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Côté MP, Boukouvala C, Richard-Daniel J, Ringe E, Boudreau D, Ritcey AM. Plasmonic Properties of Self-Assembled Gold Nanocrescents: Implications for Chemical Sensing. ACS APPLIED NANO MATERIALS 2024; 7:8783-8791. [PMID: 38694723 PMCID: PMC11059077 DOI: 10.1021/acsanm.4c00258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 03/13/2024] [Accepted: 03/19/2024] [Indexed: 05/04/2024]
Abstract
A bottom-up approach, the Langmuir-Blodgett technique, is used for the preparation of composite thin films of gold nanoparticles and polymers: poly(styrene-b-2-vinylpyridine), poly-2-vinylpyridine, and polystyrene. The self-assembly of poly(styrene-b-2-vinylpyridine) at the air-water interface leads to the formation of surface micelles, which serve as a template for the organization of gold nanoparticles into ring assemblies. By using poly-2-vinylpyridine in conjunction with low surface pressure, the distance between nanostructures can be increased, allowing for optical characterization of single nanostructures. Once deposited on a solid substrate, the preorganized gold nanoparticles are subjected to further growth by the reduction of additional gold, leading to a variety of nanostructures which can be divided into two categories: nanocrescents and circular arrays of nanoparticles. The optical properties of individual structures are investigated by optical dark-field spectroscopy and numerical calculations. The plasmonic behavior of the nanostructures is elucidated through the correlation of optical properties with structural features and the identification of dominant plasmon modes. Being based on a self-assembly approach, the reported method allows for the formation of interesting plasmonic materials under ambient conditions, at a relatively large scale, and at low cost. These attributes, in addition to the resonances located in the near-infrared region of the spectrum, make nanocrescents candidates for biological and chemical sensing.
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Affiliation(s)
- Marie-Pier Côté
- Department
of Chemistry, Center for Optics, Photonics and Lasers, and Center
for Research on Advanced Materials, Laval
University, Quebec
City G1 V 0A6, Canada
| | - Christina Boukouvala
- Department
of Materials Science and Metallurgy and Department of Earth Sciences, University of Cambridge, Cambridge CB3 0FS, United Kingdom
| | - Josée Richard-Daniel
- Department
of Chemistry, Center for Optics, Photonics and Lasers, and Center
for Research on Advanced Materials, Laval
University, Quebec
City G1 V 0A6, Canada
| | - Emilie Ringe
- Department
of Materials Science and Metallurgy and Department of Earth Sciences, University of Cambridge, Cambridge CB3 0FS, United Kingdom
| | - Denis Boudreau
- Department
of Chemistry, Center for Optics, Photonics and Lasers, and Center
for Research on Advanced Materials, Laval
University, Quebec
City G1 V 0A6, Canada
| | - Anna M. Ritcey
- Department
of Chemistry, Center for Optics, Photonics and Lasers, and Center
for Research on Advanced Materials, Laval
University, Quebec
City G1 V 0A6, Canada
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Chung T, Wang H, Cai H. Dielectric metasurfaces for next-generation optical biosensing: a comparison with plasmonic sensing. NANOTECHNOLOGY 2023; 34:10.1088/1361-6528/ace117. [PMID: 37352839 PMCID: PMC10416613 DOI: 10.1088/1361-6528/ace117] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 06/22/2023] [Indexed: 06/25/2023]
Abstract
In the past decades, nanophotonic biosensors have been extended from the extensively studied plasmonic platforms to dielectric metasurfaces. Instead of plasmonic resonance, dielectric metasurfaces are based on Mie resonance, and provide comparable sensitivity with superior resonance bandwidth, Q factor, and figure-of-merit. Although the plasmonic photothermal effect is beneficial in many biomedical applications, it is a fundamental limitation for biosensing. Dielectric metasurfaces solve the ohmic loss and heating problems, providing better repeatability, stability, and biocompatibility. We review the high-Q resonances based on various physical phenomena tailored by meta-atom geometric designs, and compare dielectric and plasmonic metasurfaces in refractometric, surface-enhanced, and chiral sensing for various biomedical and diagnostic applications. Departing from conventional spectral shift measurement using spectrometers, imaging-based and spectrometer-less biosensing are highlighted, including single-wavelength refractometric barcoding, surface-enhanced molecular fingerprinting, and integrated visual reporting. These unique modalities enabled by dielectric metasurfaces point to two important research directions. On the one hand, hyperspectral imaging provides massive information for smart data processing, which not only achieve better biomolecular sensing performance than conventional ensemble averaging, but also enable real-time monitoring of cellular or microbial behaviour in physiological conditions. On the other hand, a single metasurface can integrate both functions of sensing and optical output engineering, using single-wavelength or broadband light sources, which provides simple, fast, compact, and cost-effective solutions. Finally, we provide perspectives in future development on metasurface nanofabrication, functionalization, material, configuration, and integration, towards next-generation optical biosensing for ultra-sensitive, portable/wearable, lab-on-a-chip, point-of-care, multiplexed, and scalable applications.
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Affiliation(s)
- Taerin Chung
- Tech4Health Institute, New York University Langone Health, New York, NY 10016, United States of America
- Department of Radiology, New York University Langone Health, New York, NY 10016, United States of America
| | - Hao Wang
- Tech4Health Institute, New York University Langone Health, New York, NY 10016, United States of America
- Department of Radiology, New York University Langone Health, New York, NY 10016, United States of America
| | - Haogang Cai
- Tech4Health Institute, New York University Langone Health, New York, NY 10016, United States of America
- Department of Radiology, New York University Langone Health, New York, NY 10016, United States of America
- Department of Biomedical Engineering, New York University, Brooklyn, NY 11201, United States of America
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Aluminum Foil vs. Gold Film: Cost-Effective Substrate in Sandwich SERS Immunoassays of Biomarkers Reveals Potential for Selectivity Improvement. Int J Mol Sci 2023; 24:ijms24065578. [PMID: 36982652 PMCID: PMC10051902 DOI: 10.3390/ijms24065578] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/09/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023] Open
Abstract
The first application of aluminum foil (Al F) as a low-cost/high-availability substrate for sandwich immunoassay using surface-enhanced Raman spectroscopy (SERS) is reported. Untreated and unmodified Al F and gold film are used as substrates for sandwich SERS immunoassay to detect tuberculosis biomarker MPT64 and human immunoglobulin (hIgG) in less than 24 h. The limits of detection (LODs) for tuberculosis (TB) biomarker MPT64 on Al foil, obtained with commercial antibodies, are about 1.8–1.9 ng/mL, which is comparable to the best LOD (2.1 ng/mL) reported in the literature for sandwich ELISA, made with fresh in-house antibodies. Not only is Al foil competitive with traditional SERS substrate gold for the sandwich SERS immunoassay in terms of LOD, which is in the range 18–30 pM or less than 1 pmol of human IgG, but it also has a large cost/availability advantage over gold film. Moreover, human IgG assays on Al foil and Si showed better selectivity (by about 30–70% on Al foil and at least eightfold on Si) and a nonspecific response to rat or rabbit IgG, in comparison to the selectivity in assays using gold film.
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Jung I, Kim J, Lee S, Park W, Park S. Multiple Stepwise Synthetic Pathways toward Complex Plasmonic 2D and 3D Nanoframes for Generation of Electromagnetic Hot Zones in a Single Entity. Acc Chem Res 2023; 56:270-283. [PMID: 36693060 DOI: 10.1021/acs.accounts.2c00670] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
ConspectusRational design of nanocrystals with high controllability via wet chemistry is of critical importance in all areas of nanoscience and nanotechnology research. Specifically, morphologically complex plasmonic nanoparticles have received considerable attention because light-matter interactions are strongly associated with the size and shape of nanoparticles. Among many types of nanostructures, plasmonic nanoframes (NFs) with controllable structural intricacy could be excellent candidates as strong light-entrappers with inner voids as well as high surface area, leading to highly effective interaction with light and analytes compared to their solid counterparts. However, so far studies on single-rim-based NFs have suffered from insufficient near-field focusing capability due to their structural simplicity (e.g., a single rim or NF molded from simple platonic solids), which necessitates a conceptually new NF architecture. If one considers a stereoscopic nanostructure with dual, triple, and multiple resonant intra-nanogaps on each crystallographic facet of nanocrystals, unprecedented physicochemical properties could be expected. Realizing such complex multiple NFs with intraparticle surface plasmon coupling via localized surface plasmon resonance is very challenging due to the lack of synthetic strategic principles with systematic structural control, all of which require a deep understanding of surface chemistry. Moreover, realizing those complex architectures with high homogeneity in size and shape via a bottom-up method where diverse particle interactions are involved is more challenging. Although there have been several reports on NFs used for catalysis, techniques for production of structurally complex NFs with high uniformity and an understanding of the correlation between such complexity in a single plasmonic entity and electromagnetic near-field focusing have remained highly elusive.In this Account, we will summarize and highlight the rational synthetic pathways for the design of complex two-dimensional (2D) and three-dimensional (3D) NFs with unique inner rim structures and characterize their optical properties. This systematic strategy is based on publications from our group during the last 10 years. First, we will introduce a chemical step of shape transformation of triangular Au nanoplates to circular and hexagonal plates, which are used as sacrificial layers for the formation of NFs. Then, we will describe the methods on how to synthesize monorim-based plasmonic NFs using Pt scaffolds with different shapes and correlate with their electromagnetic near-field. Then, we will describe a multiple stepwise synthetic method for the formation of 2D complex NFs wherein different starting Au nanocrystals evolved from systematic shape transformation are used to produce circular, triangular, hexagonal, crescent, and Y-shaped inner hot zones. Then, we will discuss how one can synthesize NFs with multiple rims wherein rims with different diameters are concentrically connected, by exploiting chemical toolkits such as eccentric and concentric growth of Au, borrowing the concept of total synthesis that is frequently adopted in organic chemistry. We then introduce dual-rim-faceted NFs and frame-in-frame 3D matryoshka NF geometries via well-faceted growth of Au with high control of intra-nanogaps. Finally, and importantly, we will provide examples of more advanced hierarchical NF architectures produced by controlling geometrical shapes of nanoparticles, number of rims, and different components, leading to the expansion of the NF library.
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Affiliation(s)
- Insub Jung
- Department of Chemistry, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea.,Institute of Basic Science, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Jeongwon Kim
- Department of Chemistry, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Sungwoo Lee
- Department of Chemistry, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea.,Institute of Basic Science, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Woocheol Park
- Department of Chemistry, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Sungho Park
- Department of Chemistry, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
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Xu W, Zhao X, Zhang F, Liu J, Zhang K, Guo X, Wen J, Zhang J, Liu X, Wang Y, Yang S, Zhang Y. Confined growth of Ag nanoflakes induced by LSPR-driven carrier transfer in periodic nanopatterned arrays. NANOSCALE 2022; 14:14750-14759. [PMID: 36173260 DOI: 10.1039/d2nr03385b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The growth of metal nanostructures induced by surface plasmons has attracted widespread attention and provides a wide range of applications in the development of plasmonic nanochemistry, biosensors, photoelectrochemical coupling reactions, etc. Herein, a simple method is reported for the fabrication of Ag nanoflakes induced by the surface plasma on two-dimensional periodic nanopatterned arrays with the aid of 4-MBA molecules. The light radiation, molecules, and environmental gases are selected to track the formation mechanism of Ag nanoflakes. The in situ Raman observations and theoretical analyses confirm that small aromatic molecules with carboxyl groups play important roles in Ag nanoflake formation derived by localized surface plasmon resonance (LSPR)-driven carriers, which provide profound insights into the study of LSPR-driven carriers, participating in chemical reactions and the reconstruction of dense hot spots in nanogaps.
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Affiliation(s)
- Wei Xu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaoyu Zhao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Fengyi Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Jia Liu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Kun Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaojie Guo
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Jiahong Wen
- The College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
- Zhejiang Laboratory, Hangzhou 311100, P. R. China
| | - Jian Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaolian Liu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Yaxin Wang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Shikuan Yang
- Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
| | - Yongjun Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
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6
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Kuthala N, Shanmugam M, Kong X, Chiang CS, Hwang KC. Salt-mediated, plasmonic field-field/field-lattice coupling-enhanced NIR-II photodynamic therapy using core-gap-shell gold nanopeanuts. NANOSCALE HORIZONS 2022; 7:589-606. [PMID: 35527504 DOI: 10.1039/d1nh00631b] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Plasmonic field-field coupling-induced enhancement of the optical properties of dye molecules in the nanogaps among metal nanoparticle clusters and thin films has attracted significant attention especially in disease-related theranostic applications. However, it is very challenging to synthesize plasmonic core-gap-shell nanostructures with a well-controlled nanogap, uniform shape, and distances to maximize the plasmonic field-field coupling between the core and the shell. Herein, we synthesized Au@gap@AuAg nanopeanut-shaped core-gap-shell nanostructures (Au NPN) and tuned their optical absorption from near-infrared region-I (NIR-I) to near-infrared region-II (NIR-II) by filling their nanogap with a high dielectric NaCl(aq) aqueous solution, which led to a dramatic redshift in the plasmonic absorption band by 320 nm from 660 to 980 nm and a 12.6-fold increase (at 1064 nm) in the extinction coefficient in the NIR region (1000-1300 nm). Upon filling the nanogap with NaCl(aq) aqueous solution, the Au NPN6.5(NaCl) (i.e., ∼6.5 nm nanogap)-mediated NIR-II photodynamic therapy effect was dramatically enhanced, resulting in a much longer average lifespan of >55 days for the mice bearing a murine colon tumor and treated with Au NPN6.5(NaCl) plus 1064 nm light irradiation compared to the mice treated with Au NPN6.5 + 1064 nm light irradiation (without nanogap filled with dielectric NaCl(aq), 40 d) and the doxorubicin-treated group (23 d). This study demonstrates a simple but effective method to tune and maximize the plasmonic field-field coupling between the metal shell and metal core of core-gap-shell nanostructures, the plasmonic field-lattice interactions, and biomedical applications for the treatment of tumors. Overall, our work presents a new way to enhance/maximize the plasmonic field-field and field-lattice coupling, and thus the performance/sensitivities in nanogap-based bioimaging, sensing, and theranostic nanomaterials and devices.
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Affiliation(s)
- Naresh Kuthala
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.
| | - Munusamy Shanmugam
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.
| | - Xiangyi Kong
- Department of Breast Surgical Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Chi-Shiun Chiang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Kuo Chu Hwang
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.
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7
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Ma C, Zhao F, Zhou F, Li M, Zheng Z, Yan J, Li J, Li X, Guan BO, Chen K. Etching-free high-throughput intersectional nanofabrication of diverse optical nanoantennas for nanoscale light manipulation. J Colloid Interface Sci 2022; 622:950-959. [PMID: 35561613 DOI: 10.1016/j.jcis.2022.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/29/2022] [Accepted: 05/01/2022] [Indexed: 01/26/2023]
Abstract
The capabilities to manipulate light-matter interaction at the nanoscale lie at the core of many promising photonic applications. Optical nanoantennas, made of metallic or dielectric materials, have seen a rapid development for their remarkable optical properties facilitating the coupling of electromagnetic waves with subwavelength entities. However, high-throughput and cost-effective fabrication of these nanoantennas is still a daunting challenge. In this work, we provide a versatile nanofabrication method capable of producing large scale optical nanoantennas with different shapes. It is developed from colloidal lithography with no dry etching required. Furthermore, both metallic and all-dielectric nanoantennas can be readily fabrication in a high-throughput fashion. Au and Si nanodisks were fabricated and employed to assemble heterostructures with monolayer tungsten disulfide. Strong coupling is observed in both systems between plasmon modes (Au nanodisks) or anapole modes (Si nanodisks) with excitons. We believe that this nanofabrication method could find a wide range of applications with the diverse optical nanoantennas it can engineer.
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Affiliation(s)
- Churong Ma
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Feng Zhao
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Fangrong Zhou
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Meng Li
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Zhaoqiang Zheng
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
| | - Jiahao Yan
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China
| | - Jie Li
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Xiangping Li
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Bai-Ou Guan
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Kai Chen
- Guangdong Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
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8
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Park Y, Yoon HJ, Lee SE, Lee LP. Multifunctional Cellular Targeting, Molecular Delivery, and Imaging by Integrated Mesoporous-Silica with Optical Nanocrescent Antenna: MONA. ACS NANO 2022; 16:2013-2023. [PMID: 35041396 DOI: 10.1021/acsnano.1c07015] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Multifunctional nanoprobes have attracted significant attention in a wide range of disciplines such as nanomedicine, precision medicine, and cancer diagnosis and treatment. However, integrating multifunctional ability in a nanoscale structure to precisely target, image, and deliver with cellular spatial/temporal resolution is still challenging in cellulo applications. This is because the development of such high-precision resolution needs to be carried out without labeling, photobleaching, and structurally segregating live cells. In this study, we present an integrated nanostructure of a mesoporous-silica nanosphere with an optical nanocrescent antenna (MONA) for multifunctional cellular targeting, drug delivery, and molecular imaging with spatiotemporal resolution. MONA comprises a systematically constructed Au nanocrescent (AuNC) antenna as a nanosensor and optical switch on a mesoporous-silica nanosphere as a cargo to molecular delivery. MONA made of antiepithelial cell adhesion molecules (anti-EpCAM)-conjugated AuNC facilitates the specific targeting of breast cancer cells, resulting in a highly focused photothermal gradient that functions as a molecular emitter. This light-driven molecular, doxorubicin (DOX) delivery function allows rapid apoptosis of breast cancer cells. Since MONA permits the tracking of quantum biological electron-transfer processes, in addition to its role as an on-demand optical switch, it enables the monitoring of the dynamic behavior of cellular cytochrome c pivoting cell apoptosis in response to the DOX delivery. Owing to the integrated functions of molecular actuation and direct sensing at the precisely targeted spot afforded by MONA, we anticipate that this multifunctional optical nanoantenna structure will have an impact in the fields of nanomedicine, cancer theranostics, and basic life sciences.
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Affiliation(s)
- Younggeun Park
- Department of Bioengineering and Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center and University of California, Berkeley, California 94720, United States
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Hyeun Joong Yoon
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Somin Eunice Lee
- Department of Electrical & Computer Engineering, Department of Biomedical Engineering, Applied Physics, Biointerfaces Institute, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Luke P Lee
- Department of Bioengineering and Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center and University of California, Berkeley, California 94720, United States
- Department of Electrical Engineering and Computer Science, University of California, Berkeley, California 94720, United States
- Harvard Institute of Medicine, Harvard Medical School, Department of Medicine, Brigham and Women's Hospital, Harvard University, Boston, Massachusetts 02115 United States
- Institute of Quantum Biophysics, Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea
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9
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Pratap D, Vikas, Gautam R, Shaw AK, Soni S. Photothermal properties of stable aggregates of gold nanorods. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Shape-Dependent Catalytic Activity of Gold and Bimetallic Nanoparticles in the Reduction of Methylene Blue by Sodium Borohydride. Catalysts 2021. [DOI: 10.3390/catal11121442] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this study the catalytic activity of different gold and bimetallic nanoparticle solutions towards the reduction of methylene blue by sodium borohydride as a model reaction is investigated. By utilizing differently shaped gold nanoparticles, i.e., spheres, cubes, prisms and rods as well as bimetallic gold–palladium and gold–platinum core-shell nanorods, we evaluate the effect of the catalyst surface area as available gold surface area, the shape of the nanoparticles and the impact of added secondary metals in case of bimetallic nanorods. We track the reaction by UV/Vis measurements in the range of 190–850 nm every 60 s. It is assumed that the gold nanoparticles do not only act as a unit transferring electrons from sodium borohydride towards methylene blue but can promote the electron transfer upon plasmonic excitation. By testing different particle shapes, we could indeed demonstrate an effect of the particle shape by excluding the impact of surface area and/or surface ligands. All nanoparticle solutions showed a higher methylene blue turnover than their reference, whereby gold nanoprisms exhibited 100% turnover as no further methylene blue absorption peak was detected. The reaction rate constant k was also determined and revealed overall quicker reactions when gold or bimetallic nanoparticles were added as a catalyst, and again these were highest for nanoprisms. Furthermore, when comparing gold and bimetallic nanorods, it could be shown that through the addition of the catalytically active second metal platinum or palladium, the dye turnover was accelerated and degradation rate constants were higher compared to those of pure gold nanorods. The results explore the catalytic activity of nanoparticles, and assist in exploring further catalytic applications.
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11
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Hassan AKSO, Etman AS, Soliman EA. Dual-polarized nanocrescent antenna designed using efficient optimization techniques. APPLIED OPTICS 2021; 60:753-762. [PMID: 33690450 DOI: 10.1364/ao.410638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
A novel nanocrescent antenna with polarization diversity is introduced. It is formed from a crescent-shaped patch fed with a coupled strip transmission line. The antenna is located on top of a SiO2 thin film with a shielding ground layer underneath. The structure is supported by an arbitrary substrate. Polarization of the radiated field can be adjusted to be along either one of the two orthogonal polarizations based on which one of the two crescent patch modes is going to be excited. The excitation of either one of these two modes of the patch is achieved by switching between the two propagating modes of the feeding coupled strip transmission line. Using a dual-polarized antenna allows doubling the optical communication system's capacity via frequency reuse. The new crescent antenna dimensions are optimized to satisfy several goals, such as minimizing the losses, the deviation of the main beam direction away from broadside, and maximizing the radiation efficiency and axial ratio. Through the optimization process, simple surrogate kriging models replace the detailed electromagnetic simulation. The optimal response is achieved by applying two different optimizers. The first optimizer employs the design-centering technique using normed distances. The multiobjective particle swarm with the preference ranking organization method for enrichment evaluations is used by the second optimizer. In order to identify the critical dimensions to which the nanoantenna is most sensitive, a sensitivity analysis is used. The optimized antenna is capable of switching its radiation between two orthogonal pure linear polarizations with maximum radiation along the broadside direction. The size of the proposed antenna is about 500nm×500nm. Its impedance-matching bandwidth is higher than 30 THz centered around 193 THz (1550 nm). Its gain and radiation efficiency are higher than 5.2 dBi and 85%, respectively, all over the working frequency band.
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12
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Yasun E, Gandhi S, Choudhury S, Mohammadinejad R, Benyettou F, Gozubenli N, Arami H. Hollow micro and nanostructures for therapeutic and imaging applications. J Drug Deliv Sci Technol 2020; 60:102094. [PMID: 34335877 PMCID: PMC8320649 DOI: 10.1016/j.jddst.2020.102094] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Hollow particles have been extensively used in bioanalytical and biomedical applications for almost two decades due to their unique and tunable optoelectronic properties as well as their significantly high loading capacities. These intrinsic properties led them to be used in various bioimaging applications as contrast agents, controlled delivery (i.e. drugs, nucleic acids and other biomolecules) platforms and photon-triggered therapies (e.g. photothermal and photodynamic therapies). Since recent studies showed that imaging-guided targeted therapeutics have higher success rates, multimodal theranostic platforms (combination of one or more therapy and diagnosis modality) have been employed more often and hollow particles (i.e. nanoshells) have been one of the most efficient candidates to be used in multiple-purpose platforms, owing to their intrinsic properties that enable synergistic multimodal performance. In this review, recent advances in the applications of such hollow particles fabricated with various routes (either inorganic or organic based) were summarized to delineate strategies for tuning their properties for more efficient biomedical performance by overcoming common biological barriers. This review will pave the ways for expedited progress in design of next generation of hollow particles for clinical applications.
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Affiliation(s)
- Emir Yasun
- University of California, Santa Barbara and California NanoSystems Institute (CNSI), Santa Barbara, CA, 93106, USA
| | - Sonu Gandhi
- DBT-National Institute of Animal Biotechnology, Hyderabad, 500032, Telangana, India
| | - Samraggi Choudhury
- DBT-National Institute of Animal Biotechnology, Hyderabad, 500032, Telangana, India
| | - Reza Mohammadinejad
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Farah Benyettou
- New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Numan Gozubenli
- Molecular Biology and Genetics Department, Harran University, Sanliurfa, Turkey
| | - Hamed Arami
- Department of Radiology, Stanford School of Medicine, Stanford, CA, USA
- Molecular Imaging Program at Stanford (MIPS), The James H Clark Center, Stanford University, Stanford, CA, USA
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13
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Haddadnezhad M, Yoo S, Kim J, Kim JM, Son J, Jeong HS, Park D, Nam JM, Park S. Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings. NANO LETTERS 2020; 20:7774-7782. [PMID: 32914988 DOI: 10.1021/acs.nanolett.0c03385] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this Letter, a rational and stepwise method for the solution-phase synthesis of asymmetric Au split nanorings by adopting Au nanoprisms as a template has been demonstrated. The selective chemical etching of Au nanoprism tips activated the surface reactivity of edges and led to the selective deposition of Pt at the periphery of Au nanoplates. By controlling the total amount of Pt on the edges, different degrees of split Au@Pt nanorings were obtained; the subsequent Au coating around the Au@Pt scaffold eventually resulted in asymmetric Au hexagonal split nanorings. Their surface plasmonic features as a function of split degrees were investigated, including straight nanorods, bent nanorods, split nanorings, and full nanorings. The electrical field focusing using single-particle surface-enhanced Raman spectroscopy was evaluated under different polarization angles of the incident light for two different structures with the point gap and line gap between two arms.
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Affiliation(s)
| | - Sungjae Yoo
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jeongwon Kim
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jae-Myoung Kim
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Jiwoong Son
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Hyeon Seok Jeong
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Doojae Park
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Jwa-Min Nam
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Sungho Park
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
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14
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Zhang K, Lawson AP, Ellis CT, Davis MS, Murphy TE, Bechtel HA, Tischler JG, Rabin O. Plasmonic nanoarcs: a versatile platform with tunable localized surface plasmon resonances in octave intervals. OPTICS EXPRESS 2020; 28:30889-30907. [PMID: 33115080 DOI: 10.1364/oe.403728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 09/13/2020] [Indexed: 06/11/2023]
Abstract
The tunability of the longitudinal localized surface plasmon resonances (LSPRs) of metallic nanoarcs is demonstrated with key relationships identified between geometric parameters of the arcs and their resonances in the infrared. The wavelength of the LSPRs is tuned by the mid-arc length of the nanoarc. The ratio between the attenuation of the fundamental and second order LSPRs is governed by the nanoarc central angle. Beneficial for plasmonic enhancement of harmonic generation, these two resonances can be tuned independently to obtain octave intervals through the design of a non-uniform arc-width profile. Because the character of the fundamental LSPR mode in nanoarcs combines an electric and a magnetic dipole, plasmonic nanoarcs with tunable resonances can serve as versatile building blocks for chiroptical and nonlinear optical devices.
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15
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Das K, Dey J, Verma MS, Kumar M, Chandra M. Probing the role of oscillator strength and charge of exciton forming molecular J-aggregates in controlling nanoscale plasmon-exciton interactions. Phys Chem Chem Phys 2020; 22:20499-20506. [PMID: 32966416 DOI: 10.1039/d0cp02380a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we probe into the roles of exciton oscillator strength and charge of J-aggregates as well as nanoparticle's surface capping ligands in dictating the plasmon-exciton interaction. We systematically compare the plasmon-exciton coupling strengths of two hybrid plexcitonic systems involving CTAB-capped hollow gold nanoprisms (HGNs) and two different cyanine dyes, TDBC and PIC, having very similar J-band spectral positions and linewidths, but different oscillator strengths and opposite charges. Both HGN-PIC and HGN-TDBC systems display large Rabi splitting energies which are found to be extremely dependent on dye-concentrations. Interestingly, for our plexciton systems we find that there is interplay between the exciton oscillator strength and the electrostatic interaction amid dyes and HGN-surfaces in dictating the coupling strength. The oscillator strength dominates at low dye-concentrations resulting in larger Rabi splitting in the HGN-PIC system while at high concentrations, a favorable electrostatic interaction between TDBC and CTAB-capped HGN results in larger exciton population of the HGN-surface and in turn larger Rabi splitting for the HGN-TDBC system than the HGN-PIC system even though TDBC has a lower oscillator strength than PIC. The trend in Rabi splitting is just reversed when the HGN surface is modified with a negatively charged polymer, confirming the role of electrostatic interactions in influencing the plasmon-exciton coupling strength.
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Affiliation(s)
- Kamalika Das
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
| | - Jyotirban Dey
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
| | - Mrigank Singh Verma
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
| | - Manish Kumar
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
| | - Manabendra Chandra
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
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16
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Stevenson PR, Du M, Cherqui C, Bourgeois MR, Rodriguez K, Neff JR, Abreu E, Meiler IM, Tamma VA, Apkarian VA, Schatz GC, Yuen-Zhou J, Shumaker-Parry JS. Active Plasmonics and Active Chiral Plasmonics through Orientation-Dependent Multipolar Interactions. ACS NANO 2020; 14:11518-11532. [PMID: 32790353 DOI: 10.1021/acsnano.0c03971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
While most active plasmonic efforts focus on responsive metamaterials to modulate optical response, we present a simple alternative based on applied orientation control that can likely be implemented for many passive plasmonic materials. Passive plasmonic motifs are simpler to prepare but cannot be altered postfabrication. We show that such systems can be easily manipulated through substrate orientation control to generate both active plasmonic and active chiral plasmonic responses. Using gold nanocrescents as our model platform, we demonstrate tuning of optical extinction from -21% to +36% at oblique incidence relative to normal incidence. Variation of substrate orientation in relation to incident polarization is also demonstrated to controllably switch chiroptical handedness (e.g., Δg = ± 0.55). These active plasmonic responses arise from the multipolar character of resonant modes. In particular, we correlate magnetoelectric and dipole-quadrupole polarizabilities with different light-matter orientation-dependence in both near- and far-field localized surface plasmon activity. Additionally, the attribution of far-field optical response to higher-order multipoles highlights the sensitivity offered by these orientation-dependent characterization techniques to probe the influence of localized electromagnetic field gradients on a plasmonic response. The sensitivity afforded by orientation-dependent optical characterization is further observed by the manifestation in both plasmon and chiral plasmon responses of unpredicted structural nanocrescent variance (e.g., left- and right-tip asymmetry) not physically resolved through topographical imaging.
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Affiliation(s)
- Peter R Stevenson
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Matthew Du
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Charles Cherqui
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Marc R Bourgeois
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Kate Rodriguez
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Jacob R Neff
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Endora Abreu
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ilse M Meiler
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Venkata Ananth Tamma
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Vartkess Ara Apkarian
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - George C Schatz
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Joel Yuen-Zhou
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
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17
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Luo X, Zhu C, Saito M, Espulgar WV, Dou X, Terada Y, Obara A, Uchiyama S, Tamiya E. Cauliflower-Like Nanostructured Localized Surface Plasmon Resonance Biosensor Chip for Cytokine Detection. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200088] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xi Luo
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Chen Zhu
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masato Saito
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Wilfred Villariza Espulgar
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Xiaoming Dou
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Institute of Photonics and Bio-medicine (IPBM), Graduate School of Science, East China University of Science and Technology (ECUST), Shanghai 200237, P. R. China
| | - Yuhei Terada
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Ain Obara
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Sachiyo Uchiyama
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
| | - Eiichi Tamiya
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Osaka 565-0871, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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18
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Badshah MA, Koh NY, Zia AW, Abbas N, Zahra Z, Saleem MW. Recent Developments in Plasmonic Nanostructures for Metal Enhanced Fluorescence-Based Biosensing. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1749. [PMID: 32899375 PMCID: PMC7558009 DOI: 10.3390/nano10091749] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/27/2020] [Accepted: 08/31/2020] [Indexed: 01/14/2023]
Abstract
Metal-enhanced fluorescence (MEF) is a unique phenomenon of surface plasmons, where light interacts with the metallic nanostructures and produces electromagnetic fields to enhance the sensitivity of fluorescence-based detection. In particular, this enhancement in sensing capacity is of importance to many research areas, including medical diagnostics, forensic science, and biotechnology. The article covers the basic mechanism of MEF and recent developments in plasmonic nanostructures fabrication for efficient fluorescence signal enhancement that are critically reviewed. The implications of current fluorescence-based technologies for biosensors are summarized, which are in practice to detect different analytes relevant to food control, medical diagnostics, and forensic science. Furthermore, characteristics of existing fabrication methods have been compared on the basis of their resolution, design flexibility, and throughput. The future projections emphasize exploring the potential of non-conventional materials and hybrid fabrication techniques to further enhance the sensitivity of MEF-based biosensors.
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Affiliation(s)
- Mohsin Ali Badshah
- Department of Chemical and Biomolecular Engineering, University of California-Irvine, Irvine, CA 92697, USA
| | - Na Yoon Koh
- Plamica Labs, Batten Hall, 125 Western Ave, Allston, MA 02163, USA;
| | - Abdul Wasy Zia
- Institute of Structural Health Management, Faculty of Civil Engineering and Engineering Mechanics, Jiangsu University, Zhenjiang 212013, China;
| | - Naseem Abbas
- School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea;
| | - Zahra Zahra
- Department of Civil & Environmental Engineering, University of California-Irvine, Irvine, CA 92697, USA;
| | - Muhammad Wajid Saleem
- Department of Mechanical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan;
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19
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Michieli N, Balasa IG, Kalinic B, Cesca T, Mattei G. Optimal geometry for plasmonic sensing with non-interacting Au nanodisk arrays. NANOSCALE ADVANCES 2020; 2:3304-3315. [PMID: 36134286 PMCID: PMC9419756 DOI: 10.1039/d0na00208a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 06/03/2020] [Indexed: 06/16/2023]
Abstract
Combining finite elements method electrodynamic simulations and cost-effective and scalable nanofabrication techniques, we carried out a systematic investigation and optimization of the sensing properties of non-interacting gold nanodisk arrays. Such plasmonic nanoarchitectures offer a very effective platform for fast and simple, label-free, optical bio- and chemical-sensing. We varied their main geometrical parameters (diameter and height) to monitor the plasmonic resonance position and to find the configurations that maximize the sensitivity to small layers of an analyte (local sensitivity) or to the variation of the refractive index of an embedding medium (bulk sensitivity). The spectral position of the plasmonic resonance can be tuned over a wide range from the visible to the near-IR region (500-1300 nm) and state-of-the-art performances can be obtained using the optimized nanodisks; we obtained local and bulk sensitivities of S 0 = 11.9 RIU-1 and S bulk = 662 nm RIU-1, respectively. Moreover, the results of the simulations are compared with the performances of experimentally synthesized non-interacting Au nanodisk arrays fabricated by combining sparse colloidal lithography and hollow mask lithography, with the parameters obtained by the sensitivity numerical optimization. An excellent agreement between the experimental and the simulated results is demonstrated, confirming that the optimization performed with the simulations is directly applicable to nanosensors realized with cost-effective methods, due to the quite large stability basin around the maximum sensitivities.
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Affiliation(s)
- Niccolò Michieli
- Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy
| | - Ionut Gabriel Balasa
- Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy
| | - Boris Kalinic
- Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy
| | - Tiziana Cesca
- Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy
| | - Giovanni Mattei
- Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy
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20
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Kunushpayeva Z, Rapikov A, Akhmetova A, Sultangaziyev A, Dossym D, Bukasov R. Sandwich SERS immunoassay of human immunoglobulin on silicon wafer compared to traditional SERS substrate, gold film. SENSING AND BIO-SENSING RESEARCH 2020. [DOI: 10.1016/j.sbsr.2020.100355] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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21
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Goerlitzer ESA, Speichermann LE, Mirza TA, Mohammadi R, Vogel N. Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures. NANOSCALE ADVANCES 2020; 2:394-400. [PMID: 36133983 PMCID: PMC9418013 DOI: 10.1039/c9na00757a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 12/04/2019] [Indexed: 05/30/2023]
Abstract
Strong electromagnetic fields emerge around resonant plasmonic nanostructures, focusing the light in tiny volumes, usually referred to as hotspots. These hotspots are the key regions governing plasmonic applications since they strongly enhance properties, signals or energies arising from the interaction with light. For a maximum efficiency, target molecules or objects would be exclusively placed within hotspot regions. Here, we propose a reliable, universal and high-throughput method for the site-specific functionalization of hotspot regions over macroscopic areas. We demonstrate the feasibility of the approach using crescent-shaped nanostructures, which can be fabricated using colloidal lithography. These structures feature polarization-dependent resonances and near-field enhancement at their tips, which we use as target regions for the site-selective functionalization. We modify the fabrication process and introduce a defined passivation layer covering the central parts of the gold nanocrescent, which, in turn, selectively uncovers the tips and thus enables a localized functionalization with thiol molecules. We demonstrate and visualize a successful targeting of the hotspot regions by binding small gold nanoparticles and show a targeting efficiency of 90%. Finally, we demonstrate the versatility of the method exemplarily by translating the principle to different nanostructure geometries and architectures.
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Affiliation(s)
- Eric S A Goerlitzer
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Cauerstraße 4 D-91058 Erlangen Germany
| | - Lutz E Speichermann
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Cauerstraße 4 D-91058 Erlangen Germany
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Talha A Mirza
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Cauerstraße 4 D-91058 Erlangen Germany
| | - Reza Mohammadi
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Cauerstraße 4 D-91058 Erlangen Germany
| | - Nicolas Vogel
- Institute of Particle Technology (LFG), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Cauerstraße 4 D-91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander University Erlangen-Nürnberg (FAU) Haberstraße 9 D-91058 Erlangen Germany
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22
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Huh H, Trinh HD, Lee D, Yoon S. How Does a Plasmon-Induced Hot Charge Carrier Break a C-C Bond? ACS APPLIED MATERIALS & INTERFACES 2019; 11:24715-24724. [PMID: 31192584 DOI: 10.1021/acsami.9b05509] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Hot-electron chemistry at gold nanoparticle (AuNP) surfaces has received much attention recently because its understanding provides a basis for plasmonic photocatalysis and photovoltaics. Nonradiative decay of excited surface plasmons produces energetic hot charge carriers that transfer to adsorbate molecules and induce chemical reactions. Such plasmon-driven reactions, however, have been limited to a few systems, notably the dimerization of 4-aminobenzenethiol to 4,4'-dimercaptoazobenzene. In this work, we explore a new class of plasmon-driven reactions associated with a unimolecular bond cleavage process. We unveil the mechanism of the decarboxylation reaction of 4-mercaptobenzoic acid and extend the mechanism to account for the β-cleavage reaction of 4-mercaptobenzyl alcohol. Combining the construction of well-controlled nanogap systems and sensitive Raman spectroscopy with methodical changes of experimental conditions (laser wavelengths, interface materials, pH, ambient gases, etc.), we track the hot charge carriers from the formation to the transfer to reactants, which provides insights into how plasmon excitation eventually leads to the C-C bond cleavage of the molecules in the nanogap.
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Affiliation(s)
- Hyun Huh
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
| | - Hoa Duc Trinh
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
| | - Dokyung Lee
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
| | - Sangwoon Yoon
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
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23
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Mukanova Z, Gudun K, Elemessova Z, Khamkhash L, Ralchenko E, Bukasov R. Detection of Paracetamol in Water and Urea in Artificial Urine with Gold Nanoparticle@Al Foil Cost-efficient SERS Substrate. ANAL SCI 2018; 34:183-187. [PMID: 29434104 DOI: 10.2116/analsci.34.183] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We demonstrated that a cost-efficient, easy to prepare, hybrid SERS substrate-gold nanoparticles (AuNPs) on untreated Al foil (AlF) can effectively detect pharmaceuticals, such as paracetamol and clinical biomarkers, like urea in artificial urine. The limit of detection (LOD) for paracetamol on AuNPs on AlF is superior (0.1 vs. 1 mM ) to the LOD reported for SERS detection of paracetamol in the literature. For SERS detection of urea in urine, AuNPs on both Al foil and Au film performed much better than AuNPs on glass, in terms of the concentration range, linearity and LOD. However, assay on AuNPs on AlF showed a better semi-logarithmic trendline with R2 = 0.98 than an assay on AuNPs on Au film with R2 = 0.94. They have comparable sensitivity with LOD 0.024 and 0.017 M, respectively. The limit of quantification (LOQ) of the former is 0.026 M, which makes it sufficient for the quantification of urea in urine at both normal and pathophysiological (0.03 - 0.15 M) concentration.
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Affiliation(s)
- Zhansaya Mukanova
- Chemistry Department, School of Science and Technology, Nazarbayev University
| | - Kristina Gudun
- Chemistry Department, School of Science and Technology, Nazarbayev University
| | - Zarina Elemessova
- Chemistry Department, School of Science and Technology, Nazarbayev University
| | - Laura Khamkhash
- Chemistry Department, School of Science and Technology, Nazarbayev University
| | - Ekaterina Ralchenko
- Chemistry Department, School of Science and Technology, Nazarbayev University
| | - Rostislav Bukasov
- Chemistry Department, School of Science and Technology, Nazarbayev University
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24
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La Spada L, Vegni L. Electromagnetic Nanoparticles for Sensing and Medical Diagnostic Applications. MATERIALS 2018; 11:ma11040603. [PMID: 29652853 PMCID: PMC5951487 DOI: 10.3390/ma11040603] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 04/04/2018] [Accepted: 04/09/2018] [Indexed: 11/16/2022]
Abstract
A modeling and design approach is proposed for nanoparticle-based electromagnetic devices. First, the structure properties were analytically studied using Maxwell's equations. The method provides us a robust link between nanoparticles electromagnetic response (amplitude and phase) and their geometrical characteristics (shape, geometry, and dimensions). Secondly, new designs based on "metamaterial" concept are proposed, demonstrating great performances in terms of wide-angle range functionality and multi/wide behavior, compared to conventional devices working at the same frequencies. The approach offers potential applications to build-up new advanced platforms for sensing and medical diagnostics. Therefore, in the final part of the article, some practical examples are reported such as cancer detection, water content measurements, chemical analysis, glucose concentration measurements and blood diseases monitoring.
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Affiliation(s)
- Luigi La Spada
- School of Computing, Electronics and Mathematics, Coventry University, Coventry CV1 5FB, UK.
| | - Lucio Vegni
- Department of Engineering, University of Roma Tre, Via Vito Volterra 62, 00146 Rome, Italy.
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25
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Yang X, Guo W, Wang X, Liao M, Gao P, Ye J. Fabrication of highly ordered 2D metallic arrays with disc-in-hole binary nanostructures via a newly developed nanosphere lithography. NANOTECHNOLOGY 2017; 28:474001. [PMID: 29098987 DOI: 10.1088/1361-6528/aa929e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
2D metallic arrays with binary nanostructures derived from a nanosphere lithography (NSL) method have been rarely reported. Here, we demonstrate a novel NSL strategy to fabricate highly ordered 2D gold arrays with disc-in-hole binary (DIHB) nanostructures in large scale by employing a sacrificing layer combined with a three-step lift-off process. The structural parameters of the resultant DIHB arrays, such as periodicity, hole diameter, disc diameter and thicknesses can be facilely controlled by tuning the nanospheres size, etching condition, deposition angle and duration, respectively. Due to the intimate interactions between two subcomponents, the DIHB arrays exhibit both an extraordinary high surface-enhanced Raman scattering enhancement factor up to 5 × 108 and a low sheet resistance down to 1.7 Ω/sq. Moreover, the DIHB array can also be used as a metal catalyzed chemical etching catalytic pattern to create vertically-aligned Si nano-tube arrays for anti-reflectance application. This strategy provides a universal route for synthesizing other diverse binary nanostructures with controlled morphology, and thus expands the applications of the NSL to prepare ordered nanostructures with multi-function.
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Affiliation(s)
- Xi Yang
- Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China
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26
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Hazra B, Das K, Chandra M. Large second harmonic generation from hollow gold nanoprisms: role of plasmon hybridization and structural effects. Phys Chem Chem Phys 2017; 19:18394-18399. [PMID: 28678252 DOI: 10.1039/c7cp03478d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure and morphology of nanomateials strongly influence their nonlinear optical properties. In this work, we report a systematic investigation of second order nonlinear optical responses and their structural dependencies in the case of a plasmonically hybrid nanostructure, hollow gold nanoprisms (HGNs). The first hyperpolarizabilities (β) of the HGNs have been measured using the two-photon Rayleigh scattering (TPRS) technique. The measured hyperpolarizability values are extremely large for the HGNs, larger than those for gold nanospheres or gold nanorods with similar size and surface area. The larger β values of the HGNs are due to a strong local electromagnetic field enhancement owing to efficient plasmon hybridization. We find that the β values for the HGNs studied here have a purely local dipolar origin, as confirmed by their surface area dependence. Moreover, the SH responses of the HGNs are found to be a linear function of their aspect ratios. Our results suggest that the nonlinear optical (NLO) properties of HGNs can be tailor made and utilized to suit various practical applications.
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Affiliation(s)
- Bidhan Hazra
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
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Neubrech F, Huck C, Weber K, Pucci A, Giessen H. Surface-Enhanced Infrared Spectroscopy Using Resonant Nanoantennas. Chem Rev 2017; 117:5110-5145. [PMID: 28358482 DOI: 10.1021/acs.chemrev.6b00743] [Citation(s) in RCA: 252] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Infrared spectroscopy is a powerful tool widely used in research and industry for a label-free and unambiguous identification of molecular species. Inconveniently, its application to spectroscopic analysis of minute amounts of materials, for example, in sensing applications, is hampered by the low infrared absorption cross-sections. Surface-enhanced infrared spectroscopy using resonant metal nanoantennas, or short "resonant SEIRA", overcomes this limitation. Resonantly excited, such metal nanostructures feature collective oscillations of electrons (plasmons), providing huge electromagnetic fields on the nanometer scale. Infrared vibrations of molecules located in these fields are enhanced by orders of magnitude enabling a spectroscopic characterization with unprecedented sensitivity. In this Review, we introduce the concept of resonant SEIRA and discuss the underlying physics, particularly, the resonant coupling between molecular and antenna excitations as well as the spatial extent of the enhancement and its scaling with frequency. On the basis of these fundamentals, different routes to maximize the SEIRA enhancement are reviewed including the choice of nanostructures geometries, arrangements, and materials. Furthermore, first applications such as the detection of proteins, the monitoring of dynamic processes, and hyperspectral infrared chemical imaging are discussed, demonstrating the sensitivity and broad applicability of resonant SEIRA.
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Affiliation(s)
- Frank Neubrech
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, Stuttgart 70569, Germany.,Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, Heidelberg 69120, Germany
| | - Christian Huck
- Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, Heidelberg 69120, Germany
| | - Ksenia Weber
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, Stuttgart 70569, Germany
| | - Annemarie Pucci
- Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, Heidelberg 69120, Germany
| | - Harald Giessen
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, Stuttgart 70569, Germany
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Das K, Hazra B, Chandra M. Exploring the coherent interaction in a hybrid system of hollow gold nanoprisms and cyanine dye J-aggregates: role of plasmon-hybridization mediated local electric-field enhancement. Phys Chem Chem Phys 2017; 19:27997-28005. [DOI: 10.1039/c7cp05455f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this work, we probed the possibility of observing strong plasmon–exciton interactions in hollow gold nanoprism–J-aggregate nanocomposites.
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Affiliation(s)
- Kamalika Das
- Department of Chemistry, Indian Institute of Technology
- Kanpur
- India
| | - Bidhan Hazra
- Department of Chemistry, Indian Institute of Technology
- Kanpur
- India
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Kandil SM, Eshrah IA, El Babli IS, Badawi AH. Plasmon hybridization in split ring nanosandwich for refractive index sensing- Numerical Investigation. OPTICS EXPRESS 2016; 24:30201-30214. [PMID: 28059296 DOI: 10.1364/oe.24.030201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this paper, a numerical investigation of a new nanosandwich structure suitable for use in refractive index sensing is presented. The split ring nanosandwich consists of a stack of two gold split rings separated by a SiO2 disk spacer where the gaps in the upper and lower split rings are in perpendicular axes. The optical properties of the structure are described using the plasmon hybridization picture. This structure shows a high tunability of the optical response due to its strong hybridized modes. Its sensitivity is explored as a function of its dimensions showing strong field enhancement and high refractive index sensitivity reaching 3024 nm/RIU and FOM of 1.4.
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Lin L, Wang M, Wei X, Peng X, Xie C, Zheng Y. Photoswitchable Rabi Splitting in Hybrid Plasmon-Waveguide Modes. NANO LETTERS 2016; 16:7655-7663. [PMID: 27960522 DOI: 10.1021/acs.nanolett.6b03702] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Rabi splitting that arises from strong plasmon-molecule coupling has attracted tremendous interests. However, it has remained elusive to integrate Rabi splitting into the hybrid plasmon-waveguide modes (HPWMs), which have advantages of both subwavelength light confinement of surface plasmons and long-range propagation of guided modes in dielectric waveguides. Herein, we explore a new type of HPWMs based on hybrid systems of Al nanodisk arrays covered by PMMA thin films that are doped with photochromic molecules and demonstrate the photoswitchable Rabi splitting with a maximum splitting energy of 572 meV in the HPWMs by controlling the photoisomerization of the molecules. Through our experimental measurements combined with finite-difference time-domain (FDTD) simulations, we reveal that the photoswitchable Rabi splitting arises from the switchable coupling between the HPWMs and molecular excitons. By harnessing the photoswitchable Rabi splitting, we develop all-optical light modulators and rewritable waveguides. The demonstration of Rabi splitting in the HPWMs will further advance scientific research and device applications of hybrid plasmon-molecule systems.
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Affiliation(s)
- Linhan Lin
- Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
- Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Mingsong Wang
- Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Xiaoling Wei
- Department of Biomedical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Xiaolei Peng
- Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Chong Xie
- Department of Biomedical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Yuebing Zheng
- Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
- Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States
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Zhou B, Xiao X, Liu T, Gao Y, Huang Y, Wen W. Real-time concentration monitoring in microfluidic system via plasmonic nanocrescent arrays. Biosens Bioelectron 2016; 77:385-92. [DOI: 10.1016/j.bios.2015.09.054] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 09/03/2015] [Accepted: 09/23/2015] [Indexed: 01/09/2023]
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Jahn M, Patze S, Hidi IJ, Knipper R, Radu AI, Mühlig A, Yüksel S, Peksa V, Weber K, Mayerhöfer T, Cialla-May D, Popp J. Plasmonic nanostructures for surface enhanced spectroscopic methods. Analyst 2016; 141:756-93. [DOI: 10.1039/c5an02057c] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The development within the last five years in the field of surface enhanced spectroscopy methods was comprehensively reviewed.
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Tadepalli S, Kuang Z, Jiang Q, Liu KK, Fisher MA, Morrissey JJ, Kharasch ED, Slocik JM, Naik RR, Singamaneni S. Peptide Functionalized Gold Nanorods for the Sensitive Detection of a Cardiac Biomarker Using Plasmonic Paper Devices. Sci Rep 2015; 5:16206. [PMID: 26552720 PMCID: PMC4639779 DOI: 10.1038/srep16206] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 09/16/2015] [Indexed: 12/13/2022] Open
Abstract
The sensitivity of localized surface plasmon resonance (LSPR) of metal nanostructures to adsorbates lends itself to a powerful class of label-free biosensors. Optical properties of plasmonic nanostructures are dependent on the geometrical features and the local dielectric environment. The exponential decay of the sensitivity from the surface of the plasmonic nanotransducer calls for the careful consideration in its design with particular attention to the size of the recognition and analyte layers. In this study, we demonstrate that short peptides as biorecognition elements (BRE) compared to larger antibodies as target capture agents offer several advantages. Using a bioplasmonic paper device (BPD), we demonstrate the selective and sensitive detection of the cardiac biomarker troponin I (cTnI). The smaller sized peptide provides higher sensitivity and a lower detection limit using a BPD. Furthermore, the excellent shelf-life and thermal stability of peptide-based LSPR sensors, which precludes the need for special storage conditions, makes it ideal for use in resource-limited settings.
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Affiliation(s)
- Sirimuvva Tadepalli
- Institute of Material Science and Engineering and Department of Mechanical Engineering and Material Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Zhifeng Kuang
- Soft Matter Materials Branch, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Dayton, OH 45433, USA
| | - Qisheng Jiang
- Institute of Material Science and Engineering and Department of Mechanical Engineering and Material Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Keng-Ku Liu
- Institute of Material Science and Engineering and Department of Mechanical Engineering and Material Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Marilee A. Fisher
- Department of Anesthesiology, Division of Clinical and Translational Research, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Jeremiah J. Morrissey
- Department of Anesthesiology, Division of Clinical and Translational Research, Washington University in St. Louis, St. Louis, MO 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Evan D. Kharasch
- Department of Anesthesiology, Division of Clinical and Translational Research, Washington University in St. Louis, St. Louis, MO 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO 63110, USA
- Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Joseph M. Slocik
- Soft Matter Materials Branch, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Dayton, OH 45433, USA
| | - Rajesh R. Naik
- Soft Matter Materials Branch, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Dayton, OH 45433, USA
| | - Srikanth Singamaneni
- Institute of Material Science and Engineering and Department of Mechanical Engineering and Material Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO 63110, USA
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Peptide Functionalized Gold Nanorods for the Sensitive Detection of a Cardiac Biomarker Using Plasmonic Paper Devices. Sci Rep 2015. [DOI: 10.1038/srep1620610.1038/srep16206] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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Xia Z, Li P, Wang Y, Song T, Zhang Q, Sun B. Solution-Processed Gold Nanorods Integrated with Graphene for Near-Infrared Photodetection via Hot Carrier Injection. ACS APPLIED MATERIALS & INTERFACES 2015; 7:24136-41. [PMID: 26468669 DOI: 10.1021/acsami.5b07299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Graphene-based photodetectors have attracted wide interest due to their high-speed, wide-band photodetection and potential as highly energy-efficient integrated devices. However, the inherently low-absorption cross-section and nonselective spectra response hinder its utilization as a high-performance photodetector. Here, we report a solution-processed and high-spectral-selectivity photodetector based on a gold nanorods (Au NRs)-graphene heterojunction with near-infrared (NIR) detection. Au NRs are used as a subwavelength scattering source, and nanoantennas with wide light absorption range from ultraviolet to near-infrared via tuning their geometry. Photons couple into Au NRs, exciting resonant plasmas and generating hot carriers that pump into graphene, resulting in selective NIR photodetection. A flexible NIR photodetector is also demonstrated based on this simple structure. Au NRs can achieve variable resonance frequencies by the design of different aspect ratios as nanoantennae for graphene, which promises the selective amplifying of the photoresponsivity and enables highly specific detection.
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Affiliation(s)
- Zhouhui Xia
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
| | - Pengfei Li
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
| | - Yusheng Wang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
| | - Tao Song
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
| | - Qiao Zhang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
| | - Baoquan Sun
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, 215123, PR China
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Lin L, Zheng Y. Engineering of parallel plasmonic-photonic interactions for on-chip refractive index sensors. NANOSCALE 2015; 7:12205-12214. [PMID: 26133011 DOI: 10.1039/c5nr03159a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Ultra-narrow linewidth in the extinction spectrum of noble metal nanoparticle arrays induced by the lattice plasmon resonances (LPRs) is of great significance for applications in plasmonic lasers and plasmonic sensors. However, the challenge of sustaining LPRs in an asymmetric environment greatly restricts their practical applications, especially for high-performance on-chip plasmonic sensors. Herein, we fully study the parallel plasmonic-photonic interactions in both the Au nanodisk arrays (NDAs) and the core/shell SiO2/Au nanocylinder arrays (NCAs). Different from the dipolar interactions in the conventionally studied orthogonal coupling, the horizontal propagating electric field introduces the out-of-plane "hot spots" and results in electric field delocalization. Through controlling the aspect ratio to manipulate the "hot spot" distributions of the localized surface plasmon resonances (LSPRs) in the NCAs, we demonstrate a high-performance refractive index sensor with a wide dynamic range of refractive indexes ranging from 1.0 to 1.5. Both high figure of merit (FOM) and high signal-to-noise ratio (SNR) can be maintained under these detectable refractive indices. Furthermore, the electromagnetic field distributions confirm that the high FOM in the wide dynamic range is attributed to the parallel coupling between the superstrate diffraction orders and the height-induced LSPR modes. Our study on the near-field "hot-spot" engineering and far-field parallel coupling paves the way towards improved understanding of the parallel LPRs and the design of high-performance on-chip refractive index sensors.
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Affiliation(s)
- Linhan Lin
- Department of Mechanical Engineering, Materials Science & Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA.
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Chen K, Rajeeva BB, Wu Z, Rukavina M, Dao TD, Ishii S, Aono M, Nagao T, Zheng Y. Moiré Nanosphere Lithography. ACS NANO 2015; 9:6031-6040. [PMID: 26022616 DOI: 10.1021/acsnano.5b00978] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have developed moiré nanosphere lithography (M-NSL), which incorporates in-plane rotation between neighboring monolayers, to extend the patterning capability of conventional nanosphere lithography (NSL). NSL, which uses self-assembled layers of monodisperse micro/nanospheres as masks, is a low-cost, scalable nanofabrication technique and has been widely employed to fabricate various nanoparticle arrays. Combination with dry etching and/or angled deposition has greatly enriched the family of nanoparticles NSL can yield. In this work, we introduce a variant of this technique, which uses sequential stacking of polystyrene nanosphere monolayers to form a bilayer crystal instead of conventional spontaneous self-assembly. Sequential stacking leads to the formation of moiré patterns other than the usually observed thermodynamically stable configurations. Subsequent O2 plasma etching results in a variety of complex nanostructures. Using the etched moiré patterns as masks, we have fabricated complementary gold nanostructures and studied their optical properties. We believe this facile technique provides a strategy to fabricate complex nanostructures or metasurfaces.
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Affiliation(s)
- Kai Chen
- †National Institute for Materials Science, International Center for Material Nanoarchitectonics (MANA), Tsukuba, 305-0044, Japan
- ‡CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Bharath Bangalore Rajeeva
- §Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Zilong Wu
- §Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Michael Rukavina
- §Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Thang Duy Dao
- †National Institute for Materials Science, International Center for Material Nanoarchitectonics (MANA), Tsukuba, 305-0044, Japan
- ‡CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Satoshi Ishii
- †National Institute for Materials Science, International Center for Material Nanoarchitectonics (MANA), Tsukuba, 305-0044, Japan
- ‡CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Masakazu Aono
- †National Institute for Materials Science, International Center for Material Nanoarchitectonics (MANA), Tsukuba, 305-0044, Japan
- ‡CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Tadaaki Nagao
- †National Institute for Materials Science, International Center for Material Nanoarchitectonics (MANA), Tsukuba, 305-0044, Japan
- ‡CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Yuebing Zheng
- §Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
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Jalani G, Cerruti M. Nano graphene oxide-wrapped gold nanostars as ultrasensitive and stable SERS nanoprobes. NANOSCALE 2015; 7:9990-7. [PMID: 25981393 DOI: 10.1039/c4nr07473d] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report a facile method to synthesize highly branched gold nanostars wrapped with nano graphene oxide (nGO) sheets with or without the addition of Raman dyes, as nanoprobes with high SERS activity. Both cysteamine and nGO are added to gold nanostars; the positively charged amino groups help self-assembly of nGO flakes around the nanostars. This increases the Raman signal of nGO by 5.3 folds compared to samples in which nGO is in contact with the nanostars but does not wrap them. We also prepare dye-based SERS nanoprobes by sandwiching a typical Raman reporter such as Rhodamine B (RhB), Crystal Violet (CV) and Rhodamine 6G (R6G) between the nanostars and the nGO coating. The Raman signals of RhB are 5.2 times larger when sandwiched between nGO and nanostars than if the molecules are just adsorbed on the nanostar surface, and similar enhancements are observed for the other dyes. In addition to improving SERS efficiency, the wrapping greatly improves the stability of the dye-based nanoprobes, showing a reproducible Raman signal of RhB for over a week in simulated body fluids at 37 °C. High SERS signal, facile fabrication method and excellent stability make these nanoprobes highly promising for SERS-based biosensing and bioimaging applications.
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Affiliation(s)
- Ghulam Jalani
- Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada.
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Kang G, Matikainen A, Stenberg P, Färm E, Li P, Ritala M, Vahimaa P, Honkanen S, Tan X. High Aspect-Ratio Iridium-Coated Nanopillars for Highly Reproducible Surface-Enhanced Raman Scattering (SERS). ACS APPLIED MATERIALS & INTERFACES 2015; 7:11452-11459. [PMID: 25961706 DOI: 10.1021/acsami.5b02206] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A variety of different gold and silver nanostructures have been proposed over the years as high sensitivity surface-enhanced Raman scattering (SERS) sensors. However, efficient use of SERS has been hindered by the difficulty of realizing SERS substrates that provide reproducible SERS response over the whole active area. Here, we show that atomic layer deposition (ALD) grown iridium can be used to produce highly reliable SERS substrates. The substrates are based on a periodic array of high aspect-ratio iridium coated nanopillars that feature efficient and symmetrically distributed hot spots within the interpillar gaps (gap width<10 nm). We show that the enhancement with the iridium based nanostructures is of significant magnitude and it equals the enhancement of silver based reference substrates. Most notably, we demonstrate that the ordered and well-defined plasmonic nanopillars offer a measurement-to-measurement variability of 5%, which paves the way for truly quantitative SERS measurements.
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Affiliation(s)
- Guoguo Kang
- †School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
- ‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland
| | - Antti Matikainen
- ‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland
| | - Petri Stenberg
- ‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland
| | - Elina Färm
- §Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Peng Li
- †School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
| | - Mikko Ritala
- §Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Pasi Vahimaa
- ‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland
| | - Seppo Honkanen
- ‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland
| | - Xiaodi Tan
- †School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
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Křápek V, Koh AL, Břínek L, Hrtoň M, Tomanec O, Kalousek R, Maier SA, Šikola T. Spatially resolved electron energy loss spectroscopy of crescent-shaped plasmonic antennas. OPTICS EXPRESS 2015; 23:11855-11867. [PMID: 25969276 DOI: 10.1364/oe.23.011855] [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
We present a study of the optical properties of gold crescent-shaped antennas by means of electron energy loss spectroscopy. These structures exhibit particularly large field enhancement near their sharp features, support two non-degenerate dipolar (i.e., optically active) localised surface plasmon resonances, and are widely tunable by a choice of their shape and dimensions. Depending on the volume and shape, we resolved up to four plasmon resonances in metallic structures under study in the energy range of 0.8 - 2.4 eV: two dipolar and quadrupolar mode and a multimodal assembly. The boundary-element-method calculations reproduced the observed spectra and helped to identify the character of the resonances. The two lowest modes are of particular importance owing to their dipolar nature. Remarkably, they are both concentrated near the tips of the crescent, spectrally well resolved and their energies can be tuned between 0.8 - 1.5 eV and 1.2 - 2.0 eV, respectively. As the lower spectral range covers the telecommunication wavelengths 1.30 and 1.55 μm, we envisage the possible use of such nanostructures in infrared communication technology.
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Wang T, Lang J, Zhao Y, Su Y, Zhao Y, Wang X. Simultaneous doping and heterojunction of silver on Na2Ta2O6nanoparticles for visible light driven photocatalysis: the relationship between tunable optical absorption, defect chemistry and photocatalytic activity. CrystEngComm 2015. [DOI: 10.1039/c5ce01125f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jia H, Zhou H, Jia C, Zeng P, Zhang F, Xie M. Controlled synthesis of gold nanorings with structural defects assisted by elastic induction of mixed surfactants. CrystEngComm 2015. [DOI: 10.1039/c5ce00474h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Cho K, Loget G, Corn RM. Lithographically Patterned Nanoscale Electrodeposition of Plasmonic, Bimetallic, Semiconductor, Magnetic, and Polymer Nanoring Arrays. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2014; 118:28993-29000. [PMID: 25553204 PMCID: PMC4275153 DOI: 10.1021/jp501783z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 06/16/2014] [Indexed: 06/01/2023]
Abstract
Large area arrays of magnetic, semiconducting, and insulating nanorings were created by coupling colloidal lithography with nanoscale electrodeposition. This versatile nanoscale fabrication process allows for the independent tuning of the spacing, diameter, and width of the nanorings with typical values of 1.0 μm, 750 nm, and 100 nm, respectively, and was used to form nanorings from a host of materials: Ni, Co, bimetallic Ni/Au, CdSe, and polydopamine. These nanoring arrays have potential applications in memory storage, optical materials, and biosensing. A modified version of this nanoscale electrodeposition process was also used to create arrays of split gold nanorings. The size of the split nanoring opening was controlled by the angle of photoresist exposure during the fabrication process and could be varied from 50% down to 10% of the ring circumference. The large area (cm2 scale) gold split nanoring array surfaces exhibited strong polarization-dependent plasmonic absorption bands for wavelengths from 1 to 5 μm. Plasmonic nanoscale split ring arrays are potentially useful as tunable dichroic materials throughout the infrared and near-infrared spectral regions.
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Recent approaches toward creation of hot spots for SERS detection. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2014. [DOI: 10.1016/j.jphotochemrev.2014.09.001] [Citation(s) in RCA: 216] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Optimal geometric parameters of ordered arrays of nanoprisms for enhanced sensitivity in localized plasmon based sensors. Biosens Bioelectron 2014; 65:346-53. [PMID: 25461180 DOI: 10.1016/j.bios.2014.10.064] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 10/24/2014] [Accepted: 10/26/2014] [Indexed: 11/23/2022]
Abstract
Plasmonic sensors based on ordered arrays of nanoprisms are optimized in terms of their geometric parameters like size, height, aspect ratio for Au, Ag or Au0.5-Ag0.5 alloy to be used in the visible or near IR spectral range. The two figures of merit used for the optimization are the bulk and the surface sensitivity: the first is important for optimizing the sensing to large volume analytes whereas the latter is more important when dealing with small bio-molecules immobilized in close proximity to the nanoparticle surface. A comparison is made between experimentally obtained nanoprisms arrays and simulated ones by using Finite Elements Methods (FEM) techniques.
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Qian K, Sweeny BC, Johnston-Peck AC, Niu W, Graham JO, DuChene JS, Qiu J, Wang YC, Engelhard MH, Su D, Stach EA, Wei WD. Surface Plasmon-Driven Water Reduction: Gold Nanoparticle Size Matters. J Am Chem Soc 2014; 136:9842-5. [DOI: 10.1021/ja504097v] [Citation(s) in RCA: 262] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kun Qian
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Brendan C. Sweeny
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Aaron C. Johnston-Peck
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Wenxin Niu
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Jeremy O. Graham
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Joseph S. DuChene
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Jingjing Qiu
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Yi-Chung Wang
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Mark H. Engelhard
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Dong Su
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Eric A. Stach
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Wei David Wei
- Department
of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
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Wang YC, DuChene JS, Huo F, Wei WD. An in situ approach for facile fabrication of robust and scalable SERS substrates. NANOSCALE 2014; 6:7232-7236. [PMID: 24896881 DOI: 10.1039/c4nr01712a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The widespread implementation of surface enhanced Raman scattering (SERS) techniques for chemical and biological detection requires an inexpensive, yet robust SERS substrate with high sensitivity and reproducibility. To that end, we present a facile method to fabricate plasmonic SERS substrates with well-distributed SERS "hot spots" on a large scale with reproducible SERS enhancement factors of ∼10(8) for the Raman probe molecule 4-aminobenzenethiol (4-ABT). The SERS enhancement is attributed to the synergistic interactions between the strong plasmonic coupling among the assembled Au NPs and the structure-associated tip enhancement. Additionally, these mechanically-flexible substrates exhibit remarkably reproducible SERS signals, demonstrating the merits of our methodology. Our approach illustrates the potential opportunities for fabricating robust, commercially-viable SERS substrates with well-distributed "hot spots" on a large scale while avoiding costly vacuum deposition technologies.
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Affiliation(s)
- Yi-Chung Wang
- Department of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, FL 32611, USA.
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Siegfried T, Wang L, Ekinci Y, Martin OJF, Sigg H. Metal double layers with sub-10 nm channels. ACS NANO 2014; 8:3700-3706. [PMID: 24617545 DOI: 10.1021/nn500375z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Double-layer plasmonic nanostructures are fabricated by depositing metal at normal incidence onto various resist masks, forming an antenna layer on top of the resist post and a hole layer on the substrate. Antenna plasmon resonances are found to couple to the hole layer, inducing image charges which enhance the near-field for small layer spacings. For continued evaporation above the resist height, a sub-10 nm gap channel develops due to a self-aligned process and a minimal undercut of the resist sidewall. For such double layers with nanogap channels, the average surface-enhanced Raman scattering intensity is improved by a factor in excess of 60 in comparison to a single-layer antenna with the same dimensions. The proposed design principle is compatible with low-cost fabrication, straightforward to implement, and applicable over large areas. Moreover, it can be applied for any particular antenna shape to improve the signals in surface-enhanced spectroscopy applications.
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Affiliation(s)
- Thomas Siegfried
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut , 5232 Villigen-PSI, Switzerland
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Frederiksen M, Sutherland DS. Direct modification of colloidal hole-masks for locally ordered hetero-assemblies of nanostructures over large areas. NANOSCALE 2014; 6:731-735. [PMID: 24297162 DOI: 10.1039/c3nr03871h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have developed a direct mask modification method applicable in hole-mask nanostructure fabrication. It is demonstrated that by using this technique the size, material, relative location and ordering of individual subunits can be controlled and varied independently to generate hetero-assemblies of nanostructures including chiral structures over large areas.
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Affiliation(s)
- Maj Frederiksen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark.
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Liu F, Wong MMK, Chiu SK, Lin H, Ho JC, Pang SW. Effects of nanoparticle size and cell type on high sensitivity cell detection using a localized surface plasmon resonance biosensor. Biosens Bioelectron 2013; 55:141-8. [PMID: 24373953 DOI: 10.1016/j.bios.2013.11.075] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 11/28/2013] [Accepted: 11/29/2013] [Indexed: 10/25/2022]
Abstract
A localized surface plasmon resonance (LSPR) effect was used to distinguish cell concentration on ordered arrays of Au nanoparticles (NPs) on glass substrates. Human-derived retinal pigment epithelial RPE-1 cells with flatter bodies and higher confluency were compared with breast cancer MCF-7 cells. Nanosphere lithography was used to form Au NPs with average diameters of 500 and 60 nm in order to compare cell detection range, resonance peak shift, and cell concentration sensitivity. A larger cell concentration range was detected on the larger 500 nm Au NPs compared to 60 nm Au NPs (8.56 × 10(3)-1.09 × 10(6) vs. 3.43 × 10(4)-2.73 × 10(5)cells/ml). Resonance peak shift could distinguish RPE-1 from MCF-7 cells on both Au NPs. RPE-1 cells consistently displayed larger resonance peak shifts compared to MCF-7 cells until the detection became saturated at higher concentration. For both types of cells, higher concentration sensitivity in the range of ~10(4)-10(6)cells/ml was observed on 500 nm compared to 60 nm Au NPs. Our results show that cells on Au NPs can be detected in a large range and at low concentration. Optimal cell sensing can be achieved by altering the dimensions of Au NPs according to different cell characteristics and concentrations.
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Affiliation(s)
- Fei Liu
- Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong; Department of Electronic Information Engineering, Tianjin University, Tianjin 300072, China
| | - Matthew Man-Kin Wong
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Sung-Kay Chiu
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Hao Lin
- Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Johnny C Ho
- Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Stella W Pang
- Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong; Center for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong.
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