1
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Huang Z, Lin X, Lu Z, Du R, Tang J, Zhou L, Zhang S. Identifying high-order plasmon modes in silver nanoparticle-over-mirror configuration. OPTICS EXPRESS 2024; 32:19746-19756. [PMID: 38859102 DOI: 10.1364/oe.522105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/16/2024] [Indexed: 06/12/2024]
Abstract
Metallic nanoparticle-over-mirror (NPOM) represents as a versatile plasmonic configuration for surface enhanced spectroscopy, sensing and light-emitting metasurfaces. However, experimentally identifying the high-order localized surface plasmon modes in NPOM, especially for the best plasmonic material silver, is often hindered by the small scattering cross-section of high-order plasmon modes and the poor reproducibility of the spectra across different NPOMs, resulted from the polyhedral morphology of the colloidal nanoparticles or the rough surface of deposited polycrystalline metals. In this study, we identify the high-order localized surface plasmon modes in silver NPOM by using differential reflection spectroscopy. We achieved reproducible single-particle absorption spectra by constructing uniform NPOM consisting of silver nanospheres, single-crystallized silver microplates, and a self-assembled monolayer of 1,10-decanedithiol. For comparison, silver NPOM created from typical polycrystalline films exhibits significant spectral fluctuations, even when employing template stripping methods to minimize the film roughness. Identifying high-order plasmon modes in the NPOM configuration offers a pathway to construct high-quality plasmonic substrates for applications such as colloidal metasurface, surface-enhanced Raman spectroscopy, fluorescence, or infrared absorption.
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2
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Liu Y, Chui KK, Fang Y, Wen S, Zhuo X, Wang J. Metal-Organic Framework-Enabled Trapping of Volatile Organic Compounds into Plasmonic Nanogaps for Surface-Enhanced Raman Scattering Detection. ACS NANO 2024; 18:11234-11244. [PMID: 38630523 PMCID: PMC11064218 DOI: 10.1021/acsnano.4c00208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/26/2024] [Accepted: 04/04/2024] [Indexed: 05/01/2024]
Abstract
Utilizing electromagnetic hotspots within plasmonic nanogaps is a promising approach to create ultrasensitive surface-enhanced Raman scattering (SERS) substrates. However, it is difficult for many molecules to get positioned in such nanogaps. Metal-organic frameworks (MOFs) are commonly used to absorb and concentrate diverse molecules. Herein, we combine these two strategies by introducing MOFs into plasmon-coupled nanogaps, which has so far remained experimentally challenging. Ultrasensitive SERS substrates are fabricated through the construction of nanoparticle-on-mirror structures, where Au nanocrystals are encapsulated with a zeolitic imidazolate framework-8 (ZIF-8) shell and then coupled to a gold film. The ZIF-8 shell, as a spacer that separates the Au nanocrystal and the Au film, can be adjusted in thickness over a wide range, which allows the electric field enhancement and plasmon resonance wavelength to be varied. By trapping Raman-active molecules within the ZIF-8 shell, we show that our plasmon-coupled structures exhibit a superior SERS detection performance. A range of volatile organic compounds at the concentrations of 10-2 mg m-3 can be detected sensitively and reliably. Our study therefore offers an attractive route for synergistically combining plasmonic electric field enhancement and MOF-enabled molecular enrichment to design and create SERS substrates for ultrasensitive detection.
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Affiliation(s)
- Yi Liu
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR 999077, China
| | - Ka Kit Chui
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR 999077, China
| | - Yini Fang
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR 999077, China
| | - Shizheng Wen
- Jiangsu
Province Key Laboratory of Modern Measurement Technology and Intelligent
Systems, School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huaian 223300, China
| | - Xiaolu Zhuo
- School
of Science and Engineering, The Chinese
University of Hong Kong (Shenzhen), Shenzhen 518172, China
| | - Jianfang Wang
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR 999077, China
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3
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Nguyen T, Chung JH, Bak GH, Kim YH, Kim M, Kim YJ, Kwon RJ, Choi EJ, Kim KH, Kim YS, Oh JW. Multiarray Biosensor for Diagnosing Lung Cancer Based on Gap Plasmonic Color Films. ACS Sens 2022; 8:167-175. [PMID: 36584356 PMCID: PMC9887647 DOI: 10.1021/acssensors.2c02001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Adaptable and sensitive materials are essential for the development of advanced sensor systems such as bio and chemical sensors. Biomaterials can be used to develop multifunctional biosensor applications using genetic engineering. In particular, a plasmonic sensor system using a coupled film nanostructure with tunable gap sizes is a potential candidate in optical sensors because of its simple fabrication, stability, extensive tuning range, and sensitivity to small changes. Although this system has shown a good ability to eliminate humidity as an interferant, its performance in real-world environments is limited by low selectivity. To overcome these issues, we demonstrated the rapid response of gap plasmonic color sensors by utilizing metal nanostructures combined with genetically engineered M13 bacteriophages to detect volatile organic compounds (VOCs) and diagnose lung cancer from breath samples. The M13 bacteriophage was chosen as a recognition element because the structural protein capsid can readily be modified to target the desired analyte. Consequently, the VOCs from various functional groups were distinguished by using a multiarray biosensor based on a gap plasmonic color film observed by hierarchical cluster analysis. Furthermore, the lung cancer breath samples collected from 70 healthy participants and 50 lung cancer patients were successfully classified with a high rate of over 89% through supporting machine learning analysis.
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Affiliation(s)
- Thanh
Mien Nguyen
- Bio-IT
Fusion Technology Research Institute, Pusan
National University, Busan 46241, Republic of Korea
| | - Jae Heun Chung
- Department
of Internal Medicine, College of Medicine, Pusan National University, Pusan National University Yangsan Hospital, Yangsan 50612, Republic of Korea
| | - Gyeong-Ha Bak
- Department
of Nano Fusion Technology, Pusan National
University, Busan 46241, Republic of Korea
| | - You Hwan Kim
- Department
of Nano Fusion Technology, Pusan National
University, Busan 46241, Republic of Korea
| | - Minjun Kim
- Department
of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Ye-Ji Kim
- Department
of Nano Fusion Technology, Pusan National
University, Busan 46241, Republic of Korea
| | - Ryuk Jun Kwon
- Family
Medicine Clinic and Research Institute of Convergence of Biomedical
Science and Technology, Pusan National University
Yangsan Hospital, Beomeo-ri, Mulgeum-eup, Yangsan, Gyeongsangnam-do 50612, Republic of Korea
| | - Eun-Jung Choi
- Bio-IT
Fusion Technology Research Institute, Pusan
National University, Busan 46241, Republic of Korea,Korea
Nanobiotechnology Center, Pusan National
University, Busan 46241, Republic of Korea
| | - Kwang Ho Kim
- School
of Materials Science and Engineering, Pusan
National University, Busan 46241, Republic of Korea,Global
Frontier Research and Development Center for Hybrid Interface Materials, Pusan National University, Busan 46241, Republic
of Korea,
| | - Yun Seong Kim
- Department
of Internal Medicine, College of Medicine, Pusan National University, Pusan National University Yangsan Hospital, Yangsan 50612, Republic of Korea,Research
Institute of Convergence Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan 50612, Republic of Korea,
| | - Jin-Woo Oh
- Bio-IT
Fusion Technology Research Institute, Pusan
National University, Busan 46241, Republic of Korea,Department
of Nano Fusion Technology, Pusan National
University, Busan 46241, Republic of Korea,Department
of Nanoenergy Engineering and Research Center for Energy Convergence
Technology, Pusan National University, Busan 46241, Republic of Korea,Korea
Nanobiotechnology Center, Pusan National
University, Busan 46241, Republic of Korea,
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4
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Carvalho DF, Martins MA, Fernandes PA, Correia MRP. Coupling of plasmonic nanoparticles on a semiconductor substrate via a modified discrete dipole approximation method. Phys Chem Chem Phys 2022; 24:19705-19715. [PMID: 35811566 DOI: 10.1039/d2cp02446b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the plasmonic coupling between a set of metallic nanoparticles (NPs) in a 2D array, and how a substrate affects such coupling, is fundamental for the development of optimized optoelectronic structures. Here, a simple semi-analytical procedure based on discrete dipole approximation (DDA) is reported to simulate the far-field and near-field properties of arrays of NPs, considering the coupling between particles, and the effect of the presence of a semiconductor substrate based on the image dipole approach. The method is validated for Ag NP dimers and single Ag NPs on a gallium nitride (GaN) substrate, a semiconductor widely used in optical devices, by comparison with the results obtained by the finite element method (FEM), indicating a good agreement in the weak coupling regime. Next, the method is applied to square and random arrays of Ag NPs on a GaN substrate. The increase in the surface density of NPs on a GaN substrate mainly results in a redshift of the dipolar resonance frequency and an increase in the near-field enhancement. This model, based on a single dipole approach, grants very low computational times, representing an advantage to predict the optical properties of large NP arrays on a semiconductor substrate for different applications.
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Affiliation(s)
- Diogo F Carvalho
- i3N, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Manuel A Martins
- CICECO, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Paulo A Fernandes
- i3N, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal. .,INL - International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal.,CIETI, Department of Physics, ISEP - Porto School of Engineering, 4200-072, Portugal
| | - M Rosário P Correia
- i3N, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal.
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5
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Rajput S, Pink D, Findlay S, Woolner E, Lewis JD, McDermott MT. Application of Surface-Enhanced Raman Spectroscopy to Guide Therapy for Advanced Prostate Cancer Patients. ACS Sens 2022; 7:827-838. [PMID: 35271265 DOI: 10.1021/acssensors.1c02551] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A critical unmet need for advanced prostate cancer (PCa) patients is optimizing systemic treatments to maximize the benefit for individuals. The response of patients with metastatic castration-resistant prostate cancer (mCRPC) to androgen receptor (AR)-directed hormonal treatments (i.e., enzalutamide and abiraterone) is mediated by the expression of a molecular variant of the androgen receptor called androgen receptor variant 7 (AR-V7). Detection and measurement of AR-V7 in mCRPC patients will lead to more informed PCa treatment. Herein, we demonstrate a quantitative nanoparticle-enhanced sandwich antibody assay for the successful ex vivo measurement of AR-V7 protein in serum from mCRPC patients. The nanoparticles are constructed as extrinsic Raman spectroscopy labels (ERLs), and surface-enhanced Raman spectroscopy (SERS) is used for assay readout. Our approach does not require specialized specimen collection materials, circulating tumor cell enrichment, or pretreatment of serum. Calibration of our assay is accomplished by expressing AR-V7 in an appropriate cell line as AR-V7 is not commercially available. We demonstrate a linear calibration curve from cell lysate and correlate lysate protein with mRNA from cultured prostate cancer cells. Finally, we demonstrate a novel pilot-scale application for clinical use by quantitatively measuring AR-V7 in serum of seven advanced PCa patients. Distinct separation of PCa patients by AR-V7 status (positive or negative) was observed. Together, the presence and amount of AR-V7 in serum offer predictive and prognostic value to inform selection between two classes of systemic treatments (i.e., hormones or taxanes). Triaging patients that are AR-V7-positive to other systemic treatments (e.g., taxane-based chemotherapy) can improve progression-free survival and overall survival.
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Affiliation(s)
- Sunil Rajput
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Desmond Pink
- Department of Oncology, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Scott Findlay
- Department of Oncology, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Emma Woolner
- Department of Oncology, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - John D. Lewis
- Department of Oncology, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Mark T. McDermott
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
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6
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Vázquez-Lozano JE, Baumberg JJ, Martínez A. Enhanced excitation and readout of plasmonic cavity modes in NPoM via SiN waveguides for on-chip SERS. OPTICS EXPRESS 2022; 30:4553-4563. [PMID: 35209689 DOI: 10.1364/oe.446895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
Metallic nanoparticle-on-a-mirror (NPoM) cavities enable extreme field confinement in sub-nm gaps, leading to unrivaled performance for nonlinear processes such as surface-enhanced Raman scattering (SERS). So far, prevailing experimental approaches based on NPoMs have been performed by means of free-space light excitation and collection under oblique incidence, since the fundamental radiatively-coupled NPoM mode does not scatter in the normal direction. Retaining this working principle, here we numerically show that plasmonic cavity modes in NPoM configurations can be efficiently excited in an integrated SERS approach through TM guided modes of silicon nitride (SiN) waveguides. Intensity enhancements beyond 105 can be achieved for gap spacings around 1 nm. So as to reduce unwanted SiN Raman background, the output Stokes signals are transferred to transversely placed waveguides, reaching coupling efficiencies of up to 10%. Geometrical parameters such as the gap thickness as well as the radius and position of the nanoparticle provide full control over the main spectral features, thereby enabling us to engineer and drive the optical response of NPoMs for high-performance SERS in Si-based photonic integrated platforms.
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7
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Armstrong RE, Horáček M, Zijlstra P. Plasmonic Assemblies for Real-Time Single-Molecule Biosensing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2003934. [PMID: 33258287 DOI: 10.1002/smll.202003934] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 10/09/2020] [Indexed: 05/11/2023]
Abstract
Their tunable optical properties and versatile surface functionalization have sparked applications of plasmonic assemblies in the fields of biosensing, nonlinear optics, and photonics. Particularly, in the field of biosensing, rapid advances have occurred in the use of plasmonic assemblies for real-time single-molecule sensing. Compared to individual particles, the use of assemblies as sensors provides stronger signals, more control over the optical properties, and access to a broader range of timescales. In the past years, they have been used to directly reveal single-molecule interactions, mechanical properties, and conformational dynamics. This review summarizes the development of real-time single-molecule sensors built around plasmonic assemblies. First, a brief overview of their optical properties is given, and then recent applications are described. The current challenges in the field and suggestions to overcome those challenges are discussed in detail. Their stability, specificity, and sensitivity as sensors provide a complementary approach to other single-molecule techniques like force spectroscopy and single-molecule fluorescence. In future applications, the impact in real-time sensing on ultralong timescales (hours) and ultrashort timescales (sub-millisecond), time windows that are difficult to access using other techniques, is particularly foreseen.
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Affiliation(s)
- Rachel E Armstrong
- Department of Applied Physics & Institute for Complex Molecular Systems, Eindhoven University of Technology, Postbus 513, Eindhoven, MB, 5600, the Netherlands
| | - Matěj Horáček
- Department of Applied Physics & Institute for Complex Molecular Systems, Eindhoven University of Technology, Postbus 513, Eindhoven, MB, 5600, the Netherlands
| | - Peter Zijlstra
- Department of Applied Physics & Institute for Complex Molecular Systems, Eindhoven University of Technology, Postbus 513, Eindhoven, MB, 5600, the Netherlands
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8
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Ma Y, Sikdar D, Fedosyuk A, Velleman L, Klemme DJ, Oh SH, Kucernak ARJ, Kornyshev AA, Edel JB. Electrotunable Nanoplasmonics for Amplified Surface Enhanced Raman Spectroscopy. ACS NANO 2020; 14:328-336. [PMID: 31808672 DOI: 10.1021/acsnano.9b05257] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Tuning the properties of optical metamaterials in real time is one of the grand challenges of photonics. Being able to do so will enable a class of adaptive photonic materials for use in applications such as surface enhanced Raman spectroscopy and reflectors/absorbers. One strategy to achieving this goal is based on the electrovariable self-assembly and disassembly of two-dimensional nanoparticle arrays at a metal | liquid interface. As expected, the structure results in plasmonic coupling between NPs in the array but perhaps as importantly between the array and the metal surface. In such a system, the density of the nanoparticle array can be reversibly controlled by the variation of electrode potential. Theory suggests that due to a collective plasmon-coupling effect less than 1 V variation of electrode potential can give rise to a dramatic simultaneous change in optical reflectivity from ∼93% to ∼1% and the amplification of the SERS signal by up to 5 orders of magnitude. This is experimentally demonstrated using a platform based on the voltage-controlled assembly of 40 nm Au-nanoparticle arrays at a TiN/Ag electrode in contact with an aqueous electrolyte. We show that all the physics underpinning the behavior of this platform works precisely as suggested by the proposed theory, setting the electrochemical nanoplasmonics as a promising direction in photonics research.
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Affiliation(s)
- Ye Ma
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
- School of Materials Science and Engineering , Ocean University of China , Qingdao , 266100 , China
| | - Debabrata Sikdar
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
- Department of Electronics and Electrical Engineering , Indian Institute of Technology Guwahati , Guwahati 781039 , India
| | - Aleksandra Fedosyuk
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
| | - Leonora Velleman
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
| | - Daniel J Klemme
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Sang-Hyun Oh
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Anthony R J Kucernak
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
| | - Alexei A Kornyshev
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
- Thomas Young Centre for Theory and Simulation of Materials , Imperial College London , South Kensington Campus , London SW7 2AZ , U.K
| | - Joshua B Edel
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K
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9
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Kim S, Jung HS, Kim DH, Kim SH, Park SG. 3D nanoporous plasmonic chips for extremely sensitive NO 2 detection. Analyst 2019; 144:7162-7167. [PMID: 31710050 DOI: 10.1039/c9an01697j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The detection of toxic gas molecules using the surface-enhanced Raman spectroscopy (SERS) technique is very challenging due to the low affinity of gas molecules. Here, we report extremely sensitive SERS-based NO2 gas sensors based on 3D nanoporous Au nanostructures with a high affinity for NO2 gas molecules and high density of hotspots.
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Affiliation(s)
- Sunho Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea.
| | - Ho Sang Jung
- Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 51508, Korea.
| | - Dong-Ho Kim
- Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 51508, Korea.
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea.
| | - Sung-Gyu Park
- Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 51508, Korea.
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10
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Localized surface curvature artifacts in tip-enhanced nanospectroscopy imaging. Ultramicroscopy 2019; 206:112811. [PMID: 31310887 DOI: 10.1016/j.ultramic.2019.112811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 06/26/2019] [Accepted: 07/04/2019] [Indexed: 01/27/2023]
Abstract
Tip-enhanced Raman spectroscopy (TERS) allows the chemical analysis with a spatial resolution at the nanoscale, well beyond what the diffraction limit of light makes possible. We can further boost the TERS sensitivity by using a metallic substrate in the so-called gap-mode TERS. In this context, the goal of this work is to provide a generalized view of imaging artifacts in TERS and near-field imaging that occur due to tip-sample coupling. Contrary to the case of gap-mode with a flat substrate where the size of the enhanced region is smaller than the tip size when visualizing 3D nanostructures the tip convolution effect may broaden the observed dimensions due to the local curvature of the sample. This effect is particularly critical considering that most works on gap-mode TERS consider a perfectly flat substrate which is rarely the case in actual experiments. We investigate a range of substrates to evidence these geometrical effects and to obtain an understanding of the nanoscale curvature role in TERS imaging. Our experimental results are complemented by numerical simulations and an analogy with atomic force microscopy artifacts is introduced. As a result, this work offers a useful analysis of gap-mode TERS imaging with tip- and substrate-related artifacts furthering our understanding and the reliability of near-field optical nanospectroscopy.
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11
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Lu W, Cui X, Chow TH, Shao L, Wang H, Chen H, Wang J. Switching plasmonic Fano resonance in gold nanosphere-nanoplate heterodimers. NANOSCALE 2019; 11:9641-9653. [PMID: 31065663 DOI: 10.1039/c9nr01653h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The interference between spectrally overlapping superradiant and subradiant plasmon resonances generates plasmonic Fano resonance, which allows for attractive applications such as electromagnetically induced transparency, light trapping, and refractometric sensing with high figures of merit. The active switching of plasmonic Fano resonance holds great promise in modulating optical signals, dynamically harvesting light energy, and constructing switchable plasmonic sensors. However, structures enabling the active control of plasmonic Fano resonance have rarely been achieved because of the fabrication complexity and cost. Herein we report on the realization of active plasmonic Fano resonance switching on Au nanosphere-nanoplate heterodimers. The active switching is enabled by varying the refractive index of a layer of polyaniline that fills in the gap between the Au nanosphere and the Au nanoplate. A reversible spectral shift of 20 nm is observed on the individual heterodimers during switching. The maximal spectral shift decreases as the interparticle gap distance is enlarged, showing a strong dependence of the spectral shift on the local electric field intensity enhancement in the gap region. This trend agrees with the predicted dependence of the refractive index sensitivity on the local field intensity enhancement. Our results provide insights into the development of plasmonic structures supporting actively switchable Fano resonances, which can lead to new technological applications, such as switchable cloaking and display, dynamic coding of optical signals, color sorting and filtering. The Au heterodimers with polyaniline in the gap can also be applied for the sensing of local environmental parameters such as pH values and heavy metal ions.
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Affiliation(s)
- Wenzheng Lu
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.
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12
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Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer. Sci Rep 2019; 9:1199. [PMID: 30718711 PMCID: PMC6362230 DOI: 10.1038/s41598-018-37882-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 12/14/2018] [Indexed: 11/18/2022] Open
Abstract
Plasmonic coupling provides a highly localized electromagnetic field in the gap of noble metals when illuminated by a light. The plasmonic field enhancement is generally known to be inversely proportional to the gap distance. Given such a relation, reducing the gap distance appears to be necessary to achieve the highest possible field enhancement. At the sub-nanometer scale, however, quantum mechanical effects have to be considered in relation to plasmonic coupling. Here, we use graphene as a spacer to observe plasmonic field enhancement in sub-nanometer gap. The gap distance is precisely controlled by the number of stacked graphene layers. We propose that the sudden drop of field enhancement for the single layer spacer is originated from the plasmon tunneling through the thin spacer. Numerical simulation which incorporates quantum tunneling is also performed to support the experimental results. From the fact that field enhancement with respect to the number of graphene layers exhibits different behavior in two wavelengths corresponding to on- and off-resonance conditions, tunneling phenomenon is thought to destroy the resonance conditions of plasmonic coupling.
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13
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Shin D. Heterogeneous gap-mode nanostructure for surface-enhanced Raman spectroscopic evaluation of charge transfer between noble metal nanoparticles and formaldehyde vapor. NANOSCALE 2018; 10:19478-19483. [PMID: 30318551 DOI: 10.1039/c8nr06532b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Gap-mode nanostructures offer a reliable, scalable and controllable Raman substrate with high signal enhancement, and they are widely used in surface-enhanced Raman spectroscopy. Heterogeneous gap-mode structures composed of different types of nanoparticles with the underlying substrate have been studied only in terms of understanding the electromagnetic field enhancement mechanism up to now, just by focusing on the role of hot spot as enhancing the Raman signal itself. In this study, gold and platinum nanoparticle-based heterogeneous gap-mode structures were fabricated on gold surface, and used to evaluate minute changes in the surface charged state (surface potential) of the nanoparticle interacting with different organic vapors. By monitoring the surface-enhanced Raman signal change of isonitrile probes in the hot spot, it was revealed that gold and platinum nanoparticles show opposite directions of charge transfer over the same formaldehyde treatment. This strategy offers a new way to evaluate the charge transfer phenomenon between organic vapor and nanoparticles, which is especially important in catalytic application, using conventional surface-enhanced Raman spectroscopy.
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Affiliation(s)
- Dongha Shin
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
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14
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Sharac N, Giles AJ, Perkins K, Tischler J, Bezares F, Prokes SM, Folland TG, Glembocki OJ, Caldwell JD. Implementation of plasmonic band structure to understand polariton hybridization within metamaterials. OPTICS EXPRESS 2018; 26:29363-29374. [PMID: 30470101 DOI: 10.1364/oe.26.029363] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 08/14/2018] [Indexed: 06/09/2023]
Abstract
Gap surface plasmons (GSPs) serve a diverse range of plasmonic applications, including energy harvesting, communications, molecular sensing, and optical detection. GSPs may be realized where tightly spaced plasmonic structures exhibit strong spatial overlap between the evanescent fields. We demonstrate that within similar, nested geometries that the near-fields of the GSPs within the individual nanostructures are hybridized. This creates two or more distinct resonances exhibiting near-field distributions extended over adjacent spatial regions. In contrast, dissimilar, nested structures exhibit two distinct resonances with nominally uncoupled near-fields, resulting in two or more individual antenna resonance modes. We deploy plasmonic band structure calculations to provide insight into the type and degree of hybridization within these systems, comparing the individual components. This understanding can be used in the optimized design of polaritonic metamaterial structures for desired applications.
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15
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Jia X, Bowen P, Huang Z, Liu X, Bingham C, Smith DR. Clarification of surface modes of a periodic nanopatch metasurface. OPTICS EXPRESS 2018; 26:3004-3012. [PMID: 29401833 DOI: 10.1364/oe.26.003004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 01/20/2018] [Indexed: 06/07/2023]
Abstract
We study the angle-dependent optical reflectance spectrum of a metasurface consisting of a periodic array of film-coupled plasmonic nanopatch particles. The nanopatch metasurface exhibits a strong, angle-independent absorption resonance at a wavelength defined by the nanopatch geometry and relative density. When the nanopatches are arranged in a regular lattice, a second, sharp absorption dip is present that varies strongly as a function of the incidence angle. This second resonance is a collective effect involving the excitation of surface plasmon modes and relates to a Wood's anomaly. Using an analytical model, we compute the surface modes of the structure and confirm details about the various mechanisms that contribute to the reflection spectra. The measured reflectance spectra are in excellent agreement with both analytical calculations and full-wave numerical simulations.
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16
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Yu B, Tracey JI, Cheng Z, Vacha M, O'Carroll DM. Plasmonic sphere-on-plane systems with semiconducting polymer spacer layers. Phys Chem Chem Phys 2018; 20:11749-11757. [DOI: 10.1039/c8cp01314d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Scattering color changes are investigated in plasmonic sphere-on-plane samples containing resonant and non-resonant conjugated polymer spacers.
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Affiliation(s)
- Binxing Yu
- Department of Chemistry & Chemical Biology
- Rutgers University
- Piscataway
- USA
| | - Jill I. Tracey
- Department of Chemistry & Chemical Biology
- Rutgers University
- Piscataway
- USA
| | - Zhongkai Cheng
- Department of Chemistry & Chemical Biology
- Rutgers University
- Piscataway
- USA
| | - Martin Vacha
- Department of Materials Science & Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Deirdre M. O'Carroll
- Department of Chemistry & Chemical Biology
- Rutgers University
- Piscataway
- USA
- Department of Materials Science and Engineering
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17
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Pilo-Pais M, Acuna GP, Tinnefeld P, Liedl T. Sculpting Light by Arranging Optical Components with DNA Nanostructures. MRS BULLETIN 2017; 42:936-942. [PMID: 31168224 PMCID: PMC6546597 DOI: 10.1557/mrs.2017.278] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
DNA nanotechnology has developed into a state where the design and assembly of complex nanoscale structures has become fast, reliable, cost-effective, and accessible to non-experts. Nanometer-precise positioning of organic (dyes, biomolecules, etc.) and inorganic (metal nanoparticles, colloidal quantum dots, etc.) components on DNA nanostructures is straightforward and modular. In this perspective article, we identify the opportunities and challenges that DNA-assembled devices and materials are facing for optical antennas, metamaterials, and sensing applications. With the abilities of arranging hybrid materials in defined geometries, plasmonic effects will, for example, amplify molecular recognition transduction so that single-molecule events will be measureable with simple devices. On the larger scale, DNA nanotechnology has the potential of breaking the symmetry of common self-assembled functional materials creating pre-defined optical properties such as refractive index tuning, Bragg reflection and topological insulation.
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Affiliation(s)
- Mauricio Pilo-Pais
- Faculty of Physics and Center for Nanoscience, Ludwig-Maximilians-Universität München, 80539, München, Germany
| | - Guillermo P Acuna
- Institute for Physical and Theoretical Chemistry, TU Braunschweig, Braunschweig University of Technology, 38106 Braunschweig, Germany
| | - Philip Tinnefeld
- Department for Chemistry and Center for Nanoscience, Ludwig-Maximilians-Universität München, 81377 München, Germany
| | - Tim Liedl
- Faculty of Physics and Center for Nanoscience, Ludwig-Maximilians-Universität München, 80539, München, Germany
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18
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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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19
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Inagaki M, Motobayashi K, Ikeda K. Electrochemical THz-SERS Observation of Thiol Monolayers on Au(111) and (100) Using Nanoparticle-assisted Gap-Mode Plasmon Excitation. J Phys Chem Lett 2017; 8:4236-4240. [PMID: 28830138 DOI: 10.1021/acs.jpclett.7b01901] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Surface-enhanced Raman scattering (SERS) microscopy using nanoparticle-assisted gap-mode plasmon excitation, which enables us to observe an atomically defined planar metal surface, was combined with THz-Raman spectroscopy to observe ultra-low-frequency vibration modes under electrochemical conditions. This combination helps us to gain deeper insights into electrode/electrolyte interfaces via direct observation of extramolecular vibrations including information on intermolecular and substrate/molecule interactions. Electrochemical reductive desorption of benzenethiol derivatives from Au(111) and (100) was monitored to demonstrate the power of this spectroscopy. Structural differences of the monolayers between these surfaces were seen only in the extramolecular vibration modes such as a large-amplitude hinge-bending motion of the phenyl ring. On the Au(111), where hollow-site and bridge-site adsorption coexisted, the electrochemical reductive desorption was preferentially induced at the hollow sites.
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Affiliation(s)
- Motoharu Inagaki
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
| | - Kenta Motobayashi
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
| | - Katsuyoshi Ikeda
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
- Frontier Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology , Nagoya 466-8555, Japan
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
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20
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Electrochemical SERS observation of molecular adsorbates on Ru/Pt-modified Au(111) surfaces using sphere-plane type gap-mode plasmon excitation. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.11.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Zuo Z, Wen Y, Zhang S, Qu J, Cui G, Shi Y. Enhanced plasmon coupling of partly embedded gold nanospheres with surrounding silicon. NANOTECHNOLOGY 2017; 28:285201. [PMID: 28562370 DOI: 10.1088/1361-6528/aa7621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Gold nanospheres (AuNSs) were partly embedded into silicon through metal-assisted chemical etching, producing multiple-dimensional coupling of the plasmon resonances with the induced image charges in the surrounding medium. Rich plasmonic features of such coupling system were revealed by single particle dark-field scattering spectra, characterizing by two splitted multipolar resonances at short wavelength region and a mixed dipolar resonance extending to infrared region. Numerical electrodynamic calculations indicated that the multipolar modes arise from the in-plane and out-of-plane quadrupolar resonances, which are excited by the horizontal and verticle electric field components, respectively, of the incident light owing to the enhanced coupling interaction. As the embedding depth increases, the degree of symmetry breaking in such nanoparticles/substrate system changes, resulting in significantly modified optical response, which supplies a new way to modulate the optical properties of plasmonic nanoparticles.
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Affiliation(s)
- Zewen Zuo
- Anhui Province Key Laboratory of Optoelectric Materials Science and Technology (OEMST), College of Physics and Electronics Information, Anhui Normal University, Wuhu, 241000, People's Republic of China. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
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22
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Lum W, Bruzas I, Gorunmez Z, Unser S, Beck T, Sagle L. Novel Liposome-Based Surface-Enhanced Raman Spectroscopy (SERS) Substrate. J Phys Chem Lett 2017; 8:2639-2646. [PMID: 28535675 DOI: 10.1021/acs.jpclett.7b00694] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Although great strides have been made in recent years toward making highly enhancing surface-enhanced Raman spectroscopy (SERS) substrates, the biological compatibility of such substrates remains a crucial problem. To address this issue, liposome-based SERS substrates have been constructed in which the biological probe molecule is encapsulated inside the aqueous liposome compartment, and metallic elements are assembled using the liposome as a scaffold. Therefore, the probe molecule is not in contact with the metallic surfaces. Herein we report our initial characterization of these novel nanoparticle-on-mirror substrates, both experimentally and theoretically, using finite-difference time-domain calculations. The substrates are shown to be structurally stable to laser irradiation, the liposome compartment does not rise above 45 °C, and they exhibit an analytical enhancement factor of 8 × 106 for crystal violet encapsulated in 38 liposomes sandwiched between a 40 nm planar gold mirror and 80 nm gold colloid.
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Affiliation(s)
- William Lum
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
| | - Ian Bruzas
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
| | - Zohre Gorunmez
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
| | - Sarah Unser
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
| | - Thomas Beck
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
| | - Laura Sagle
- Department of Chemistry, College of Arts and Sciences, University of Cincinnati , 301 West Clifton Court, Cincinnati, Ohio 45221-0172, United States
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23
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Wang H, Yao K, Parkhill JA, Schultz ZD. Detection of electron tunneling across plasmonic nanoparticle-film junctions using nitrile vibrations. Phys Chem Chem Phys 2017; 19:5786-5796. [PMID: 28180214 PMCID: PMC5325176 DOI: 10.1039/c6cp08168a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The significant electric field enhancements that occur in plasmonic nanogap junctions are instrumental in boosting the performance of spectroscopy, optoelectronics and catalysis. Electron tunneling, associated with quantum effects in small junctions, is reported to limit the electric field enhancement. However, observing and quantitatively determining how tunneling alters the electric fields within small gaps is challenging due to the nanoscale dimensions and heterogeneity present experimentally. Here, we report the use of a nitrile probe placed in the nanoparticle-film gap junctions to demonstrate that the change in the nitrile stretching band associated with the vibrational Stark effect can be directly correlated with the local electric field environment modulated by gap size variations. The emergence of Stark shifts correlates with plasmon resonance shifts associated with electron tunneling across the gap junction. Time dependent changes in the nitrile band with extended illumination further support a build up of charge associated with optical rectification in the coupled plasmon system. Computational models agree with our experimental observations that the frequency shifts arise from a vibrational Stark effect. Large local electric fields associated with the smallest gap junctions give rise to significant Stark shifts. These results indicate that nitrile Stark probes can measure the local field strengths in plasmonic junctions and monitor the subtle changes in the local electric fields resulting from electron tunneling.
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Affiliation(s)
- Hao Wang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
| | - Kun Yao
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
| | - John A Parkhill
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
| | - Zachary D Schultz
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
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24
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Ding SY, You EM, Tian ZQ, Moskovits M. Electromagnetic theories of surface-enhanced Raman spectroscopy. Chem Soc Rev 2017; 46:4042-4076. [DOI: 10.1039/c7cs00238f] [Citation(s) in RCA: 734] [Impact Index Per Article: 104.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A fundamental theoretical understanding of SERS, and SERS hotspots, leads to new design principles for SERS substrates and new applications in nanomaterials and chemical analysis.
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Affiliation(s)
- Song-Yuan Ding
- State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS)
- Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), and Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - En-Ming You
- State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS)
- Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), and Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Zhong-Qun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS)
- Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), and Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Martin Moskovits
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- California
- USA
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25
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Joshi PB, Anthony TP, Wilson AJ, Willets KA. Imaging out-of-plane polarized emission patterns on gap mode SERS substrates: from high molecular coverage to the single molecule regime. Faraday Discuss 2017; 205:245-259. [DOI: 10.1039/c7fd00163k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Gap mode surface-enhanced Raman scattering (SERS) substrates are created when a single nanoparticle is deposited on a thin metal film, creating a region of significant electromagnetic field enhancement in the gap between the nanoparticle and the film due to excitation of a vertically-oriented, out-of-plane dipole plasmon mode, e.g. the gap plasmon. When molecules are located in the gap and couple to the gap plasmon mode, the resulting emission is polarized perpendicular to the thin film, generating SERS emission patterns that have a characteristic donut shape. We analyze these SERS emission patterns using a dipole emission model and extract out-of-plane and in-plane emission angles associated with the gap plasmon mode. Fluctuations in both of these angles reveal dynamic heterogeneity due to molecular motion within the hot spot that changes as a function of molecular coverage. We also reveal static heterogeneity associated with structural defects in the thin film component of the gap mode substrates, indicating that even nanometer-scale surface roughness can impact the quality of gap mode emission.
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Affiliation(s)
- P. B. Joshi
- Department of Chemistry
- Temple University
- Philadelphia
- USA
| | - T. P. Anthony
- Department of Chemistry
- Temple University
- Philadelphia
- USA
| | - A. J. Wilson
- Department of Chemistry
- Temple University
- Philadelphia
- USA
| | - K. A. Willets
- Department of Chemistry
- Temple University
- Philadelphia
- USA
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26
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Mertens J, Demetriadou A, Bowman RW, Benz F, Kleemann ME, Tserkezis C, Shi Y, Yang HY, Hess O, Aizpurua J, Baumberg JJ. Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities. NANO LETTERS 2016; 16:5605-11. [PMID: 27529641 DOI: 10.1021/acs.nanolett.6b02164] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report the light-induced formation of conductive links across nanometer-wide insulating gaps. These are realized by incorporating spacers of molecules or 2D monolayers inside a gold plasmonic nanoparticle-on-mirror (NPoM) geometry. Laser irradiation of individual NPoMs controllably reshapes and tunes the plasmonic system, in some cases forming conductive bridges between particle and substrate, which shorts the nanometer-wide plasmonic gaps geometrically and electronically. Dark-field spectroscopy monitors the bridge formation in situ, revealing strong plasmonic mode mixing dominated by clear anticrossings. Finite difference time domain simulations confirm this spectral evolution, which gives insights into the metal filament formation. A simple analytic cavity model describes the observed plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the NPoM. Our results show how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop technologies such as resistive memory devices (memristors).
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Affiliation(s)
- J Mertens
- NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom
| | - A Demetriadou
- Centro de Física de Materiales, Centro Mixto CSIC-UPV/EHU, and Donostia International Physics Center (DIPC), Paseo Manuel Lardizabal 4, 20018 Donostia-San Sebastian, Spain
- Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - R W Bowman
- NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom
| | - F Benz
- NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom
| | - M-E Kleemann
- NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom
| | - C Tserkezis
- Centro de Física de Materiales, Centro Mixto CSIC-UPV/EHU, and Donostia International Physics Center (DIPC), Paseo Manuel Lardizabal 4, 20018 Donostia-San Sebastian, Spain
| | - Y Shi
- Pillar of Engineering Product Development, Singapore University of Technology and Design , Singapore 138682, Singapore
| | - H Y Yang
- Pillar of Engineering Product Development, Singapore University of Technology and Design , Singapore 138682, Singapore
| | - O Hess
- Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - J Aizpurua
- Centro de Física de Materiales, Centro Mixto CSIC-UPV/EHU, and Donostia International Physics Center (DIPC), Paseo Manuel Lardizabal 4, 20018 Donostia-San Sebastian, Spain
| | - J J Baumberg
- NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom
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27
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Long J, Yi H, Li H, Lei Z, Yang T. Reproducible Ultrahigh SERS Enhancement in Single Deterministic Hotspots Using Nanosphere-Plane Antennas Under Radially Polarized Excitation. Sci Rep 2016; 6:33218. [PMID: 27621109 PMCID: PMC5020428 DOI: 10.1038/srep33218] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/23/2016] [Indexed: 11/26/2022] Open
Abstract
Surface enhanced Raman scattering (SERS) in a nanometer size hotspot has empowered the investigation of chemical structures and dynamic behaviors of one and a few molecules. However, further advancement is hindered by lack of large enough yet reproducible enhancement in single deterministic hotspots. To resolve this problem, here we introduce a nanosphere-plane antenna under radially polarized laser excitation experiment, which provides an electromagnetic enhancement of 109~10 at the gap of each individual nanosphere-plane antenna and a root-mean-square error down to 100.08 between them. The experiment also reveals a nonlinear SERS behavior with less than one plasmon, which is also observed within a single hotspot. The unprecedented simultaneous achievement of ultrahigh enhancement and reproducibility in deterministic individual hotspots is attributed to the combination of a well-controlled hotspot geometry, the efficient coupling between vertical antenna and laser which produces orders of magnitude higher enhancement than previous excitation methods, and low power operation which is critical for high reproducibility. Our method opens a path for systematic studies on single and few molecule SERS and their surface chemistry in an in-situ and well-controlled manner.
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Affiliation(s)
- Jing Long
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, UM - SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hui Yi
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, UM - SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hongquan Li
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, UM - SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zeyu Lei
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, UM - SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Tian Yang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, UM - SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
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28
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Li A, Srivastava SK, Abdulhalim I, Li S. Engineering the hot spots in squared arrays of gold nanoparticles on a silver film. NANOSCALE 2016; 8:15658-15664. [PMID: 27515538 DOI: 10.1039/c6nr03692a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Density of nanoparticle (NP) arrays affects the hot spots distribution and strength in NP-metal film (NP-MF) geometry. In-depth understanding of the variation of electromagnetic (EM) field enhancement with NPs density is essential for wide applications of the NP-MF geometry such as surface-enhanced spectroscopies and enhanced efficiency of optoelectronic devices. Here, we show that the field distribution in the NP array on the metal film is greatly enhanced and confined at the NP-NP junctions for very small horizontal gap (g) between neighboring NPs, whereas the fields at the NP-MF junction are extremely small. When gradually increasing g, the field enhancement at the NP-NP junction decreases, along with the gradually enhanced fields at the NP-MF junction. We show that there is an optimal value of horizontal gap (∼75 nm for 80 nm Au NP array on Ag film with 532 nm normal incidence), indicating that the average field enhancement in NP-MF geometry can be optimized by adjusting the horizontal gap. More importantly, it is found that the EM field enhancement is greatly decreased when g fulfills the requirement to couple the 532 nm incident light into SPPs, because of the interference between the LSPR and the SPPs, which leads to a Fano dip at the incident wavelength of 532 nm.
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Affiliation(s)
- Anran Li
- School of Materials Science and Engineering, NTU-HUJ-BGU NEW CREATE Programme, Nanyang Technological University, 639798, Singapore.
| | - Sachin K Srivastava
- School of Materials Science and Engineering, NTU-HUJ-BGU NEW CREATE Programme, Nanyang Technological University, 639798, Singapore.
| | - Ibrahim Abdulhalim
- School of Materials Science and Engineering, NTU-HUJ-BGU NEW CREATE Programme, Nanyang Technological University, 639798, Singapore. and Department of Electro-optic Engineering & Ilse Katz Institute for Nanoscale Sciences and Technology, Ben Gurion University of the Negev, Beer sheva-84105, Israel
| | - Shuzhou Li
- School of Materials Science and Engineering, NTU-HUJ-BGU NEW CREATE Programme, Nanyang Technological University, 639798, Singapore.
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29
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Lu H, Kang Z, Lei J, Ho HP. Tunable double resonance of silver nanodecahedron on the insulator/conductor film. OPTICS EXPRESS 2016; 24:10611-10619. [PMID: 27409883 DOI: 10.1364/oe.24.010611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The generation of double resonance in a nanostructure, thus permitting the modulation of optical field at two frequencies simultaneously, offers new application opportunities for surface enhanced Raman scattering (SERS) and surface enhanced fluorescence (SEF). Here, we present a simple composite nanostructure of silver nanodecahedron (Ag ND)/silica spacer/gold film/glass substrate for achieving double resonance under the normal incidence of polarized light. The optical responses of the composite structure have been theoretically studied by varying the thickness of silica spacer layer from 5 nm to 35 nm for mediating the interaction between Ag ND and gold film. Results indicate that the extinction spectrum of the composite system is strongly dependent on the separation between Ag ND and gold film. The electric field and charge distribution during resonance have been investigated in order to obtain a detailed understanding on the coupling between these two objects. More importantly, due to the anisotropic geometry of Ag ND, double resonance with two plasmonic modes (dipole and gap modes) whose responses can be adjusted through varying the size of Ag ND and mediating its coupling with the gold film respectively, has been achieved in the composite structure under the excitation with polarization parallel to the Ag ND edge adjacent to the spacer surface. The knowledge gained through this work will benefit the development of applications based on local field enhancement.
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30
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Lin Y, Zhang X, Fang X, Liang S. A cross-stacked plasmonic nanowire network for high-contrast femtosecond optical switching. NANOSCALE 2016; 8:1421-1429. [PMID: 26676311 DOI: 10.1039/c5nr06464c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report an ultrafast optical switching device constructed by stacking two layers of gold nanowires into a perpendicularly crossed network, which works at a speed faster than 280 fs with an on/off modulation depth of about 22.4%. The two stacks play different roles in enhancing consistently the optical switching performance due to their different dependence on the polarization of optical electric fields. The cross-plasmon resonance based on the interaction between the perpendicularly stacked gold nanowires and its Fano-coupling with Rayleigh anomaly is the dominant mechanism for such a high-contrast optical switching device.
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Affiliation(s)
- Yuanhai Lin
- Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
| | - Xinping Zhang
- Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
| | - Xiaohui Fang
- Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
| | - Shuyan Liang
- Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
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31
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Lee J, Zhang Q, Park S, Choe A, Fan Z, Ko H. Particle-Film Plasmons on Periodic Silver Film over Nanosphere (AgFON): A Hybrid Plasmonic Nanoarchitecture for Surface-Enhanced Raman Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2016; 8:634-642. [PMID: 26684078 DOI: 10.1021/acsami.5b09753] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Plasmonic systems based on particle-film plasmonic couplings have recently attracted great attention because of the significantly enhanced electric field at the particle-film gaps. Here, we introduce a hybrid plasmonic architecture utilizing combined plasmonic effects of particle-film gap plasmons and silver film over nanosphere (AgFON) substrates. When gold nanoparticles (AuNPs) are assembled on AgFON substrates with controllable particle-film gap distances, the AuNP-AgFON system supports multiple plasmonic couplings from interparticle, particle-film, and crevice gaps, resulting in a huge surface-enhanced Raman spectroscopy (SERS) effect. We show that the periodicity of AgFON substrates and the particle-film gaps greatly affects the surface plasmon resonances, and thus, the SERS effects due to the interplay between multiple plasmonic couplings. The optimally designed AuNP-AgFON substrate shows a SERS enhancement of 233 times compared to the bare AgFON substrate. The ultrasensitive SERS sensing capability is also demonstrated by detecting glutathione, a neurochemical molecule that is an important antioxidant, down to the 10 pM level.
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Affiliation(s)
- Jiwon Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Qianpeng Zhang
- Department of Electronic & Computer Engineering, Hong Kong University of Science & Technology (HKUST) , Hong Kong SAR, China
| | - Seungyoung Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Ayoung Choe
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Zhiyong Fan
- Department of Electronic & Computer Engineering, Hong Kong University of Science & Technology (HKUST) , Hong Kong SAR, China
| | - Hyunhyub Ko
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST) , Ulsan 44919, Republic of Korea
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32
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Hu J, Hoshi N, Uosaki K, Ikeda K. Vibrational Spectroscopic Observation of Atomic-Scale Local Surface Sites Using Site-Selective Signal Enhancement. NANO LETTERS 2015; 15:7982-7986. [PMID: 26551000 DOI: 10.1021/acs.nanolett.5b03093] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Molecule-substrate interactions are sensitively affected by atomic-scale surface structures. Unique activity in heterogeneous catalysts or electrocatalysts is often related with local surface sites with specific structures. We demonstrate that adsorption geometry of a model molecule with an isocyanide anchor is drastically varied among one-fold atop, two-fold bridge, and three-fold hollow configurations with increasing the size of atomic-scale local surface sites of Pd islands on an Au(111) model surface. The vibrational spectroscopic observation of such local information is realized by site-selective and self-assembled formation of hotspots, where Raman scattering intensity is significantly enhanced via excitation of localized surface plasmons.
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Affiliation(s)
- Jian Hu
- Division of Chemistry, Graduate School of Science, Hokkaido University , Sapporo 060-0810, Japan
- Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
| | - Nagahiro Hoshi
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University , Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
| | - Kohei Uosaki
- Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
| | - Katsuyoshi Ikeda
- Division of Chemistry, Graduate School of Science, Hokkaido University , Sapporo 060-0810, Japan
- Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
- Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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33
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An environmentally benign method for the biosynthesis of stable selenium nanoparticles. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-015-2272-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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34
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Zhou Q, Meng G, Zheng P, Cushing S, Wu N, Huang Q, Zhu C, Zhang Z, Wang Z. A Surface-Enhanced Raman Scattering Sensor Integrated with Battery-Controlled Fluidic Device for Capture and Detection of Trace Small Molecules. Sci Rep 2015; 5:12865. [PMID: 26238799 PMCID: PMC4523941 DOI: 10.1038/srep12865] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 07/10/2015] [Indexed: 01/29/2023] Open
Abstract
For surface-enhanced Raman scattering (SERS) sensors, one of the important issues is the development of substrates not only with high SERS-activity but also with strong ability to capture analytes. However, it is difficult to achieve the two goals simultaneously especially when detecting small molecules. Herein a compact battery-controlled nanostructure-assembled SERS system has been demonstrated for capture and detection of trace small molecule pollutants in water. In this SERS fluidic system, an electrical heating constantan wire covered with the vertically aligned ZnO nanotapers decorated with Ag-nanoparticles is inserted into a glass capillary. A mixture of thermo-responsive microgels, Au-nanorods colloids and analyte solution is then filled into the remnant space of the capillary. When the system is heated by switching on the battery, the thermo-responsive microgels shrink, which immobilizes the analyte and drives the Au-nanorod close to each other and close to the Ag-ZnO nanotapers. This process has also created high-density “hot spots” due to multi-type plasmonic couplings in three-dimensional space, amplifying the SERS signal. This integrated device has been successfully used to measure methyl parathion in lake water, showing a great potential in detection of aquatic pollutants.
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Affiliation(s)
- Qitao Zhou
- Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Guowen Meng
- 1] Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China [2] University of Science &Technology of China, Hefei 230026, P. R. China
| | - Peng Zheng
- Department of Mechanical &Aerospace Engineering, West Virginia University, P.O. Box 6106, Morgantown, WV 26506, USA
| | - Scott Cushing
- Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
| | - Nianqiang Wu
- Department of Mechanical &Aerospace Engineering, West Virginia University, P.O. Box 6106, Morgantown, WV 26506, USA
| | - Qing Huang
- Key Laboratory of Ion Beam Bioengineering, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Chuhong Zhu
- Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Zhuo Zhang
- Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Zhiwei Wang
- Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China
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Ding T, Sigle D, Zhang L, Mertens J, de Nijs B, Baumberg J. Controllable Tuning Plasmonic Coupling with Nanoscale Oxidation. ACS NANO 2015; 9:6110-8. [PMID: 25978297 PMCID: PMC4485956 DOI: 10.1021/acsnano.5b01283] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/15/2015] [Indexed: 05/22/2023]
Abstract
The nanoparticle on mirror (NPoM) construct is ideal for the strong coupling of localized plasmons because of its simple fabrication and the nanometer-scale gaps it offers. Both of these are much harder to control in nanoparticle dimers. Even so, realizing controllable gap sizes in a NPoM remains difficult and continuous tunability is limited. Here, we use reactive metals as the mirror so that the spacing layer of resulting metal oxide can be easily and controllably created with specific thicknesses resulting in continuous tuning of the plasmonic coupling. Using Al as a case study, we contrast different approaches for oxidation including electrochemical oxidation, thermal annealing, oxygen plasma treatments, and photo-oxidation by laser irradiation. The thickness of the oxidation layer is calibrated with depth-mode X-ray photoemission spectroscopy (XPS). These all consistently show that increasing the thickness of the oxidation layer blue-shifts the plasmonic resonance peak while the transverse mode remains constant, which is well matched by simulations. Our approach provides a facile and reproducible method for scalable, local and controllable fabrication of NPoMs with tailored plasmonic coupling, suited for many applications of sensing, photochemistry, photoemission, and photovoltaics.
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36
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Zengin A, Tamer U, Caykara T. A new plasmonic device made of gold nanoparticles and temperature responsive polymer brush on a silicon substrate. J Colloid Interface Sci 2015; 448:215-21. [DOI: 10.1016/j.jcis.2015.02.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 02/07/2015] [Accepted: 02/09/2015] [Indexed: 10/24/2022]
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Lee KT, Park JH, Kwon SJ, Kwon HK, Kyhm J, Kwak KW, Jang HS, Kim SY, Han JS, Lee SH, Shin DH, Ko H, Han IK, Ju BK, Kwon SH, Ko DH. Simultaneous enhancement of upconversion and downshifting luminescence via plasmonic structure. NANO LETTERS 2015; 15:2491-2497. [PMID: 25756859 DOI: 10.1021/nl5049803] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We describe a metal nanodisk-insulator-metal (MIM) structure that enhances lanthanide-based upconversion (UC) and downshifting (DS) simultaneously. The structure was fabricated using a nanotransfer printing method that facilitates large-area applications of nanostructures for optoelectronic devices. The proposed MIM structure is a promising way to harness the entire solar spectrum by converting both ultraviolet and near-infrared to visible light concurrently through resonant-mode excitation. The overall photoluminescence enhancements of the UC and DS were 174- and 29-fold, respectively.
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Affiliation(s)
- Kyu-Tae Lee
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
- §School of Electrical Engineering, Korea University, Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea
| | - Jong-Hyun Park
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
- ⊥Department of Chemistry, Korea University, Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - S Joon Kwon
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Hyun-Keun Kwon
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
- §School of Electrical Engineering, Korea University, Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea
| | - Jihoon Kyhm
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | | | - Ho Seong Jang
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Su Yeon Kim
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Joon Soo Han
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Sung-Hwan Lee
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Dong-Hun Shin
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Hyungduk Ko
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Il-Ki Han
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Byeong-Kwon Ju
- §School of Electrical Engineering, Korea University, Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea
| | | | - Doo-Hyun Ko
- †Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
- ‡Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi 130-701, Korea
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38
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Lumdee C, Yun B, Kik PG. Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances. NANOSCALE 2015; 7:4250-4255. [PMID: 25672261 DOI: 10.1039/c4nr05893c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effect of nanoscale surface roughness on the gap plasmon resonance of gold nanoparticles on thermally evaporated gold films is investigated experimentally and numerically. Single-particle scattering spectra obtained from 80 nm diameter gold particles on a gold film show significant particle-to-particle variation of the peak scattering wavelength of ±28 nm. The experimental results are compared with numerical simulations of gold nanoparticles positioned on representative rough gold surfaces, modeled based on atomic force microscopy measurements. The predicted spectral variation and average resonance wavelength show good agreement with the measured data. The study shows that nanometer scale surface roughness can significantly affect the performance of gap plasmon-based devices.
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Affiliation(s)
- Chatdanai Lumdee
- CREOL, The College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, USA
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39
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Zhang X, Zheng Y, Liu X, Lu W, Dai J, Lei DY, MacFarlane DR. Hierarchical porous plasmonic metamaterials for reproducible ultrasensitive surface-enhanced Raman spectroscopy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:1090-6. [PMID: 25534763 DOI: 10.1002/adma.201404107] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/16/2014] [Indexed: 05/21/2023]
Abstract
Hierarchical porous plasmonic metamaterials consisting of periodic nanoholes with tunable diameter and uniformly distributed mesopores over the bulk are developed as a new class of 3D surface-enhanced Raman spectroscopy (SERS) substrates. This multiscale architecture not only facilitates efficient cascaded electromagnetic enhancement but also provides an enormous number of Raman-active binding sites, exhibiting excellent reproducibility and ultrasensitive detection of aromatic molecules down to 10(-13) M.
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Affiliation(s)
- Xinyi Zhang
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
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40
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Ikeda K. ELECTROCHEMISTRY 2015; 83:112-115. [DOI: 10.5796/electrochemistry.83.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] Open
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41
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Hill RT. Plasmonic biosensors. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2014; 7:152-68. [PMID: 25377594 DOI: 10.1002/wnan.1314] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 09/19/2014] [Accepted: 09/29/2014] [Indexed: 11/11/2022]
Abstract
The unique optical properties of plasmon resonant nanostructures enable exploration of nanoscale environments using relatively simple optical characterization techniques. For this reason, the field of plasmonics continues to garner the attention of the biosensing community. Biosensors based on propagating surface plasmon resonances (SPRs) in films are the most well-recognized plasmonic biosensors, but there is great potential for the new, developing technologies to surpass the robustness and popularity of film-based SPR sensing. This review surveys the current plasmonic biosensor landscape with emphasis on the basic operating principles of each plasmonic sensing technique and the practical considerations when developing a sensing platform with the various techniques. The 'gold standard' film SPR technique is reviewed briefly, but special emphasis is devoted to the up-and-coming localized surface plasmon resonance and plasmonically coupled sensor technology.
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Affiliation(s)
- Ryan T Hill
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
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42
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Hill RT, Kozek KM, Hucknall A, Smith DR, Chilkoti A. Nanoparticle-Film Plasmon Ruler Interrogated with Transmission Visible Spectroscopy. ACS PHOTONICS 2014; 1:974-984. [PMID: 25541618 PMCID: PMC4270419 DOI: 10.1021/ph500190q] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Indexed: 05/25/2023]
Abstract
The widespread use of plasmonic nanorulers (PNRs) in sensing platforms has been plagued by technical challenges associated with the development of methods to fabricate precisely controlled nanostructures with high yield and characterize them with high throughput. We have previously shown that creating PNRs in a nanoparticle-film (NP-film) format enables the fabrication of an extremely large population of uniform PNRs with 100% yield using a self-assembly approach, which facilitates high-throughput PNR characterization using ensemble spectroscopic measurements and eliminates the need for expensive microscopy systems required by many other PNR platforms. We expand upon this prior work herein, showing that the NP-film PNR can be made compatible with aqueous sensing studies by adapting it for use in a transmission localized surface plasmon resonance spectroscopy format, where the coupled NP-film resonance responsible for the PNR signal is directly probed using an extinction measurement from a standard spectrophotometer. We designed slide holders that fit inside standard spectrophotometer cuvettes and position NP-film samples so that the coupled NP-film resonance can be detected in a collinear optical configuration. Once the NP-film PNR samples are cuvette-compatible, it is straightforward to calibrate the PNR in aqueous solution and use it to characterize dynamic, angstrom-scale distance changes resulting from pH-induced swelling of polyelectrolyte (PE) spacer layers as thin as 1 PE layer and also of a self-assembled monolayer of an amine-terminated alkanethiol. This development is an important step toward making PNR sensors more user-friendly and encouraging their widespread use in various sensing schemes.
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Affiliation(s)
- Ryan T. Hill
- Department of Biomedical Engineering, Department of Electrical
and Computer
Engineering, Center for Metamaterials and Integrated Plasmonics,
and Center for Biologically
Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708, United States
| | - Klaudia M. Kozek
- Department of Biomedical Engineering, Department of Electrical
and Computer
Engineering, Center for Metamaterials and Integrated Plasmonics,
and Center for Biologically
Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708, United States
| | - Angus Hucknall
- Department of Biomedical Engineering, Department of Electrical
and Computer
Engineering, Center for Metamaterials and Integrated Plasmonics,
and Center for Biologically
Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708, United States
| | - David R. Smith
- Department of Biomedical Engineering, Department of Electrical
and Computer
Engineering, Center for Metamaterials and Integrated Plasmonics,
and Center for Biologically
Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708, United States
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Department of Electrical
and Computer
Engineering, Center for Metamaterials and Integrated Plasmonics,
and Center for Biologically
Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708, United States
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Driskell JD, Larrick CG, Trunell C. Effect of hydration on plasmonic coupling of bioconjugated gold nanoparticles immobilized on a gold film probed by surface-enhanced Raman spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6309-6313. [PMID: 24854627 DOI: 10.1021/la500640q] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Gold nanoparticle (AuNP)-Au film constructs were prepared using antibody-antigen interactions or a small organic cross-linker to systematically control the gap between the AuNP and Au film. Surface-enhanced Raman spectroscopy (SERS), scanning electron micrsocopy (SEM), and atomic force microscopy (AFM) were used to characterize each construct and elucidate structure-activity relationships. Interestingly, plasmonic coupling and SERS intensity were reversibly modulated with wetting/drying cycles for the protein immobilized AuNP, and this effect was attributed to changes in protein size with hydration state. This work provides insight into fundamental limitations of AuNP-enabled SERS bioassays and will facilitate rational design of novel biospecific ligands that maximize SERS sensitivity.
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Affiliation(s)
- Jeremy D Driskell
- Department of Chemistry, Illinois State University , Normal, Illinois 61790, United States
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44
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Cao SH, Cai WP, Liu Q, Xie KX, Weng YH, Huo SX, Tian ZQ, Li YQ. Label-free aptasensor based on ultrathin-linker-mediated hot-spot assembly to induce strong directional fluorescence. J Am Chem Soc 2014; 136:6802-5. [PMID: 24785106 DOI: 10.1021/ja500976a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We have demonstrated the proof-of-concept of a label-free biosensor based on emission induced by an extreme hot-spot plasmonic assembly. In this work, an ultrathin linking layer composed of cationic polymers and aptamers was fabricated to mediate the assembly of a silver nanoparticles (AgNPs)-dyes-gold film with a strongly coupled architecture through sensing a target protein. Generation of directional surface plasmon coupled emission (SPCE) was thus stimulated as a means of reporting biorecognition. Both the biomolecules and the nanoparticles were totally free of labeling, thereby ensuring the activity of biomolecules and allowing the use of freshly prepared metallic nanoparticles with large dimensions. This sensor smartly prevents the plasmonic assembly in the absence of targets, thus maintaining no signal through quenching fluorophores loaded onto a gold film. In the presence of targets, the ultrathin layer is activated to link NPs-film junctions. The small gap of the junction (no greater than 2 nm) and the large diameter of the nanoparticles (~100 nm) ensure that ultrastrong coupling is achieved to generate intense SPCE. A >500-fold enhancement of the signal was observed in the biosensing. This strategy provides a simple, reliable, and effective way to apply plasmonic nanostructures in the development of biosensing.
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Affiliation(s)
- Shuo-Hui Cao
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China
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Hajisalem G, Min Q, Gelfand R, Gordon R. Effect of surface roughness on self-assembled monolayer plasmonic ruler in nonlocal regime. OPTICS EXPRESS 2014; 22:9604-10. [PMID: 24787848 DOI: 10.1364/oe.22.009604] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Recently, self-assembled monolayers (SAMs) have been used for plasmonic rulers to measure the nonlocal influence on the Au nanoparticle - metal film resonance wavelength shift and probe the ultimate field enhancement. Here we examine the influence of surface roughness on this plasmonic ruler in the nonlocal regime by comparing plasmonic resonance shifts for as-deposited and for ultra-flat Au films. It is shown that the resonance shift is larger for ultra-flat films, suggesting that there is not the saturation from nonlocal effects previously reported for the spacer range from 0.7 nm to 1.6 nm. We attribute the previously reported saturation to the planarization of the as-deposited films by thinner SAMs, as measured here by atomic-force microscopy. This work is of interest both in probing the ultimate limits of plasmonic enhancement with SAMs for applications in Raman and nonlinear optics, but also in the study of SAMs planarization as a function surface roughness.
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46
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Lee J, Hua B, Park S, Ha M, Lee Y, Fan Z, Ko H. Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy. NANOSCALE 2014; 6:616-623. [PMID: 24247586 DOI: 10.1039/c3nr04752k] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Plasmonic systems based on metal nanoparticles on a metal film have generated great interest for surface-enhanced Raman spectroscopy (SERS) chemical sensors. In this study, we describe the fabrication of ultrasensitive SERS substrates based on high-density gold nanostar assemblies on silver films with tailored surface plasmons, where multiple field enhancements from particle-film and interparticle plasmon couplings and lightening rod effects of sharp tips of nanostars contribute to the enormous Raman enhancements. We show that the interplay between interparticle and particle-film plasmon couplings of high-density gold nanostars (GNSs) on metal and dielectric films as a function of interparticle separation can be tailored to provide maximum SERS effects. We observe that the SERS enhancement factor (EF) of GNSs on a metal film as a function of interparticle separation follows a broken power law function, where the EF increases with the interparticle separation for the strong interparticle coupling range below an interparticle separation of ~0.8 times the GNS size, but decreases for the weak interparticle coupling range (for an interparticle separation of >0.8 times the GNS size). Finally, we demonstrate the use of tailored plasmonic substrates as ultrasensitive SERS chemical sensors with an attomole level of detection capability of 2,4-dinitrotoluene, a model compound of nitroaromatic explosives.
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Affiliation(s)
- Jiwon Lee
- School of Energy and Chemical Engineering, Ulsan National Institute Science and Technology (UNIST), Ulsan, Republic of Korea.
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47
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Fong KE, Yung LYL. Localized surface plasmon resonance: a unique property of plasmonic nanoparticles for nucleic acid detection. NANOSCALE 2013; 5:12043-71. [PMID: 24166199 DOI: 10.1039/c3nr02257a] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Localized surface plasmon resonance (LSPR) of noble metal nanoparticles (a.k.a. plasmonic nanoparticles) opens up a new horizon for advanced biomolecule sensing. However, an effective and practical sensing system still requires meticulous design to achieve good sensitivity and distinctive selectivity for routine use and high-throughput detection. In particular, the detection of DNA and RNA is crucial in biomedical research and clinical diagnostics. This review describes the fundamental aspects of LSPR and provides an overall account of how it is exploited to assist in nucleic acid sensing. The detection efficiency of each LSPR-based approach is assessed with respect to the assay design, the selection of plasmonic nanoparticles, and the choice of nucleic acid probes which influence the duplex hybridization. Judicious comparison is made among various LSPR-based approaches in terms of the assaying time, the sensitivity or lowest sensing concentration (i.e. limit of detection or LOD), and the single-base mismatch (SBM) selectivity.
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Affiliation(s)
- Kah Ee Fong
- Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Singapore 119260.
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Yoon JH, Yoon S. Probing interfacial interactions using core-satellite plasmon rulers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14772-14778. [PMID: 24236506 DOI: 10.1021/la403599p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Understanding molecular interactions at the interfaces of nanoparticles is fundamentally important because they determine the stability, affinity, functionality, and assembly of nanoparticles. However, probing the governing intermolecular forces at the interfaces, particularly for the nanoparticles dispersed in solution, remains challenging. Here, we demonstrate that the interfacial interactions between citrate-capped gold nanoparticles and various molecular functional groups can be probed using a plasmon ruler, based on a well-defined core-satellite nanoassembly structure. Different nature of the interactions causes a subtle change in the interparticle distance, and the change is sensitively measured as a shift in the plasmon coupling band of the core-satellite nanoassemblies. Molecular interactions including covalent bonding, hydrogen bonding, electrostatic interactions, and van der Waals interactions are explored.
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Affiliation(s)
- Jun Hee Yoon
- Department of Chemistry, Dankook University , 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi 448-701, Korea
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Ikeda K, Sato S, Takahashi K, Masuda T, Murakoshi K, Uosaki K. Surface optimization of optical antennas for plasmonic enhancement of photoelectrochemical reactions. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ikeda K, Suzuki S, Uosaki K. Enhancement of SERS background through charge transfer resonances on single crystal gold surfaces of various orientations. J Am Chem Soc 2013; 135:17387-92. [PMID: 24160263 DOI: 10.1021/ja407459t] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Surface-enhanced Raman scattering (SERS) spectra are accompanied by broad background emission, which limits improvements in the signal-to-noise ratio. Despite the close correlation between the background generation and the SERS enhancement, the chemical origin of the background emission has remained somewhat mysterious. In this work, SERS spectra of organic monolayers are systematically measured on an atomically defined single crystalline gold surface of various orientations, which specifically define metal-molecule chemical interactions. The use of sphere-plane type plasmonic nanogap structures on a well-defined surface enables us to evaluate the contribution of charge transfer resonances to SERS enhancement. The present results not only reveal that charge transfer resonance at metal-molecule interfaces increases the intensity of plasmon-mediated broadband emission but also provide us a consistent view about electronic structures of metal-molecule interfaces.
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Affiliation(s)
- Katsuyoshi Ikeda
- Division of Chemistry, Graduate School of Science, Hokkaido University , Sapporo 060-0810, Japan
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