101
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Tan E, Yin P, Lang X, Wang X, You T, Guo L. Functionalized gold nanoparticles as nanosensor for sensitive and selective detection of silver ions and silver nanoparticles by surface-enhanced Raman scattering. Analyst 2012; 137:3925-8. [PMID: 22745933 DOI: 10.1039/c2an35670h] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed a surface-enhanced Raman scattering (SERS) nanosensor firstly for Ag ions and Ag nanoparticles detection based on 2-mercaptoisonicotinic acid (2MNA)-functionalized Au nanoparticles. Ag(+) can coordinate with 2MNA resutling in a variation of its SERS spectrum, which is used as a criterion to determine Ag(+) in a solution. This sensor exhibits a detection limit no more than 25 nM and has a high selectivity against other metal ions. More importantly, it can be directly applied in real sample detection.
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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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102
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Shan G, Zheng S, Chen S, Chen Y, Liu Y. Multifunctional ZnO/Ag nanorod array as highly sensitive substrate for surface enhanced Raman detection. Colloids Surf B Biointerfaces 2012; 94:157-62. [DOI: 10.1016/j.colsurfb.2012.01.037] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 12/25/2011] [Accepted: 01/23/2012] [Indexed: 10/14/2022]
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103
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Li X, Hu H, Li D, Shen Z, Xiong Q, Li S, Fan HJ. Ordered array of gold semishells on TiO2 spheres: an ultrasensitive and recyclable SERS substrate. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2180-5. [PMID: 22471731 DOI: 10.1021/am300189n] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Ordered array of Au semishells on TiO(2) spheres with controlled size are prepared by combining the nanosphere self-assembly and atomic layer deposition (ALD). This ordered 2-D structure with designed array of metal nanogaps can be used as an ultrasensitive surface-enhanced Raman scattering (SERS) substrate with high reproducibility and stability. More importantly, the SERS substrates are recyclable, as enabled by their self-cleaning function due to the TiO(2) photocatalytic degradation of the target molecules. The high SERS sensitivity and recyclability are demonstrated by the detection of Rhodamine 6G (R6G) and brilliant cresyl blue (BCB) molecules. As both the nanosphere lithography and ALD are scalable processes, such 2-D ordered substrates may find applications in chemical sensing.
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Affiliation(s)
- Xianglin Li
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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104
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Zhu Z, Liu W, Li Z, Han B, Zhou Y, Gao Y, Tang Z. Manipulation of collective optical activity in one-dimensional plasmonic assembly. ACS NANO 2012; 6:2326-2332. [PMID: 22324310 DOI: 10.1021/nn2044802] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The manipulation of the chirality and corresponding optical activity in the visible-near-infrared (NIR) light region is significant to realize applications in the fields of chemical sensing, enantioselective separation, chiral nanocatalysis, and optical devices. We studied the plasmon-induced circular dichroism (CD) response by one-dimensional (1D) assembly of cysteine (CYS) and gold nanorods (GNRs). Typically, GNRs can form end-to-end assembly through the electrostatic attraction of CYS molecules preferentially attached on the ends of different GNRs. CD responses are observed at both the UV and visible-NIR light region in the 1D assembly, which are assigned to the CYS molecules and the GNRs, respectively. In addition, the wavelength of the CD responses can be manipulated from 550 nm to more than 900 nm through altering the aspect ratios of GNRs in 1D assembly. Anisotropic enhancement of optical activity is discovered, suggesting that the enhancement of the longitudinal localized surface plasmon resonance (LSPR) peak of GNRs in the CD response is much more apparent than that of the transverse LSPR. The CD responses of individual CYS-attached GNRs and CYS-assembled gold nanoparticles (GNPs) substantiate that the form of assembly and the shape of building blocks are significant not only for the intensity but for the line shape of the CD signals.
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Affiliation(s)
- Zhening Zhu
- Laboratory of Nanomaterials, National Center for Nanoscience and Technology, Beijing, People's Republic of China
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105
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Qiu C, Zhang L, Wang H, Jiang C. Surface-Enhanced Raman Scattering on Hierarchical Porous Cuprous Oxide Nanostructures in Nanoshell and Thin-Film Geometries. J Phys Chem Lett 2012; 3:651-657. [PMID: 26286162 DOI: 10.1021/jz201694s] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Understanding the mechanism of surface-enhanced Raman scattering (SERS) of molecules on semiconductor nanostructures is directly related to our capabilities of designing and optimizing new SERS-active substrates for broad applications in the field of molecular detection and characterization. Here, we present an exploration of using cuprous oxide nanostructures with hierarchical porosity for enhancing Raman signals of adsorbed probe molecules. Distinct SERS signals were detected on both individual polycrystalline nanoshells and porous thin films composed of cuprous oxide nanocrystals. The observed enhancement of SERS signals can be interpreted as synergistic effects of strong chemical interactions between the probe molecules and cuprous oxide surfaces, localized electromagnetic field enhancement, and the unique hierarchical porosity of the nanostructures. Our work introduced a novel type of semiconductor substrates for high-performance SERS and extended the applications of cuprous oxide nanostructures to spectroscopy-based molecular sensing and characterizations.
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Affiliation(s)
- Chao Qiu
- †Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
| | - Li Zhang
- ‡Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Hui Wang
- ‡Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Chaoyang Jiang
- †Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
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106
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Jiao J, Wang X, Wackenhut F, Horneber A, Chen L, Failla AV, Meixner AJ, Zhang D. Polarization-Dependent SERS at Differently Oriented Single Gold Nanorods. Chemphyschem 2012; 13:952-8. [DOI: 10.1002/cphc.201100718] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 01/27/2012] [Indexed: 11/08/2022]
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107
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Dostert KH, Álvarez M, Koynov K, del Campo A, Butt HJ, Kreiter M. Near field guided chemical nanopatterning. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3699-3703. [PMID: 22316359 DOI: 10.1021/la300009a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This article demonstrates the possibility of creating well-defined and functional surface chemical nanopatterns using the optical near field of metal nanostructures and a photosensitive organic layer. The intensity distribution of the near field controlled the site and the extent of the photochemical reaction at the surface. The resulting pattern was used to guide the controlled assembly of colloids with a complementary surface functionality onto the substrate. Gold colloids of 20 nm diameter were covalently bound to the activated nanosites and proved the functionality of the suboptical wavelength structures and enabled direct visualization by means of electron microscopy. Our results prove, for the first time, the possibility of using optical near field to perform chemical reactions and assembly at the nanoscale.
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Affiliation(s)
- Karl-Heinz Dostert
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
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108
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Potara M, Baia M, Farcau C, Astilean S. Chitosan-coated anisotropic silver nanoparticles as a SERS substrate for single-molecule detection. NANOTECHNOLOGY 2012; 23:055501. [PMID: 22236478 DOI: 10.1088/0957-4484/23/5/055501] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a technique that has become widely used for identifying and providing structural information about molecular species in low concentration. There is an ongoing interest in finding optimum particle size, shape and spatial distribution for optimizing the SERS substrates and pushing the sensitivity toward the single-molecule detection limit. This work reports the design of a novel, biocompatible SERS substrate based on small clusters of anisotropic silver nanoparticles embedded in a film of chitosan biopolymer. The SERS efficiency of the biocompatible film is assessed by employing Raman imaging and spectroscopy of adenine, a significant biological molecule. By combining atomic force microscopy with SERS imaging we find that the chitosan matrix enables the formation of small clusters of silver nanoparticles, with junctions and gaps that greatly enhance the Raman intensities of the adsorbed molecules. The study demonstrates that chitosan-coated anisotropic silver nanoparticle clusters are sensitive enough to be implemented as effective plasmonic substrates for SERS detection of nonresonant analytes at the single-molecule level.
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Affiliation(s)
- Monica Potara
- Nanobiophotonics and Laser Microscopy Center, Interdisciplinary Research in Bio-Nano-Sciences, and Faculty of Physics, Babes-Bolyai University, Treboniu Laurian Street 42, 400271 Cluj-Napoca, Romania
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109
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Nagaoka Y, Chen O, Wang Z, Cao YC. Structural Control of Nanocrystal Superlattices Using Organic Guest Molecules. J Am Chem Soc 2012; 134:2868-71. [DOI: 10.1021/ja209062d] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasutaka Nagaoka
- Department of Chemistry, University of Florida, Gainesville, Florida 32611,
United States
| | - Ou Chen
- Department of Chemistry, University of Florida, Gainesville, Florida 32611,
United States
| | - Zhongwu Wang
- Cornell High
Energy Synchrotron
Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Y. Charles Cao
- Department of Chemistry, University of Florida, Gainesville, Florida 32611,
United States
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110
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Xu L, Kuang H, Xu C, Ma W, Wang L, Kotov NA. Regiospecific plasmonic assemblies for in situ Raman spectroscopy in live cells. J Am Chem Soc 2012; 134:1699-709. [PMID: 22192084 PMCID: PMC3277787 DOI: 10.1021/ja2088713] [Citation(s) in RCA: 197] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Multiple properties of plasmonic assemblies are determined by their geometrical organization. While high degree of complexity was achieved for plasmonic superstructures based on nanoparticles (NPs), little is known about the stable and structurally reproducible plasmonic assemblies made up from geometrically diverse plasmonic building blocks. Among other possibilities, they open the door for the preparation of regiospecific isomers of nanoscale assemblies significant both from a fundamental point of view and optical applications. Here, we present a synthetic method for complex assemblies from NPs and nanorods (NRs) based on selective modification of NRs with DNA oligomers. Three types of assemblies denoted as End, Side, and Satellite isomers that display distinct elements of regiospecificity were prepared with the yield exceeding 85%. Multiple experimental methods independently verify various structural features, uniformity, and stability of the prepared assemblies. The presence of interparticle gaps with finely controlled geometrical parameters and inherently small size comparable with those of cellular organelles fomented their study as intracellular probes. Against initial expectations, SERS intensity for End, Side, and Satellite isomers was found to be dependent primarily on the number of the NPs in the superstructures rationalized with the help of electrical field simulations. Incubation of the label-free NP-NR assemblies with HeLa cells indicated sufficient field enhancement to detect structural lipids of mitochondria and potentially small metabolites. This provided the first proof-of-concept data for the possibility of real-time probing of the local organelle environment in live cells. Further studies should include structural optimization of the assemblies for multitarget monitoring of metabolic activity and further increase in complexity for applications in transformative optics.
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Affiliation(s)
- Liguang Xu
- School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, PRC
| | - Hua Kuang
- School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, PRC
| | - Chuanlai Xu
- School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, PRC
| | - Wei Ma
- School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, PRC
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, 48109
| | - Libing Wang
- School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, PRC
| | - Nicholas A. Kotov
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, 48109
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111
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Bao Y, Vigderman L, Zubarev ER, Jiang C. Robust multilayer thin films containing cationic thiol-functionalized gold nanorods for tunable plasmonic properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:923-30. [PMID: 22103248 DOI: 10.1021/la203993m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Gold nanorods have great potential in a variety of applications because of their unique physical properties. In this article, we present the layer-by-layer (LbL) assembly of thin films containing positively charged gold nanorods that are covalently functionalized by cationic thiol molecules. The cationic gold nanorods are uniformly distributed in ultrathin nanocomposite LbL thin films. We studied the collective surface plasmon resonance coupling in the LbL films via UV-visible spectroscopy and evaluated their application in the surface-enhanced Raman scattering detection of rhodamine 6G probe molecules. Furthermore, we successfully manufactured freestanding nanoscale thin films containing multilayers of gold nanorods with a total thickness of less than 50 nm. The surface morphology and their optical and mechanical properties were systematically investigated, and the polycationic gold nanorods were found to play an important role in manipulating the properties of the nanocomposite thin films. Our findings reveal that such nanorods are excellent building blocks for constructing functional LbL films with tunable plasmonic behavior and robust mechanical properties.
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Affiliation(s)
- Ying Bao
- Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
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112
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Lu LQ, Zheng Y, Qu WG, Yu HQ, Xu AW. Hydrophobic Teflon films as concentrators for single-molecule SERS detection. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33955b] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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113
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DuChene JS, Almeida RP, Wei WD. Facile synthesis of anisotropic Au@SiO2 core–shell nanostructures. Dalton Trans 2012; 41:7879-82. [DOI: 10.1039/c2dt30409k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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114
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Huang YF, Wu DY, Zhu HP, Zhao LB, Liu GK, Ren B, Tian ZQ. Surface-enhanced Raman spectroscopic study of p-aminothiophenol. Phys Chem Chem Phys 2012; 14:8485-97. [DOI: 10.1039/c2cp40558j] [Citation(s) in RCA: 219] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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115
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Shao Q, Que R, Cheng L, Shao M. Fast one-step silicon–hydrogen bond assembly of silver nanoparticles as excellent surface-enhanced Raman scattering substrates. RSC Adv 2012. [DOI: 10.1039/c2ra00971d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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116
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Zhang JB, Balla NK, Gao C, Sheppard CJR, Yung LYL, Rehman S, Teo JY, Kulkarni SR, Fu YH, Yin SJ. Surface Modified Gold Nanorods in Two Photon Luminescence Imaging. Aust J Chem 2012. [DOI: 10.1071/ch12037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Gold nanorods (AuNRs) possess unique optical properties which make them good contrast agents for optical microscopy. Their longitudinal plasmon resonance peak can be easily tuned from red to near infrared wavelength by increasing their aspect ratio to match the wavelengths of different imaging modalities. AuNRs are also stronger scatterers of light as compared with gold nanospheres. Nevertheless what sets them apart from other gold nanoparticles is their strong multiphoton luminescence. AuNRs are therefore being increasingly used as contrast agents for multiphoton microscopy of biological samples. In this study, control of the longitudinal resonance peak of gold nanorods is investigated with comparison of two chemical synthesis approaches. Both based on a seed-mediated method, one approach is to tune the aspect ratio through manipulation of the ratio of gold seeds to gold salt and the other is through variation of the volume of hydrochloric acid. The synthesized gold nanorods were made biocompatible by replacing the cytotoxic cetyltrimethylammonium bromide (CTAB) molecules with either silica (SiO2) or polyethylene glycol (PEG). Multiphoton imaging of gold nanorods taken up by cells was demonstrated and the effect of PEG chain length on passive uptake of gold nanorods by cells is discussed.
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117
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Cialla D, März A, Böhme R, Theil F, Weber K, Schmitt M, Popp J. Surface-enhanced Raman spectroscopy (SERS): progress and trends. Anal Bioanal Chem 2011; 403:27-54. [PMID: 22205182 DOI: 10.1007/s00216-011-5631-x] [Citation(s) in RCA: 402] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 11/10/2011] [Accepted: 12/01/2011] [Indexed: 12/12/2022]
Abstract
Surface-enhanced Raman spectroscopy (SERS) combines molecular fingerprint specificity with potential single-molecule sensitivity. Therefore, the SERS technique is an attractive tool for sensing molecules in trace amounts within the field of chemical and biochemical analytics. Since SERS is an ongoing topic, which can be illustrated by the increased annual number of publications within the last few years, this review reflects the progress and trends in SERS research in approximately the last three years. The main reason why the SERS technique has not been established as a routine analytic technique, despite its high specificity and sensitivity, is due to the low reproducibility of the SERS signal. Thus, this review is dominated by the discussion of the various concepts for generating powerful, reproducible, SERS-active surfaces. Furthermore, the limit of sensitivity in SERS is introduced in the context of single-molecule spectroscopy and the calculation of the 'real' enhancement factor. In order to shed more light onto the underlying molecular processes of SERS, the theoretical description of SERS spectra is also a growing research field and will be summarized here. In addition, the recording of SERS spectra is affected by a number of parameters, such as laser power, integration time, and analyte concentration. To benefit from synergies, SERS is combined with other methods, such as scanning probe microscopy and microfluidics, which illustrates the broad applications of this powerful technique.
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Affiliation(s)
- Dana Cialla
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, Germany
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118
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Le Ru EC, Grand J, Sow I, Somerville WRC, Etchegoin PG, Treguer-Delapierre M, Charron G, Félidj N, Lévi G, Aubard J. A scheme for detecting every single target molecule with surface-enhanced Raman spectroscopy. NANO LETTERS 2011; 11:5013-9. [PMID: 21985399 DOI: 10.1021/nl2030344] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is now a well-established technique for the detection, under appropriate conditions, of single molecules (SM) adsorbed on metallic nanostructures. However, because of the large variations of the SERS enhancement factor on the surface, only molecules located at the positions of highest enhancement, so-called hot-spots, can be detected at the single-molecule level. As a result, in all SM-SERS studies so far only a small fraction, typically less than 1%, of molecules are actually observed. This complicates the analysis of such experiments and means that trace detection via SERS can in principle still be vastly improved. Here we propose a simple scheme, based on selective adsorption of the target analyte at the SERS hot-spots only, that allows in principle detection of every single target molecule in solution. We moreover provide a general experimental methodology, based on the comparison between average and maximum (single molecule) SERS enhancement factors, to verify the efficiency of our approach. The concepts and tools introduced in this work can readily be applied to other SERS systems aiming for detection of every single target molecule.
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Affiliation(s)
- Eric C Le Ru
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand.
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119
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Shen X, Chen L, Li D, Zhu L, Wang H, Liu C, Wang Y, Xiong Q, Chen H. Assembly of colloidal nanoparticles directed by the microstructures of polycrystalline ice. ACS NANO 2011; 5:8426-8433. [PMID: 21942743 DOI: 10.1021/nn203399z] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We show that the microstructures of polycrystalline ice can serve as a confining template for one-dimensional assembly of colloidal nanoparticles. Upon simply freezing an aqueous colloid, the nanoparticles are excluded from ice grains and form chains in the ice veins. The nanoparticle chains are transferable and can be strengthened by polymer encapsulation. After coating with polyaniline shells, simple sedimentation is used to remove large aggregates, enriching single-line chains of 40 nm gold nanoparticles with a total length of several micrometers. When gold nanorods were used, they formed one-dimensional aggregates with specific end-to-end conformation, indicating the confining effects of the nanoscale ice veins at the final stage of freezing. The unbranched and ultralong plasmonic chains are of importance for future study of plasmonic coupling and development of plasmonic waveguides.
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Affiliation(s)
- Xiaoshuang Shen
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
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120
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Zhang X, Lu Z, Sim D, Li S, Feng Y, Ma J, Chen H, Boey F, Hng HH, Yan Q. Controlled Synthesis of Ag/Ag/C Hybrid Nanostructures and their Surface-Enhanced Raman Scattering Properties. Chemistry 2011; 17:13386-90. [DOI: 10.1002/chem.201102707] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Indexed: 11/08/2022]
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121
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Sindoro M, Feng Y, Xing S, Li H, Xu J, Hu H, Liu C, Wang Y, Zhang H, Shen Z, Chen H. Triple-Layer (Au@Perylene)@Polyaniline Nanocomposite: Unconventional Growth of Faceted Organic Nanocrystals on Polycrystalline Au. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102994] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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122
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Triple-Layer (Au@Perylene)@Polyaniline Nanocomposite: Unconventional Growth of Faceted Organic Nanocrystals on Polycrystalline Au. Angew Chem Int Ed Engl 2011; 50:9898-902. [DOI: 10.1002/anie.201102994] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Revised: 06/28/2011] [Indexed: 11/07/2022]
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123
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Liu S, Zheng G, Li J. Raman spectral study of metal-cytosine complexes: a density functional theoretical (DFT) approach. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1739-1746. [PMID: 21676649 DOI: 10.1016/j.saa.2011.05.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 05/12/2011] [Accepted: 05/16/2011] [Indexed: 05/30/2023]
Abstract
The fluctuation of surface-enhanced Raman scattering (SERS) spectra has been an obstacle to the analysis of the adsorbate on the metal surface. In this paper, we aim at using the density functional theory (DFT) to study the fluctuant Raman spectra of the cytosine molecule which interacts with a coinage metal atom or cation via N1 and N3 sites. The results show that the adsorption site strongly influences the Raman spectral property of cytosine molecule, especially the relative intensity of some bands. In addition, the SERS spectra of cytosine which is adsorbed on the gold, silver, and copper electrodes are measured, and the possible orientation and adsorption site of the cytosine molecule adsorbed on metal electrodes surface are proposed with the help of DFT simulations.
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Affiliation(s)
- Shuanjiang Liu
- School of Mathematics and Physics, Anyang Institute of Technology, Anyang 455000, China.
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124
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Wong YJ, Zhu L, Teo WS, Tan YW, Yang Y, Wang C, Chen H. Revisiting the Stöber method: inhomogeneity in silica shells. J Am Chem Soc 2011; 133:11422-5. [PMID: 21732677 DOI: 10.1021/ja203316q] [Citation(s) in RCA: 258] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We demonstrate that the silica shell on nanoparticles formed by a typical Stöber method is inhomogeneous in nature. The outer layer of the shell is chemically more robust than the inner layer, which can be selectively etched by hot water. Methods are developed to "harden" the soft silica shells. These new understandings are exploited to develop versatile and template-free approaches for fabricating sophisticated yolk-shell nanostructures.
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Affiliation(s)
- Yi Jian Wong
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
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125
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Influence of pH Value and Anion on Surface-Enhanced Raman Scattering of 2,6-Pyridinedicarboxylic Acid on Gold Nanoparticle Surface. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2011. [DOI: 10.1016/s1872-2040(10)60457-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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126
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Lee A, Andrade GFS, Ahmed A, Souza ML, Coombs N, Tumarkin E, Liu K, Gordon R, Brolo AG, Kumacheva E. Probing Dynamic Generation of Hot-Spots in Self-Assembled Chains of Gold Nanorods by Surface-Enhanced Raman Scattering. J Am Chem Soc 2011; 133:7563-70. [DOI: 10.1021/ja2015179] [Citation(s) in RCA: 237] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Lee
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - Gustavo F. S. Andrade
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia V8W 3V6, Canada
| | - Aftab Ahmed
- Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
| | - Michele L. Souza
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia V8W 3V6, Canada
| | - Neil Coombs
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - Ethan Tumarkin
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - Kun Liu
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - Reuven Gordon
- Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
| | - Alexandre G. Brolo
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia V8W 3V6, Canada
| | - Eugenia Kumacheva
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
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127
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Sreeprasad TS, Pradeep T. Reversible assembly and disassembly of gold nanorods induced by EDTA and its application in SERS tuning. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:3381-3390. [PMID: 21366283 DOI: 10.1021/la104828e] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A facile and reversible method for assembling and disassembling gold nanorods (GNRs) using a common chelating agent, ethylenediaminetetraacetic acid (EDTA), is reported. Assembly was induced by the electrostatic interaction between the cetyltrimethylammonium bromide (CTAB) bilayer present on GNRs and EDTA. At lower concentrations of EDTA, end-to-end assembled chains were formed. At higher concentrations of EDTA, these chains come together to form sheet-like structures. The complex of CTAB and EDTA, being labile, disassembles in the presence of stronger chelating agents. Upon addition of metal ions having higher formation constants, EDTA detaches from the GNRs and forms stronger complexes with metal ions, resulting in disassembly. Characteristic changes were observed in the UV/vis spectra. Addition of EDTA resulted in a red shift of longitudinal surface plasmon (LSP) resonance at lower concentrations, indicating an end-to-end assembly. At higher concentrations, the characteristic of side-by-side assembly was seen in the UV/vis spectra. TEM analysis proved the existence of end-to-end chains at lower concentrations of EDTA and side-by-side assembled sheet-like structures at higher concentrations. The addition of metal ions induced disassembly. Even 2 ppb of metal ion was detected using the spectral changes. Disassembly was studied in detail, taking Pb(II) as the model system. Upon addition of Pb(II), TSP showed a blue shift and decreased in intensity while the LSP showed a red shift and increased in intensity. A new peak at a higher wavelength region emerged, pointing to the existence of both side-by-side and end-to-end assembly in the system. TEM analysis showed that the disassembly involves the formation of bundled chains which may be the reason for the observed spectral changes. Surface-enhanced Raman scattering (SERS) activity of the system could be tuned by controlling the concentration of EDTA and the metal ion, Pb(II).
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Affiliation(s)
- T S Sreeprasad
- DST Unit of Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai-600 036, India
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128
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Chen T, Du C, Tan LH, Shen Z, Chen H. Site-selective localization of analytes on gold nanorod surface for investigating field enhancement distribution in surface-enhanced Raman scattering. NANOSCALE 2011; 3:1575-1581. [PMID: 21286607 DOI: 10.1039/c0nr00845a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Understanding detailed electric near-field distributions around noble metal nanostructures is crucial to the rational design of metallic substrates for maximizing surface-enhanced Raman scattering (SERS) efficiency. We obtain SERS signals from specific regions such as the ends, the sides and the entire surfaces of gold nanorod by chemisorbing analytes on the respective areas. Different SERS intensities from designated surfaces reflect their electric near-field intensities and thus the distributions. Our experimental results show that approximately 65% of the SERS enhancement emanated from the ends of gold nanorods which occupies only 28% of the total surface area, quantitatively exhibiting the strongly localized electric field around the ends. The reliability and generality of the investigation is confirmed by employing analytes with different chemical characteristics: positively and negatively charged, neutral, hydrophobic and hydrophilic ligands, which are selectively adsorbed on the different sites. Numerical simulations of the electric near-field distributions around the nanorod are in well agreement with our experimental results. In addition, we observed that the SERS intensities of colloidal gold nanospheres are independent of surface areas being functionalized by analytes, indicating a homogenous electric near-field distribution around gold nanospheres.
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Affiliation(s)
- Tao Chen
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore637371.
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129
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Romo-Herrera JM, Alvarez-Puebla RA, Liz-Marzán LM. Controlled assembly of plasmonic colloidal nanoparticle clusters. NANOSCALE 2011; 3:1304-15. [PMID: 21229160 DOI: 10.1039/c0nr00804d] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Coupling of localized surface plasmon resonances results in singular effects at the void space between noble metal nanoparticles. However, implementation of practical applications based on plasmon coupling calls for the high yield production of metal nanoparticle clusters (dimers, trimers, tetramers, …) with small gaps. Therefore, controlled assembly using colloid chemistry methods is an emerging and promising field. We present a brief overview over the controlled assembly of plasmonic nanoparticle clusters by colloid chemistry methods, together with a description of their plasmonic properties and some applications, with an emphasis in sensing through surface-enhanced Raman scattering spectroscopy for bio-detection purposes. We point out the important role of separation methods to obtain colloidal clusters in high yield. A special encouragement to explore assembly of anisotropic building blocks is pursued.
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Affiliation(s)
- José M Romo-Herrera
- Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310, Vigo, Spain.
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130
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Chrimes AF, Kayani AA, Khoshmanesh K, Stoddart PR, Mulvaney P, Mitchell A, Kalantar-Zadeh K. Dielectrophoresis-Raman spectroscopy system for analysing suspended nanoparticles. LAB ON A CHIP 2011; 11:921-8. [PMID: 21267497 DOI: 10.1039/c0lc00481b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A microfluidic dielectrophoresis platform consisting of curved microelectrodes was developed and integrated with a Raman spectroscopy system. The electrodes were patterned on a quartz substrate, which has insignificant Raman response, and integrated with a microfluidic channel that was imprinted in poly-dimethylsiloxane (PDMS). We will show that this novel integrated system can be efficiently used for the determination of suspended particle types and the direct mapping of their spatial concentrations. We will also illustrate the system's unique advantages over conventional optical systems. Nanoparticles of tungsten trioxide (WO(3)) and polystyrene were used in the investigations, as they are Raman active and can be homogeneously suspended in water.
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Affiliation(s)
- Adam F Chrimes
- School of Electrical and Computer Engineering, RMIT University, Victoria, Australia.
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131
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Boca S, Rugina D, Pintea A, Barbu-Tudoran L, Astilean S. Flower-shaped gold nanoparticles: synthesis, characterization and their application as SERS-active tags inside living cells. NANOTECHNOLOGY 2011; 22:055702. [PMID: 21178234 DOI: 10.1088/0957-4484/22/5/055702] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The detection of Raman signals inside living cells is a topic of great interest in the study of cell biology mechanisms and for diagnostic and therapeutic applications. This work presents the synthesis and characterization of flower-shaped gold nanoparticles and demonstrates their applicability as SERS-active tags for cellular spectral detection. The particles were synthesized by a facile, rapid new route that uses ascorbic acid as a reducing agent of gold salt. Two triarylmethane dyes which are widely used as biological stains, namely malachite green oxalate and basic fuchsin, were used as Raman-active molecules and the polymer mPEG-SH as capping material. The as-prepared SERS-active nanoparticles were tested on a human retinal pigment epithelial cell line and found to present a low level of cytotoxicity and high chemical stability together with SERS sensitivity down to picomolar particle concentrations.
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Affiliation(s)
- Sanda Boca
- Nanobiophotonics Center, Institute for Interdisciplinary Research in Nanobioscience, Babes-Bolyai University, Cluj-Napoca, Romania.
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132
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Bao Z, Sun Z, Xiao M, Chen H, Tian L, Wang J. Transverse oxidation of gold nanorods assisted by selective end capping of silver oxide. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10371g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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133
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Xing S, He J, Liu X, Chen H. A symmetry-adapted shell transformation of core–shell nanoparticles for binary nanoassembly. Chem Commun (Camb) 2011; 47:12533-5. [DOI: 10.1039/c1cc14851f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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134
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Xu L, Kuang H, Wang L, Xu C. Gold nanorod ensembles as artificial molecules for applications in sensors. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11905b] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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135
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Zhong L, Zhou X, Bao S, Shi Y, Wang Y, Hong S, Huang Y, Wang X, Xie Z, Zhang Q. Rational design and SERS properties of side-by-side, end-to-end and end-to-side assemblies of Au nanorods. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11193k] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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136
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Lee CH, Tian L, Singamaneni S. Paper-based SERS swab for rapid trace detection on real-world surfaces. ACS APPLIED MATERIALS & INTERFACES 2010; 2:3429-35. [PMID: 21128660 DOI: 10.1021/am1009875] [Citation(s) in RCA: 206] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
One of the important but often overlooked considerations in the design of surface-enhanced Raman scattering (SERS) substrates for trace detection is the efficiency of sample collection. Conventional designs based on rigid substrates such as silicon, alumina, and glass resist conformal contact with the surface under investigation, making the sample collection inefficient. We demonstrate a novel SERS substrate based on common filter paper adsorbed with gold nanorods, which allows conformal contact with real-world surfaces, thus dramatically enhancing the sample collection efficiency compared to conventional rigid substrates. We demonstrate the detection of trace amounts of analyte (140 pg spread over 4 cm2) by simply swabbing the surface under investigation with the novel SERS substrate. The hierarchical fibrous structure of paper serves as a 3D vasculature for easy uptake and transport of the analytes to the electromagnetic hot spots in the paper. Simple yet highly efficient and cost-effective SERS substrate demonstrated here brings SERS-based trace detection closer to real-world applications.
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137
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Gehan H, Fillaud L, Chehimi MM, Aubard J, Hohenau A, Felidj N, Mangeney C. Thermo-induced electromagnetic coupling in gold/polymer hybrid plasmonic structures probed by surface-enhanced raman scattering. ACS NANO 2010; 4:6491-6500. [PMID: 21028846 DOI: 10.1021/nn101451q] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This paper describes a general stepwise strategy combining diazonium salt, surface-initiated atom transfer radical polymerization (SI-ATRP), and click chemistry for an efficient gold surface functionalization by poly(N-isopropylacrylamide) (PNIPAM) brushes and gold nanoparticle assemblies. We designed by this way a new plasmonic device made of gold nanoparticles separated from a gold film through a thermoresponsive polymer layer. This organic layer responds to temperature variations by conformational changes (with a characteristic temperature called the lower critical solution temperature, LCST) and is therefore able to vary the distance between the gold nanoparticles and the gold film. The optical properties of these stimulable substrates were probed by surface-enhanced raman scattering (SERS) using methylene blue (MB) as a molecular probe. We show that an increase of the external temperature reversibly induces a significant enhancement of the MB SERS signal. This was attributed to a stronger interaction between the gold nanoparticles and the gold substrate. The temperature-responsive plasmonic devices developed in this paper thus provide a dynamic SERS platform, with thermally switchable electromagnetic coupling between the gold nanoparticles and the gold surface.
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Affiliation(s)
- Hélène Gehan
- ITODYS, Université Paris Diderot-Paris 7 (UMR CNRS 7086), 15 rue Jean de Baïf, 75013 Paris, France
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138
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Canpean V, Iosin M, Astilean S. Disentangling SERS signals from two molecular species: A new evidence for the production of p,p′-dimercaptoazobenzene by catalytic coupling reaction of p-aminothiophenol on metallic nanostructures. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.10.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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139
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Yang M, Chen G, Zhao Y, Silber G, Wang Y, Xing S, Han Y, Chen H. Mechanistic investigation into the spontaneous linear assembly of gold nanospheres. Phys Chem Chem Phys 2010; 12:11850-60. [DOI: 10.1039/c0cp00127a] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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