Ion-Mediated Aggregation of Gold Nanoparticles for Light-Induced Heating

Alba-Molina, David; Martín‐Romero, María T.; Camacho, Luis; Giner‐Casares, Juan J.

doi:10.3390/app7090916

Cited by 21 publications

(4 citation statements)

References 23 publications

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“…However, the UV–vis spectra of the reaction sample were recorded instantly after the synthesis, and the spectra are shown in Figure a. As can be seen, the maximum absorbance of the synthesized AuNPs is at 521.6 nm, which corresponds to the results obtained in the literature for AuNPs. − …”

Section: Resultssupporting

confidence: 63%

Development of a Theoretical Model That Predicts Optothermal Energy Conversion of Gold Metallic Nanoparticles

et al. 2020

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Gold nanoparticles (AuNPs) can be found in different shapes and sizes, which determine their chemical and physical characteristics. Physical and chemical properties of metallic NPs can be tuned by changing their shape, size, and surface chemistry; therefore, this has led to their use in a wide variety of applications in many industrial and academic sectors. One of the features of metallic NPs is their ability to act as optothermal energy converters, where they absorb light at a specific wavelength and heat up their local nanosurfaces. This feature has been used in many applications where metallic NPs get coupled with thermally responsive systems to trigger an optical response. In this study, we synthesized AuNPs that are spherical in shape with an average diameter of 20.07 nm. This work assessed simultaneously theoretical and experimental techniques to evaluate the different factors that affect heat generation at the surface of AuNPs when exposed to a specific light wavelength. The results indicated that laser power, concentration of AuNPs, time × laser power interaction, and time illumination, were the most important factors that contributed to the temperature change exhibited in the AuNPs solution. We report a regression model that allows predicting heat generation and temperature changes with residual standard errors of less than 4%. These results are highly relevant in the future design and development of applications where metallic NPs are incorporated into systems to induce a temperature change triggered by light exposure.

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Section: Resultssupporting

confidence: 63%

Development of a Theoretical Model That Predicts Optothermal Energy Conversion of Gold Metallic Nanoparticles

et al. 2020

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“…From Figure , it is obvious that the degree of 15 nm AuNP aggregates assembled by PDDA is much larger than 35 and 50 nm AuNPs. The extent of AuNP aggregation can be also reflected by the UV–vis spectra, where larger aggregates have a broader aggregation plasmon peak. , As shown in Figure a compared with b,c, the 650 nm plasmon band of the aggregates is much broader which looks like an offset from the baseline because much larger aggregates are obtained for the 15 nm AuNP assembled by PDDA. Additionally, the scattering effect of AuNP aggregates assembled by PDDA could also contribute to the much broader plasmon band from 600 to 800 nm .…”

Section: Resultsmentioning

confidence: 94%

Triplet Excited State Enhancement Induced by PDDA Polymer-Assembled Gold Nanoparticles

et al. 2019

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Gold nanoparticles (AuNPs) have unique optical properties because of their characteristic localized surface plasmon resonances (LSPRs). Upon the excitation of LSPR, AuNPs can affect the adjacent organic molecules strongly in both the ground state and the excited state. Previously, only 2−3 fold of the plasmon enhancement effect on triplet state formation was displayed because of the random and uncontrollable formation of AuNP aggregates. Here, we utilize polymer PDDA to assemble AuNPs forming aggregates with strong plasmonic resonance. By means of transient UV−visible absorption spectroscopy, the triplet state of rose bengal enhanced by PDDA−AuNPs is directly monitored and the maximum enhancement is found to be ∼10 fold. The large enhancement should be mainly resulted from the plasmon effect of AuNP aggregates. Additionally, it is found that the triplet state enhancement effect of PDDA-assembled AuNPs is sensitive to concentration of the polymer and the size of AuNPs. These findings shed light on the applications of AuNPs in triplet−triplet energy transfer, triplet exciton harvesting, and photodynamic therapy.

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“…Most of the studies on the aggregation behavior of nanoparticles have been unclear about the aggregation regimes the system will pass through as time elapses. 34,35 However, the aggregation state of the nanostructure is a crucial characteristic that needs to be considered to simulate the plasmonic response for both fundamental and practical applications. Hence, we have chosen to study the transitions between different aggregated structures of the system, which has not received attention.…”

Section: And S1 †)mentioning

confidence: 99%

Plasmon resonance dynamics and enhancement effects in tris(2,2′-bipyridine)ruthenium(ii) gold nanosphere oligomers

Yunusa,

Warren,

Schauer

et al. 2024

Nanoscale

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Ion-Mediated Aggregation of Gold Nanoparticles for Light-Induced Heating

Cited by 21 publications

References 23 publications

Development of a Theoretical Model That Predicts Optothermal Energy Conversion of Gold Metallic Nanoparticles

Development of a Theoretical Model That Predicts Optothermal Energy Conversion of Gold Metallic Nanoparticles

Triplet Excited State Enhancement Induced by PDDA Polymer-Assembled Gold Nanoparticles

Plasmon resonance dynamics and enhancement effects in tris(2,2′-bipyridine)ruthenium(ii) gold nanosphere oligomers

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