Y.H.); (Z.L.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +86-010-6279-7033; Fax: +86-010-6277-1160
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1858
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Abstract
Post-translational modifications of DNA- changes in the chemical structure of individual bases that occur without changes in the DNA sequence- are known to alter gene expression. They are believed to result in frequently deleterious phenotypic changes, such as cancer. Methylation of adenine, methylation and hydroxymethylation of cytosine, and guanine oxidation are the primary DNA base modifications identified to date. Here we show it is possible to use surface enhanced Raman spectroscopy (SERS) to detect these primary DNA base modifications. SERS detection of modified DNA bases is label-free and requires minimal additional sample preparation, reducing the possibility of additional chemical modifications induced prior to measurement. This approach shows the feasibility of DNA base modification assessment as a potentially routine analysis that may be further developed for clinical diagnostics.
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Affiliation(s)
- Aoune Barhoumi
- Department of Chemistry, Rice University, Houston, TX 77005 (USA)
| | - Naomi J. Halas
- Department of Chemistry, Rice University, Houston, TX 77005 (USA)
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005 (USA)
- Department of Bioengineering, Rice University, Houston, TX 77005 (USA)
- Corresponding Author PHONE: (713) 348-5611; Fax: (+1)713-348-5686
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1859
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Abstract
In this paper, a new method of one-pot biosynthesizing of gold nanoparticles (GNPs), using chloroplasts as reductants and stabilizers is reported. The as-prepared GNPs were characterized by ultraviolet visible spectroscopy, transmission electron microscopy, X-ray powder diffraction, and Fourier transform infrared spectroscopy (FTIR). The cytotoxicity of the GNPs was evaluated using the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method against gastric mucous cell line GES-1 and gastric cancer cell line MGC-803. Rhodamine 6G as a Raman probe was used for investigating surface-enhanced Raman spectroscopy (SERS) enhancement of GNPs. The transmission electron microscopy results indicated that the GNPs were spherical in structure and almost 20 nm in diameter. Ultraviolet visible spectroscopy exhibited an absorption peak at 545 nm. The GNPs exhibited high crystallinity, with the (111) plane as the predominant orientation, clarified by X-ray powder diffraction. In addition, a potential mechanism was proposed to interpret the formation process of GNPs, mainly based on the analysis of FTIR results. The FTIR spectrum confirmed that the GNPs were carried with N-H groups. Toxicological assays of as-prepared GNPs revealed that the green GNPs were nontoxic. SERS analysis revealed that the GNPs without any treatment could substantially enhance the Raman signals of rhodamine 6G. The Raman enhancement factor was calculated to be nearly 10(10) orders of magnitude. In conclusion, the GNPs with good biocompatibility and excellent SERS effect were successfully synthesized using chloroplasts. These biogenetic GNPs have great potential for ultrasensitive detection of biomarkers in vitro and in vivo based on SERS.
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Affiliation(s)
- Yi Xia Zhang
- Department of Bio-Nano-Science and Engineering, National Key Laboratory of Nano/Micro Fabrication Technology, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
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1860
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Paxton WF, Kleinman SL, Basuray AN, Stoddart JF, Van Duyne RP. Surface-Enhanced Raman Spectroelectrochemistry of TTF-Modified Self-Assembled Monolayers. J Phys Chem Lett 2011; 2:1145-1149. [PMID: 26295317 DOI: 10.1021/jz200523q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [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: 06/04/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) was used to monitor the response of a self-assembled monolayer (SAM) of a tetrathiafulvalene (TTF) derivative on a gold film-over-nanosphere electrode. The electrochemical response observed was rationalized in terms of the interactions between TTF moieties as the oxidation state was changed. Electrochemical oxidation to form the monocation caused the absorbance of the TTF unit to coincide with both the laser excitation wavelength and the localized surface plasmon resonance (LSPR), resulting in surface-enhanced resonance Raman scattering (SERRS). The vibrational frequency changes that accompany electron transfer afford a high-contrast mechanism that can be used to determine the oxidation state of the TTF unit in an unambiguous manner.
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Affiliation(s)
- Walter F Paxton
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Samuel L Kleinman
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Ashish N Basuray
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - J Fraser Stoddart
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Richard P Van Duyne
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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1861
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Abstract
Surface-enhanced Raman spectroscopy (SERS) and femtosecond stimulated Raman spectroscopy (FSRS) have revolutionized the Raman spectroscopy field. SERS provides spectroscopic detection of single molecules, and FSRS enables the acquisition of Raman spectra on the ultrafast time scale of molecular motion. Here, we present the first successful combination of these two techniques, demonstrating surface-enhanced femtosecond stimulated Raman spectroscopy (SE-FSRS) using gold nanoantennas with embedded reporter molecules. Using a picosecond Raman and femtosecond probe pulse, the time- and ensemble-averaged enhancement factor is estimated to be in the range of 10(4)-10(6). We report the line shapes, power dependence, and magnitude of the SE-FSRS signal and discuss contributions to sample degradation on the minute time scale. With these first successful proof-of-principle experiments, time-resolved SE-FSRS techniques can now be rationally attempted with the goals of investigating the dynamics of plasmonic materials as well as examining the contributions of environmental heterogeneities by probing more homogeneous molecular subsets.
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Affiliation(s)
- Renee R Frontiera
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Anne-Isabelle Henry
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Natalie L Gruenke
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Richard P Van Duyne
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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1862
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Vo-Dinh T, Dhawan A, Norton SJ, Khoury CG, Wang HN, Misra V, Gerhold MD. Plasmonic Nanoparticles and Nanowires: Design, Fabrication and Application in Sensing. J Phys Chem C Nanomater Interfaces 2010; 114:7480-7488. [PMID: 24839505 PMCID: PMC4022305 DOI: 10.1021/jp911355q] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study involves two aspects of our investigations of plasmonics-active systems: (i) theoretical and simulation studies and (ii) experimental fabrication of plasmonics-active nanostructures. Two types of nanostructures are selected as the model systems for their unique plasmonics properties: (1) nanoparticles and (2) nanowires on substrate. Special focus is devoted to regions where the electromagnetic field is strongly concentrated by the metallic nanostructures or between nanostructures. The theoretical investigations deal with dimers of nanoparticles and nanoshells using a semi-analytical method based on a multipole expansion (ME) and the finite-element method (FEM) in order to determine the electromagnetic enhancement, especially at the interface areas of two adjacent nanoparticles. The experimental study involves the design of plasmonics-active nanowire arrays on substrates that can provide efficient electromagnetic enhancement in regions around and between the nanostructures. Fabrication of these nanowire structures over large chip-scale areas (from a few millimeters to a few centimeters) as well as FDTD simulations to estimate the EM fields between the nanowires are described. The application of these nanowire chips using surface-enhanced Raman scattering (SERS) for detection of chemicals and labeled DNA molecules is described to illustrate the potential of the plasmonics chips for sensing.
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Affiliation(s)
- Tuan Vo-Dinh
- Fitzpatrick Institute for Photonics, Departments of Biomedical Engineering and Chemistry, Duke University, Durham, NC 27708, USA
| | - Anuj Dhawan
- Fitzpatrick Institute for Photonics, Departments of Biomedical Engineering and Chemistry, Duke University, Durham, NC 27708, USA
| | - Stephen J. Norton
- Fitzpatrick Institute for Photonics, Departments of Biomedical Engineering and Chemistry, Duke University, Durham, NC 27708, USA
| | - Christopher G. Khoury
- Fitzpatrick Institute for Photonics, Departments of Biomedical Engineering and Chemistry, Duke University, Durham, NC 27708, USA
| | - Hsin-Neng Wang
- Fitzpatrick Institute for Photonics, Departments of Biomedical Engineering and Chemistry, Duke University, Durham, NC 27708, USA
| | - Veena Misra
- Department of Electrical and Computer Engineering, NC State University, Raleigh, NC 27606, USA
| | - Michael D. Gerhold
- Electronics Division, US Army Research Office, Research Triangle Park, Durham, NC 27703, USA
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1863
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Pazos-Pérez N, Barbosa S, Rodríguez-Lorenzo L, Aldeanueva-Potel P, Pérez-Juste J, Pastoriza-Santos I, Alvarez-Puebla RA, Liz-Marzán LM. Growth of Sharp Tips on Gold Nanowires Leads to Increased Surface-Enhanced Raman Scattering Activity. J Phys Chem Lett 2010; 1:24-7. [PMID: 26700846 DOI: 10.1021/jz900004h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [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: 05/21/2023]
Abstract
We report the formation of gold nanoparticles with a novel and useful morphology, comprising nanowires fully covered with sharp tips (thorned nanowires). The synthesis is based on a seeded-growth approach based the rapid overgrowth of ultrathin gold wires in N,N-dimethylformamide, in the presence of poly(vinylpyrrolidone). The process allows a fine control over the thickness of the final wires, as well as the tunability of the number and sharpness of the thorns. These new plasmonic nanostructures display extremely strong optical enhancing properties and can be readily used as platforms for SERS and for integration in ultrasensitive optical devices.
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Affiliation(s)
- Nicolás Pazos-Pérez
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Silvia Barbosa
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Laura Rodríguez-Lorenzo
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Paula Aldeanueva-Potel
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Jorge Pérez-Juste
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Isabel Pastoriza-Santos
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Ramón A Alvarez-Puebla
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Luis M Liz-Marzán
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
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1864
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Pazos-Pérez N, Barbosa S, Rodríguez-Lorenzo L, Aldeanueva-Potel P, Pérez-Juste J, Pastoriza-Santos I, Alvarez-Puebla RA, Liz-Marzán LM. Growth of Sharp Tips on Gold Nanowires Leads to Increased Surface-Enhanced Raman Scattering Activity. J Phys Chem Lett 2010; 1:24-27. [PMID: 26700846 DOI: 10.1021/jz100820m] [Citation(s) in RCA: 177] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We report the formation of gold nanoparticles with a novel and useful morphology, comprising nanowires fully covered with sharp tips (thorned nanowires). The synthesis is based on a seeded-growth approach based the rapid overgrowth of ultrathin gold wires in N,N-dimethylformamide, in the presence of poly(vinylpyrrolidone). The process allows a fine control over the thickness of the final wires, as well as the tunability of the number and sharpness of the thorns. These new plasmonic nanostructures display extremely strong optical enhancing properties and can be readily used as platforms for SERS and for integration in ultrasensitive optical devices.
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Affiliation(s)
- Nicolás Pazos-Pérez
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Silvia Barbosa
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Laura Rodríguez-Lorenzo
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Paula Aldeanueva-Potel
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Jorge Pérez-Juste
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Isabel Pastoriza-Santos
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Ramón A Alvarez-Puebla
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
| | - Luis M Liz-Marzán
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
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1865
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Abstract
Nanoparticle sensors have been developed for real-time imaging and dynamic monitoring, both in live cells and in vivo, of molecular and ionic components, constructs, forces, and dynamics observed during biological, chemical, and physical processes. With their biocompatible small size and inert matrix, nanoparticle sensors have been successfully applied to noninvasive real-time measurements of analytes and fields in cells and in rodents, with spatial, temporal, physical, and chemical resolution. This review describes the diverse designs of nanoparticle sensors for ions and small molecules, physical fields, and biological features, as well as the characterization, properties, and applications of these nanosensors to in vitro and in vivo measurements. Their floating as well as localization abilities in biological media are captured by the acronym PEBBLE: photonic explorer for bioanalysis with biologically localized embedding.
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Affiliation(s)
- Yong-Eun Koo Lee
- University of Michigan, Department of Chemistry, 930 N. University, Ann Arbor, MI 48109-1055
| | - Raoul Kopelman
- University of Michigan, Department of Chemistry, 930 N. University, Ann Arbor, MI 48109-1055
| | - Ron Smith
- University of Michigan, Department of Chemistry, 930 N. University, Ann Arbor, MI 48109-1055
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