Full-Color Tuning of Surface Plasmon Resonance by Compositional Variation of Au@Ag Core–Shell Nanocubes with Sulfides

Park, Garam; Lee, Chanhyoung; Seo, Daeha; Song, Hyunjoon

doi:10.1021/la300154x

Cited by 71 publications

(43 citation statements)

References 47 publications

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“…PbS CQDs and Au@Ag Core-Shell NCs Synthesis : Oleic acid-capped PbS QDs (the fi rst exciton peak: 950 nm) [ 11,29 ] and Au@ Ag core-shell NCs [ 14 ] were prepared as previously described.…”

Section: Methodsmentioning

confidence: 99%

“…In this report, we employed the Au@Ag NCs (Figure 1 b, average size: 70 ± 6 nm), which generated stronger plasmonic scattering in the longer wavelength range and formed Au@Ag NCs-HL structure ( Figure S1, Supporting Information). [14][15][16] The plasmonic responses of Au@ Ag NCs are typically limited in the visible wavelength region (≈700 nm). However, embedding the Au@Ag NCs into higher refractive index materials is expected to extend the plasmonic responses to the NIR region.…”

Section: Doi: 101002/adma201503642mentioning

confidence: 99%

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A Resonance‐Shifting Hybrid n‐Type Layer for Boosting Near‐Infrared Response in Highly Efficient Colloidal Quantum Dots Solar Cells

et al. 2015

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A new configuration of a plasmonic quantum dots solar structure is proposed. Gold-silver core-shell metal nanoparticles (Au@Ag NCs) are incorporated into the TiO2 layer (Au@Ag NCs-HL) of PbS-based solar cells. The TiO2 layer enables the Au@Ag NCs to have broad plasmonic responses and the external quantum efficiency and absorption of the plasmonic devices are significantly enhanced. The electrical performance of the solar cells is also improved.

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“…PbS CQDs and Au@Ag Core-Shell NCs Synthesis : Oleic acid-capped PbS QDs (the fi rst exciton peak: 950 nm) [ 11,29 ] and Au@ Ag core-shell NCs [ 14 ] were prepared as previously described.…”

Section: Methodsmentioning

confidence: 99%

Section: Doi: 101002/adma201503642mentioning

confidence: 99%

A Resonance‐Shifting Hybrid n‐Type Layer for Boosting Near‐Infrared Response in Highly Efficient Colloidal Quantum Dots Solar Cells

et al. 2015

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“…In the case of excessive iodine ions, Chen et al implemented colorimetric detection of mercury ions by using a mercury ion for the protection of twelve mercaptan-capped Ag nanoprisms undergoing morphology changes. 31 Following the same idea, a novel nonaggregation colorimetric sensor for the detection of dopamine was developed based on the rapid response of an Au nanorod-Ag + system to dopamine, forming a new structure of Au-Ag core-shell nanorods, which caused the Au nanorod LSPR blue shift to be accompanied with brilliant color changes of the colloids. The colorimetric mechanism is that the coating shell changes the local dielectric environment of the inner core, leading to the shift of the spectra, thus realizing the target molecule detection.…”

Section: Introductionmentioning

confidence: 99%

A promising direct visualization of an Au@Ag nanorod-based colorimetric sensor for trace detection of alpha-fetoprotein

Zhang

Zhu

et al. 2015

J. Mater. Chem. C

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The Ag coating-induced blue shift and enhancement of longitudinal plasmon of Au nanorods result in abundant and tunable optical absorptions in the visible region, which leads to the Au@Ag nanorod becoming a good candidate for colorimetric sensing. In this paper, we have reported an effective and simple approach for visualization detection of alpha-fetoprotein (AFP) based on Au@Ag core-shell nanorods. The AFP concentration-dependent colloid color of Au@Ag core-shell nanorods could change from green to gray, olivine to brown, and even blue to violet to pink, which are more varied color changes compared with the traditional red to blue color change. Besides, as the Ag shell thickness is increased, a dip was observed, which is located between two strong absorption peaks. The change of the dip is proposed as a new biosensor parameter for biomolecule detection based on absorption spectra.AFP concentration detection could be realized according to the change of the position and intensity of the dip, which has not been reported in the biomolecule detection field so far. Au@Ag core-shell nanorods with a small aspect ratio of inner Au nanorods are more suitable for direct read-out visualization, with a color change from blue to violet to pink. From the point of view of spectra analysis, Au@Ag core-shell nanorods with a greater aspect ratio of inner Au nanorods show higher spectral sensitivity. Furthermore, it is found that non-centrifuged Au@Ag core-shell nanorods are preferentially assembled in a side-by-side fashion with the addition of AFP, which will provide new approaches for other kinds of nanorods in controllable assembly fashions.

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“…Whereas gratings are often mass produceable due to cast molding and etching technologies, other methods with different purposes have been investigated, and a wide range of colors have been produced. Examples are surface plasmons on structured surfaces with deposited metallic layers [15,16], controlling absorption of coated metallic nanoparticles by controlling size parameters [17], and plasmon effects in carbon nanostructures [18]. All of these methods are capable of producing a variety of colors, but with little control of their appearance with respect to angular distribution.…”

Section: Introductionmentioning

confidence: 99%

Design of structurally colored surfaces based on scalar diffraction theory

Johansen¹,

Andkjær²,

Sigmund³

2014

J. Opt. Soc. Am. B

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In this paper we investigate the possibility of controlling the color and appearance of surfaces simply by modifying the height profile of the surface on a nanoscale level. The applications for such methods are numerous: new design possibilities for high-end products, color engraving on any highly reflective surface, paint-free text and coloration, UV-resistant coloring, etc. In this initial study, the main focus is on finding a systematic way to obtain these results. For now the simulation and optimization is based on a simple scalar diffraction theory model. From the results, several design issues are identified: some colors are harder to optimize for than others, and some can be produced by only a few height levels, whereas others require more complex structures. It is shown that a wide range of results can be obtained.

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Full-Color Tuning of Surface Plasmon Resonance by Compositional Variation of Au@Ag Core–Shell Nanocubes with Sulfides

Cited by 71 publications

References 47 publications

A Resonance‐Shifting Hybrid n‐Type Layer for Boosting Near‐Infrared Response in Highly Efficient Colloidal Quantum Dots Solar Cells

A Resonance‐Shifting Hybrid n‐Type Layer for Boosting Near‐Infrared Response in Highly Efficient Colloidal Quantum Dots Solar Cells

A promising direct visualization of an Au@Ag nanorod-based colorimetric sensor for trace detection of alpha-fetoprotein

Design of structurally colored surfaces based on scalar diffraction theory

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