Surface-enhanced Raman scattering and photothermal effect of hollow Au nanourchins with well-defined cavities

Kim, Joon Ki; Park, Tae-Hyeon; Jang, Du‐Jeon

doi:10.1007/s11051-020-05034-y

Cited by 8 publications

(5 citation statements)

References 43 publications

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“…The reduction time for complete wrapping is dependent on the laser intensity; therefore, control of the laser intensity and reduction time can create bowl nanostructures (see Supplementary Material, Figure S5b ) or hollow nanoclusters (see Supplementary Material, Figure S5c ) after elimination of the silica spheres using hydrofluoric acid. Such bowl and hollow nanoclusters have gained attention in recent years due to physical properties such as high specific surface area, and structural properties that benefit the applications for plasmonic devices and energy storage [ 13 , 14 , 15 ]. Although the hollow nanoclusters are generally synthesized by wet-chemical methods, the laser near-field reduction can create pure metal nanostructures because it does not require additional agents such as photoinitiators and surfactants.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Superstructure Arrays Fabricated by Laser Near-Field Reduction for Wide-Range SERS Analysis of Fluorescent Materials

Bai

et al. 2022

Nanomaterials

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Surface-enhanced Raman scattering (SERS) enables trace-detection for biosensing and environmental monitoring. Optimized enhancement of SERS can be achieved when the energy of the localized surface plasmon resonance (LSPR) is close to the energy of the Raman excitation wavelength. The LSPR can be tuned using a plasmonic superstructure array with controlled periods. In this paper, we develop a new technique based on laser near-field reduction to fabricate a superstructure array, which provides distinct features in the formation of periodic structures with hollow nanoclusters and flexible control of the LSPR in fewer steps than current techniques. Fabrication involves irradiation of a continuous wave laser or femtosecond laser onto a monolayer of self-assembled silica microspheres to grow silver nanoparticles along the silica microsphere surfaces by laser near-field reduction. The LSPR of superstructure array can be flexibly tuned to match the Raman excitation wavelengths from the visible to the infrared regions using different diameters of silica microspheres. The unique nanostructure formed can contribute to an increase in the sensitivity of SERS sensing. The fabricated superstructure array thus offers superior characteristics for the quantitative analysis of fluorescent perfluorooctanoic acid with a wide detection range from 11 ppb to 400 ppm.

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Section: Resultsmentioning

confidence: 99%

Plasmonic Superstructure Arrays Fabricated by Laser Near-Field Reduction for Wide-Range SERS Analysis of Fluorescent Materials

Bai

et al. 2022

Nanomaterials

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“…The absorption increase at 800+nm can be attributed to the growth of nanobranches. In particular, the broad absorption pattern is considered to be LSPR arising from hybridization between the LSPRs of the nanoshells and the nanobranches [32,36,37]. The effect of the reaction temperature has also been examined (figure S7); BAuNSs_100 were fabricated at four different temperatures of 20, 40, 60, and 80 °C.…”

Section: Resultsmentioning

confidence: 99%

“…By employing e-SA NPs as the seed assemblies, BAuNSs were successfully grown with the help of Ag + ions and L-DOPA (figures 2(c), (d)). L-DOPA molecules behaved as both reducing agents and shape-directing surfactants while Ag + ions behaved as cosurfactants [32,33]. BAuNSs were fabricated to have quite uniform structures overall, as shown in a low-resolution TEM image (figure S2).…”

Section: Characterizationmentioning

confidence: 99%

Seed-assembly-mediated fabrication and application of highly branched gold nanoshells having hollow and porous morphologies

Park¹,

Jeong²,

Lee³

et al. 2022

Nanotechnology

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Highly branched gold nanoshells (BAuNSs) having hollow and porous morphologies have been fabricated via a seed-assembly-mediated strategy. Gold seed assemblies can be prepared by removal of SiO2 nanotemplates with help of polyvinylpyrrolidone (PVP) molecules, which weakly link gold nanoparticles together even after SiO2 etching. L-3,4-dihydroxy phenylalanine (L-DOPA) and AgNO3 are employed as shape-directing agents to induce the anisotropic growth of gold. BAuNSs exhibit 7.4 and 4.4 times stronger activities than SiO2@Au nanoparticles in catalysis and surface-enhanced Raman scattering (SERS) applications, respectively, due to their large surface areas and numerous hot spots. It is necessary to find the optimal amount of gold deposition in fabrication to effectively utilize the hollow and porous morpologies of BAuNSs for catalysis and SERS applications. Overgrown nanobranches can fill the nanopores and nanogaps of BAuNSs, resulting in decrease of activities in applications. Overall, the seed-assembly-mediated fabrciation can be employed to produce plasmonic nanostructures having unique morphologies and high application activities.

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“… 6,97 As a consequence of the synthetic method, many of these hollow nanostructures are considered bimetallic structures, but in some the trace amounts of the templating metal are low enough to be considered inconsequential. 98,99 …”

Section: Synthetic Techniquesmentioning

confidence: 99%

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

Siegel

Baker

2021

Nanoscale Adv.

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Surface-enhanced Raman scattering and photothermal effect of hollow Au nanourchins with well-defined cavities

Cited by 8 publications

References 43 publications

Plasmonic Superstructure Arrays Fabricated by Laser Near-Field Reduction for Wide-Range SERS Analysis of Fluorescent Materials

Plasmonic Superstructure Arrays Fabricated by Laser Near-Field Reduction for Wide-Range SERS Analysis of Fluorescent Materials

Seed-assembly-mediated fabrication and application of highly branched gold nanoshells having hollow and porous morphologies

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

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