Controlling the Synthesis and Assembly of Silver Nanostructures for Plasmonic Applications

Rycenga, Matthew; Cobley, Claire M.; Zeng, Jie; Li, Weiyang; Moran, Charles P.; Zhang, Qiang; Qin, Dong; Xia, Younan

doi:10.1021/cr100275d

Cited by 2,488 publications

(2,216 citation statements)

References 527 publications

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“…It is reported that the sphere particles benet the formation of SOR; 12 moreover, it is generally believed that silver nanomaterials show higher SERS activity than the gold nanomaterials, 27 and the size and morphology of AgNPs signicantly inuence the SERS activity. [28][29][30] Therefore, PVA-capped sphere AgNPs with different sizes (20,40, and 60 nm, see Fig. S2 †) were prepared according to previously reported methods 23,31,32 with slight modication, and used for the detection of As(V) and MG, respectively.…”

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confidence: 99%

Coffee-ring effect-based simultaneous SERS substrate fabrication and analyte enrichment for trace analysis

et al. 2014

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Based on the "coffee-ring effect", we developed a highly efficient SERS platform which integrates the fabrication of SERS-active substrates and the preconcentration of analytes into one step. The high sensitivity, robustness, reproducibility and simplicity make this platform ideal for on-site analysis of small volume samples at low concentrations in complex matrices.Since its invention in the 1970s, 1,2 surface-enhanced Raman spectroscopy (SERS) has been receiving growing interest in a variety of areas due to its inherent merits such as a high signalto-noise ratio, non-photobleaching features and the use of single photoexcitation. 3 These features make SERS one of the most powerful techniques for non-destructive, on-site and in vivo analysis of chemical and biological substances. 4 However, the utilization of SERS in determination of trace analytes is restricted by the sophisticated and expensive nanofabrication of highly SERS-active substrates, as well as its limited sensitivity and selectivity for trace substances in complex matrices due to the swamping of the analyte signal in background molecule signals. For example, while the concentrations of PAHs in the environment are commonly in the range of 10 À12 to 10 À9 g L À1 , the lowest detection limits available with a well-designed SERS substrate are in the range of 3 Â 10 À6 to 1.78 Â 10 À4 g L À1 . 5 To meet the requirements for analysis of trace analytes in complex matrices, metallic substrates were tailored to increase the signal strength, and analytes were preconcentrated before SERS analysis. As these two approaches are very complicated and timeconsuming, it is highly desired to develop a fast, simple and robust approach to simultaneously perform the self-assembling of SERS substrates and preconcentration of trace analytes.One technique that holds great promise in this regard is the "coffee-ring effect", which refers to the accumulation of a ringlike dense array on the border by evaporating a droplet of aqueous solution containing nonvolatile solutes such as organic small molecules, biomacromolecules, polymers, and nanoparticle microspheres on solid surfaces. In this process, the three-phase contact line among the atmosphere, droplet and solid substrate is pinned, and a remarkable capillary ow happens because of the evaporation of solvents, driving solutes to move outward from the inner side to the rim of the droplet. Consequently, solutes are highly concentrated along the original droplet edge. It was found that the coffee-ring effect is applicable for enriching both chemical and biological substances. 6-11 One example is its application in normal Raman spectrometry that is termed as drop coating deposition Raman (DCDR). 10 In recent years, the coffee-ring effect has become a powerful tool for self-structuring of nanomaterials. [12][13][14][15] Herein, we report the development of a novel SERS platform by integrating the generation of SERS substrates and the enrichment of analytes into one step. We demonstrate the benets of the coffee-ring effect in co...

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confidence: 99%

Coffee-ring effect-based simultaneous SERS substrate fabrication and analyte enrichment for trace analysis

et al. 2014

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“…Sodium and Potassium have higher quality factorsbut they are so volatile that they cannot be practically used by themselves (imagine if Potassium came into contact with water -then consider that a lot of the biospecies that have to be analysed using LSPR may be in aqueous solution.). Silver, for example has a higher Q than Au, however it is toxic -so therefore not appropriate for some bio-related applications [80]. Clearly there are a lot of factors to consider -having the best performing material is not always the way to go, it is more like having the best fit material for a number of considerations both performance (high quality factor) and practicality (ease of fabrication, excitation in the visible range of the EM spectrum, i.e., white light), in other words -the choice of material is a balancing act.…”

Section: Materials Design For Surface Plasmonsmentioning

confidence: 99%

“…For smaller nanostructures (radius <∼ 30 nm), absorption dominates LSPR extinction, whereas scattering dominates for larger nanostructures (radius >∼ 30 nm) [80] -consider equations (16) and (17) (this is one of the reasons that larger Ag nanostructures are promising for plasmon enhanced solar cells (and LEDs) -the scattering is enhanced leading to an enhancement in the solar cell efficiency [88][89][90]). Regarding shape [91,92] -it is documented that there is higher refractive index sensitivity for higher aspect ratios i.e., 157-497 nm/RIU from aspect ratio of 1.0 (sphere) to 3.4 (nanorods, described by spheroidal model) [72], where RIU is refractive index unit.…”

Section: Materials Design For Surface Plasmonsmentioning

confidence: 99%

“…This may also be linked to hot spot enhancements around the tips of nanostructures due to the so-called "lightning rod effect" [11]. For the cases where nanostructures are non-spherical, the number of resonances increases as the facets increase, e.g., a cube has more plasmon resonances than a triangle, which has more than a sphere [80]. In other words, if the structure is 'anisotropic' it can support multiple plasmon modes, the number of which depends on the number of ways the shape can be polarised [78,80].…”

Section: Materials Design For Surface Plasmonsmentioning

confidence: 99%

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Plasmas meet plasmonics

2012

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Abstract. The term 'plasmon' was first coined in 1956 to describe collective electronic oscillations in solids which were very similar to electronic oscillations/surface waves in a plasma discharge (effectively the same formulae can be used to describe the frequencies of these physical phenomena). Surface waves originating in a plasma were initially considered to be just a tool for basic research, until they were successfully used for the generation of large-area plasmas for nanoscale materials synthesis and processing. To demonstrate the synergies between 'plasmons' and 'plasmas', these large-area plasmas can be used to make plasmonic nanostructures which functionally enhance a range of emerging devices. The incorporation of plasmafabricated metal-based nanostructures into plasmonic devices is the missing link needed to bridge not only surface waves from traditional plasma physics and surface plasmons from optics, but also, more topically, macroscopic gaseous and nanoscale metal plasmas. This article first presents a brief review of surface waves and surface plasmons, then describe how these areas of research may be linked through Plasma Nanoscience showing, by closely looking at the essential physics as well as current and future applications, how everything old, is new, once again.

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“…Its worthy to note reviews devoted to the problems of nanocrystals' formation from metal nanoparticles [1,2], as well as from semiconducting and diectric materials [3][4][5][6]. The interest to the self-organization of nanoparticles into complex structures is common for these studies, the mechanisms of the former being actively studied [7 ,8].…”

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confidence: 99%

Laser-induced Interaction of Multilevel Quantum Dots

Glushkov¹,

Slyusareva²,

Aleksandrovsky³

et al. 2017

J. Sib. Fed. Univ., Math. phys.

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A theoretical model is developed for describing the laser-induced interaction of a pair of multilevel semiconductor quantum dots. Spectral dependencies of interaction energy are calculated in dipole-dipole approximation for a pair of CdSe quantum dots in a quasi-resonant laser field, for cases of two identical quantum dots and those with differing transition wavelengths. Interaction energy of pair of multilevel quantum dots in the long-wavelength potential well is much higher than that of pair of two-level quantum dots. The increase of difference of resonance wavelengths of two interacting quantum dots leads to decrease of the potential well depth.

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Controlling the Synthesis and Assembly of Silver Nanostructures for Plasmonic Applications

Cited by 2,488 publications

References 527 publications

Coffee-ring effect-based simultaneous SERS substrate fabrication and analyte enrichment for trace analysis

Coffee-ring effect-based simultaneous SERS substrate fabrication and analyte enrichment for trace analysis

Plasmas meet plasmonics

Laser-induced Interaction of Multilevel Quantum Dots

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