1
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Liao S, Zhu Y, Ye Q, Sanders S, Yang J, Alabastri A, Natelson D. Quantifying Efficiency of Remote Excitation for Surface-Enhanced Raman Spectroscopy in Molecular Junctions. J Phys Chem Lett 2023; 14:7574-7580. [PMID: 37589653 DOI: 10.1021/acs.jpclett.3c01948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is enabled by local surface plasmon resonances (LSPRs) in metallic nanogaps. When SERS is excited by direct illumination of the nanogap, the background heating of the lattice and electrons can prevent further manipulation of the molecules. To overcome this issue, we report SERS in electromigrated gold molecular junctions excited remotely: surface plasmon polaritons (SPPs) are excited at nearby gratings, propagate to the junction, and couple to the local nanogap plasmon modes. Like direct excitation, remote excitation of the nanogap can generate both SERS emission and an open-circuit photovoltage (OCPV). We compare the SERS intensity and the OCPV in both direct and remote illumination configurations. SERS spectra obtained by remote excitation are much more stable than those obtained through direct excitation when the photon count rates are comparable. By statistical analysis of 33 devices, the coupling efficiency of remote excitation is calculated to be around 10%, consistent with the simulated energy flow.
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Affiliation(s)
- Shusen Liao
- Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States
| | - Yunxuan Zhu
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States
| | - Qian Ye
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States
| | - Stephen Sanders
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
| | - Jiawei Yang
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States
| | - Alessandro Alabastri
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
| | - Douglas Natelson
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
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2
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Oliveira de Souza D, Girardon JS, Hoffmann DJ, Berrier E. Dynamics of Citrate Coordination on Gold Nanoparticles Under Low Specific Power Laser-Induced Heating. Chemphyschem 2022; 24:e202200744. [PMID: 36495221 DOI: 10.1002/cphc.202200744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022]
Abstract
SERS evolution recorded over a drop-coated coffee-ring pattern of citrate-capped gold colloids was investigated as a function of time under low-specific laser power. Spectral changes caused by plasmon-induced reaction could not be detected, but a long-term transient original spectral profile showing additional lines was observed. We performed deep qualitative and quantitative SERS intensity variation analysis based on the complementary use of extreme deviation and cross-correlation statistics, which provided further insights on the behavior of citrate-capping layers of gold nanoparticles upon laser illumination. More precisely, the cross-correlation analysis made possible to follow the so-called individual events denoting particular resonance structures, in which groups of modes were assigned to an evolution of citrate coordination on gold surface driven by photo-activation. As a consequence, the detection limit was increased and new lines were related to the presence of a very low amount of dicarboxy-acetone (DCA), which was already present in the system.
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Affiliation(s)
| | | | - David J Hoffmann
- Electrical Engineering Department, Federal University of Espírito Santo (UFES), Vitória, ES, Brazil
| | - Elise Berrier
- Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois - UCCS, Lille, France
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3
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Enhanced charge-transfer induced by conduction band electrons in aluminum-doped zinc oxide/molecule/Ag sandwich structures observed by surface-enhanced Raman spectroscopy. J Colloid Interface Sci 2021; 610:164-172. [PMID: 34923264 DOI: 10.1016/j.jcis.2021.12.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/03/2021] [Accepted: 12/04/2021] [Indexed: 11/21/2022]
Abstract
In the semiconductor/molecule/metal system, enhancing the efficiency of the charge-transfer (CT) plays a pivotal role in improving the sensitivity of semiconductor-based surface-enhanced Raman scattering (SERS). In this work, use of SERS for detection of an enhanced CT in a chemically-etched Al-doped ZnO (AZO), 4-mercaptopyridine (MPy) molecule, and Ag nanoparticles (NPs) (AZO/MPy/Ag) sandwich structure is reported. A series of CT routes are proposed in the energy level diagram of AZO/MPy/Ag assemblies under the excitation line at 633 nm. Very interestingly, for the first of its kind, a significant CT route from the conduction band (CB) of AZO to the lowest unoccupied molecular orbital (LUMO) of MPy molecule is detected. This route can remarkably improve the degree of CT in the AZO/MPy/Ag system by about 48% compared with that of the ZnO/MPy/Ag system. Furthermore, the uniquely enhanced CT route is also further confirmed by alternative probe molecules like p-aminothiophenol (PATP) and 4-mercaptobenzoic acid (MBA). The discovery of this extra CT route will inevitably play an irreplaceable role in SERS enhancement through its participating in the CT enhancement mechanism.
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4
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Bido AT, Nordberg BG, Engevik MA, Lindquist NC, Brolo AG. High-Speed Fluctuations in Surface-Enhanced Raman Scattering Intensities from Various Nanostructures. APPLIED SPECTROSCOPY 2020; 74:1398-1406. [PMID: 32677843 DOI: 10.1177/0003702820940391] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The observation of single molecule events using surface-enhanced Raman scattering (SERS) is a well-established phenomenon. These events are characterized by strong fluctuations in SERS intensities. High-speed SERS intensity fluctuations (in the microsecond time scale) have been reported for experiments involving single metallic particles. In this work, the high-speed SERS behavior of six different types of nanostructured metal systems (Ag nanoshells, Ag nanostars, Ag aggregated spheres, Au aggregated spheres, particle-on-mirror, and Ag deposited on microspheres) was investigated. All systems demonstrated high-speed SERS intensity fluctuations. Statistical analysis of the duration of the SERS fluctuations yielded tailed distributions with average event durations around 100 μs. Although the characteristics of the fluctuations seem to be random, the results suggest interesting differences between the system that might be associated with the strength distribution and density of the localized SERS hotspots. For instance, systems with more localized fields, such as nanostars, present faster fluctuation bursts compared to metallic aggregates that support spread-out fields. The results presented here appear to confirm that high-speed SERS intensity fluctuations are a fundamental characteristic of the SERS effect.
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Affiliation(s)
- Ariadne T Bido
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, Canada
| | - Britta G Nordberg
- Department of Physics and Engineering, Bethel University, St. Paul, MN, USA
| | - Marit A Engevik
- Department of Physics and Engineering, Bethel University, St. Paul, MN, USA
| | - Nathan C Lindquist
- Department of Physics and Engineering, Bethel University, St. Paul, MN, USA
| | - Alexandre G Brolo
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, Canada
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5
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Sukmanee T, Wongravee K, Kitahama Y, Ekgasit S, Itoh T, Pienpinijtham P, Ozaki Y. Distinguishing Enantiomers by Tip‐Enhanced Raman Scattering: Chemically Modified Silver Tip with an Asymmetric Atomic Arrangement. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Thanyada Sukmanee
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Kanet Wongravee
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Yasutaka Kitahama
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
| | - Sanong Ekgasit
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Tamitake Itoh
- National Institute of Advanced Industrial Science and Technology (AIST) Takamatsu Kagawa 761-0395 Japan
| | - Prompong Pienpinijtham
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Yukihiro Ozaki
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
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6
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Wang M, Li M, Jiang S, Gao J, Xi P. Plasmonics meets super-resolution microscopy in biology. Micron 2020; 137:102916. [PMID: 32688264 DOI: 10.1016/j.micron.2020.102916] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/15/2020] [Accepted: 07/09/2020] [Indexed: 12/21/2022]
Abstract
Super-resolution microscopy can reveal the subtle biological processes hidden behind the optical diffraction barrier. Plasmonics is a key nanophotonic that combines electronics and photonics through the interaction of light with the metallic nanostructure. In this review, we survey the recent progresses on plasmonic-assisted super-resolution microscopy. The strong electromagnetic field enhancement trapped near metallic nanostructures offers a unique opportunity to manipulate the illumination scheme for overcoming the diffraction limit. Plasmonic nanoprobes, exploited as surface-enhanced Raman scattering (SERS) and plasmon-enhanced fluorescence nanoparticles, are a major category of contrast agent in super-resolution microscopy. The outstanding challenges, future developments, and potential biological applications are also discussed.
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Affiliation(s)
- Miaoyan Wang
- Department of Biomedical Engineering, College of Engineering, Peking University, 100871 Beijing, China
| | - Meiqi Li
- Department of Biomedical Engineering, College of Engineering, Peking University, 100871 Beijing, China
| | - Shan Jiang
- Department of Biomedical Engineering, College of Engineering, Peking University, 100871 Beijing, China
| | - Juntao Gao
- MOE Key Laboratory of Bioinformatics, Bioinformatics Division, Center for Synthetic & Systems Biology, BNRist, Center for Synthetic & Systems Biology, Tsinghua University, 100084 Beijing, China; Department of Automation, Tsinghua University, 100084 Beijing, China
| | - Peng Xi
- Department of Biomedical Engineering, College of Engineering, Peking University, 100871 Beijing, China.
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7
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Divya KV, Abraham KE. Ag nanoparticle decorated Sb2O3 thin film: synthesis, characterizations and application. NANO EXPRESS 2020. [DOI: 10.1088/2632-959x/aba103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Abstract
The property modifications in a thin film when its surface undergoes a nanoparticle decoration process in addition to its surface nanostructuring are investigated this paper. In specific, it describes the property modifications of antimony trioxide and its annealed variant, when their surface is decorated with Ag nanoparticles. Along with the modifications brought to the thin films, the morphology variations or agglomeration effects happening to Ag nanoparticles through/after this decoration process is also discussed here. We observe a mutual tuning of morphology as well as properties of thin film and nanoparticles. A fractal like cluster formation of Ag nanoparticle on the surface of nanostructured Sb2O3 thin film was witnessed. Whereas on the surfaces of Sb2O3 (annealed) thin film and glass plate, clustering of Ag nanoparticle is found to be different. On annealed Sb2O3 thin film surface, instead of forming fractal clusters most of the Ag nanoparticles fill in the voids between the thorns like structure of the film. The surface modification highly influences the optical absorption as well as the hydrophilicity of antimony trioxide samples. Due to the introduction of Ag nanoparticle, the absorption of Sb2O3 thin film in the visible region increased. All the synthesized films have roughness coefficient >1 and all are hydrophilic in nature. Nano structured Sb2O3 thin film is extremely hydrophilic and they become hydrophilic due to the introduction of Ag nanoparticle. The filling of Ag nanoparticles in the voids between the thorn structures might have prevented the water droplet penetration into these voids. Consequently, a partial wetting occurs on the film surface. High SERS efficiency factor (EF) and good reproducibility of Ag/Sb2O3/Glass make it a good candidate for SERS application.
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8
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Sukmanee T, Wongravee K, Kitahama Y, Ekgasit S, Itoh T, Pienpinijtham P, Ozaki Y. Distinguishing Enantiomers by Tip‐Enhanced Raman Scattering: Chemically Modified Silver Tip with an Asymmetric Atomic Arrangement. Angew Chem Int Ed Engl 2020; 59:14564-14569. [DOI: 10.1002/anie.202005446] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/27/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Thanyada Sukmanee
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Kanet Wongravee
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Yasutaka Kitahama
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
| | - Sanong Ekgasit
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Tamitake Itoh
- National Institute of Advanced Industrial Science and Technology (AIST) Takamatsu Kagawa 761-0395 Japan
| | - Prompong Pienpinijtham
- Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials Faculty of Science Chulalongkorn University 254 Phayathai Rd., Pathumwan Bangkok 10330 Thailand
| | - Yukihiro Ozaki
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
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9
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Li A, Yu J, Lin J, Chen M, Wang X, Guo L. Increased O 2p State Density Enabling Significant Photoinduced Charge Transfer for Surface-Enhanced Raman Scattering of Amorphous Zn(OH) 2. J Phys Chem Lett 2020; 11:1859-1866. [PMID: 32068408 DOI: 10.1021/acs.jpclett.0c00187] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Enriching the electronic density of states (DOS) of semiconductors is the key to promoting charge transfer (CT) and achieving a large surface-enhanced Raman scattering (SERS) enhancement. Metal hydroxide semiconductors are anticipated to exhibit DOS that are higher than those of metal oxide because of their abundant O atoms; however, their SERS activity has not been verified. Here, combining density functional theory and experiments, we report a SERS sensitivity of amorphous Zn(OH)2 [a-Zn(OH)2] that is much higher than that of amorphous ZnO (a-ZnO), ascribed to the abundant O atoms and hence enriched O 2p state density near the Fermi level in a-Zn(OH)2, which gives rise to higher CT probabilities. Moreover, we find a-Zn(OH)2 exhibits significant advantages in energy-level matching over a-ZnO for efficient photoinduced CT via strong vibronic coupling, ascribed to the upshifted valence band maximum and the narrower band gap of a-Zn(OH)2. Via the synthesis of a-Zn(OH)2 nanocages, an ultrahigh enhancement factor of 1.29 × 106 is obtained in semiconductor-based SERS.
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Affiliation(s)
- Anran Li
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Jian Yu
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Jie Lin
- Cixi Institute of Biomedical Engineering, Chinese Academy of Science (CAS) Key Laboratory of Magnetic Materials and Devices and Key Laboratory of Additive Manufacturing Materials of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo 315201, P. R. China
| | - Mo Chen
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Xiaotian Wang
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Lin Guo
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Chemistry, Beihang University, Beijing 100191, P. R. China
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10
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Juneja S, Bhattacharya J. Biosynthetically grown dendritic silver nanostructures for visible Surface Enhanced Resonance Raman Spectroscopy (v-SERRS). NEW J CHEM 2020. [DOI: 10.1039/d0nj03040f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple approach to achieve high SERS enhancement for bio-analyte detection at visible wavelength through a resonance Raman (RR) effect has been proposed in this study.
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Affiliation(s)
- Subhavna Juneja
- NanoBiotechnology Lab, School of Biotechnology
- Jawaharlal Nehru University
- India
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11
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Guo J, Yan L, Geng J, Zhu G, Han GZ. In-Situ covalent synthesis of gold nanorods on GO surface as ultrasensitive Raman probe. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jian Guo
- College of Chemistry and Molecular Engineering; Nanjing Tech University; Nanjing 210009 China
| | - Li Yan
- College of Chemistry and Molecular Engineering; Nanjing Tech University; Nanjing 210009 China
| | - Jian Geng
- College of Chemistry and Molecular Engineering; Nanjing Tech University; Nanjing 210009 China
| | - Geng Zhu
- College of Chemistry and Molecular Engineering; Nanjing Tech University; Nanjing 210009 China
| | - Guo-Zhi Han
- College of Chemistry and Molecular Engineering; Nanjing Tech University; Nanjing 210009 China
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12
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Wang X, Shi W, Wang S, Zhao H, Lin J, Yang Z, Chen M, Guo L. Two-Dimensional Amorphous TiO2 Nanosheets Enabling High-Efficiency Photoinduced Charge Transfer for Excellent SERS Activity. J Am Chem Soc 2019; 141:5856-5862. [DOI: 10.1021/jacs.9b00029] [Citation(s) in RCA: 200] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Xiaotian Wang
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Wenxiong Shi
- School of Material Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, 300387 Tianjin, P. R. China
| | - Shaoxiong Wang
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Hewei Zhao
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Jie Lin
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Zhao Yang
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Mo Chen
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
| | - Lin Guo
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, 100191 Beijing, P. R. China
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13
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Haran G, Chuntonov L. Artificial Plasmonic Molecules and Their Interaction with Real Molecules. Chem Rev 2018; 118:5539-5580. [DOI: 10.1021/acs.chemrev.7b00647] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Gilad Haran
- Chemical and Biological Physics Department, Weizmann Institute of Science, Rehovot 760001, Israel
| | - Lev Chuntonov
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology, Haifa 3200008, Israel
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14
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Abstract
Chemical activity of single nanoparticles can be imaged and determined by monitoring the optical signal of each individual during chemical reactions with advanced optical microscopes. It allows for clarifying the functional heterogeneity among individuals, and for uncovering the microscopic reaction mechanisms and kinetics that could otherwise be averaged out in ensemble measurements.
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Affiliation(s)
- Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
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15
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Su X, Ma H, Wang H, Li X, Han XX, Zhao B. Surface-enhanced Raman scattering on organic–inorganic hybrid perovskites. Chem Commun (Camb) 2018; 54:2134-2137. [DOI: 10.1039/c8cc00339d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time SERS on organic–inorganic hybrid perovskites is explored. The enhancement mechanism is discussed according to charge transfer.
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Affiliation(s)
- Xiaoyue Su
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Hao Ma
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
| | - He Wang
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Xueliang Li
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Xiao Xia Han
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- People's Republic of China
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16
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Wattanavichean N, Casey E, Nichols RJ, Arnolds H. Discrimination between hydrogen bonding and protonation in the spectra of a surface-enhanced Raman sensor. Phys Chem Chem Phys 2018; 20:866-871. [PMID: 29238769 DOI: 10.1039/c7cp06943j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Adsorbed mercaptopyridine can sense hydrogen-bonding because the ring breathing mode has a different frequency from bare and protonated species.
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Affiliation(s)
| | - Ella Casey
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | | | - Heike Arnolds
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
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17
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Marshall ARL, Stokes J, Viscomi FN, Proctor JE, Gierschner J, Bouillard JSG, Adawi AM. Determining molecular orientation via single molecule SERS in a plasmonic nano-gap. NANOSCALE 2017; 9:17415-17421. [PMID: 29104980 DOI: 10.1039/c7nr05107g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
In this work, plasmonic nano-gaps consisting of a silver nanoparticle coupled to an extended silver film have been fully optimized for single molecule Surface-Enhanced Raman Scattering (SERS) spectroscopy. The SERS signal was found to be strongly dependent on the particle size and the molecule orientation with respect to the field inside the nano-gap. Using Finite Difference Time Domain (FDTD) simulations to complement the experimental measurements, the complex interplay between the excitation enhancement and the emission enhancement of the system as a function of particle size were highlighted. Additionally, in conjunction with Density Functional Theory (DFT), the well-defined field direction in the nano-gap enables to recover the orientation of individual molecules.
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Affiliation(s)
- Addison R L Marshall
- School of Mathematics and Physical Sciences, University of Hull, Cottingham road, HU6 7RX, UK.
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18
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Wu H, Li X, Xu J, Wang C, Rong Z, Xiao R, Wang S. Study on the SERS substrate composed of Au@Ag core-shell nanoparticles linked to SiO 2 spheres. INORG NANO-MET CHEM 2017. [DOI: 10.1080/15533174.2016.1212232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Huiyun Wu
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
- Department of Science and Technology, Academy of Military Medical Sciences, Beijing, P. R. China
| | - Xin Li
- Department of Science and Technology, Academy of Military Medical Sciences, Beijing, P. R. China
| | - Jiawen Xu
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Congwen Wang
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Zhen Rong
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Rui Xiao
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Shengqi Wang
- Beijing Institute of Radiation Medicine, Beijing, P. R. China
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19
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Olson AP, Spies KB, Browning AC, Soneral PAG, Lindquist NC. Chemically imaging bacteria with super-resolution SERS on ultra-thin silver substrates. Sci Rep 2017; 7:9135. [PMID: 28831104 PMCID: PMC5567233 DOI: 10.1038/s41598-017-08915-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 07/18/2017] [Indexed: 11/10/2022] Open
Abstract
Plasmonic hotspots generate a blinking Surface Enhanced Raman Spectroscopy (SERS) effect that can be processed using Stochastic Optical Reconstruction Microscopy (STORM) algorithms for super-resolved imaging. Furthermore, by imaging through a diffraction grating, STORM algorithms can be modified to extract a full SERS spectrum, thereby capturing spectral as well as spatial content simultaneously. Here we demonstrate SERS and STORM combined in this way for super-resolved chemical imaging using an ultra-thin silver substrate. Images of gram-positive and gram-negative bacteria taken with this technique show excellent agreement with scanning electron microscope images, high spatial resolution at <50 nm, and spectral SERS content that can be correlated to different regions. This may be used to identify unique chemical signatures of various cells. Finally, because we image through as-deposited, ultra-thin silver films, this technique requires no nanofabrication beyond a single deposition and looks at the cell samples from below. This allows direct imaging of the cell/substrate interface of thick specimens or imaging samples in turbid or opaque liquids since the optical path doesn’t pass through the sample. These results show promise that super-resolution chemical imaging may be used to differentiate chemical signatures from cells and could be applied to other biological structures of interest.
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Affiliation(s)
- Aeli P Olson
- Physics Department, Bethel University, St Paul, MN, 55112, USA
| | - Kelsey B Spies
- Biology Department, Bethel University, St Paul, MN, 55112, USA
| | - Anna C Browning
- Biology Department, Bethel University, St Paul, MN, 55112, USA
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20
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Wang X, Shi W, Jin Z, Huang W, Lin J, Ma G, Li S, Guo L. Remarkable SERS Activity Observed from Amorphous ZnO Nanocages. Angew Chem Int Ed Engl 2017. [PMID: 28651039 DOI: 10.1002/anie.201705187] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Enhancement of the semiconductor-molecule interaction, in particular, promoting the interfacial charge transfer process (ICTP), is key to improving the sensitivity of semiconductor-based surface enhanced Raman scattering (SERS). Herein, by developing amorphous ZnO nanocages (a-ZnO NCs), we successfully obtained an ultrahigh enhancement factor of up to 6.62×105 . This remarkable SERS sensitivity can be attributed to high-efficiency ICTP within a-ZnO NC molecule system, which is caused by metastable electronic states of a-ZnO NCs. First-principles density functional theory (DFT) simulations further confirmed a stronger ICTP in a-ZnO NCs than in their crystalline counterparts. The efficient ICTP can even generate π bonding in Zn-S bonds peculiar to the mercapto molecule adsorbed a-ZnO NCs, which has been verified through the X-ray absorption near-edge structure (XANES) characterization. To the best of our knowledge, this is the first time such remarkable SERS activity has been observed within amorphous semiconductor nanomaterials, which could open a new frontier for developing highly sensitive and stable SERS technology.
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Affiliation(s)
- Xiaotian Wang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Wenxiong Shi
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Zhao Jin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Weifeng Huang
- College of Engineering, Peking University, 100871, Beijing, P.R. China
| | - Jie Lin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Guanshui Ma
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Shuzhou Li
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Lin Guo
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
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21
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Wang X, Shi W, Jin Z, Huang W, Lin J, Ma G, Li S, Guo L. Remarkable SERS Activity Observed from Amorphous ZnO Nanocages. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705187] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiaotian Wang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Wenxiong Shi
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
| | - Zhao Jin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Weifeng Huang
- College of EngineeringPeking University 100871 Beijing P.R. China
| | - Jie Lin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Guanshui Ma
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Shuzhou Li
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
| | - Lin Guo
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
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22
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Zrimsek AB, Chiang N, Mattei M, Zaleski S, McAnally MO, Chapman CT, Henry AI, Schatz GC, Van Duyne RP. Single-Molecule Chemistry with Surface- and Tip-Enhanced Raman Spectroscopy. Chem Rev 2016; 117:7583-7613. [PMID: 28610424 DOI: 10.1021/acs.chemrev.6b00552] [Citation(s) in RCA: 352] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Single-molecule (SM) surface-enhanced Raman spectroscopy (SERS) and tip-enhanced Raman spectroscopy (TERS) have emerged as analytical techniques for characterizing molecular systems in nanoscale environments. SERS and TERS use plasmonically enhanced Raman scattering to characterize the chemical information on single molecules. Additionally, TERS can image single molecules with subnanometer spatial resolution. In this review, we cover the development and history of SERS and TERS, including the concept of SERS hot spots and the plasmonic nanostructures necessary for SM detection, the past and current methodologies for verifying SMSERS, and investigations into understanding the signal heterogeneities observed with SMSERS. Moving on to TERS, we cover tip fabrication and the physical origins of the subnanometer spatial resolution. Then, we highlight recent advances of SMSERS and TERS in fields such as electrochemistry, catalysis, and SM electronics, which all benefit from the vibrational characterization of single molecules. SMSERS and TERS provide new insights on molecular behavior that would otherwise be obscured in an ensemble-averaged measurement.
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Affiliation(s)
- Alyssa B Zrimsek
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Naihao Chiang
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Michael Mattei
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Stephanie Zaleski
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Michael O McAnally
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Craig T Chapman
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Anne-Isabelle Henry
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - George C Schatz
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Richard P Van Duyne
- Department of Chemistry, ‡Applied Physics Program, and §Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
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23
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Wang N, Ma Z, Zhou S, Liang G. Facile fabrication of SERS substrate based on food residue eggshell membrane. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.10.077] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Wang Z. Imaging Nanotherapeutics in Inflamed Vasculature by Intravital Microscopy. Am J Cancer Res 2016; 6:2431-2438. [PMID: 27877245 PMCID: PMC5118605 DOI: 10.7150/thno.16307] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 08/04/2016] [Indexed: 12/21/2022] Open
Abstract
Intravital microscopy (IVM) is the application of light microscopy to real time study biology of live animal tissues in intact and physiological conditions with the high spatial and temporal resolution. Advances in imaging systems, genetic animal models and imaging probes, IVM has offered quantitative and dynamic insight into cell biology, immunology, neurobiology and cancer. In this review, we will focus on the targeting of nanotherapeutics to inflamed vasculature. We will introduce the basic concept and principle of IVM and demonstrate that IVM is a powerful tool used to quantitatively determine the molecular mechanisms of interactions between nanotherapeutics and neutrophils or endothelium in living mice. In the future, it is needed to develop new imaging systems and novel imaging contrast agents to better understand molecular mechanisms of tissue processing of nanotherapeutics in vivo.
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25
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Gopinath PM, Ranjani A, Dhanasekaran D, Thajuddin N, Archunan G, Akbarsha MA, Gulyás B, Padmanabhan P. Multi-functional nano silver: A novel disruptive and theranostic agent for pathogenic organisms in real-time. Sci Rep 2016; 6:34058. [PMID: 27666290 PMCID: PMC5036090 DOI: 10.1038/srep34058] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 09/06/2016] [Indexed: 01/09/2023] Open
Abstract
The present study was aimed at evaluating the fluorescence property, sporicidal potency against Bacillus and Clostridium endospores, and surface disinfecting ability of biogenic nano silver. The nano silver was synthesized using an actinobacterial cell-filtrate. The fluorescence property as well as imaging facilitator potency of this nano silver was verified adopting spectrofluorometer along with fluorescent and confocal laser scanning microscope wherein strong emission and bright green fluorescence, respectively, on the entire spore surface was observed. Subsequently, the endospores of B. subtilis, B. cereus, B. amyloliquefaciens, C. perfringens and C. difficile were treated with physical sporicides, chemical sporicides and nano silver, in which the nano silver brought about pronounced inhibition even at a very low concentration. Finally, the environmental surface-sanitizing potency of nano silver was investigated adopting cage co-contamination assay, wherein vital organs of mice exposed to the nano silver-treated cage did not show any signs of pathological lesions, thus signifying the ability of nano silver to completely disinfect the spore or reduce the count required for infection. Taken these observations together, we have shown the multi-functional biological properties of the nano silver, synthesized using an actinobacterial cell-filtrate, which could be of application in advanced diagnostics, biomedical engineering and therapeutics in the near future.
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Affiliation(s)
| | - Anandan Ranjani
- Department of Microbiology, Bharathidasan University, Tiruchirappalli-620 024, India
| | - Dharumadurai Dhanasekaran
- Department of Microbiology, Bharathidasan University, Tiruchirappalli-620 024, India
- National Centre for Alternatives to Animal Experiments (NCAAE), Bharathidasan University, Tiruchirappalli-620 024, India
| | - Nooruddin Thajuddin
- Department of Microbiology, Bharathidasan University, Tiruchirappalli-620 024, India
- National Centre for Alternatives to Animal Experiments (NCAAE), Bharathidasan University, Tiruchirappalli-620 024, India
| | - Govindaraju Archunan
- National Centre for Alternatives to Animal Experiments (NCAAE), Bharathidasan University, Tiruchirappalli-620 024, India
- Centre for Pheromone Technology, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli-620 024, India
| | - Mohammad Abdulkader Akbarsha
- National Centre for Alternatives to Animal Experiments (NCAAE), Bharathidasan University, Tiruchirappalli-620 024, India
- Department of Food Science and Nutrition, College of Food and Agriculture, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Balázs Gulyás
- Lee Kong Chian School of Medicine, Nanyang Technological University, 636921, Singapore
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26
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Sevinc PC, Dhital B, Govind Rao V, Wang Y, Lu HP. Probing Electric Field Effect on Covalent Interactions at a Molecule–Semiconductor Interface. J Am Chem Soc 2016; 138:1536-42. [PMID: 26735967 DOI: 10.1021/jacs.5b10253] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Papatya C. Sevinc
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Bharat Dhital
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Vishal Govind Rao
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Yuanmin Wang
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - H. Peter Lu
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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27
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Barik A, Cherukulappurath S, Wittenberg NJ, Johnson TW, Oh SH. Dielectrophoresis-Assisted Raman Spectroscopy of Intravesicular Analytes on Metallic Pyramids. Anal Chem 2016; 88:1704-10. [DOI: 10.1021/acs.analchem.5b03719] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Avijit Barik
- Department of Electrical
and Computer Engineering, ‡Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Sudhir Cherukulappurath
- Department of Electrical
and Computer Engineering, ‡Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Nathan J. Wittenberg
- Department of Electrical
and Computer Engineering, ‡Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy W. Johnson
- Department of Electrical
and Computer Engineering, ‡Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Sang-Hyun Oh
- Department of Electrical
and Computer Engineering, ‡Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
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28
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Zheng Y, Soeriyadi AH, Rosa L, Ng SH, Bach U, Justin Gooding J. Reversible gating of smart plasmonic molecular traps using thermoresponsive polymers for single-molecule detection. Nat Commun 2015; 6:8797. [PMID: 26549539 PMCID: PMC4667617 DOI: 10.1038/ncomms9797] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 10/05/2015] [Indexed: 11/09/2022] Open
Abstract
Single-molecule surface-enhanced Raman spectroscopy (SERS) has attracted increasing interest for chemical and biochemical sensing. Many conventional substrates have a broad distribution of SERS enhancements, which compromise reproducibility and result in slow response times for single-molecule detection. Here we report a smart plasmonic sensor that can reversibly trap a single molecule at hotspots for rapid single-molecule detection. The sensor was fabricated through electrostatic self-assembly of gold nanoparticles onto a gold/silica-coated silicon substrate, producing a high yield of uniformly distributed hotspots on the surface. The hotspots were isolated with a monolayer of a thermoresponsive polymer (poly(N-isopropylacrylamide)), which act as gates for molecular trapping at the hotspots. The sensor shows not only a good SERS reproducibility but also a capability to repetitively trap and release molecules for single-molecular sensing. The single-molecule sensitivity is experimentally verified using SERS spectral blinking and bianalyte methods.
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Affiliation(s)
- Yuanhui Zheng
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.,Australian Centre for NanoMedicine, The University of New South Wales, Sydney, New South Wales 2052, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Alexander H Soeriyadi
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.,Australian Centre for NanoMedicine, The University of New South Wales, Sydney, New South Wales 2052, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Lorenzo Rosa
- Centre for Micro-Photonics (H34), Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia.,Department of Information Engineering, University of Parma, V.le G.P. Usberti 181/A, I-43124 Parma, Italy
| | - Soon Hock Ng
- Department of Materials Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia.,The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, Victoria 3168, Australia
| | - Udo Bach
- Department of Materials Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia.,The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, Victoria 3168, Australia
| | - J Justin Gooding
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.,Australian Centre for NanoMedicine, The University of New South Wales, Sydney, New South Wales 2052, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia
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29
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Cui Q, Xia B, Mitzscherling S, Masic A, Li L, Bargheer M, Möhwald H. Preparation of gold nanostars and their study in selective catalytic reactions. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.10.028] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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30
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Sun CH, Wang ML, Feng Q, Liu W, Xu CX. Surface-enhanced Raman scattering (SERS) study on Rhodamine B adsorbed on different substrates. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2014. [DOI: 10.1134/s0036024415020338] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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van Schrojenstein Lantman EM, de Peinder P, Mank AJG, Weckhuysen BM. Separation of time-resolved phenomena in surface-enhanced Raman scattering of the photocatalytic reduction of p-nitrothiophenol. Chemphyschem 2014; 16:547-54. [PMID: 25504551 PMCID: PMC4834609 DOI: 10.1002/cphc.201402709] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Indexed: 11/05/2022]
Abstract
Straightforward analysis of chemical processes on the nanoscale is difficult, as the measurement volume is linked to a discrete number of molecules, ruling out any ensemble averaging over rotation and diffusion processes. Raman spectroscopy is sufficiently selective for monitoring chemical changes, but is not sufficiently sensitive to be applied directly. Surface-enhanced Raman spectroscopy (SERS) can be applied for studying reaction kinetics, but adds additional variability in the signal as the enhancement factor is not the same for every location. A novel chemometric method described here separates reaction kinetics from short-term variability, based on the lack of fit in a principal-component analysis. We show that it is possible to study effects that occur on different time scales independently without data reduction using the photocatalytic reduction of p-nitrothiophenol as a showcase system. Using this approach a better description of the nanoscale reaction kinetics becomes available, while the short-term variations can be examined separately to examine reorientation and/or diffusion effects. It may even be possible to identify reaction intermediates through this approach. With only a limited number of reactive molecules in the studied volume, an intermediate on a SERS hot spot may temporarily dominate the spectrum. Now such events can be easily separated from the bulk conversion process by making use of this chemometric method.
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Affiliation(s)
- E M van Schrojenstein Lantman
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht (The Netherlands)
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32
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Yang A, Bi J, Yang S, Zhang J, Chen A, Liang S. Highly surface-roughened caterpillar-like Au/Ag nanotubes for sensitive and reproducible substrates for surface enhanced Raman spectroscopy. RSC Adv 2014. [DOI: 10.1039/c4ra07971j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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33
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Chakrapani K, Sampath S. Spontaneous assembly of iridium nanochain-like structures: surface enhanced Raman scattering activity using visible light. Chem Commun (Camb) 2014; 50:3061-3. [DOI: 10.1039/c3cc49690b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A facile, environmentally friendly approach to synthesize branched Ir nanochain-like structures under mild conditions results in nanostructures that serve as active substrates for surface enhanced Raman scattering studies .
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Affiliation(s)
- Kalapu Chakrapani
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012, India
| | - S. Sampath
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012, India
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34
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Ji R, Sun W, Chu Y. One-step hydrothermal synthesis of Ag/Cu2O heterogeneous nanostructures over Cu foil and their SERS applications. RSC Adv 2014. [DOI: 10.1039/c3ra44281k] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Tang W, Chase DB, Rabolt JF. Immobilization of Gold Nanorods onto Electrospun Polycaprolactone Fibers Via Polyelectrolyte Decoration—A 3D SERS Substrate. Anal Chem 2013; 85:10702-9. [DOI: 10.1021/ac400241z] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Wenqiong Tang
- Department of Materials Science
and Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - D. Bruce Chase
- Department of Materials Science
and Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - John F. Rabolt
- Department of Materials Science
and Engineering, University of Delaware, Newark, Delaware 19716, United States
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36
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Kim J, Kang KN, Sarkar A, Malempati P, Hah D, Daniels-Race T, Feldman M. Nanorough gold for enhanced Raman scattering. JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. B, NANOTECHNOLOGY & MICROELECTRONICS : MATERIALS, PROCESSING, MEASUREMENT, & PHENOMENA : JVST B 2013; 31:6FE02. [PMID: 24353928 PMCID: PMC3829892 DOI: 10.1116/1.4826701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 10/11/2013] [Indexed: 06/03/2023]
Abstract
Conventional Raman scattering is a workhorse technique for detecting and identifying complex molecular samples. In surface enhanced Raman scattering, a nanorough metallic surface close to the sample enhances the Raman signal enormously. In this work, the surface is on a clear epoxy substrate. The epoxy is cast on a silicon wafer, using 20 nm of gold as a mold release. This single step process already produces useful enhanced Raman signals. However, the Raman signal is further enhanced by (1) depositing additional gold on the epoxy substrate and (2) by using a combination of wet and dry etches to roughen the silicon substrate before casting the epoxy. The advantage of a clear substrate is that the Raman signal may be obtained by passing light through the substrate, with opaque samples simply placed against the surface. Results were obtained with solutions of Rhodamine 6G in deionized water over a range of concentrations from 1 nM to 1 mM. In all cases, the signal to noise ratio was greater than 10:1.
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Affiliation(s)
- Jeonghwan Kim
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Kyung-Nam Kang
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Anirban Sarkar
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Pallavi Malempati
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Dooyoung Hah
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Theda Daniels-Race
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
| | - Martin Feldman
- Division of Electrical and Computer Engineering, Louisiana State University, 3104 Patrick Taylor Hall, Baton Rouge, Louisiana 70803
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37
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Tai CY, Yu WH. The contribution of nonlocal electro-opto-thermal interaction to single molecule nonlinear Raman enhancement. OPTICS EXPRESS 2013; 21:25026-25034. [PMID: 24150345 DOI: 10.1364/oe.21.025026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
we develop a precise modelling where nonlocal electro-opto-thermal interactions are comprehensively included for the analysis of nonlinear Raman enhancement and plasmonic heating. An interaction enhancement factor G(IEF) is introduced to quantify the coupling between the electromagnetic field and the temperature field which is rarely considered in the estimation of Raman enhancement. For the case of isolated single nanosphere, G(IEF) can be up to ten, indicating a thermal origin which well explains the observed temperature rise, shortened blinking period, and the nonlinearly enhanced Raman cross-section. For the case of nanodimer, the suppression of plasmon heating was analyzed, demonstrating the great capability to mitigate biomolecular degradation and blinking.
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Smith ZJ, Chang CW, Lawson LS, Lane SM, Wachsmann-Hogiu S. Precise monitoring of chemical changes through localization analysis of dynamic spectra (LADS). APPLIED SPECTROSCOPY 2013; 67:187-195. [PMID: 23622438 DOI: 10.1366/12-06770] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We present a method for monitoring subtle (sub-wavenumber) dynamics within time-varying spectra. Peak fitting is performed for large numbers of spectra in a series, allowing for monitoring time evolutions of peak positions with high precision and confidence. Sub-wavenumber peak shifts due to physical or chemical changes in the sample can be monitored and their temporal evolution characterized. In surface-enhanced Raman scattering experiments, we were able to distinguish between slow photo-damage and fast conformational change dynamics. Fluctuations in peak positions of Raman spectra recorded from a single yeast cell indicated that no significant irreversible photo-damage occurred, but these fluctuations suggest changes in the trapping conditions or biochemical changes associated with the cellular machinery in the cell. The technique is particularly suitable for applications where dynamics of spectra are of interest.
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Affiliation(s)
- Zachary J Smith
- Center for Biophotonics Science and Technology, University of California, Davis, Sacramento, CA 95817, USA
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39
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Rodrigues DC, Andrade GFS, Temperini MLA. SERS performance of gold nanotubes obtained by sputtering onto polycarbonate track-etched membranes. Phys Chem Chem Phys 2013; 15:1169-76. [DOI: 10.1039/c2cp43229c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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40
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Chakrapani K, Sampath S. Interconnected, ultrafine osmium nanoclusters: preparation and surface enhanced Raman scattering activity. Chem Commun (Camb) 2013; 49:6173-5. [DOI: 10.1039/c3cc41940a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Zhu Y, Wang D, Zhang L, Sun F, Xu J, Jiang S, Yu Q. In situ controlled growth of well-dispersed Au nanoparticles inside the channels of SBA-15 using a simple, bio-inspired method for surface-enhanced Raman spectroscopy. RSC Adv 2013. [DOI: 10.1039/c3ra41338a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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42
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Titus EJ, Weber ML, Stranahan SM, Willets KA. Super-resolution SERS imaging beyond the single-molecule limit: an isotope-edited approach. NANO LETTERS 2012; 12:5103-10. [PMID: 22978614 DOI: 10.1021/nl3017779] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Super-resolution imaging of single-molecule surface-enhanced Raman scattering (SM-SERS) reveals a spatial relationship between the SERS emission centroid and the corresponding intensity. Here, an isotope-edited bianalyte approach is used to confirm that shifts in the SERS emission centroid are directly linked to the changing position of the molecule on the nanoparticle surface. By working above the single-molecule limit and exploiting SERS intensity fluctuations, the SERS centroid positions of individual molecules are found to be spatially distinct.
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Affiliation(s)
- Eric J Titus
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Welch Hall 2.204, 105 E. 24th St. STOP A5300, Austin, Texas 78712-1224, USA
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43
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Zinc oxide nanotubes decorated with silver nanoparticles as an ultrasensitive substrate for surface-enhanced Raman scattering. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0898-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Höflich K, Becker M, Leuchs G, Christiansen S. Plasmonic dimer antennas for surface enhanced Raman scattering. NANOTECHNOLOGY 2012; 23:185303. [PMID: 22498764 DOI: 10.1088/0957-4484/23/18/185303] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Electron beam induced deposition (EBID) has recently been developed into a method to directly write optically active three-dimensional nanostructures. For this purpose a metal-organic precursor gas (here dimethyl-gold(III)-acetylacetonate) is introduced into the vacuum chamber of a scanning electron microscope where it is cracked by the focused electron beam. Upon cracking the aforementioned precursor gas, 3D deposits are realized, consisting of gold nanocrystals embedded in a carbonaceous matrix. The carbon content in the deposits hinders direct plasmonic applications. However, it is possible to activate the deposited nanostructures for plasmonics by coating the EBID structures with a continuous silver layer of a few nanometers thickness. Within this silver layer collective motions of the free electron gas can be excited. In this way, EBID structures with their intriguing precision at the nanoscale have been arranged in arrays of free-standing dimer antenna structures with nanometer sized gaps between the antennas that face each other with an angle of 90°. These dimer antenna ensembles can constitute a reproducibly manufacturable substrate for exploiting the surface enhanced Raman effect (SERS). The achieved SERS enhancement factors are of the order of 10⁴ for the incident laser light polarized along the dimer axes. To prove the signal enhancement in a Raman experiment we used the dye methyl violet as a robust test molecule. In future applications the thickness of such a silver layer on the dimer antennas can easily be varied for tuning the plasmonic resonances of the SERS substrate to match the resonance structure of the analytes to be detected.
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Affiliation(s)
- Katja Höflich
- Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany.
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45
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Stadler J, Schmid T, Zenobi R. Developments in and practical guidelines for tip-enhanced Raman spectroscopy. NANOSCALE 2012; 4:1856-1870. [PMID: 22105888 DOI: 10.1039/c1nr11143d] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This feature review provides an overview of the state-of the art and recent developments in tip-enhanced Raman spectroscopy (TERS), in-depth information about the different available types of instruments including their (dis-)advantages and capabilities as well as a short glance at a number of samples that have recently been investigated using TERS. Issues concerning the progression of TERS from point spectroscopy to an imaging technique are discussed, as well as problems arising from background and contamination signals. This review is concluded with a short TERS 'user guideline', trying to aid researchers new in the field to properly align and test their own TERS setups. Finally, a short outlook is given and some critical issues are raised that need to be solved by the community sooner or later, in order to promote TERS towards a 'push-button' operation.
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Affiliation(s)
- Johannes Stadler
- ETH Zurich, Department of Chemistry and Applied Biosciences, Wolfgang-Pauli-Strasse 10, HCI E 329, 8093 Zurich, Switzerland
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46
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Potara M, Baia M, Farcau C, Astilean S. Chitosan-coated anisotropic silver nanoparticles as a SERS substrate for single-molecule detection. NANOTECHNOLOGY 2012; 23:055501. [PMID: 22236478 DOI: 10.1088/0957-4484/23/5/055501] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a technique that has become widely used for identifying and providing structural information about molecular species in low concentration. There is an ongoing interest in finding optimum particle size, shape and spatial distribution for optimizing the SERS substrates and pushing the sensitivity toward the single-molecule detection limit. This work reports the design of a novel, biocompatible SERS substrate based on small clusters of anisotropic silver nanoparticles embedded in a film of chitosan biopolymer. The SERS efficiency of the biocompatible film is assessed by employing Raman imaging and spectroscopy of adenine, a significant biological molecule. By combining atomic force microscopy with SERS imaging we find that the chitosan matrix enables the formation of small clusters of silver nanoparticles, with junctions and gaps that greatly enhance the Raman intensities of the adsorbed molecules. The study demonstrates that chitosan-coated anisotropic silver nanoparticle clusters are sensitive enough to be implemented as effective plasmonic substrates for SERS detection of nonresonant analytes at the single-molecule level.
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Affiliation(s)
- Monica Potara
- Nanobiophotonics and Laser Microscopy Center, Interdisciplinary Research in Bio-Nano-Sciences, and Faculty of Physics, Babes-Bolyai University, Treboniu Laurian Street 42, 400271 Cluj-Napoca, Romania
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Itoh T, Iga M, Tamaru H, Yoshida KI, Biju V, Ishikawa M. Quantitative evaluation of blinking in surface enhanced resonance Raman scattering and fluorescence by electromagnetic mechanism. J Chem Phys 2012; 136:024703. [DOI: 10.1063/1.3675567] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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48
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Pan Y, Bai H, Pan L, Li Y, Tamargo MC, Sohel M, Lombardi JR. Size controlled synthesis of monodisperse PbTe quantum dots: using oleylamine as the capping ligand. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15540k] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Song W, Wang J, Mao Z, Xu W, Zhao B. Fabrication and SERS properties of Ag/Cu2S composite micro-nanostructures over Cu foil. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1247-1250. [PMID: 21571583 DOI: 10.1016/j.saa.2011.04.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 04/13/2011] [Accepted: 04/15/2011] [Indexed: 05/30/2023]
Abstract
A new kind of Ag/Cu2S composite micro/nanostructures has been prepared via a convenient galvanic reduction method. SEM images of these micro/nanostructures showed that Ag nanoparticles with the size of around 50-100 nm were well deposited on the surface of Cu2S micro/nanostructures. The SEM images also indicated that the Ag nanoparticles were preferentially grown on the big polygonal Cu2S microstructures, which could be explained by a localization of the electrons on the surface of the polygonal Cu2S microstructures after the electron transfer step. Owing to the introduction of Ag nanoparticles on the surface of Cu2S micro/nanostructures, the resulting Ag/Cu2S composite micro-nanostructures could be used as a versatile substrate for surface enhanced Raman scattering.
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Affiliation(s)
- Wei Song
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
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50
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Rapid detection of melamine with 4-mercaptopyridine-modified gold nanoparticles by surface-enhanced Raman scattering. Anal Bioanal Chem 2011; 401:333-8. [DOI: 10.1007/s00216-011-5067-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 04/21/2011] [Accepted: 04/26/2011] [Indexed: 10/18/2022]
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