Formation of Silver Nanoprisms with Surface Plasmons at Communication Wavelengths

Bastys, Vytautas; Pastoriza‐Santos, Isabel; Rodríguez‐González, Benito; Vaišnoras, R.; Liz‐Marzán, Luis M.

doi:10.1002/adfm.200500667

Cited by 246 publications

(230 citation statements)

References 39 publications

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“…24 Bastys et al noted the presence of an isosbestic point in the time-resolved UV/vis absorption spectra of the photoconversion, thus ruling out an Ostwald ripening mechanism. 45 At room temperature and in the dark, the particle solutions are stabile because of the capping action of citrate. When formed in the absence of citrate, such borohydridereduced particles quickly aggregate.…”

Section: ∆V )mentioning

confidence: 99%

Photovoltage and Photocatalyzed Growth in Citrate-Stabilized Colloidal Silver Nanocrystals

2007

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The photocatalyzed reduction of aqueous silver ions, by citrate adsorbed on silver nanocrystals, is studied on Formvar/carbon TEM grids and in photoelectrochemical cells. The reaction is characterized by transmission electron microscopy (TEM) monitoring of individual particles throughout the growth process. The photoinitiated growth on the silver particles is uniform and is not dependent upon the laser polarization. The potential of silver particle working electrodes is shown to shift negatively under irradiation in solutions of citrate. Adding silver ions to this system quenches the charging of the particle working electrode through charge transfer to the silver ions. The reaction is hypothesized to result from photoelectron transfer from adsorbed citrate to the silver nanoparticle. Nanocrystal growth occurs when this "stored" charge reduces silver ions in solution. Comments are offered on the photo-reformulation of colloidal nanocrystals into prisms reported in the literature.

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Section: ∆V )mentioning

confidence: 99%

Photovoltage and Photocatalyzed Growth in Citrate-Stabilized Colloidal Silver Nanocrystals

2007

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“…Since then, a plethora of studies have dealt with the production and characterization of noble metal colloids in a wide range of sizes [2][3][4], and for a variety of applications, including catalysis [5], biolabelling [6], biosensing [7], optical switches [8], among others. Only recently, variations in nanoparticle shape have been recognized as having a strong impact on their properties, which has motivated the development of synthetical methods for the preparation of particles with various geometries, such as rods [9][10][11][12][13], wires [14][15][16], prisms [17][18][19][20][21], cubes [22][23][24] and other polyhedrons [25,26].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering of Short Au Rods with Low Aspect Ratios

et al. 2007

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The translational and rotational diffusion of a series of gold nanorods with low aspect ratio was investigated by dynamic light scattering (DLS). It is shown that the translational and the rotational diffusion coefficient can be determined because the particle shape causes an anisotropy of the polarizability. This gives rise to two clearly distinguishable relaxation modes in the time correlation function of the scattered light. The particle length and aspect ratio were determined independently by transmission electron microscopy (TEM). Using a hydrodynamic model, these geometrical parameters were converted to diffusion constants, which agree well with the values determined by DLS. Additionally it is possible to obtain an estimate of the particles aspect ratio from the amplitude ratio of the two relaxation modes.

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“…9 The plasmonic resonance peak of triangular shaped metal NPs can also be tuned across the entire visible region and even into the near-infrared (NIR), which cannot be easily done with spherical particles. 13 The well-defined and tunable plasmonic properties of triangular nanoparticles triggered extensive research on preparation and application in solar cells. [14][15][16][17] However, these plasmonic metal nanoparticles usually have a disordered distribution, if the metal NPs were blended with photoactive polymers.…”

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confidence: 99%

Surface-passivated plasmonic nano-pyramids for bulk heterojunction solar cell photocurrent enhancement

et al. 2012

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We report that self-assembled gold (Au) nanopyramid arrays can greatly enhance the photocurrent of narrow bandgap organic solar cells using their plasmonic near-field effect. The plasmonic enhanced power conversion efficiency exhibited up to 200% increase under the AM 1.5 solar illumination.Organic thin film photovoltaic devices have attracted enormous attention in recent years due to their low-cost, easy processing, lightweight and flexible properties. 1,2 For an ideal solar cell to have high power conversion efficiency, adequate light absorption in the photoactive layer is required. To achieve this, increasing the thickness of the photoactive layer is an effective method. However, the increased photoactive layer thickness causes a decrease in the inner electric field, which slows down charge drift and increases the possibility of recombination, and hence reduces charge carrier collection. 3 Designing an efficient solar cell with high light absorption at a relatively small film thickness is a challenge to be resolved.Previously, it was found that the absorption and emission properties of photoactive materials can be effectively influenced by the nearby resonant plasmon from metal nanostructures which enhance not only Raman scattering, 4 fluorescence, 5 and photochemistry, 6 but also photovoltaic response. 7 The plasmonic near-field enhancement or improved coupling to guided modes in metal nanostructures will induce resonant absorption in neighboring organic photoactive materials and thus increase the concentration of excitons. 8 It was shown by theoretical investigation that optical absorption in thin film organic solar cells was greatly enhanced by up to 50% under the plasmonic effect of metallic gratings. 4 Kulkarni et al. 4 showed that charge carrier generation could be enhanced more than 3 times if a thin film of silver nanoprisms was introduced under the organic photovoltaic materials, which could in principle be used to increase photocurrent in organic thin film solar cells. By blending Au nanoparticles with poly(3,4-ethylenedioxythiophene)-poly-(styrenesulfonate) (PEDOT:PSS), Yang et al. 10 showed that plasmonic optical absorption can be used to enhance the photovoltaic performance of tandem structured organic solar cells. However, early studies have not shown the improved energy conversion efficiency in organic solar cells when plasmonic metal nanostructures were embedded into the photoactive layer, although plasmon resonant enhanced optical absorption existed; this is due to the reduced hole mobility caused by disturbed ordering in the polymer phase, or the quenching of excited states in the photoactive polymers. 11 Compared with spherical nanoparticles, triangular shaped nanoparticles show a strong plasmonic resonance at the tips, from both theory 12 and experiments. 9 The plasmonic resonance peak of triangular shaped metal NPs can also be tuned across the entire visible region and even into the near-infrared (NIR), which cannot be easily done with spherical particles. 13 The well-defined and tunable ...

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Formation of Silver Nanoprisms with Surface Plasmons at Communication Wavelengths

Cited by 246 publications

References 39 publications

Photovoltage and Photocatalyzed Growth in Citrate-Stabilized Colloidal Silver Nanocrystals

Photovoltage and Photocatalyzed Growth in Citrate-Stabilized Colloidal Silver Nanocrystals

Dynamic Light Scattering of Short Au Rods with Low Aspect Ratios

Surface-passivated plasmonic nano-pyramids for bulk heterojunction solar cell photocurrent enhancement

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