301
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Straney PJ, Marbella LE, Andolina CM, Nuhfer NT, Millstone JE. Decoupling mechanisms of platinum deposition on colloidal gold nanoparticle substrates. J Am Chem Soc 2014; 136:7873-6. [PMID: 24856921 DOI: 10.1021/ja504294p] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Nanoscale platinum materials are essential components in many technologies, including catalytic converters and fuel cells. Combining Pt with other metals can enhance its performance and/or decrease the cost of the technology, and a wide range of strategies have been developed to capitalize on these advantages. However, wet chemical synthesis of Pt-containing nanoparticles (NPs) is challenging due to the diverse metal segregation and metal-metal redox processes possible under closely related experimental conditions. Here, we elucidate the relationship between Pt(IV) speciation and the formation of well-known NP motifs, including frame-like and core-shell morphologies, in Au-Pt systems. We leverage insights gained from these studies to induce a controlled transition from redox- to surface chemistry-mediated growth pathways, resulting in the formation of Pt NPs in epitaxial contact and linear alignment along a gold nanoprism substrate. Mechanistic investigations using a combination of electron microscopy and (195)Pt NMR spectroscopy identify Pt(IV) speciation as a crucial parameter for understanding and controlling the formation of Pt-containing NPs. Combined, these findings point toward fully bottom-up methods for deposition and organization of NPs on colloidal plasmonic substrates.
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Affiliation(s)
- Patrick J Straney
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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302
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Sun J, Wu H, Jin Y. Synthesis of thiolated Ag/Au bimetallic nanoclusters exhibiting an anti-galvanic reduction mechanism and composition-dependent fluorescence. NANOSCALE 2014; 6:5449-57. [PMID: 24722873 DOI: 10.1039/c4nr00445k] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We report a direct one-pot approach, employing 11-mercaptoundecanoic acid (11-MUA) as a reducing and capping agent, for the preparation of fluorescent Ag/Au bimetallic nanoclusters (Ag/AuNCs) from HAuCl4 and AgNO3 in basic aqueous solution at room temperature. Unlike the monocomponent 11-MUA-AgNCs with negligible fluorescence, the as-prepared 11-MUA-Ag/AuNCs exhibit similar average diameters of ∼1.8 nm but much stronger and tunable fluorescence by varying the concentration ratios of AgNO3 to HAuCl4 in the synthesis. The quantum yield of the 11-MUA-Ag/AuNCs can reach 6.81% at a Ag-to-Au molar ratio of 1 : 2, nearly 3-fold higher than the monocomponent 11-MUA-AuNCs (2.38%) of similar sizes. More importantly, the occurrence of the reaction between Ag(+) ions and Au(0) of 11-MUA-AuNCs (which is opposite to the classic galvanic theory) and the coexistence of Ag(0) and Au(+) in the final NC products, are revealed by thorough analysis of XPS data. The anti-galvanic reduction, that is, metal ions are replaced by less reactive metals, has been further demonstrated through the reaction between the as-obtained purified monocomponent 11-MUA-AuNCs and Ag(+) ions. Direct electrochemical insights into the anti-galvanic reduction mechanism were provided by cyclic voltammetry characterizations of the NCs, and the universality of the anti-galvanic reduction was tested by preparing thiolated Pt/Au bimetallic NCs using platinum instead of silver in our synthetic system.
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Affiliation(s)
- Jian Sun
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
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303
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Gao C, Hu Y, Wang M, Chi M, Yin Y. Fully alloyed Ag/Au nanospheres: combining the plasmonic property of Ag with the stability of Au. J Am Chem Soc 2014; 136:7474-9. [PMID: 24821567 DOI: 10.1021/ja502890c] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report that fully alloyed Ag/Au nanospheres with high compositional homogeneity ensured by annealing at elevated temperatures show large extinction cross sections, extremely narrow bandwidths, and remarkable stability in harsh chemical environments. Nanostructures of Ag are known to have much stronger surface plasmon resonance than Au, but their applications in many areas have been very limited by their poor chemical stability against nonideal chemical environments. Here we address this issue by producing fully alloyed Ag/Au nanospheres through a surface-protected annealing process. A critical temperature has been found to be around 930 °C, below which the resulting alloy nanospheres, although significantly more stable than pure silver nanoparticles, can still gradually decay upon extended exposure to a harsh etchant. Nanospheres annealed above the critical temperature show a homogeneous distribution of Ag and Au, minimal crystallographic defects, and the absence of structural and compositional interfaces, which account for the extremely narrow bandwidths of the surface plasmon resonance and may enable many plasmonic applications with high performance and long lifetime, especially for those involving corrosive species.
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Affiliation(s)
- Chuanbo Gao
- Center for Materials Chemistry, Frontier Institute of Science and Technology, Xi'an Jiaotong University , Xi'an, Shaanxi 710054, China
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304
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Datta S, Saha-Dasgupta T. Vegard's law-like behavior for Mn(m)Tc(n) alloy clusters: a first-principles prediction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:185004. [PMID: 24728079 DOI: 10.1088/0953-8984/26/18/185004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
With a view to gaining an understanding of the alloying tendency of bimetallic nanoalloy clusters of isoelectronic constituents, we studied the structural and mixing behavior of MnmTcn alloy clusters with m + n = 13 for all possible compositions, using first-principles electronic structure calculations. Our study reports a favorable mixing tendency for the alloy clusters. The average bond lengths of the minimum energy structures show an overall linear variation with concentration, indicating a Vegard's law-like variation for the nanoalloy clusters, though the optimized structures undergo a structural transition from a closed and compact structure for the Mn-rich alloy clusters to an open layered-like structure for the Tc-rich alloy clusters. We work out a continuous and smooth interplay between hybridization and magnetization properties of the alloy clusters, which plays a vital role in the Vegard's law-like variation in their average bond lengths.
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Affiliation(s)
- S Datta
- Department of Condensed Matter Physics and Material Sciences, S N Bose National Centre for Basic Sciences, JD Block, Sector-III, Salt Lake City, Kolkata 700 098, India
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305
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Sakai T, Enomoto H, Sakai H, Abe M. Hydrogen-assisted fabrication of spherical gold nanoparticles through sonochemical reduction of tetrachloride gold(III) ions in water. ULTRASONICS SONOCHEMISTRY 2014; 21:946-950. [PMID: 24405710 DOI: 10.1016/j.ultsonch.2013.12.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 12/09/2013] [Accepted: 12/11/2013] [Indexed: 06/03/2023]
Abstract
Spherical gold nanoparticles (AuNPs) were selectively synthesized through sonochemical reduction of tetrachloride gold(III) ions ([AuCl4](-)) in an aqueous solution of hydrogen tetrachloroaurate(III) tetrahydrate (HAuCl4 · 4H2O) with the aid of hydrogen (H2) gas in the absence of any additional capping agents. On the other hand, various shaped-AuNPs such as spherical nanoparticles, triangular and hexagonal plates were formed from sonochemical reduction of [AuCl4](-) in argon (Ar)-, nitrogen (N2)- or oxygen (O2)-purged aqueous [AuCl4](-) solutions. The selective fabrication of spherical AuNPs assisted by H2 gas is most likely attributed to the generation of hydrogen radicals (H) promoted by the reaction of H2 introduced and hydrogen oxide radicals (OH) produced by sonolysis of water.
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Affiliation(s)
- Toshio Sakai
- Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
| | - Hiroto Enomoto
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Hideki Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Masahiko Abe
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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306
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307
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Ye SJ, Kim DY, Kang SW, Choi KW, Han SW, Park OO. Synthesis of chestnut-bur-like palladium nanostructures and their enhanced electrocatalytic activities for ethanol oxidation. NANOSCALE 2014; 6:4182-4187. [PMID: 24608517 DOI: 10.1039/c3nr06410g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a facile method for the synthesis of Pd nanostructures with highly open structure and huge surface area by reducing Na₂PdCl₄ with ascorbic acid and using cetylpyridinium chloride (CPC) as a surfactant in an aqueous solution. The prepared Pd nanostructures had an average overall size of 70 nm and were composed of dozens of needle-like thin arms, originating from the same core, with an average thickness of 2.3 nm; the arms looked like chestnut-burs. Time evolution of Pd nanostructures implied that small Pd particles generated at the early stage of the reaction by fast reduction grew via the particle attachment growth mechanism. The morphology and size of the Pd nanostructures could be readily controlled by varying the concentration of CPC; depending on the amount of CPC, the reduction rates varied the morphology of the Pd nanostructures. Because of the huge surface area and possible catalytically active sites, the prepared chestnut-bur-like Pd nanostructures exhibited greater electrocatalytic activity toward ethanol electrooxidation compared to other Pd nanocatalysts, including cubic and octahedral Pd nanocrystals, and even commercial Pd/C.
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Affiliation(s)
- Seong Ji Ye
- Department of Chemical and Biomolecular Engineering (BK21+ graduate program), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
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308
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Crespo J, Ibarra A, López-de-Luzuriaga JM, Monge M, Olmos ME. Synthesis and Plasmonic Properties of Core-Shell Bimetallic Silver-Gold Nanoprisms Obtained through an Organometallic Route. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201400023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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309
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Sauerbeck C, Haderlein M, Schürer B, Braunschweig B, Peukert W, Klupp Taylor RN. Shedding light on the growth of gold nanoshells. ACS NANO 2014; 8:3088-96. [PMID: 24552660 DOI: 10.1021/nn500729r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanostructured particles containing noble metals can have highly tunable localized surface plasmon resonances and are therefore of particular interest for numerous applications. Nanoshells comprising a dielectric core and gold or silver shell are a widely researched systems because of the strong dependence of their optical properties on the ratio of core diameter to shell thickness. Although seeded-growth procedures have been developed to produce these particles, the many reported studies show significant variation in the nanoshell morphologies and hence optical properties. In order to establish processes that reproducibly synthesize nanoshells with high optical quality, it is necessary to develop techniques that monitor changes at the core particle surface during shell growth. For that purpose, we have carried out in situ nonlinear second-harmonic scattering (SHS) and linear vis-NIR extinction spectroscopy simultaneously during the seeded growth of gold nanoshells on silica core particles. Our SHS measurements show a striking variation in the nonlinear optical properties of the growing gold nanoshells. In comparison with linear optical measurements and with scanning electron microscopy (SEM) images made of gold nanoshells produced with varying shell completenesses, the SHS signal was observed to reach a peak intensity at a stage prior to shell closure. We attribute this high sensitivity of the SHS signal to the incomplete nanoshell surface morphology to the generation and subsequent degeneration of regions of electric field enhancement at gaps between isolated gold islands, which grow and coalesce. This conclusion is corroborated by finite-difference time-domain simulations of incomplete nanoshells. We suggest that the in situ analytical approach demonstrated here offers significant promise for future activities regarding the in-process optimization of the morphology and optical properties of metal nanoshells and other nanostructured plasmonic particles.
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Affiliation(s)
- Christian Sauerbeck
- Institute of Particle Technology (LFG), University of Erlangen-Nuremberg , Cauerstrasse 4, 91058 Erlangen, Germany
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310
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Yu K, Sader JE, Zijlstra P, Hong M, Xu QH, Orrit M. Probing silver deposition on single gold nanorods by their acoustic vibrations. NANO LETTERS 2014; 14:915-922. [PMID: 24422602 DOI: 10.1021/nl404304h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Acoustic vibrations of single gold nanorods coated with silver were investigated. We used single-particle pump-probe spectroscopy to monitor the silver deposition through the particle vibrations. Two vibration modes, the breathing mode and extensional mode, are observed, and the vibrational frequencies are measured as functions of the amount of silver deposited on single gold nanorods. The breathing mode frequency was found to decrease with silver deposition, while the extensional mode frequency was almost constant for silver shells up to 6 nm. The frequency changes agree with a model based on continuum mechanics and on the assumption of a uniform silver coating. The quality factors for the breathing mode and the extensional mode are hardly affected by silver deposition, indicating that the introduced interface between gold and silver contributes negligibly to the damping of the particle vibrations. Finally, we demonstrated that an atomic layer of silver can be detected using the particle acoustic vibrations.
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Affiliation(s)
- Kuai Yu
- Institute of Physics, Leiden University , Rapenburg 70, 2311 EZ Leiden, The Netherlands
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311
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Hong X, Yin Z, Fan Z, Tay YY, Chen J, Du Y, Xue C, Chen H, Zhang H. Periodic AuAg-Ag₂S heterostructured nanowires. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:479-482. [PMID: 24106200 DOI: 10.1002/smll.201302304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2013] [Indexed: 06/02/2023]
Affiliation(s)
- Xun Hong
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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312
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Arnold M, Blaber M, Ford M. Local plasmon resonances of metal-in-metal core-shells. OPTICS EXPRESS 2014; 22:3186-3198. [PMID: 24663610 DOI: 10.1364/oe.22.003186] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigate the tunability and strength of the localized surface plasmons of binary metal-in-metal core-shells. Ellipsoids are used as an analytical model to show how the fill factor continuously tunes a hybridized mode between those of the constituents, suggesting the use of metal combinations with widely differing plasma frequencies for broad tunability. A quasistatic eigenmode method is used separate geometric and material parameters to facilitate prediction of hybridized dipole modes in arbitrary shapes. A modified ellipsoid model is found to adequately describe the symmetric dipole-dipole resonance of well-rounded cuboids.
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313
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Chandra S, Huls NAF, Phan MH, Srinath S, Garcia MA, Lee Y, Wang C, Sun S, Iglesias Ò, Srikanth H. Exchange bias effect in Au-Fe3O4 nanocomposites. NANOTECHNOLOGY 2014; 25:055702. [PMID: 24406347 DOI: 10.1088/0957-4484/25/5/055702] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report exchange bias (EB) effect in the Au-Fe3O4 composite nanoparticle system, where one or more Fe3O4 nanoparticles are attached to an Au seed particle forming 'dimer' and 'cluster' morphologies, with the clusters showing much stronger EB in comparison with the dimers. The EB effect develops due to the presence of stress at the Au-Fe3O4 interface which leads to the generation of highly disordered, anisotropic surface spins in the Fe3O4 particle. The EB effect is lost with the removal of the interfacial stress. Our atomistic Monte Carlo studies are in excellent agreement with the experimental results. These results show a new path towards tuning EB in nanostructures, namely controllably creating interfacial stress, and opens up the possibility of tuning the anisotropic properties of biocompatible nanoparticles via a controllable exchange coupling mechanism.
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Affiliation(s)
- Sayan Chandra
- Physics Department, University of South Florida, Tampa, FL 33620, USA
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314
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Chen Y, Zeng D, Zhang K, Lu A, Wang L, Peng DL. Au-ZnO hybrid nanoflowers, nanomultipods and nanopyramids: one-pot reaction synthesis and photocatalytic properties. NANOSCALE 2014; 6:874-881. [PMID: 24270554 DOI: 10.1039/c3nr04558g] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The preparation of noble metal-semiconductor hybrid nanocrystals with controlled morphologies has received intensive interest in recent years. In this study, facile one-pot reactions have been developed for the synthesis of Au-ZnO hybrid nanocrystals with different interesting morphologies, including petal-like and urchin-like nanoflowers, nanomultipods and nanopyramids. In the synthesis strategy, oleylamine-containing solution serves as the reaction medium, and the in situ generated Au seeds play an important role in the subsequently induced growth of ZnO nanocrystals. With the aid of several surfactants, hybrid nanocrystals with different morphologies that have considerable influences on their optical and photocatalytic activities are readily achieved. Through high-resolution transmission electron microscopy measurements, an observed common orientation relationship between ZnO and Au is that ZnO nanocrystals prefer to grow with their polar {001} facets on the {111} facets of Au nanocrystals, and well-defined interfaces are evident. Surface plasmon resonance bands of Au with different positions are observed in the UV-vis spectra, and the UV and visible emissions of ZnO are found to be dramatically reduced. Finally, the as-prepared Au-ZnO nanocrystals exhibit excellent photocatalytic activity for the photodegradation of rhodamine B compared with pure ZnO nanocrystals. The Au-ZnO hybrid nanopyramids show the highest catalytic efficiency, which is correlated with the exposed crystal facets, crystallinity and the formation of hybrid nanostructures. The as-prepared Au-ZnO hybrid nanocrystals are expected to find diverse potential applications in the fields such as photocatalysis, solar energy conversion, sensing and biological detection.
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Affiliation(s)
- Yuanzhi Chen
- Department of Materials Science and Engineering, College, of Materials, Xiamen University, Xiamen, 361005, P.R. China.
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315
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Jia K, Khaywah MY, Li Y, Bijeon JL, Adam PM, Déturche R, Guelorget B, François M, Louarn G, Ionescu RE. Strong improvements of localized surface plasmon resonance sensitivity by using Au/Ag bimetallic nanostructures modified with polydopamine films. ACS APPLIED MATERIALS & INTERFACES 2014; 6:219-227. [PMID: 24281403 DOI: 10.1021/am403943q] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the present work, the standard monometallic localized surface plasmon resonance (LSPR) biosensing sensitivity is highly improved when using a new system based on glass substrates modified with high-temperature annealed gold/silver bimetallic nanoparticles (Au/Ag bimetallic NPs) coated with polydopamine films before biomolecule specific immobilization. Thus, different zones of bimetallic NPs are spatially created onto a glass support thanks to a commercial transmission electron microscopy (TEM) grid marker in combination with two sequential evaporations of continuous films of gold (4 nm) and silver (2 nm) and followed by annealing at 500 °C for 8 h. By using the scanning electron microscopy (SEM), it is found that annealed Au/Ag bimetallic NPs have uniform size and shape distribution that exhibited a sharper well-defined LSPR resonant peak when compared with that of monometallic Au NPs and thereby contributing to an improved sensitivity in LSPR biosensor application. The controlled micropatterns consisting of bimetallic particles are used in the construction of LSPR biochips for high-throughput detection of different concentrations of a model antigen named bovine serum albumin (BSA) on a single glass sample, with a lower limit of detection of 0.01 ng/mL under the optimized conditions.
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Affiliation(s)
- Kun Jia
- Laboratoire de Nanotechnologie et d'Instrumentation Optique and ‡Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée, UMR-STMR CNRS 6279, Institute Charles Delaunay, Université de Technologie de Troyes , 12 Rue Marie Curie CS 42060, 10004 Troyes Cedex, France
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316
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Xu S, Li H, Wang L, Yue Q, Sixiu S, Liu J. One-pot synthesis of Ag@Cu yolk–shell nanostructures and their application as non-enzymatic glucose biosensors. CrystEngComm 2014. [DOI: 10.1039/c4ce01074d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
In this report, Ag@Cu yolk–shell nanostructures have been synthesized through a facile one-pot hydrothermal method.
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Affiliation(s)
- Shuling Xu
- Department of Chemistry
- Liaocheng University
- Liaocheng, PR China
| | - Haibo Li
- Department of Chemistry
- Liaocheng University
- Liaocheng, PR China
| | - Lei Wang
- Department of Chemistry
- Liaocheng University
- Liaocheng, PR China
| | - Qiaoli Yue
- Department of Chemistry
- Liaocheng University
- Liaocheng, PR China
| | - Sun Sixiu
- Department of Chemistry
- Shandong University
- Jinan, PR China
| | - Jifeng Liu
- Department of Chemistry
- Liaocheng University
- Liaocheng, PR China
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317
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Bauch M, Toma K, Toma M, Zhang Q, Dostalek J. Plasmon-Enhanced Fluorescence Biosensors: a Review. PLASMONICS (NORWELL, MASS.) 2014; 9:781-799. [PMID: 27330521 PMCID: PMC4846700 DOI: 10.1007/s11468-013-9660-5] [Citation(s) in RCA: 201] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 12/06/2013] [Indexed: 05/18/2023]
Abstract
Surfaces of metallic films and metallic nanoparticles can strongly confine electromagnetic field through its coupling to propagating or localized surface plasmons. This interaction is associated with large enhancement of the field intensity and local optical density of states which provides means to increase excitation rate, raise quantum yield, and control far field angular distribution of fluorescence light emitted by organic dyes and quantum dots. Such emitters are commonly used as labels in assays for detection of chemical and biological species. Their interaction with surface plasmons allows amplifying fluorescence signal (brightness) that accompanies molecular binding events by several orders of magnitude. In conjunction with interfacial architectures for the specific capture of target analyte on a metallic surface, plasmon-enhanced fluorescence (PEF) that is also referred to as metal-enhanced fluorescence (MEF) represents an attractive method for shortening detection times and increasing sensitivity of various fluorescence-based analytical technologies. This review provides an introduction to fundamentals of PEF, illustrates current developments in design of metallic nanostructures for efficient fluorescence signal amplification that utilizes propagating and localized surface plasmons, and summarizes current implementations to biosensors for detection of trace amounts of biomarkers, toxins, and pathogens that are relevant to medical diagnostics and food control.
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Affiliation(s)
- Martin Bauch
- AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria
| | - Koji Toma
- AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria
- Present Address: Forschungszentrum Jülich GmbH, Jülich, 52425 Germany
| | - Mana Toma
- AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria
- Present Address: Forschungszentrum Jülich GmbH, Jülich, 52425 Germany
| | - Qingwen Zhang
- AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria
- Present Address: Department of Physical Chemistry, School of Chemistry, BIT-Beijing Institute of Technology, Beijing, 100081 China
| | - Jakub Dostalek
- AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria
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318
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Sardar D, Neogi SK, Bandyopadhyay S, Satpati B, Jain R, Gopinath CS, Bala T. A facile method for the synthesis of Co-core Au-shell nanohybrid. NEW J CHEM 2014. [DOI: 10.1039/c4nj00733f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Heterostructured Co–Au core–shell nanoparticles have been synthesized by reducing AuCl4− ions on cobalt nanoparticles after a minor but effective modification of cobalt surface by an amine.
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Affiliation(s)
- Debasmita Sardar
- Department of Chemistry
- University of Calcutta
- Kolkata-700009, India
- CRNN
- University of Calcutta
| | - S. K. Neogi
- CRNN
- University of Calcutta
- Kolkata-700098, India
- Department of Physics
- University of Calcutta
| | - S. Bandyopadhyay
- CRNN
- University of Calcutta
- Kolkata-700098, India
- Department of Physics
- University of Calcutta
| | - Biswarup Satpati
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- Kolkata-64, India
| | - Ruchi Jain
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008, India
| | - Chinnakonda S. Gopinath
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008, India
| | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata-700009, India
- CRNN
- University of Calcutta
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319
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Misra M, Kapur P, Nayak MK, Singla M. Synthesis and visible photocatalytic activities of a Au@Ag@ZnO triple layer core–shell nanostructure. NEW J CHEM 2014. [DOI: 10.1039/c4nj00569d] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible light induced photocatalytic mechanism of Au@Ag@ZnO core–shell nanostructure and kinetics of methyl orange (MO) photo degradation by ZnO, Au@ZnO, Au@Ag@ZnO and TiO2.
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Affiliation(s)
- Mrinmoy Misra
- Material Research Division
- Academy of Scientific & Innovative Research (AcSIR)
- Central Scientific Instruments Organisation (CSIO)
- Chandigarh, India
| | - Pawan Kapur
- Material Research Division
- Academy of Scientific & Innovative Research (AcSIR)
- Central Scientific Instruments Organisation (CSIO)
- Chandigarh, India
| | - Manoj Kumar Nayak
- Material Research Division
- Academy of Scientific & Innovative Research (AcSIR)
- Central Scientific Instruments Organisation (CSIO)
- Chandigarh, India
| | - MadanLal Singla
- Material Research Division
- Academy of Scientific & Innovative Research (AcSIR)
- Central Scientific Instruments Organisation (CSIO)
- Chandigarh, India
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320
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Sotiriou GA, Etterlin GD, Spyrogianni A, Krumeich F, Leroux JC, Pratsinis SE. Plasmonic biocompatible silver–gold alloyed nanoparticles. Chem Commun (Camb) 2014; 50:13559-62. [DOI: 10.1039/c4cc05297h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Nanoalloying Ag with Au minimizes nanoparticle surface oxidation and subsequent toxic Ag+ ion release rendering such nanoparticles safer for theranostic applications.
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Affiliation(s)
- Georgios A. Sotiriou
- Particle Technology Laboratory
- Institute of Process Engineering
- Department of Mechanical and Process Engineering
- ETH Zurich
- Zurich 8092, Switzerland
| | - Gion Diego Etterlin
- Particle Technology Laboratory
- Institute of Process Engineering
- Department of Mechanical and Process Engineering
- ETH Zurich
- Zurich 8092, Switzerland
| | - Anastasia Spyrogianni
- Particle Technology Laboratory
- Institute of Process Engineering
- Department of Mechanical and Process Engineering
- ETH Zurich
- Zurich 8092, Switzerland
| | - Frank Krumeich
- Particle Technology Laboratory
- Institute of Process Engineering
- Department of Mechanical and Process Engineering
- ETH Zurich
- Zurich 8092, Switzerland
| | - Jean-Christophe Leroux
- Drug Formulation & Delivery
- Institute of Pharmaceutical Sciences
- Department of Chemistry and Applied Biosciences
- ETH Zurich
- Zurich 8093, Switzerland
| | - Sotiris E. Pratsinis
- Particle Technology Laboratory
- Institute of Process Engineering
- Department of Mechanical and Process Engineering
- ETH Zurich
- Zurich 8092, Switzerland
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321
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Yoshida Y, Uto K, Hattori M, Tsuji M. Synthesis and growth mechanism of Au@Cu core–shell nanorods having excellent antioxidative properties. CrystEngComm 2014. [DOI: 10.1039/c4ce00672k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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322
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Li H, Wang M, Qiang W, Hu H, Li W, Xu D. Metal-enhanced fluorescent detection for protein microarrays based on a silver plasmonic substrate. Analyst 2014; 139:1653-60. [DOI: 10.1039/c3an01875j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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323
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Amendola V, Scaramuzza S, Agnoli S, Polizzi S, Meneghetti M. Strong dependence of surface plasmon resonance and surface enhanced Raman scattering on the composition of Au-Fe nanoalloys. NANOSCALE 2014; 6:1423-33. [PMID: 24309909 DOI: 10.1039/c3nr04995g] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanoalloys of noble metals with transition metals are crucial components for the integration of plasmonics with magnetic and catalytic properties, as well as for the production of low-cost photonic devices. However, due to synthetic challenges in the realization of nanoscale solid solutions of noble metals and transition metals, very little is known about the composition dependence of plasmonic response in nanoalloys. Here we demonstrate for the first time that the elemental composition of Au-Fe nanoalloys obtained by laser ablation in liquid solution can be tuned by varying the liquid environment. Due to surface passivation and reaction with thiolated ligands, the nanoalloys obtained by our synthetic protocol are structurally and colloidally stable. Hence, we studied the dependence of the surface plasmon resonance (SPR) on the iron fraction and, for the first time, we observed surface enhanced Raman scattering (SERS) in Au-Fe nanoalloys. SPR and SERS performances are strongly affected by the iron content and are investigated using analytical and numerical models. By demonstrating the strong modification of plasmonic properties on the composition, our results provide important insights into the exploitation of Au-Fe nanoalloys in photonics, nanomedicine, magneto-plasmonic and plasmon-enhanced catalysis. Moreover, our findings show that several other plasmonic materials exist beyond gold and silver nanostructures.
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Affiliation(s)
- Vincenzo Amendola
- Department of Chemical Sciences, University of Padova, via Marzolo 1, I-35131 Padova, Italy.
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324
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Luque D, Escosura ADL, Snijder J, Brasch M, Burnley RJ, Koay MST, Carrascosa JL, Wuite GJL, Roos WH, Heck AJR, Cornelissen JJLM, Torres T, Castón JR. Self-assembly and characterization of small and monodisperse dye nanospheres in a protein cage. Chem Sci 2014. [DOI: 10.1039/c3sc52276h] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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325
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Pramanik S, Mishra MK, De G. Crystal structure tailoring of Au–Cu alloy NPs using the embedding film matrix as template. CrystEngComm 2014. [DOI: 10.1039/c3ce41342j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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326
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Holden MS, Nick KE, Hall M, Milligan JR, Chen Q, Perry CC. Synthesis and Catalytic Activity of Pluronic Stabilized Silver-Gold Bimetallic Nanoparticles. RSC Adv 2014; 4:52279-52288. [PMID: 25580244 PMCID: PMC4286189 DOI: 10.1039/c4ra07581a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In this report, we demonstrate a rapid, simple, and green method for synthesizing silver-gold (Ag-Au) bimetallic nanoparticles (BNPs). We used a novel modification to the galvanic replacement reaction by suspending maltose coated silver nanoparticles (NPs) in ≈ 2% aqueous solution of EO100PO65EO100 (Pluronic F127) prior to HAuCl4 addition. The Pluronic F127 stabilizes the BNPs, imparts biocompatibility, and mitigates the toxicity issues associated with other surfactant stabilizers. BNPs with higher Au:Ag ratios and, subsequently, different morphologies were successfully synthesized by increasing the concentration of gold salt added to the Ag NP seeds. These BNPs have enhanced catalytic activities than typically reported for monometallic Au or Ag NPs (∼ 2-10 fold) of comparable sizes in the sodium borohydride reduction of 4-nitrophenol. The 4-nitrophenol reduction rates were highest for partially hollow BNP morphologies.
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Affiliation(s)
- Megan S. Holden
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350
| | - Kevin E. Nick
- Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350
| | - Mia Hall
- Elizabeth City State University, 1704 Weeksville Rd, Elizabeth City, NC 27909
| | - Jamie R. Milligan
- Department of Radiology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Qiao Chen
- Chemistry Department, School of Life Sciences, Sussex University, Brighton, BN1 9QJ, UK
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327
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Liu Y, Huang CZ. Real-time dark-field scattering microscopic monitoring of the in situ growth of single Ag@Hg nanoalloys. ACS NANO 2013; 7:11026-11034. [PMID: 24279755 DOI: 10.1021/nn404694e] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A comprehensive understanding of the growth mechanism of nanoalloys is beneficial in designing and synthesizing nanoalloys with precisely tailored properties to extend their applications. Herein, we present the investigation in this aspect by real-time monitoring of the in situ growth of single Ag@Hg nanoalloys, through direct amalgamation of Ag nanoparticles with elemental mercury, by dark-field scattering microscopy. Four typically shaped Ag nanoparticles, such as rods, triangular bipyramids, cubes, and spheres, were used as seeds for studying the growth of Ag@Hg nanoalloys. The scattered light of Ag nanoparticles of different shapes, on exposure to the growth solution, exhibited a noticeable blue-shift followed by a red-shift, suggesting the growth of Ag@Hg nanoalloys. The formation of Ag@Hg nanoalloys was confirmed by scanning electron microscopy, high-resolution transmit electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and elemental mapping and line scanning. Further analysis of the time-dependent spectral data and morphological change of single nanoparticles during the growth led to the visual identification of the growth mechanism of single Ag@Hg nanoalloys. Three important steps were involved: first, rapid adsorption of Hg atoms onto Ag nanoparticles; second, initial diffusion of Hg atoms into Ag nanoparticles, rounding or shortening the particles; third, further diffusion of Hg atoms leading to the formation of spherical Ag@Hg nanoalloys. On the basis of these results, Ag@Hg nanoalloys with given optical properties can be synthesized. Moreover, dark-field scattering microscopy is expected to be a powerful tool used for real-time monitoring of the in situ growth of other metal nanoparticles.
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Affiliation(s)
- Yue Liu
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, China
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328
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Zhang C, Song C, Fry HC, Rosi NL. Peptide Conjugates for Directing the Morphology and Assembly of 1D Nanoparticle Superstructures. Chemistry 2013; 20:941-5. [DOI: 10.1002/chem.201304074] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Indexed: 01/28/2023]
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329
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Gavia DJ, Maung MS, Shon YS. Water-soluble Pd nanoparticles synthesized from ω-carboxyl-S-alkanethiosulfate ligand precursors as unimolecular micelle catalysts. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12432-40. [PMID: 24246150 PMCID: PMC4072038 DOI: 10.1021/am4035043] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This report describes a two-phase synthesis of water-soluble carboxylate-functionalized alkanethiolate-capped Pd nanoparticles from ω-carboxyl-S-alkanethiosulfate sodium salts. The two-phase methodology using the thiosulfate ligand passivation protocol allowed a highly specific control over the surface ligand coverage of these nanoparticles, which are lost in a one-phase aqueous system because of the base-catalyzed hydrolysis of thiosulfate to thiolate. Systematic synthetic variations investigated in this study included the concentration of ω-carboxyl-S-alkanethiosulfate ligand precursors and reducing agent, NaBH4, and the overall ligand chain length. The resulting water-soluble Pd nanoparticles were isolated and characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), (1)H NMR, UV-vis, and FT-IR spectroscopy. Among different variations, a decrease in the molar equivalent of NaBH4 resulted in a reduction in the surface ligand density while maintaining a similar particle core size. Additionally, reducing the chain length of the thiosulfate ligand precursor also led to the formation of stable nanoparticles with a lower surface coverage. Since the metal core size of these Pd nanoparticle variations remained quite consistent, direct correlation studies between ligand properties and catalytic activities against hydrogenation/isomerization of allyl alcohol could be performed. Briefly, Pd nanoparticles dissolved in water favored the hydrogenation of allyl alcohol to 1-propanol whereas Pd nanoparticles heterogeneously dispersed in chloroform exhibited a rather high selectivity towards the isomerization product (propanal). The results suggested that the surrounding ligand environments, such as the ligand structure, conformation, and surface coverage, were crucial in determining the overall activity and selectivity of the Pd nanoparticle catalysts.
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Affiliation(s)
| | | | - Young-Seok Shon
- Corresponding Author: . Tel: 562-985-4466. Fax: 562-985-8547
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330
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Changez M, Kang NG, Kim DW, Lee JS. Hollow flower micelles from a diblock copolymer. NANOSCALE 2013; 5:11554-11560. [PMID: 23982427 DOI: 10.1039/c3nr03063f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A poly(2-vinylpyridine)-block-poly(2-(4-vinylphenyl)pyridine) (P2VP106-b-PVPPy95) coil-coil diblock copolymer forms hollow flower micelles in a mixed solvent of methanol and water (95/5, v/v) in a one step process. The geometry and composition of the micelles allow formation of a Pt-Au bimetallic dendritic nanocatalyst with a Pt leaf at room temperature.
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Affiliation(s)
- Mohammad Changez
- Department of Nanobio Materials and Electronics, School of Materials Science and Engineering Gwangju Institute of Science and Technology, 123 Chemdan-gwagiro, Buk-gu, Gwangju, 500-712, Korea.
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331
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Lee JP, Chen D, Li X, Yoo S, Bottomley LA, El-Sayed MA, Park S, Liu M. Well-organized raspberry-like Ag@Cu bimetal nanoparticles for highly reliable and reproducible surface-enhanced Raman scattering. NANOSCALE 2013; 5:11620-11624. [PMID: 24126702 DOI: 10.1039/c3nr03363e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is ideally suited for probing and mapping surface species and incipient phases on fuel cell electrodes because of its high sensitivity and surface-selectivity, potentially offering insights into the mechanisms of chemical and energy transformation processes. In particular, bimetal nanostructures of coinage metals (Au, Ag, and Cu) have attracted much attention as SERS-active agents due to their distinctive electromagnetic field enhancements originated from surface plasmon resonance. Here we report excellent SERS-active, raspberry-like nanostructures composed of a silver (Ag) nanoparticle core decorated with smaller copper (Cu) nanoparticles, which displayed enhanced and broadened UV-Vis absorption spectra. These unique Ag@Cu raspberry nanostructures enable us to use blue, green, and red light as the excitation laser source for surface-enhanced Raman spectroscopy (SERS) with a large enhancement factor (EF). A highly reliable SERS effect was demonstrated using Rhodamine 6G (R6G) molecules and a thin film of gadolinium doped ceria.
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Affiliation(s)
- Jung-Pil Lee
- School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, USA.
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332
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Han SK, Gu C, Gong M, Wang ZM, Yu SH. Colloidal synthesis of ternary AgFeS2 nanocrystals and their transformation to Ag2S-Fe7S8 heterodimers. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:3765-3769. [PMID: 23650281 DOI: 10.1002/smll.201300268] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 04/03/2013] [Indexed: 06/02/2023]
Abstract
Ternary-/hetero-nanocrystals: a facile one-pot colloidal route for controlled synthesis of ternary AgFeS2 nanocrystals, which have a band gap of 1.21 eV, is presented for the first time. Such ternary AgFeS2 nanocrystals can transform to Ag2 S-Fe7 S8 heterodimers by internal thermal reaction at elevated temperature, providing a new route to synthesize semiconductor hetero-nanostructures.
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Affiliation(s)
- Shi-Kui Han
- Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Lab of Mechanical and Material Science, School of Engineering Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China, Fax: +86 551 63603040
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333
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Estevez MC, Otte MA, Sepulveda B, Lechuga LM. Trends and challenges of refractometric nanoplasmonic biosensors: a review. Anal Chim Acta 2013; 806:55-73. [PMID: 24331040 DOI: 10.1016/j.aca.2013.10.048] [Citation(s) in RCA: 139] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 10/22/2013] [Accepted: 10/27/2013] [Indexed: 01/28/2023]
Abstract
Motivated by potential benefits such as sensor miniaturization, multiplexing opportunities and higher sensitivities, refractometric nanoplasmonic biosensing has profiled itself in a short time span as an interesting alternative to conventional Surface Plasmon Resonance (SPR) biosensors. This latter conventional sensing concept has been subjected during the last decades to strong commercialization, thereby strongly leaning on well-developed thin-film surface chemistry protocols. Not surprisingly, the examples found in literature based on this sensing concept are generally characterized by extensive analytical studies of relevant clinical and diagnostic problems. In contrast, the more novel Localized Surface Plasmon Resonance (LSPR) alternative finds itself in a much earlier, and especially, more fundamental stage of development. Driven by new fabrication methodologies to create nanostructured substrates, published work typically focuses on the novelty of the presented material, its optical properties and its use - generally limited to a proof-of-concept - as a label-free biosensing scheme. Given the different stages of development both SPR and LSPR sensors find themselves in, it becomes apparent that providing a comparative analysis of both concepts is not a trivial task. Nevertheless, in this review we make an effort to provide an overview that illustrates the progress booked in both fields during the last five years. First, we discuss the most relevant advances in SPR biosensing, including interesting analytical applications, together with different strategies that assure improvements in performance, throughput and/or integration. Subsequently, the remaining part of this work focuses on the use of nanoplasmonic sensors for real label-free biosensing applications. First, we discuss the motivation that serves as a driving force behind this research topic, together with a brief summary that comprises the main fabrication methodologies used in this field. Next, the sensing performance of LSPR sensors is examined by analyzing different parameters that can be invoked in order to quantitatively assess their overall sensing performance. Two aspects are highlighted that turn out to be especially important when trying to maximize their sensing performance, being (1) the targeted functionalization of the electromagnetic hotspots of the nanostructures, and (2) overcoming inherent negative influence that stem from the presence of a high refractive index substrate that supports the nanostructures. Next, although few in numbers, an overview is given of the most exhaustive and diagnostically relevant LSPR sensing assays that have been recently reported in literature, followed by examples that exploit inherent LSPR characteristics in order to create highly integrated and high-throughput optical biosensors. Finally, we discuss a series of considerations that, in our opinion, should be addressed in order to bring the realization of a stand-alone LSPR biosensor with competitive levels of sensitivity, robustness and integration (when compared to a conventional SPR sensor) much closer to reality.
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Affiliation(s)
- M-Carmen Estevez
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC & CIBER-BBN, ICN2 Building Campus UAB, 08193 Bellaterra, Barcelona, Spain.
| | - Marinus A Otte
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC & CIBER-BBN, ICN2 Building Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - Borja Sepulveda
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC & CIBER-BBN, ICN2 Building Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - Laura M Lechuga
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC & CIBER-BBN, ICN2 Building Campus UAB, 08193 Bellaterra, Barcelona, Spain
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334
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Zhou J, Huang F, Xu J, Wang Y. Controllable synthesis of metal selenide heterostructures mediated by Ag2Se nanocrystals acting as catalysts. NANOSCALE 2013; 5:9714-9719. [PMID: 24056899 DOI: 10.1039/c3nr03601d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ag2Se nanocrystals were demonstrated to be novel semiconductor mediators, or in other word catalysts, for the growth of semiconductor heterostructures in solution. This is a result of the unique feature of Ag2Se as a fast ion conductor, allowing foreign cations to dissolve and then to heterogrow the second phase. Using Ag2Se nanocrystals as catalysts, dimeric metal selenide heterostructures such as Ag2Se-CdSe and Ag2Se-ZnSe, and even multi-segment heterostructures such as Ag2Se-CdSe-ZnSe and Ag2Se-ZnSe-CdSe, were successfully synthesized. Several interesting features were found in the Ag2Se based heterogrowth. At the initial stage of heterogrowth, a layer of the second phase forms on the surface of an Ag2Se nanosphere, with a curved junction interface between the two phases. With further growth of the second phase, the Ag2Se nanosphere tends to flatten the junction surface by modifying its shape from sphere to hemisphere in order to minimize the conjunct area and thus the interfacial energy. Notably, the crystallographic relationship of the two phases in the heterostructure varies with the lattice parameters of the second phase, in order to reduce the lattice mismatch at the interface. Furthermore, a small lattice mismatch at the interface results in a straight rod-like second phase, while a large lattice mismatch would induce a tortuous product. The reported results may provide a new route for developing novel selenide semiconductor heterostructures which are potentially applicable in optoelectronic, biomedical, photovoltaic and catalytic fields.
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Affiliation(s)
- Jiangcong Zhou
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
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335
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Zhu J, Wu J, Liu F, Xing R, Zhang C, Yang C, Yin H, Hou Y. Controlled synthesis of FePt-Au hybrid nanoparticles triggered by reaction atmosphere and FePt seeds. NANOSCALE 2013; 5:9141-9149. [PMID: 23913136 DOI: 10.1039/c3nr02911e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report an effective and facile method for synthesis of FePt-Au hybrid nanoparticles (HNPs). The typical secondary growth of Au proceeded in the presence of FePt seeds in organic solvents under a specific atmosphere. Interestingly, the type of atmosphere (Ar or Ar-H₂) and the size of selected FePt seeds were two major parameters determining the final morphology of FePt-Au HNPs. Enhancement of catalytic activity and stability of FePt-Au HNPs in methanol oxidation were achieved owing to interactions between Au and FePt. The optical properties of the resulting products can be steadily tuned which sheds light on their potential application in optical devices and bioimaging. The novel synthetic strategy offers an important tool towards multifunctional nanomaterials with designed architectures.
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Affiliation(s)
- Jinghan Zhu
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
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336
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Bonini M, Berti D, Baglioni P. Nanostructures for magnetically triggered release of drugs and biomolecules. Curr Opin Colloid Interface Sci 2013. [DOI: 10.1016/j.cocis.2013.07.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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337
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Kang SW, Lee YW, Park Y, Choi BS, Hong JW, Park KH, Han SW. One-pot synthesis of trimetallic Au@PdPt core-shell nanoparticles with high catalytic performance. ACS NANO 2013; 7:7945-7955. [PMID: 23915173 DOI: 10.1021/nn403027j] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The development of an efficient synthesis method to produce multimetallic nanoparticles (NPs) with a desirable structure is strongly required to clarify the structure-composition-property relationship of NPs and to investigate their possible applications. However, the controlled synthesis of NPs consisting of multiple (n ≥ 3) noble metal components has been relatively unexplored in comparison to bimetallic NPs. In the present work, we have demonstrated a facile one-pot aqueous approach for the controlled synthesis of trimetallic Au@PdPt core-shell NPs with a well-defined octahedral Au core and a highly crystalline dendritic Pd-Pt alloy shell (Auoct@PdPt NPs). The simultaneous reduction of multiple metal precursors with dual reducing agents, namely, ascorbic acid and hydrazine, gave a fine control over the nucleation and growth kinetics of NPs, resulting in the formation of novel Auoct@PdPt NPs. The prepared NPs showed excellent catalytic performance for methanol electrooxidation, which can be attributed to their optimized binding strength toward adsorbate molecules due to the improved charge transfer between core and shell of the NPs. The present strategy can offer a convenient and valuable way to fabricate multicomponent nanostructures with desired structures and functions.
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Affiliation(s)
- Shin Wook Kang
- Department of Chemistry and KI for the NanoCentury, KAIST , Daejeon 305-701, Korea, and Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea
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338
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Ferrara DW, Nag J, MacQuarrie ER, Kaye AB, Haglund RF. Plasmonic probe of the semiconductor to metal phase transition in vanadium dioxide. NANO LETTERS 2013; 13:4169-4175. [PMID: 23915007 DOI: 10.1021/nl401823r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An array of 180 nm diameter gold nanoparticles (NPs) embedded in a thin vanadium dioxide film was used as a nanoscale probe of the thermochromic semiconductor-to-metal transition (SMT) in the VO2. The observed 30% reduction in plasmon dephasing time resulted from the interaction between the localized surface plasmon resonance of the NPs with the 1.4 eV electronic transitions in VO2. The NPs act as nanoantennas probing the SMT; homogeneous broadening of the gold plasmon resonance is observed at the temperatures where electron correlations are strongest in VO2.
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Affiliation(s)
- Davon W Ferrara
- Department of Chemistry and Physics, Belmont University , 1900 Belmont Boulevard, Nashville, Tennessee 37212-3757, United States
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339
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Goris B, De Backer A, Van Aert S, Gómez-Graña S, Liz-Marzán LM, Van Tendeloo G, Bals S. Three-dimensional elemental mapping at the atomic scale in bimetallic nanocrystals. NANO LETTERS 2013; 13:4236-41. [PMID: 23952010 DOI: 10.1021/nl401945b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A thorough understanding of the three-dimensional (3D) atomic structure and composition of core-shell nanostructures is indispensable to obtain a deeper insight on their physical behavior. Such 3D information can be reconstructed from two-dimensional (2D) projection images using electron tomography. Recently, different electron tomography techniques have enabled the 3D characterization of a variety of nanostructures down to the atomic level. However, these methods have all focused on the investigation of nanomaterials containing only one type of chemical element. Here, we combine statistical parameter estimation theory with compressive sensing based tomography to determine the positions and atom type of each atom in heteronanostructures. The approach is applied here to investigate the interface in core-shell Au@Ag nanorods but it is of great interest in the investigation of a broad range of nanostructures.
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Affiliation(s)
- Bart Goris
- Electron Microscopy for Materials Research (EMAT), University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium
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340
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Wang L, Mei S, Jin Z. The Influences of Cooperative Swelling and Coordination on Patterned Decoration of Gold on Block Copolymer Nanospheres. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300481] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lu Wang
- Department of Chemistry; Renmin University of China; Beijing 100872 P. R. China
| | - Shilin Mei
- Department of Chemistry; Renmin University of China; Beijing 100872 P. R. China
| | - Zhaoxia Jin
- Department of Chemistry; Renmin University of China; Beijing 100872 P. R. China
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341
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Chantry RL, Atanasov I, Siriwatcharapiboon W, Khanal BP, Zubarev ER, Horswell SL, Johnston RL, Li ZY. An atomistic view of the interfacial structures of AuRh and AuPd nanorods. NANOSCALE 2013; 5:7452-7457. [PMID: 23832276 DOI: 10.1039/c3nr02560h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this work we address the challenge of furthering our understanding of the driving forces responsible for the metal-metal interactions in industrially relevant bimetallic nanocatalysts, by taking a comparative approach to the atomic scale characterization of two core-shell nanorod systems (AuPd and AuRh). Using aberration-corrected scanning transmission electron microscopy, we show the existence of a randomly mixed alloy layer some 4-5 atomic layers thick between completely bulk immiscible Au and Rh, which facilitates fully epitaxial overgrowth for the first few atomic layers. In marked contrast in AuPd nanorods, we find atomically sharp segregation resulting in a quasi-epitaxial, strained interface between bulk miscible metals. By comparing the two systems, including molecular dynamics simulations, we are able to gain insights into the factors that may have influenced their structure and chemical ordering, which cannot be explained by the key structural and energetic parameters of either system in isolation, thus demonstrating the advantage of taking a comparative approach to the characterization of complex binary systems. This work highlights the importance of achieving a fundamental understanding of reaction kinetics in realizing the atomically controlled synthesis of bimetallic nanocatalysts.
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Affiliation(s)
- Ruth L Chantry
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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342
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Hou S, Hu X, Wen T, Liu W, Wu X. Core-shell noble metal nanostructures templated by gold nanorods. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:3857-3862. [PMID: 24048971 DOI: 10.1002/adma.201301169] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 04/17/2013] [Indexed: 06/02/2023]
Abstract
The main research progress in core-shell noble metal nanostructures templated by gold nanorods (Au NRs) is summarized regarding synthesis, optical, and catalytic properties. Design and fabrication of core-shell hybrid nanostructures are demonstrated to be effective not only for optimizing and expanding intrinsic properties but also for creating novel localized surface plasmon enhanced optical and catalytic functionalities, thus providing great prospects in both fundamental research and potential applications.
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Affiliation(s)
- Shuai Hou
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, 11 Beiyitiao, ZhongGuanCun, Beijing 100190, China
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343
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Hu T, Lin Y, Yan J, Di J. Synthesis of hollow gold nanoparticles on the surface of indium tin oxide glass and their application for plasmonic biosensor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 110:72-77. [PMID: 23557775 DOI: 10.1016/j.saa.2013.03.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 02/14/2013] [Accepted: 03/03/2013] [Indexed: 06/02/2023]
Abstract
Hollow gold nanoparticles (HGNs) deposited on the surface of transparent indium tin oxide (ITO) glass have been synthesized. The silver nanoparticles were firstly electrodeposited directly on the ITO surface as a template without any organic ligands or surfactants. Then these silver nanoparticles were taken as sacrificial templates and the HGNs were obtained by Galvanic replacement reaction between HAuCl4 solution and silver nanoparticles. The localized surface plasmon resonance (LSPR) peak of HGNs was located at near infrared region of ~800 nm, which was largely red-shifted as compared to silver nanoparticles as a template. Moreover, the refractive index sensitivity of HGNs was enhanced to 277 nm per refractive index unit, which was also much higher than that of silver nanoparticles deposited on ITO substrate. The "clean" surface of HGNs could be further functionalized by special biomolecules and applied to fabrication of LSPR biosensors. This approach provides a potential opportunity as LSPR biosensors for chemical or biological analysis especially on tissue and blood samples.
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Affiliation(s)
- Tingting Hu
- The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou, Jiangsu 215123, PR China
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344
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Cheng LC, Jiang X, Wang J, Chen C, Liu RS. Nano-bio effects: interaction of nanomaterials with cells. NANOSCALE 2013; 5:3547-69. [PMID: 23532468 DOI: 10.1039/c3nr34276j] [Citation(s) in RCA: 158] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
With the advancements in nanotechnology, studies on the synthesis, modification, application, and toxicology evaluation of nanomaterials are gaining increased attention. In particular, the applications of nanomaterials in biological systems are attracting considerable interest because of their unique, tunable, and versatile physicochemical properties. Artificially engineered nanomaterials can be well controlled for appropriate usage, and the tuned physicochemical properties directly influence the interactions between nanomaterials and cells. This review summarizes recently synthesized major nanomaterials that have potential biomedical applications. Focus is given on the interactions, including cellular uptake, intracellular trafficking, and toxic response, while changing the physicochemical properties of versatile materials. The importance of physicochemical properties such as the size, shape, and surface modifications of the nanomaterials in their biological effects is also highlighted in detail. The challenges of recent studies and future prospects are presented as well. This review benefits relatively new researchers in this area and gives them a systematic overview of nano-bio interaction, hopefully for further experimental design.
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Affiliation(s)
- Liang-Chien Cheng
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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345
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Macfarlane RJ, O'Brien MN, Petrosko SH, Mirkin CA. Nucleinsäuremodifizierte Nanostrukturen als programmierbare Atomäquivalente: Entwicklung eines neuen “Systems der Elemente”. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209336] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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346
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Macfarlane RJ, O'Brien MN, Petrosko SH, Mirkin CA. Nucleic acid-modified nanostructures as programmable atom equivalents: forging a new "table of elements". Angew Chem Int Ed Engl 2013; 52:5688-98. [PMID: 23640804 DOI: 10.1002/anie.201209336] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 01/24/2013] [Indexed: 12/29/2022]
Affiliation(s)
- Robert J Macfarlane
- Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
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347
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Hu B, Cao X, Zhang P. Dual Control of Interparticle Forces in Assembly of Gold Nanoparticles. Chempluschem 2013. [DOI: 10.1002/cplu.201300091] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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348
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Programmed self-assembly of DNA origami nanoblocks into anisotropic higher-order nanopatterns. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s11434-012-5530-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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349
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Stender AS, Marchuk K, Liu C, Sander S, Meyer MW, Smith EA, Neupane B, Wang G, Li J, Cheng JX, Huang B, Fang N. Single cell optical imaging and spectroscopy. Chem Rev 2013; 113:2469-527. [PMID: 23410134 PMCID: PMC3624028 DOI: 10.1021/cr300336e] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Anthony S. Stender
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Kyle Marchuk
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Chang Liu
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Suzanne Sander
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Matthew W. Meyer
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Emily A. Smith
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Bhanu Neupane
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Gufeng Wang
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Junjie Li
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907
| | - Bo Huang
- Department of Pharmaceutical Chemistry and Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158
| | - Ning Fang
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
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350
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Dong P, Lin Y, Deng J, Di J. Ultrathin gold-shell coated silver nanoparticles onto a glass platform for improvement of plasmonic sensors. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2392-2399. [PMID: 23477284 DOI: 10.1021/am4004254] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A facile and effective approach for the improvement of localized surface plasmon resonance (LSPR) biosensors based on silver-core and gold-shell nanoparticles (Ag@AuNPs) on a glass substrate was investigated. Silver nanoparticles (core) with thin gold shells on a transparent indium tin oxide (ITO) coated glass surface were prepared by sequential electrodeposition, and the influence of the thickness of the gold shell was systematically investigated. The experimental results indicate that the properties of an LSPR band of ultrathin (∼1.3 nm) gold-shell coated silver nanoparticles are very similar to those of silver nanoparticles alone. The refractive index (RI) sensitivities of the metal nanostructures are calculated as 123 and 220 nm/RIU for the silver cores (∼480 nm of LSPR peak) and Ag@AuNPs (∼503 nm of LSPR peak), respectively, on the ITO substrate. The RI sensitivity of Ag@AuNPs was significantly enhanced by coating the silver nanoparticles with an ultrathin gold shell. This core-shell platform was also applied to the fabrication of biosensors. Thus, this strategy can be used to construct inexpensive, stable, versatile, and sensitive LSPR biosensors.
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Affiliation(s)
- Peipei Dong
- College of Chemistry, Chemical Engineering and Material Science, Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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