Simple and rapid method for homogeneous dimer formation of gold nanoparticles in a bulk suspension based on van der Waals interactions between alkyl chains

Esashika, Keiko; Ishii, Ryo; Tokihiro, Shunya; Saiki, Takanao

doi:10.1364/ome.9.001667

Cited by 18 publications

(36 citation statements)

References 37 publications

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“… 49 The DEM-derived D f evolution shown in Figure 1 a was obtained using d p = 30 nm to be consistent with the d p range that is relevant for UV–vis spectroscopy measurements. 4 , 5 , 29 , 33 , 34 The D f was measured by Grogan et al ( 31 ) for NPs with d p = 5 nm. Decreasing d p from 30 to 5 nm increases D f by 3–9% (as shown in Figure 5 a of ref ( 23 )).…”

Section: Resultsmentioning

confidence: 99%

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Light Extinction by Agglomerates of Gold Nanoparticles: A Plasmon Ruler for Sub-10 nm Interparticle Distances

et al. 2022

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Plasmon rulers relate the shift of resonance wavelength, λ l , of gold agglomerates to the average distance, s , between their constituent nanoparticles. These rulers are essential for monitoring the dynamics of biomolecules ( e.g., proteins and DNA) by determining their small (<10 nm) coating thickness. However, existing rulers for dimers and chains estimate coating thicknesses smaller than 10 nm with rather large errors (more than 200%). Here, the light extinction of dimers, 7- and 15-mers of gold nanoparticles with diameter d p = 20–80 nm and s = 1–50 nm is simulated. Such agglomerates shift λ l up to 680 nm due to plasmonic coupling, in excellent agreement with experimental data by microscopy, dynamic light scattering, analytical centrifugation, and UV–visible spectroscopy. Subsequently, a new plasmon ruler is derived for gold nanoagglomerates that enables the accurate determination of sub-10 nm coating thicknesses, in excellent agreement also with tedious microscopy measurements.

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Section: Resultsmentioning

confidence: 99%

“… 30 These simulations and the plasmon ruler are compared to microscopy, 4 , 31 dynamic light scattering, 32 analytical centrifugation, 29 and UV–visible spectroscopy data. 4 , 5 , 29 , 33 , 34 This set of data is the largest ever for benchmarking plasmon rulers, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Light Extinction by Agglomerates of Gold Nanoparticles: A Plasmon Ruler for Sub-10 nm Interparticle Distances

et al. 2022

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“…11,12 In decades, achieving a superior SERS activity has been dominantly relied on the plasmonic nanostructures (i.e., Au and Ag particles) by taking advantage of localized surface plasmon resonance (LSPR) property. 13,14 Meanwhile, it preferentially requires the matching of the LSPR extinction position with the incident laser wavelength to excite the strongest electromagnetic field (known as the 'hotspot') [15][16][17][18][19][20][21][22][23] . As the LSPR extinction position of noble-metal nanoparticles (i.e., Au nanoparticles) is essentially located in the visible wavelength region, visible-wavelength lasers are thus considered and widely used as the excitation light source.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 Moreover, it preferentially requires the matching of the LSPR extinction position with the incident laser wavelength to excite the strongest electromagnetic field (known as the 'hotspot'). [15][16][17][18][19][20][21][22][23] As the LSPR extinction position of noble-metal nanoparticles (i.e., Au nanoparticles) is essentially located in the visible wavelength region, visible-wavelength lasers are thus considered and widely used as the excitation light source. While the use of visible-wavelength lasers has some limitations, such as a short penetration depth in tissues and the signal overwhelmed by the fluorescent background.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic self-assembly of 2D Janus PS@Au nanoraspberry photonic-crystal array with enhanced near-infrared SERS activity

et al. 2022

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“…Au colloids or nanoparticles, which possess a small imaginary part of permittivity, are typically used for LSPR [26,27]. Generally, spherical Au exhibits LSPR peaks in the visible light region [28,29]. Recently, research has been conducted to control the shape of particles and obtain spikes, rods, and heteromorphic nanoparticles that can achieve localized surface plasmon effects at wavelengths different from those of spherical nanoparticles [30,31].…”

Section: Introductionmentioning

confidence: 99%

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

et al. 2021

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Compact and highly sensitive near-infrared photodetectors that are operable at room temperature are required for light detection and ranging and medical devices. Two-dimensional (2D) PtSe2, a transition metal dichalcogenide, is a candidate material for near-infrared light detection. However, the photoresponse properties of 2D PtSe2 are currently inferior to those of commercial materials. The localized surface plasmon resonance of Au has been widely used for photoelectric field enhancement and in photochemical reactions associated with phase relaxation from plasmon states that occur at specific wavelengths. Spherical Au nanocolloids exhibit an extinction peak in the visible light region, whereas nanorods can be tuned to exhibit the extinction peak in the near-infrared region by controlling their aspect ratio. In this study, hybrid Au nanorod/2D PtSe2 structure was fabricated via spin coating nanorods, with plasmon peaks in the near-infrared region, on 2D PtSe2. Furthermore, the effect of the concentration of the nanorod solution on the photoresponse of nanorod/2D PtSe2 was investigated. The photocurrent of 5 nM Au nanorod-coated 2D PtSe2 was fivefold higher than that of bare 2D PtSe2. The responsivity was maximum 908 μW/A at 0.5 V bias voltage. In addition, the photocurrent enhancement mechanism by Au nanorods is discussed.

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Simple and rapid method for homogeneous dimer formation of gold nanoparticles in a bulk suspension based on van der Waals interactions between alkyl chains

Cited by 18 publications

References 37 publications

Light Extinction by Agglomerates of Gold Nanoparticles: A Plasmon Ruler for Sub-10 nm Interparticle Distances

Light Extinction by Agglomerates of Gold Nanoparticles: A Plasmon Ruler for Sub-10 nm Interparticle Distances

Electrostatic self-assembly of 2D Janus PS@Au nanoraspberry photonic-crystal array with enhanced near-infrared SERS activity

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

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