A Study on the Plasmonic Properties of Silver Core Gold Shell Nanoparticles: Optical Assessment of the Particle Structure

Mott, Derrick; Lee, JaeDong; Thủy, Nguyễn Thị Bích; Aoki, Yoshiya; Singh, Prerna; Maenosono, Shinya

doi:10.7567/jjap.50.065004

Cited by 9 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 nm decrease in the diameter of the Au@Ag@Au _More Au sample compared to the Au@Ag@ Au _Less Au sample (see Figure 2), the observed redshift must be a result of the difference in composition. 15,50 The LSPR peak for these systems does not lie between the LSPR peaks of monometallic silver and gold on the above plot (as would be expected with silver, gold, and bimetallic nanoparticles of comparable size 51 ) as the large size of the silver nanoparticles (diameter 77 nm) substantially redshifts the silver LSPR peak. To confirm the stability of the colloids, UV−vis spectra were recorded again, one month after synthesis; these spectra are shown in Figure S5 (Supporting Information).…”

Section: ■ Results and Discussionmentioning

confidence: 60%

“…13,14 Multishell bimetallic nanostructures, such as Au@Ag@Au (core@shell@shell), are desired for their optical properties. 15,16 Here, the Ag middle layer displays optimal localized surface plasmon resonance (LSPR) properties with the outer Au shell providing increased stability in biological environments. 17 In addition, the Au core stabilizes the Ag middle layer against the galvanic replacement reaction; the galvanic replacement would take place if pure Ag nanoparticles were used as cores and Au were to be deposited directly onto them.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure of Gold–Silver Nanoparticles

et al. 2017

Self Cite

View full text Add to dashboard Cite

Nanoparticles with nominal structures of Au@Ag (core@shell) and Au@Ag@Au (core@shell@shell) were prepared using the sequential citrate reduction technique and characterized using routine characterization techniques, including transmission electron microscopy. X-ray absorption spectroscopy was then carried out on the samples, and extended X-ray absorption fine structure (EXAFS) analysis was used to determine the structure of the systems. The results of the routine techniques and the X-ray absorption spectroscopy were then compared. EXAFS analysis of the nanoparticles with the Au@Ag structure revealed very limited bimetallic interactions, supporting the assignment of a core@shell structure. EXAFS analysis of the nanoparticles with Au@Ag@Au structure showed an increased proportion of bimetallic interactions. Based on the colloid composition, the other characterization techniques and the chemistry of the system, these nanoparticles were interpreted as having an Au@Au/Ag-alloy structure. The EXAFS analyses corroborated the other characterization techniques and enabled the determination of the average-structure of the entire sample.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 60%

Section: ■ Introductionmentioning

confidence: 99%

Structure of Gold–Silver Nanoparticles

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the case of silver-gold core-shell arrangements, there will be a red shift as gold has a plasmon resonance peak at a longer wavelength than silver. As the gold shell thickness increases, the absorbance peak also diminishes [ 78 , 79 ]. In addition to these changes, silver-gold or gold-silver core-shell arrangements create two plasmon resonance peaks [ 76 , 78 , 80 ] corresponding to silver and gold.…”

Section: Enhancement Dependency On Nanoparticle Properties For Intmentioning

confidence: 99%

Nanoparticle Properties and Synthesis Effects on Surface‐Enhanced Raman Scattering Enhancement Factor: An Introduction

Israelsen

Hanson

Vargis

2015

The Scientific World Journal

158

View full text Add to dashboard Cite

Raman spectroscopy has enabled researchers to map the specific chemical makeup of surfaces, solutions, and even cells. However, the inherent insensitivity of the technique makes it difficult to use and statistically complicated. When Raman active molecules are near gold or silver nanoparticles, the Raman intensity is significantly amplified. This phenomenon is referred to as surface-enhanced Raman spectroscopy (SERS). The extent of SERS enhancement is due to a variety of factors such as nanoparticle size, shape, material, and configuration. The choice of Raman reporters and protective coatings will also influence SERS enhancement. This review provides an introduction to how these factors influence signal enhancement and how to optimize them during synthesis of SERS nanoparticles.

show abstract

“…Therefore, silanization must be performed in nonaqueous environments in which it is difficult to maintain stable NP dispersions. In the literature, there are several examples of gold nanoshells grown on different cores such as BaTiO 3 , [11] KNbO 3 , [12] iron oxide [13,14] and other magnetic core, [15,16] silver NPs, [17] polystyrene, [18] and semiconductor. [19] Wang et al [11] synthesized a gold shell on 50 nm spherical BaTiO 3 NPs after hydroxylation of the surface with H 2 O 2 and with 3-aminopropyltriethoxysilane to obtain amine terminations.…”

Section: Introductionmentioning

confidence: 99%

Gold Raspberry Shell Grown onto Nonspherical Lithium Niobate Nanoparticles for Second Harmonic Generation and Photothermal Applications

Taitt

Urbain

Bredillet

et al. 2022

Part & Part Syst Charact

View full text Add to dashboard Cite

They should also have a high photothermal conversion efficiency (percentage of absorbed light converted to heat), good photothermal stability, be nontoxic and allow for easy surface modifications. [2] The examples of PTAs found in the literature can be classified as noble metal-based nanoparticles (NPs), semiconductor nanocrystals, carbon-based NPs, and organic semiconducting polymeric NPs. [3] The noble metal PTAs, particularly the Au-based nanostructures are very attractive as Au has been extensively studied for its biocompatibility and ease of surface functionalization. Additionally, their shape and morphology also enable excitation wavelength tunability. The Au-based nanostructures that are interesting for PTT include nanorods, nanoshells, and nanostars. Among them, the Au nanoshell structure is particularly appealing as it is inherently a hybrid NP combining another core material to provide multifunctional and multimodal applications (for example, a gold shell encapsulating a material with contrast agent capabilities). Their light-to-heat conversion properties are due to their high absorption cross-section because of their localized surface plasmon resonances that can be tuned in a broad range of wavelength from 700 to 1000 nm depending on the shell thickness to core diameter ratio. [4,5] Recently, gold Nanoparticles (NPs) containing a lithium niobate (LiNbO 3 ) core and a gold shell are prepared using a combination of seeded-growth and layer-by-layer approaches. The method includes first the surface charge reversal of lithium niobate with branched polyethyleimine, second, the electrostatic binding of gold seeds, and third, successive reduction steps of gold chloride onto the gold-seeded LiNbO 3 NPs for the progressive and surface-directed growth of the gold shell. The influence of three synthesis parameters, namely, pH, initial density of gold seeds covering the lithium niobate core, and gold chloride concentration, on the NPs' characteristics (structural properties, plasmon band, surface charge, hydrodynamic diameter) is studied. The progress of the gold shell growth is investigated by X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. In addition, it is shown that LN@Au core-shell NPs can emit a second harmonic generation signal when excited by a femtosecond laser. Finally, photothermal properties are studied, showing an increase of temperature of 8.6 °C upon infrared excitation, with an estimated light-to-heat conversion efficiency of 40% and a specific absorption rate of 8000 W g −1 .

show abstract

A Study on the Plasmonic Properties of Silver Core Gold Shell Nanoparticles: Optical Assessment of the Particle Structure

Cited by 9 publications

References 25 publications

Structure of Gold–Silver Nanoparticles

Structure of Gold–Silver Nanoparticles

Nanoparticle Properties and Synthesis Effects on Surface‐Enhanced Raman Scattering Enhancement Factor: An Introduction

Gold Raspberry Shell Grown onto Nonspherical Lithium Niobate Nanoparticles for Second Harmonic Generation and Photothermal Applications

Contact Info

Product

Resources

About