Photostability of gold nanoparticles with different shapes: the role of Ag clusters

Attia, Yasser A.; Buceta, David; Requejo, Félix G.; Giovanetti, Lisandro J.; López‐Quintela, M. Arturo

doi:10.1039/c5nr01887k

Cited by 56 publications

(39 citation statements)

References 55 publications

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“…The reference f R D , in the absence of Au-NPs, is 52% at 655 nm for MB, 53% at 402 nm and 505 nm for HP. 38 The effect of Au-NPs on the efficiency of the singlet oxygen generation, the energy transfer efficiency and fluorescence emission yield are shown, for both dyes, in Fig. S4 (ESI †).…”

Section: Resultsmentioning

confidence: 99%

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Kotkowiak

Dudkowiak

2015

Phys. Chem. Chem. Phys.

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In a hybrid mixture of organic (dye) and inorganic (metallic nanoparticles) components, the optical properties of a dye can be easily controlled by tailoring the shape or the concentration of the noble metal nanoparticles (NPs). The influences of multiexcitation (multiwavelength excitation) of photosensitizers (pheophorbide a and hematoporphyrin) on the interactions with pegylated Au-NPs and on the photophysical parameters of the dyes are studied. Detailed, systematic fluorescence quenching studies were performed in the mixtures of different contents of Au-NPs, and interpreted together with the results of quantum singlet oxygen yield examinations. According to the results, the fluorescence of the two dyes studied was effectively quenched in the presence of Au-NPs, mainly because of the resonance energy transfer between the donor (dye) and the acceptor (Au-NPs). Stern-Volmer quenching constants were determined by a few orders of magnitude higher than those describing the photochemical quenching process. In hybrid mixtures analyzed, the mechanism of energy transfer between the donor and the acceptor was nanometal surface energy transfer. Furthermore, different behavior of the mixtures on excitation with the wavelengths from the Soret and Q bands of the dyes and with those corresponding to the surface plasmon resonance band of Au-NPs was analyzed. Moreover, for certain concentrations of Au-NPs and for certain excitation wavelengths, an increase in singlet oxygen generation was observed. The results obtained indicate the significance of further studies of photosensitizers in hybrid mixtures with NPs.

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Section: Resultsmentioning

confidence: 99%

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Kotkowiak

Dudkowiak

2015

Phys. Chem. Chem. Phys.

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“…Engineered nanoparticles (NPs) are being used for a broad array of high-technology applications, including sensing, imaging, targeted drug delivery, biodiagnostics, catalysis, optoelectronics, and film growth seeding [1,2]. The enhanced optical, electrical, and catalytic properties of metal NPs are strongly correlated with their size, shape, and structure [3].…”

Section: Discussionmentioning

confidence: 99%

“…UV-VIS absorption bands are related to important properties such as the diameter [5], shape [2], and polydispersion [6] of metallic and 2 https://doi.org/10.6028/jres.122.037 semiconductor NPs. Thus, this analytical technique is used during NP synthesis to monitor NP formation, to assess suspension stability under different conditions and media [7,8], and to establish the optical properties of the newly formed nanomaterials [9].…”

Section: Discussionmentioning

confidence: 99%

NanoUV-VIS: An Interactive Visualization Tool for Monitoring the Evolution of Optical Properties of Nanoparticles Throughout Synthesis Reactions

Jiménez¹,

Sarmanho²,

Murphy³

et al. 2017

J. RES. NATL. INST. STAN.

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Engineered nanoparticles (NPs) are being used for a broad array of high technology applications including sensing, imaging, targeted drug delivery, bio-diagnostics, catalysis, optoelectronics and film growth seeding. The enhanced optical, electrical and catalytic properties of metal NPs are strongly correlated with their size, shape, and structure. As such, physicochemical characterization of NPs is critically important to ensure their effective use and applicability. In this context, Ultraviolet/Visible Spectroscopy (UV/VIS) is one of the most widely used methods for measuring the optical properties and electronic structures of NPs. UV/VIS absorption bands are related to important properties such as the diameter, shape, and polydispersity of metallic and semi- conducting NPs. Thus, this analytical technique is used during NP synthesis to monitor NP formation, assess suspension stability under different conditions and media, and to establish the optical properties of the newly formed nanomaterials. In view of the extensive use of UV/VIS for NP characterization and monitoring of NP formation during synthesis reactions, we have developed NanoUV-VIS, an interactive web application designed for the analysis of multiple UV-VIS absorbance spectra measured as a function of time. Graphical visualizations of the data in 2 dimensions (spectrum plot, contour plot) and 3 dimensions (surface plot) are created by this tool. In addition, the NanoUV-VIS tool evaluates and estimates important parameters related to the absorption bands of NPs, including, maximum optical absorbance, Surface Plasmon Resonance (SPR) peak and the Full Width at Half Maximum (FWHM) of the UV/VIS spectra. This information is available to download as a table in the software, as well as in the form of interactive plots, where the scientist can compare the behavior of these parameters in order to better interpret the outcomes of the experiment.

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“…For the preparation of different shapes of gold nanoparticles, seeds and growth solutions were made as described below [34]- [36]:…”

Section: Methodsmentioning

confidence: 99%

“…The objectives of this study are twofold that are continuation to our previous results [34]- [36]; 1) to investigate the role of shape and capping material on the thermal decomposition of gold nanoparticles as the stability enhancement is of interest for practical applications and 2) to investigate the dynamics of the hot carriers in the gold nanoparticles of different shapes, induced by femtosecond laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Hot Carrier Dynamics of Gold Nanoparticles of Different Shapes

Attia¹,

Altalhi²,

Gobouri³

2015

ANP

Self Cite

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Anisotropic shapes of gold nanoparticles are prepared using a modified seed method in the presence of silver ions or clusters in order to study the thermal stability and the dynamics of the hot carriers induced by femtosecond laser pulses. Although gold nanospheres are stable towards thermal treatment, the decomposition of the gold nanorods into spherical nanoparticle aggregates upon thermal treatment is mechanistically different from the case of nanoprisms. Great enhancement of thermal stability is achieved by modifying the surface of the nanoparticles by adding specific amounts of polyvinyl pyrrolidone (PVP) after preparation of gold particles of different shapes capped with cetyltrimethylammonium bromide (CTAB). The surface plasmon resonance spectra of the gold nanostructures are used to monitor their morphological changes. In regards to the hot carrier dynamics, it is found that the phonon-phonon (ph-ph) coupling is much slower in dots than in rods and prisms while electron-phonon (e-ph) coupling is almost the same in these particles.

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Photostability of gold nanoparticles with different shapes: the role of Ag clusters

Cited by 56 publications

References 55 publications

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

NanoUV-VIS: An Interactive Visualization Tool for Monitoring the Evolution of Optical Properties of Nanoparticles Throughout Synthesis Reactions

Thermal Stability and Hot Carrier Dynamics of Gold Nanoparticles of Different Shapes

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