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Lu J, Lu JH, Liu H, Liu B, Gong L, Tok ES, Loh KP, Sow CH. Microlandscaping of Au nanoparticles on few-layer MoS2 films for chemical sensing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1792-800. [PMID: 25581016 DOI: 10.1002/smll.201402591] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 11/18/2014] [Indexed: 05/13/2023]
Abstract
Surface modification or decoration of ultrathin MoS2 films with chemical moieties is appealing since nanointerfacing can functionalize MoS2 films with bonus potentials. In this work, a facile and effective method for microlandscaping of Au nanoparticles (NPs) on few-layer MoS2 films is developed. This approach first employs a focused laser beam to premodify the MoS2 films to achieve active surface domains with unbound sulfur. When the activated surface is subsequently immersed in AuCl3 solution, Au NPs are found to preferentially decorate onto the modified regions. As a result, Au NPs can be selectively and locally anchored onto designated regions on the MoS2 surface. With a scanning laser beam, microlandscapes comprising of Au NPs decorated on laser-defined micropatterns are constructed. By varying the laser power, reaction time and thickness of the MoS2 films, the size and density of the NPs can be controlled. The resulting hybrid materials are demonstrated as efficient Raman active surfaces for the detection of aromatic molecules with high sensitivity.
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Affiliation(s)
- Junpeng Lu
- Department of Physics, 2 Science Drive 3, National University of Singapore, 117542, Singapore
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52
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Guo P, Sikdar D, Huang X, Si KJ, Xiong W, Gong S, Yap LW, Premaratne M, Cheng W. Plasmonic core-shell nanoparticles for SERS detection of the pesticide thiram: size- and shape-dependent Raman enhancement. NANOSCALE 2015; 7:2862-8. [PMID: 25599516 DOI: 10.1039/c4nr06429a] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We systematically investigated the size- and shape-dependent SERS activities of plasmonic core-shell nanoparticles towards detection of the pesticide thiram. Monodisperse Au@Ag nanocubes (NCs) and Au@Ag nanocuboids (NBs) were synthesized and their Ag shell thickness was precisely adjusted from ∼1 nm to ∼16 nm. All these nanoparticles were used as SERS substrates for thiram detection, and the Raman intensities with three different lasers (514 nm, 633 nm and 782 nm) were recorded and compared. Our results clearly show that: (1) the excitation wavelength discriminated particle shapes regardless of particle sizes, and the maximized Raman enhancement was observed when the excitation wavelength approaches the SERS peak (provided there is significant local electric field confinement on the plasmonic nanostructures at that wavelength); (2) at the optimized laser wavelength, the maximum Raman enhancement was achieved at a certain threshold of particle size (or silver coating thickness). By exciting particles at their optimized sizes with the corresponding optimized laser wavelengths, we achieved a detection limit of roughly around 100 pM and 80 pM for NCs and NBs, respectively.
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Affiliation(s)
- Pengzhen Guo
- Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang Province 150080, P.R. China.
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53
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Weber V, Feis A, Gellini C, Pilot R, Salvi PR, Signorini R. Far- and near-field properties of gold nanoshells studied by photoacoustic and surface-enhanced Raman spectroscopies. Phys Chem Chem Phys 2015; 17:21190-7. [PMID: 25559555 DOI: 10.1039/c4cp05054a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gold nanoshells, with a silica core and different core and shell dimensions, have been extensively investigated. Optical far-field properties, namely extinction and absorption, have been separately determined by means of spectrophotometry and photoacoustic spectroscopy, respectively, in the 440-900 nm range. The enhancement factor for surface-enhanced Raman scattering, which is related to near-field effects, has been measured from 568 to 920 nm. The absorption contribution to extinction decreases as the overall diameter increases. Moreover, absorption and scattering display different spectral distributions, the latter being red shifted. The Surface Enhanced Raman Scattering enhancement profile, measured using thiobenzoic acid as a Raman probe, is further shifted to the red. The latter result suggests that the enhancement is dominated by the presence of hot spots, which are possibly related to the surface roughness of gold nanoshell particles.
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Affiliation(s)
- V Weber
- Consorzio INSTM and Department of Chemical Science, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
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54
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Cai Q, Li LH, Yu Y, Liu Y, Huang S, Chen Y, Watanabe K, Taniguchi T. Boron nitride nanosheets as improved and reusable substrates for gold nanoparticles enabled surface enhanced Raman spectroscopy. Phys Chem Chem Phys 2015; 17:7761-6. [DOI: 10.1039/c5cp00532a] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Boron nitride nanosheets covered by gold nanoparticles are controllably fabricated for highly-sensitive and reusable substrates for surface enhanced Raman spectroscopy.
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Affiliation(s)
- Qiran Cai
- Institute for Frontier Materials
- Deakin University
- Waurn Ponds
- Australia
| | - Lu Hua Li
- Institute for Frontier Materials
- Deakin University
- Waurn Ponds
- Australia
| | - Yuanlie Yu
- Advanced Membranes & Porous Materials Center
- King Abdullah University of Science & Technology
- Thuwal 23955-6900
- Kingdom of Saudi Arabia
| | - Yun Liu
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Shaoming Huang
- Nanomaterials and Chemistry Key Laboratory
- Wenzhou University
- Wenzhou 325027
- China
| | - Ying Chen
- Institute for Frontier Materials
- Deakin University
- Waurn Ponds
- Australia
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55
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Fateixa S, Soares SF, Daniel-da-Silva AL, Nogueira HIS, Trindade T. Silver-gelatine bionanocomposites for qualitative detection of a pesticide by SERS. Analyst 2015; 140:1693-701. [DOI: 10.1039/c4an02105c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Gelatine based nanocomposites incorporating Ag nanoparticles as a new SERS platform for the detection of diethyldithiocarbamate (EtDTC), aiming controlled release applications.
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Affiliation(s)
- S. Fateixa
- Department of Chemistry and CICECO
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - S. F. Soares
- Department of Chemistry and CICECO
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | | | - H. I. S. Nogueira
- Department of Chemistry and CICECO
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - T. Trindade
- Department of Chemistry and CICECO
- University of Aveiro
- 3810-193 Aveiro
- Portugal
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56
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Xue X, Xu D, Ruan W, Chen L, Chang L, Zhao B. Enhanced Raman scattering when scatterer molecules located in TiO2/Ag nanojunctions. RSC Adv 2015. [DOI: 10.1039/c5ra11667h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Raman spectrum of TiO2/4-Mpy/Ag sandwich structure was significantly enhanced and the SERS mechanism was well studied.
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Affiliation(s)
- Xiangxin Xue
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials
- Ministry of Education
- Jilin Normal University
- Siping
- China
| | - Dongduo Xu
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials
- Ministry of Education
- Jilin Normal University
- Siping
- China
| | - Weidong Ruan
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- China
| | - Lei Chen
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials
- Ministry of Education
- Jilin Normal University
- Siping
- China
| | - Limin Chang
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials
- Ministry of Education
- Jilin Normal University
- Siping
- China
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- China
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57
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Wang Y, Wang Y, Wang H, Cong M, Xu W, Xu S. Surface-enhanced Raman scattering on a hierarchical structural Ag nano-crown array in different detection ways. Phys Chem Chem Phys 2015; 17:1173-9. [DOI: 10.1039/c4cp04387a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hierarchical structural Ag nano-crown array SERS substrate that is more efficiently excited from the back side.
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Affiliation(s)
- Yi Wang
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
| | - Yuyang Wang
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
| | - Hailong Wang
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
| | - Ming Cong
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
| | - Weiqing Xu
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
| | - Shuping Xu
- State Key Laboratory of Supramolecular Structure and Materials
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People's Republic of China
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58
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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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59
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Iancu V, Baia L, Tarcea N, Popp J, Baia M. Towards TiO2Ag porous nanocomposites based SERS sensors for chemical pollutant detection. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.05.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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60
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Betz JF, Yu WW, Cheng Y, White IM, Rubloff GW. Simple SERS substrates: powerful, portable, and full of potential. Phys Chem Chem Phys 2014; 16:2224-39. [PMID: 24366393 DOI: 10.1039/c3cp53560f] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Surface enhanced Raman spectroscopy (SERS) is a powerful spectroscopic technique capable of detecting trace amounts of chemicals and identifying them based on their unique vibrational characteristics. While there are many complex methods for fabricating SERS substrates, there has been a recent shift towards the development of simple, low cost fabrication methods that can be performed in most labs or even in the field. The potential of SERS for widespread use will likely be realized only with development of cheaper, simpler methods. In this Perspective article we briefly review several of the more popular methods for SERS substrate fabrication, discuss the characteristics of simple SERS substrates, and examine several methods for producing simple SERS substrates. We highlight potential applications and future directions for simple SERS substrates, focusing on highly SERS active three-dimensional nanostructures fabricated by inkjet and screen printing and galvanic displacement for portable SERS analysis - an area that we believe has exciting potential for future research and commercialization.
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Affiliation(s)
- Jordan F Betz
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, USA
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61
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Ma RM, Ota S, Li Y, Yang S, Zhang X. Explosives detection in a lasing plasmon nanocavity. NATURE NANOTECHNOLOGY 2014; 9:600-4. [PMID: 25038780 DOI: 10.1038/nnano.2014.135] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 04/06/2014] [Indexed: 05/03/2023]
Abstract
Perhaps the most successful application of plasmonics to date has been in sensing, where the interaction of a nanoscale localized field with analytes leads to high-sensitivity detection in real time and in a label-free fashion. However, all previous designs have been based on passively excited surface plasmons, in which sensitivity is intrinsically limited by the low quality factors induced by metal losses. It has recently been proposed theoretically that surface plasmon sensors with active excitation (gain-enhanced) can achieve much higher sensitivities due to the amplification of the surface plasmons. Here, we experimentally demonstrate an active plasmon sensor that is free of metal losses and operating deep below the diffraction limit for visible light. Loss compensation leads to an intense and sharp lasing emission that is ultrasensitive to adsorbed molecules. We validated the efficacy of our sensor to detect explosives in air under normal conditions and have achieved a sub-part-per-billion detection limit, the lowest reported to date for plasmonic sensors with 2,4-dinitrotoluene and ammonium nitrate. The selectivity between 2,4-dinitrotoluene, ammonium nitrate and nitrobenzene is on a par with other state-of-the-art explosives detectors. Our results show that monitoring the change of the lasing intensity is a superior method than monitoring the wavelength shift, as is widely used in passive surface plasmon sensors. We therefore envisage that nanoscopic sensors that make use of plasmonic lasing could become an important tool in security screening and biomolecular diagnostics.
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Affiliation(s)
- Ren-Min Ma
- 1] NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA [2]
| | - Sadao Ota
- 1] NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA [2]
| | - Yimin Li
- NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA
| | - Sui Yang
- NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA
| | - Xiang Zhang
- 1] NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA [2] Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
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62
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Wang S, Liu C, Wang H, Chen G, Cong M, Song W, Jia Q, Xu S, Xu W. A surface-enhanced Raman scattering optrode prepared by in situ photoinduced reactions and its application for highly sensitive on-chip detection. ACS APPLIED MATERIALS & INTERFACES 2014; 6:11706-11713. [PMID: 24978908 DOI: 10.1021/am503881h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A surface-enhanced Raman scattering (SERS)-active optical fiber sensor combining the optical fiber waveguide with various SERS substrates has been a powerful analytical tool for in situ and long-distance SERS detection with high sensitivity. The design and modification of a high-quality SERS-active sensing layer are important topics in the development of novel SERS-active optical fiber sensors. Here, we prepared a highly sensitive SERS-active optrode by in situ fabrication of a three-dimensional porous structure on the optical fiber end via a photoinduced polymerization reaction, followed by the growth of photochemical silver nanoparticles above the porous polymer material. The fabrication process is rapid (finished within 1 h) and can be on line under light control. The porous structure supports vast silver nanoparticles, which allows for strong electromagnetic enhancement of SERS. Interestingly, the preparation of this SERS optrode and its utilization for SERS detection can all be conducted in a microfluidic chip. The qualitative and quantitative on-chip SERS sensing of organic pollutants and pesticides has been achieved by this SERS optrode-integrated microfluidic chip, and its high detection sensitivity makes it a promising factor in the analysis of liquid systems.
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Affiliation(s)
- Shaoyan Wang
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University , 2699 Qianjin Avenue, Changchun 130012, China
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63
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Buryakov IA, Buryakov TI, Matsaev VT. Optical chemical sensors for the detection of explosives and associated substances. JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1134/s1061934814070041] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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64
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Dasary SSR, Ray PC, Singh AK, Arbneshi T, Yu H, Senapati D. A surface enhanced Raman scattering probe for highly selective and ultra sensitive detection of iodide in water and salt samples. Analyst 2014; 138:1195-203. [PMID: 23295241 DOI: 10.1039/c2an36293g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Iodine is a biophilic and essential trace element for all life and especially for vertebrates, which require it to produce indispensable thyroid hormones in their thyroid glands. As a result, the adequate measurement of iodine in water and food samples is crucial to lead a healthy life. Motivated by its importance, this is the first time in the literature that the highly selective and ultra sensitive (30 ppt limit) surface enhanced Raman scattering (SERS)-based detection of iodide ions (I(-)) from environmental and food samples has been reported. The desired sensitivity and selectivity has been achieved by measuring the change in the SERS intensity originating from Rh6G-adsorbed 30 nm gold nanoparticles (GNPs) upon the addition of I(-). The strong chemical affinity offered by I(-) towards the gold surface results in extra negative charge being deposited on it. As a result, the GNP surface attracts a greater number of positively charged Rh6G molecules and induces a marked increase in the number of hot spots through aggregation, providing a significant enhancement of the Raman signal intensity. The oxidation of I(-) to molecular iodine (I(2)) by hydrogen peroxide (H(2)O(2)) is employed for the successful screening of the bromide ion (Br(-)) which shows substantial interference at higher concentrations.
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Affiliation(s)
- Samuel S R Dasary
- Department of Chemistry, Jackson State University, Jackson, MS 39217, USA
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65
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Wolosiuk A, Tognalli NG, Martínez ED, Granada M, Fuertes MC, Troiani H, Bilmes SA, Fainstein A, Soler-Illia GJAA. Silver nanoparticle-mesoporous oxide nanocomposite thin films: a platform for spatially homogeneous SERS-active substrates with enhanced stability. ACS APPLIED MATERIALS & INTERFACES 2014; 6:5263-5272. [PMID: 24621107 DOI: 10.1021/am500631f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We introduce a nanoparticle-mesoporous oxide thin film composite (NP-MOTF) as low-cost and straightforward sensing platforms for surface-enhanced Raman Spectroscopy (SERS). Titania, zirconia, and silica mesoporous matrices templated with Pluronics F-127 were synthesized via evaporation-induced self-assembly and loaded with homogeneously dispersed Ag nanoparticles by soft reduction or photoreduction. Both methods give rise to uniform and reproducible Raman signals using 4-mercaptopyridine as a probe molecule. Details on stability and reproducibility of the Raman enhancement are discussed. Extensions in the design of these composite structures were explored including detection of nonthiolated molecules, such as rhodamine 6-G or salicylic acid, patterning techniques for locating the enhancement regions and bilayered mesoporous structures to provide additional control on the environment, and potential size-selective filtration. These inorganic oxide-metal composites stand as extremely simple, reproducible, and versatile platforms for Raman spectroscopy analysis.
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Affiliation(s)
- Alejandro Wolosiuk
- Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica (CNEA) , Av. Gral Paz 1499 B1650KNA San Martín, Buenos Aires, Argentina
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66
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Schlücker S. Oberflächenverstärkte Raman-Spektroskopie: Konzepte und chemische Anwendungen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201205748] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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67
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Schlücker S. Surface-Enhanced Raman Spectroscopy: Concepts and Chemical Applications. Angew Chem Int Ed Engl 2014; 53:4756-95. [DOI: 10.1002/anie.201205748] [Citation(s) in RCA: 1634] [Impact Index Per Article: 163.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 11/03/2012] [Indexed: 01/10/2023]
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68
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Teoh HF, Dzung P, Lim WQ, Chua JH, Lee KK, Hu Z, Tan H, Tok ES, Sow CH. Microlandscaping on a graphene oxide film via localized decoration of Ag nanoparticles. NANOSCALE 2014; 6:3143-3149. [PMID: 24496439 DOI: 10.1039/c3nr05373c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A direct and facile method for micro-landscaping of Ag nanoparticles on reduced graphene oxide (rGO) is presented. This method employs a focused laser beam to achieve local reduction of Ag(+) ions to Ag NPs by laser irradiation on a GO film that is submerged in AgNO3 solution. Using this method, the Ag nanoparticles can be directly anchored on a rGO film, creating a microlandscape of Ag nanoparticles on the rGO film. In addition, varying the intensity of the laser beam can control the shapes, sizes and distributions of Ag nanoparticles. The resulting hybrid materials exhibit surface enhanced Raman scattering of up to 16 times depending on the size and number density of silver nanoparticles. In addition, the hybrid Ag-rGO material shows superior photoresponse when compared to rGO.
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Affiliation(s)
- Hao Fatt Teoh
- Graduate School of Integrative Sciences and Engineering, National University of Singapore, 28 Medical Drive, Singapore 117456.
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69
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Oh YJ, Jeong KH. Optofluidic SERS chip with plasmonic nanoprobes self-aligned along microfluidic channels. LAB ON A CHIP 2014; 14:865-8. [PMID: 24452813 DOI: 10.1039/c3lc51257f] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This work reports an optofluidic SERS chip with plasmonic nanoprobes self-aligned along microfluidic channels. Plasmonic nanoprobes with rich electromagnetic hot spots are selectively patterned along PDMS microfluidic channels by using a Scotch tape removal and oxygen plasma treatment, which also provide the permanent bonding between PDMS and a glass substrate. A silver film with an initial thickness of 30 nm after oxygen plasma treatment creates nanotips and nanodots with a maximum SERS performance, which were successfully implanted with microfluidic concentration gradient generators. The novel device enables the label-free and solution-phase SERS detection of small molecules with low Raman activity such as dopamine at micromolar level in flow. This optofluidic SERS chip can be readily expanded for microfluidic networks with diverse functions for advanced optical biochemical assays.
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Affiliation(s)
- Young-Jae Oh
- Department of Bio and Brain Engineering, KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
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70
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Sharma Y, Dhawan A. Hybrid nanoparticle-nanoline plasmonic cavities as SERS substrates with gap-controlled enhancements and resonances. NANOTECHNOLOGY 2014; 25:085202. [PMID: 24492249 DOI: 10.1088/0957-4484/25/8/085202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present hybrid nanoline-nanoparticle plasmonic substrates which allow easily achievable sub-5 nm gaps and a possibility of large-area fabrication. These substrates--based on plasmonic nanocavities formed by arrays of plasmonic nanoparticle (NP) dimers lying inside periodic metal nanolines (NLs)--can be used as tunable surface enhanced Raman scattering (SERS) substrates due to the tunability of cavity modes in the gap regions. Theoretical studies were conducted, using finite difference time domain (FDTD) modeling, to understand the plasmon resonance tunability as a function of gaps in these hybrid plasmonic substrates. The gaps forming the nanocavities include those between nanolines and nanoparticles (NL-NP) and between two nanoparticles (NP-NP). Our analysis reveals that these gaps play a combined role in tuning the resonance wavelength and the magnitude of electromagnetic field enhancement. Moreover, distinct structure-dependent plasmon resonance peaks are present in addition to material-dependent resonance peaks characteristic to the metal involved. Replacing the spherical particle arrays inside the nanolines with nanorod arrays revealed the possibility of tuning the plasmon resonance in the near-infrared regime. This indicates that there is a possibility of tuning the plasmon resonance wavelength to any region of the visible or near-infrared spectrum by changing the size or shape of the particles assembled inside these plasmonic nanolines.
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Affiliation(s)
- Yashna Sharma
- Department of Electrical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi-110016, India
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71
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Abstract
Tip-enhanced near-field optical microscopy (TENOM) is a scanning probe technique capable of providing a broad range of spectroscopic information on single objects and structured surfaces at nanometer spatial resolution and with highest detection sensitivity. In this review, we first illustrate the physical principle of TENOM that utilizes the antenna function of a sharp probe to efficiently couple light to excitations on nanometer length scales. We then discuss the antenna-induced enhancement of different optical sample responses including Raman scattering, fluorescence, generation of photocurrent and electroluminescence. Different experimental realizations are presented and several recent examples that demonstrate the capabilities of the technique are reviewed.
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Affiliation(s)
- Nina Mauser
- Department Chemie & CeNS, LMU München, 81377 München, Germany.
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72
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Additional enhancement of electric field in surface-enhanced Raman Scattering due to Fresnel mechanism. Sci Rep 2014; 3:2335. [PMID: 23903714 PMCID: PMC3730165 DOI: 10.1038/srep02335] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 07/10/2013] [Indexed: 12/05/2022] Open
Abstract
Surface-enhanced Raman scattering (SERS) is attracting increasing interest for chemical sensing, surface science research and as an intriguing challenge in nanoscale plasmonic engineering. Several studies have shown that SERS intensities are increased when metal island film substrates are excited through a transparent base material, rather than directly through air. However, to our knowledge, the origin of this additional enhancement has never been satisfactorily explained. In this paper, finite difference time domain modeling is presented to show that the electric field intensity at the dielectric interface between metal particles is higher for “far-side” excitation than “near-side”. This is reasonably consistent with the observed enhancement for silver islands on SiO2. The modeling results are supported by a simple analytical model based on Fresnel reflection at the interface, which suggests that the additional SERS signal is caused by near-field enhancement of the electric field due to the phase shift at the dielectric interface.
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73
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SERS-Active Ag Decorated Polymer Nanorod Substrate Fabricated by the Combination of Photochemical Reduction and Nanoimprint Technology. ACTA ACUST UNITED AC 2014. [DOI: 10.4028/www.scientific.net/amr.886.101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrated a cost-effective and simple method of fabricating Ag-decorated polymer nanorod (ADPN) array by the combination of fabricated by the combination of photochemical reduction and nanoimprint technology. Here, nanoimprint lithography is utilized to fabricate polymer nanorod array as the periodic temple. Subsequently, ADPNs array can be achieved via UV irradiating. The as-synthesized ADPNs array exhibited a remarkable SERS activity and Raman signal reproducibility to rhodamine 6G, a concentration down to 1011 M can be identified. Our results revealed that the ADPN array is a highly desirable candidate as the reliable enhancer for high performance SERS analysis.
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74
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Farrell ME, Holthoff EL, Pellegrino PM. Surface-enhanced Raman scattering detection of ammonium nitrate samples fabricated using drop-on-demand inkjet technology. APPLIED SPECTROSCOPY 2014; 68:287-296. [PMID: 24666945 DOI: 10.1366/13-07035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The United States Army and the first responder community are increasingly focusing efforts on energetic materials detection and identification. Main hazards encountered in theater include homemade explosives and improvised explosive devices, in part fabricated from simple components like ammonium nitrate (AN). In order to accurately detect and identify these unknowns (energetic or benign), fielded detection systems must be accurately trained using well-understood universal testing substrates. These training substrates must contain target species at known concentrations and recognized polymorphic phases. Ammonium nitrate is an explosive precursor material that demonstrates several different polymorphic phases dependent upon how the material is deposited onto testing substrates. In this paper, known concentrations of AN were uniformly deposited onto commercially available surface-enhanced Raman scattering (SERS) substrates using a drop-on-demand inkjet printing system. The phase changes observed after the deposition of AN under several solvent conditions are investigated. Characteristics of the collected SERS spectra of AN are discussed, and it is demonstrated that an understanding of the exact nature of the AN samples deposited will result in an increased ability to accurately and reliably "train" hazard detection systems.
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Affiliation(s)
- Mikella E Farrell
- U.S. Army Research Laboratory, RDRL-SEE-E, 2800 Powder Mill Rd., Adelphi, MD 20783 USA
| | - Ellen L Holthoff
- U.S. Army Research Laboratory, RDRL-SEE-E, 2800 Powder Mill Rd., Adelphi, MD 20783 USA
| | - Paul M Pellegrino
- U.S. Army Research Laboratory, RDRL-SEE-E, 2800 Powder Mill Rd., Adelphi, MD 20783 USA
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75
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Golsheikh AM, Huang NM, Lim HN, Zakaria R. One-pot sonochemical synthesis of reduced graphene oxide uniformly decorated with ultrafine silver nanoparticles for non-enzymatic detection of H2O2 and optical detection of mercury ions. RSC Adv 2014. [DOI: 10.1039/c4ra05998k] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The ultrasonic irradiation of an aqueous solution containing a silver ammonia complex (Ag(NH3)2OH) and graphene oxide (GO) is a simple strategy for producing GO uniformly decorated with ultrafine AgNPs.
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Affiliation(s)
- A. Moradi Golsheikh
- Low Dimensional Materials Research Centre (LDMRC)
- Physics Department
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
| | - N. M. Huang
- Low Dimensional Materials Research Centre (LDMRC)
- Physics Department
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
| | - H. N. Lim
- Department of Chemistry
- Faculty of Science
- University Putra Malaysia
- 43400 UPM Serdang, Malaysia
| | - Rozalina Zakaria
- Photonics Research Centre
- Physics Department
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
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76
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Ota S, Wang S, Ryu J, Wang Y, Chen Y, Zhang X. Intracellular delivery of top-down fabricated tunable nano-plasmonic resonators. NANOSCALE 2013; 5:10179-10182. [PMID: 24056760 DOI: 10.1039/c3nr02910g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Engineered plasmonic structures fabricated using top-down technologies have demonstrated huge enhancements in the optical response of molecules, including Raman scattering. However, providing a sufficient number of such top-down fabricated nanostructures in solution has been a nontrivial task which has limited their potential in intracellular applications. Here we report the development of a protocol for the intracellular delivery of tunable nanoplasmonic resonators fabricated via scalable top-down techniques. This offers excellent possibilities towards the real-time parallel optical detection of intracellular molecular events.
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Affiliation(s)
- Sadao Ota
- Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
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77
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Polavarapu L, Liz-Marzán LM. Towards low-cost flexible substrates for nanoplasmonic sensing. Phys Chem Chem Phys 2013; 15:5288-300. [PMID: 23303134 DOI: 10.1039/c2cp43642f] [Citation(s) in RCA: 214] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Plasmonic nanostructures have played a significant role in the field of nanotechnology due to their unprecedented ability to concentrate light at the nanometre scale, which renders them precious for various sensing applications. The adsorption of plasmonic nanoparticles and nanostructures onto solid substrates in a controlled manner is a crucial process for the fabrication of nanoplasmonic devices, in which the nanoparticles amplify the electromagnetic fields for enhanced device performance. In this perspective article we summarize recent developments in the fabrication of flexible nanoplasmonic devices for sensing applications based on surface enhanced Raman scattering (SERS) and localized surface plasmon resonance (LSPR) shifts. We introduce different types of flexible substrates such as filter paper, free-standing nanofibres, elastomers, plastics, carbon nanotubes and graphene, for the fabrication of low-cost flexible nanoplasmonic devices. Various techniques are described that allow impregnation of such flexible substrates with plasmonic nanoparticles, including solution processes, physical vapour deposition and lithographic techniques. From the discussion in this Perspective, it is clear that highly sensitive and reproducible flexible plasmonic devices can currently be fabricated on a large scale at relatively low-cost, toward real-world applications in diagnostics and detection.
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78
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Concentration dependent conformation of inosine on colloidal silver nanoparticles: A study by Raman, SERS and DFT calculation. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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79
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Analysis of protein acetyltransferase structure-function relation by surface-enhanced raman scattering (SERS): a tool to screen and characterize small molecule modulators. Methods Mol Biol 2013; 981:239-61. [PMID: 23381867 DOI: 10.1007/978-1-62703-305-3_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Among the different posttranslational modifications (PTMs) that significantly regulate the protein function, lysine acetylation has become the major focus, especially to understand the epigenetic role of the acetyltransferases, in cellular physiology. Furthermore, dysfunction of these acetyltransferases is well documented under pathophysiological conditions. Therefore, it is important to understand the dynamic structure-function relationship of acetyltransferases in a relatively less complicated and faster method, which could be efficiently exploited to design and synthesis of small molecule modulators (activators/inhibitors) of these enzymes for in vivo functional analysis and therapeutic purposes. We have developed surface-enhanced Raman scattering (SERS) method, for acetyltransferases towards this goal. By employing SERS, we have not only demonstrated the autoacetylation induced structural changes of p300 enzyme but also could use this technique to characterize and design potent, specific inhibitors as well as activators of the p300. In this chapter we shall describe the methods in detail which could be highly useful for other classes of HATs and PTM enzymes.
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80
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Li Y, Ma Z. Facile fabrication of truncated octahedral Au nanoparticles and its application for ultrasensitive surface enhanced Raman scattering immunosensing. NANOTECHNOLOGY 2013; 24:275605. [PMID: 23764655 DOI: 10.1088/0957-4484/24/27/275605] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Monodispersed truncated octahedral (TOH) Au nanoparticles (NPs) with an average edge-length of about 16 nm were synthesized using poly(diallyldimethylammonium chloride) (PDDA) both as a stabilizing and reducing agent via a one-step reaction. Remarkably, no seeds, surfactants or additional reductant were used in this reaction. In addition, the PDDA molecules on the surface of the TOH AuNPs make them convenient for use in layer-by-layer assembly by electrostatic interactions. Importantly, the TOH AuNPs show a significant surface enhanced Raman scattering (SERS) activity, and can be directly used for building SERS-active substrates and tags. Based on these promising properties, an ultrasensitive SERS-based immunosensing platform was developed. Using human immunoglobulin (h-IgG) as a model target analyte, a detection limit of 36.56 fg ml(-1) was reached.
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Affiliation(s)
- Yanxiao Li
- Department of Chemistry, Capital Normal University, Beijing 100048, People's Republic of China
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81
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Xu SC, Zhang YX, Luo YY, Wang S, Ding HL, Xu JM, Li GH. Ag-decorated TiO₂ nanograss for 3D SERS-active substrate with visible light self-cleaning and reactivation. Analyst 2013; 138:4519-25. [PMID: 23774192 DOI: 10.1039/c3an00750b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The production of SERS-active substrates which are uniform, sensitive, reproducibile and durable still remains an important issue. Here, we report a strategy for the fabrication of a large-area Ag-decorated TiO₂ nanograss SERS-active substrate by a simple solvothermal approach combined with Ag evaporation. The nanograss consists of dense rutile TiO₂ nanorods of about 5 nm in diameter and the decorated Ag nanoparticles are an average of 8 nm in diameter. The Ag protrusions and gaps between them contribute to three dimensional SERS "hot spots" which can be modulated by simply controlling the Ag evaporating parameters. The Ag-decorated TiO₂ substrate is highly efficient in detecting rhodamine 6G (R6G) and 4-aminothiophenol (4-ATP) molecules and has good homogeneity. An obvious red shift and even high enhancement of b₂ vibration mode were observed in detecting 4-ATP due to the effective charge transfer from the Ag atoms to sulfur atoms. The Ag-decorated TiO₂ substrate can be easily self-cleaned and reactivated by visible light irradiation without obvious degeneration of SERS signals. Our results demonstrate that the Ag-decorated TiO₂ substrate with high and homogeneous SERS activity has potential feasibility as a sensitive SERS probe.
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Affiliation(s)
- S C Xu
- Key Laboratory of Materials Physics, Anhui Key Lab of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China.
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82
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Yuan H, Register JK, Wang HN, Fales AM, Liu Y, Vo-Dinh T. Plasmonic nanoprobes for intracellular sensing and imaging. Anal Bioanal Chem 2013; 405:6165-80. [DOI: 10.1007/s00216-013-6975-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 04/03/2013] [Accepted: 04/04/2013] [Indexed: 01/08/2023]
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83
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He P, Zhang Y, Liu L, Qiao W, Zhang S. Ultrasensitive SERS Detection of Lysozyme by a Target-Triggering Multiple Cycle Amplification Strategy Based on a Gold Substrate. Chemistry 2013; 19:7452-60. [DOI: 10.1002/chem.201203224] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 03/01/2013] [Indexed: 01/14/2023]
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84
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Cabrera FC, Agostini DLS, dos Santos RJ, Teixeira SR, Rodríguez-Pérez MA, Job AE. Characterization of natural rubber/gold nanoparticles SERS-active substrate. J Appl Polym Sci 2013. [DOI: 10.1002/app.39153] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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85
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Yuan H, Fales AM, Khoury CG, Liu J, Vo-Dinh T. Spectral Characterization and Intracellular Detection of Surface-Enhanced Raman Scattering (SERS)-Encoded Plasmonic Gold Nanostars. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2013; 44:234-239. [PMID: 24839346 PMCID: PMC4022294 DOI: 10.1002/jrs.4172] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Plasmonic gold nanostars offer a new platform for Surface-Enhanced Raman Scattering (SERS). However, due to the presence of organic surfactant on the nanoparticles, SERS characterization and application of nanostar ensembles in solution have been challenging. Here we applied our newly developed surfactant-free nanostars for SERS characterization and application. The SERS enhancement factors (EF) of silver spheres, gold spheres and nanostars of similar sizes and concentration were compared. Under 785 nm excitation, nanostars and silver spheres have similar EF, and both are much stronger than gold spheres. Having plasmon matching the incident energy and multiple "hot spots" on the branches bring forth strong SERS response without the need to aggregate. Intracellular detection of silica-coated SERS-encoded nanostars was also demonstrated in breast cancer cells. The non-aggregated field enhancement makes the gold nanostar ensemble a promising agent for SERS bioapplications.
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Affiliation(s)
- Hsiangkuo Yuan
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA
| | - Andrew M. Fales
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA
| | - Christopher G. Khoury
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA
| | - Jesse Liu
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Tuan Vo-Dinh
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA
- Department of Chemistry, Duke University, Durham, NC 27708, USA
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86
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Yu WW, White IM. Chromatographic separation and detection of target analytes from complex samples using inkjet printed SERS substrates. Analyst 2013; 138:3679-86. [DOI: 10.1039/c3an00673e] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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87
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Dou X, Chung PY, Sha H, Lin YC, Jiang P. Large-scale fabrication of nanodimple arrays for surface-enhanced Raman scattering. Phys Chem Chem Phys 2013; 15:12680-7. [DOI: 10.1039/c3cp50714a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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88
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Gu X, Tian S, Zhou Q, Adkins J, Gu Z, Li X, Zheng J. SERS detection of polycyclic aromatic hydrocarbons on a bowl-shaped silver cavity substrate. RSC Adv 2013. [DOI: 10.1039/c3ra43442g] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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89
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Bhatnagar K, Pathak A, Menke D, Cornish PV, Gangopadhyay K, Korampally V, Gangopadhyay S. Fluorescence enhancement from nano-gap embedded plasmonic gratings by a novel fabrication technique with HD-DVD. NANOTECHNOLOGY 2012; 23:495201. [PMID: 23154752 DOI: 10.1088/0957-4484/23/49/495201] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We demonstrate strong electromagnetic field enhancement from nano-gaps embedded in silver gratings for visible wavelengths. These structures fabricated using a store-bought HD-DVD worth $10 and conventional micro-contact printing techniques have shown maximum fluorescence enhancement factors of up to 118 times when compared to a glass substrate under epi-fluorescent conditions. The novel fabrication procedure provides for the development of a cost-effective and facile plasmonic substrate for low-level chemical and biological detection. Electromagnetic field simulations were also performed that reveal the strong field confinement in the nano-gap region embedded in the silver grating, which is attributed to the combined effect of localized as well as propagating surface plasmons.
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Affiliation(s)
- K Bhatnagar
- Department of Electrical and Computer Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA
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90
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Goldberg-Oppenheimer P, Hutter T, Chen B, Robertson J, Hofmann S, Mahajan S. Optimized Vertical Carbon Nanotube Forests for Multiplex Surface-Enhanced Raman Scattering Detection. J Phys Chem Lett 2012; 3:3486-92. [PMID: 26290977 DOI: 10.1021/jz301333r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The highly sensitive and molecule-specific technique of surface-enhanced Raman spectroscopy (SERS) generates high signal enhancements via localized optical fields on nanoscale metallic materials, which can be tuned by manipulation of the surface roughness and architecture on the submicrometer level. We investigate gold-functionalized vertically aligned carbon nanotube forests (VACNTs) as low-cost straightforward SERS nanoplatforms. We find that their SERS enhancements depend on their diameter and density, which are systematically optimized for their performance. Modeling of the VACNT-based SERS substrates confirms consistent dependence on structural parameters as observed experimentally. The created nanostructures span over large substrate areas, are readily configurable, and yield uniform and reproducible SERS enhancement factors. Further fabricated micropatterned VACNTs platforms are shown to deliver multiplexed SERS detection. The unique properties of CNTs, which can be synergistically utilized in VACNT-based substrates and patterned arrays, can thus provide new generation platforms for SERS detection.
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Affiliation(s)
| | - Tanya Hutter
- ‡Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Bingan Chen
- †Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - John Robertson
- †Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - Stephan Hofmann
- †Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - Sumeet Mahajan
- §Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB30HE, United Kingdom
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91
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Tan E, Yin P, Lang X, Zhang H, Guo L. A novel surface-enhanced Raman scattering nanosensor for detecting multiple heavy metal ions based on 2-mercaptoisonicotinic acid functionalized gold nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:1007-1012. [PMID: 22925976 DOI: 10.1016/j.saa.2012.07.114] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 06/28/2012] [Accepted: 07/26/2012] [Indexed: 06/01/2023]
Abstract
A novel, effective and simple surface-enhanced Raman scattering (SERS) nanosensor for selectively and sensitively detecting heavy metal ions in aqueous solution has been developed in the form of 2-mercaptoisonicotinic acid (2 MNA)-modified gold nanoparticles (AuNPs). Multiple heavy metal ions can be identified and quantified by using relative peak intensity ratios of selected vibrational bands in the SERS spectra of 2 MNA. Especially, concentration of Hg(2+) and Pb(2+) ions are determined by comparing the intensity ratios of the bands 1160/1230 cm(-1) for Hg(2+) and 861/815 cm(-1) (or 815/1392 cm(-1)) for Pb(2+), with detection limits of 3.4×10(-8) and 1.0×10(-7)M, respectively. 2 MNA-AuNPs sensors show a high selectivity for Hg(2+) without masking reagent, and they can also be highly selective for Pb(2+) when using sodium thiosulphate and l-cysteine as masking reagents. These results demonstrate that these 2 MNA-AuNPs nanosensors are promising candidates for in situ heavy metal ions detection and quantification, maybe even inside living cells.
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Affiliation(s)
- Enzhong Tan
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
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92
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Jin Y. Engineering plasmonic gold nanostructures and metamaterials for biosensing and nanomedicine. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5153-65. [PMID: 22760939 DOI: 10.1002/adma.201200622] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Indexed: 05/10/2023]
Abstract
The fields of biosensing and nanomedicine have recently witnessed an explosion of interest and progress in the design and study of plasmonic Au nanostructures (p-AuNSs) or metamaterials geared towards a broad range of biological and biomedical applications. Due to their tunable and versatile plasmonic properties, such artificially engineered p-AuNSs and materials have the potential to push biosensor sensitivity towards the single-molecule detection limit, enabling new bioimaging modalities and new analytical techniques and tools capable of single-molecule detection, analysis and manipulation, and to revolutionize the diagnosis and treatment of many diseases, including cancers. This report summarizes and highlights recent major advances in the emerging field of bioapplication-oriented engineering of p-AuNSs and hybrids, focusing on design considerations and ways to carry them out. A brief overview of the optical properties of p-AuNSs is introduced, and then the importance of plasmonic engineering and future promising research directions and challenges in the field are discussed.
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Affiliation(s)
- Yongdong Jin
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, PR China.
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93
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Kim KH, Baek YK, Jeon HJ, Srinivasarao M, Jung HT. Cylindrical posts of Ag/SiO₂/Au multi-segment layer patterns for highly efficient surface enhanced Raman scattering. NANOTECHNOLOGY 2012; 23:315302. [PMID: 22802161 DOI: 10.1088/0957-4484/23/31/315302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We fabricated a regular array of Ag/SiO₂/Au multi-segment cylindrical nanopatterns to create a highly efficient surface enhanced Raman scattering (SERS) active substrate using an advanced soft-nanoimprint lithographic technique. The SERS spectra results for Rhodamine 6G (R6G) molecules on the Ag/SiO₂/Au multi-segment nanopatterns show that the highly ordered patterns and interlayer thickness are responsible for enhancing the sensitivity and reproducibility, respectively, The multi-segment nanopattern with a silica interlayer generates significant SERS enhancement (~EF = 1.2 x 10⁶) as compared to that of the bimetallic (Ag/Au) nanopatterns without a dielectric gap (~EF = 1.0 x 10⁴). Further precise control of the interlayer distances between the two metals plays an essential role in enhancing SERS performance for detecting low concentrations of analytes such as fluorescent (Rhodamine 6G) and DNA molecules. Therefore, the highly ordered multi-segment patterns provide great sensitivity and reproducibility of SERS based detection, resulting in a high performance of the SERS substrate.
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Affiliation(s)
- Kyoung Hwan Kim
- National Research Laboratory for Organic Opto-electronic Materials, Department of Chemical and Biomolecular Engineering-BK-21, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
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94
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Lamsal R, Harroun SG, Brosseau CL, Gagnon GA. Use of surface enhanced Raman spectroscopy for studying fouling on nanofiltration membrane. Sep Purif Technol 2012. [DOI: 10.1016/j.seppur.2012.05.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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95
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Abbott SB, Daly KR, D'Alessandro G, Kaczmarek M, Smith DC. Photorefractive control of surface plasmon polaritons in a hybrid liquid crystal cell. OPTICS LETTERS 2012; 37:2436-2438. [PMID: 22743413 DOI: 10.1364/ol.37.002436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a photorefractive hybrid liquid crystal system that allows strong photorefractive effects on surface plasmon polaritons. We demonstrate its capability to couple energy between two 1.03 eV surface plasmon polariton modes with an efficiency of 25.3±2.3%. We present the energy and grating pitch dependence of the diffraction and a model that can qualitatively explain them.
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Affiliation(s)
- Stephen B Abbott
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
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96
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Zhou Y, Chen J, Zhang L, Yang L. Multifunctional TiO2-Coated Ag Nanowire Arrays as Recyclable SERS Substrates for the Detection of Organic Pollutants. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200009] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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97
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Oh YJ, Jeong KH. Glass nanopillar arrays with nanogap-rich silver nanoislands for highly intense surface enhanced Raman scattering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:2234-2237. [PMID: 22454295 DOI: 10.1002/adma.201104696] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 01/25/2012] [Indexed: 05/31/2023]
Abstract
The enhancement of surface enhanced Raman scattering (SERS) with nanogap-rich silver nanoislands surrounding glass nanopillars at wafer level is reported. High-density hot spots are generated by increasing the number of nanogap-rich nanoislands within a detection volume. The SERS substrate shows a high enhancement factor of over 10(7) with excellent signal uniformity (∼7.8%) and it enables the label-free detection of aqueous DNA base molecules at nanomolar level.
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Affiliation(s)
- Young-Jae Oh
- Department of Bio and Brain Engineering, KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, Korea
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98
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Khaing Oo MK, Guo Y, Reddy K, Liu J, Fan X. Ultrasensitive Vapor Detection with Surface-Enhanced Raman Scattering-Active Gold Nanoparticle Immobilized Flow-Through Multihole Capillaries. Anal Chem 2012; 84:3376-81. [DOI: 10.1021/ac300175v] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maung Kyaw Khaing Oo
- Department of Biomedical
Engineering and ‡Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Yunbo Guo
- Department of Biomedical
Engineering and ‡Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Karthik Reddy
- Department of Biomedical
Engineering and ‡Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Jing Liu
- Department of Biomedical
Engineering and ‡Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Xudong Fan
- Department of Biomedical
Engineering and ‡Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan
48109, United States
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Přikryl J, Klepárník K, Foret F. Photodeposited silver nanoparticles for on-column surface-enhanced Raman spectrometry detection in capillary electrophoresis. J Chromatogr A 2012; 1226:43-7. [DOI: 10.1016/j.chroma.2011.07.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/14/2011] [Accepted: 07/15/2011] [Indexed: 11/28/2022]
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry, University of California, Riverside, California 92521, United States
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