Laser-Induced Optoacoustic Spectroscopy Studies of Inorganic Functionalized Metallic Nanorods

Błaszkiewicz, Paulina; Kotkowiak, Michał; Coy, Emerson; Dudkowiak, Alina

doi:10.1021/acs.jpcc.9b09418

Cited by 12 publications

(15 citation statements)

References 56 publications

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“…A further analysis unveils that the Δ T is tightly correlated to the p ( r ) value of the Au NP, indicating that a Au NP with larger absorption power density could cause higher Δ T at the LSPR excitation. The calculated Δ T maximum of the AuSP is in good agreement with the results previously reported in the literature with a similar particulate size. − Again, the Au NPs with sharp structural features such as AuNR, AuST, and AuBP exhibit obviously higher Δ T maximum than AuSP and AuNC, which is consistent with the change trend of their Jo numbers. We have shown that an increase in the N Au could red-shift the LSPR wavelength along with a slight decrease of the near-field enhancement, but it causes significant decrease of the Jo number, especially for AuNR, AuST, and AuBP.…”

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confidence: 90%

“…In addition, we also found that the σ abs /σ ext ratio is almost constant at N Au < 5.0 × 10 5 but obviously decreases with an increase in N Au when N Au exceeds 1.0 × 10 6 for all these different shaped Au NPs (Figure S6B). It can be explained that the optical scattering becomes more obvious at a larger particle size, which decreases the light-to-heat conversion efficiency. , A comparison analysis further reveals that the change of the Jo number does not follow the change of the σ abs (Figure D(ii)). This is mainly ascribed to the distinct geometric dependence of the σ abs of these Au NPs.…”

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confidence: 99%

“…It can be explained that the optical scattering becomes more obvious at a larger particle size, which decreases the light-to-heat conversion efficiency. 41,42 A comparison analysis further reveals that the change of the Jo number does not follow the change of the σ abs (Figure 1D(ii)). This is mainly ascribed to the distinct geometric dependence of the σ abs of these Au NPs.…”

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confidence: 99%

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Quantitative Analysis of the Shape Effect of Thermoplasmonics in Gold Nanostructures

Zhang

Zhu

2023

J. Phys. Chem. Lett.

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The shape effect of thermoplasmonic properties of Au nanostructures remains largely unexplored. Herein, we report a systematic investigation on the photothermal effects of Au nanoparticles (NPs) of different shapes: nanosphere, nanocube, nanorod, nanostar, and nanobipyramid. The Joule (Jo) number (absorption cross section normalized by the particulate volume) is utilized for quantitatively assessing the photothermal properties of these different shaped Au NPs. It is shown that the Jo number of Au NPs greatly varies with the geometric shape and localized surface plasmon resonance (LSPR) wavelength. Specifically, the Jo number decreases with the red-shifting of the LSPR wavelength in these Au NPs, and the Au NPs of sharp structural features such as Au nanorod, nanostar and nanobipyramid have a much larger Jo number, indicative of their exceptional light-to-heat conversion ability. We further demonstrate the close correlation of the Jo number of Au NPs of different shapes with their optical absorption power density.

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Quantitative Analysis of the Shape Effect of Thermoplasmonics in Gold Nanostructures

Zhang

Zhu

2023

J. Phys. Chem. Lett.

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“…The finite integration technique was used to calculate the scattering yields (ϕ sc ) of Au-NRs@SiO 2 . The details and methodology of simulation are given in our previous work. − Taking into account the dimensions of Au-NRs@SiO 2 from the analysis of TEM images, the optical extinction and radar cross sections (i.e., ECS, RCS respectively) were calculated. ϕ sc was determined by the relative contribution of RCS to ECS.…”

Section: Methodsmentioning

confidence: 99%

Tailoring Fluorescence and Singlet Oxygen Generation of a Chlorophyll Derivative and Gold Nanorods via a Silica Shell

et al. 2019

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Gold nanorods deserve special attention as they exhibit tunable longitudinal localized surface plasmon resonances (LSPRs). In our study, gold nanorods of the aspect ratio of 2.25 (maximum of LSPR band at 660 nm) and of controllable SiO 2 thickness in the range of 6−14 nm were mixed with pheophorbide (chlorophyll derivative) in order to create a hybrid system. Energy transfer and singlet oxygen generation were studied for different SiO 2 thicknesses of the nanorod shell. The spectral properties of the hybrid mixture were characterized, and the overlapping of the pheophorbide fluorescence and the longitudinal LSPR band of nanorods on the fluorescence emission, energy transfer, and generation of singlet oxygen were studied. Two independent approaches were used to determine the quantum yield and enhanced factor of singlet oxygen generation. For a certain thickness of the SiO 2 shell and for certain concentrations of gold nanorods, the effect of the plasmon-enhanced singlet oxygen production was observed. Moreover, the enhanced of singlet oxygen yield enhancement was correlated with the far-field optical properties of the gold nanorods. The results obtained indicate the significance of further studies of dye-photosensitizers in hybrid mixtures, taking into account the spectral overlap between dye emission and longitudinal LSPR bands as well as the character of coatings (type and thickness) and scattering yields of gold nanorods.

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“…Our previous approach for the Au-NRs was used. 13 All of the simulations presented in this paper used a frequency domain solver with a tetrahedral mesh. We used a tetrahedral mesh of about 58000 cells.…”

Section: Surface Film Preparation Andmentioning

confidence: 99%

In Situ Tracked Hybridization Phenomenon of Gold Nanorods in Monolayer Systems

Kotkowiak,

Mleczko

2024

J. Phys. Chem. C

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The tuning of optical resonances in nanoparticle assemblies is primarily achieved through the fundamental principle of plasmonic coupling. When the nanoparticles interact in close proximity, plasmonic coupling modes could be generated with energies sensitive to the type of nanoparticle assembly. By precise polymer-based gold nanorod functionalization, we produce Langmuir monolayers of gold nanorods and control, in situ, the ability of nanoparticles to hybridize, thereby regulating the optical response of the nanoparticles. This strategy enables an understanding of the hybridization phenomenon of gold nanorods in monolayer systems. In the long term, this work enables the investigation of in situ hybridization of nanoparticle systems with reduced particle numbers.

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Laser-Induced Optoacoustic Spectroscopy Studies of Inorganic Functionalized Metallic Nanorods

Cited by 12 publications

References 56 publications

Quantitative Analysis of the Shape Effect of Thermoplasmonics in Gold Nanostructures

Quantitative Analysis of the Shape Effect of Thermoplasmonics in Gold Nanostructures

Tailoring Fluorescence and Singlet Oxygen Generation of a Chlorophyll Derivative and Gold Nanorods via a Silica Shell

In Situ Tracked Hybridization Phenomenon of Gold Nanorods in Monolayer Systems

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