Gold nanorods as multifunctional probes in a liquid crystalline DNA matrix

Olesiak‐Bańska, Joanna; Gordel, Marta; Matczyszyn, Katarzyna; Shynkar, Vasyl; Zyss, Joseph; Samoć, Marek

doi:10.1039/c3nr03319h

Cited by 24 publications

(21 citation statements)

References 40 publications

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“…Optical measurements of gold nanoparticles, such as characterization of nonlinear optical properties (e.g. with Z-scan technique 18 ) or imaging by two-photon microscopy, 19 require information concerning the stability of nanorods illuminated with pulsed laser beams. Moreover, the long-term stability of NRs is needed for various nanorod applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Post-synthesis reshaping of gold nanorods using a femtosecond laser

Gordel

Olesiak‐Bańska

Matczyszyn

et al. 2014

Phys. Chem. Chem. Phys.

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This work describes the interaction between femtosecond laser pulses (~130 fs, 800 nm) and gold nanorods (NRs) leading to reshaping of the NRs. We focus on the investigation of structural changes of the NRs and the parameters influencing the reshaping, like surface modification using sodium sulphide, laser power and the position of the longitudinal surface plasmon resonance band (l-SPR) with respect to the laser wavelength. A thermogravimetric analysis experiment is performed to examine changes in the composition of NRs upon heating. A new type of banana-shaped NPs is described and the conditions of their appearance are discussed.

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Section: Introductionmentioning

confidence: 99%

Post-synthesis reshaping of gold nanorods using a femtosecond laser

Gordel

Olesiak‐Bańska

Matczyszyn

et al. 2014

Phys. Chem. Chem. Phys.

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“…The same conclusions concerning the formation and appearance of a columnar hexagonal phase with a periodic zigzag pattern in dried droplets of DNA solution doped with gold NRs were previously drawn by our research group. 11 Thermal stability of DNA LCs Polarized light microscopy (PLM) is one of the most common tools used for the investigation of liquid crystalline phases, which allows differentiation between various LC textures and also the study and observation of phase transitions as a function of temperature. Transformation between different mesophases is the result of the order parameter change.…”

Section: Columnar Hexagonal Phasesmentioning

confidence: 99%

“…[10][11][12][13][14] It is still quite an unexplored area of research, where so far De Sio et al proved that DNA LCs were able to organize gold NRs within DNA LCs deposited on a glass substrate by drop casting and allowed to dry, 10 and Yevdokimov et al showed the formation of linear clusters of small gold nanopartciles (with diameter around 2 nm) in a cholesteric liquid crystalline dispersion of DNA. 14 However, the properties of a composite material consisting of gold NRs with strong plasmon resonances dispersed in DNA lyotropic LCs prepared in closed glass cells, where the type of observed phases and molecular organization are different compared to previously mentioned DNA LCs, [10][11][12][13][14] have not been studied in detail yet. Lacaze et al showed that it is possible to order small nanoparticles using smectic LCs 15 and our intent was to check this ability for DNA LCs, but it is necessary to evaluate the basic properties of DNA LC-nanoparticle hybrid systems first.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of DNA liquid crystals on doping with gold nanorods

Brach

Matczyszyn

Olesiak‐Bańska

et al. 2016

Phys. Chem. Chem. Phys.

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We report on the impact of doping with gold nanorods (NRs) on the formation and stability of DNA liquid crystals (LCs). Cetyl trimethylammonium (CTAB)-stabilized gold NRs were synthesized using the wet chemistry method. Different textures of cholesteric and columnar mesophases, as well as phase transitions, were observed using a polarized light microscope. It was found that liquid crystalline phases formed in the samples were qualitatively the same and the phase appearance sequence was preserved in the samples regardless of the doping. We show that depending on the concentration of gold NRs present in the phase, nanoparticle-doped cholesteric and columnar hexagonal phases existed in wider temperature ranges compared to pure DNA LCs. The potential applications of these liquid crystal-nanoparticle hybrid systems may include the fabrication of new optoelectronic devices and sensors.

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“…Plasmonic gold nanoparticles (AuNPs), gold nanoclusters, and Au(I) complexes have distinct optical features as a result of their differences in size, structure, and bonding. Therefore, understanding Nanomaterials 2019, 9, 933 2 of 13 the photodynamics will help to deepen the understanding of their electronic structures and optical properties [2,7,9,12,[16][17][18]. The electron dynamics of plasmonic gold nanoparticles has been intensively investigated [19,20].…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoclusters: Bridging Gold Complexes and Plasmonic Nanoparticles in Photophysical Properties

Zhou

Higaki

et al. 2019

Nanomaterials

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Recent advances in the determination of crystal structures and studies of optical properties of gold nanoclusters in the size range from tens to hundreds of gold atoms have started to reveal the grand evolution from gold complexes to nanoclusters and further to plasmonic nanoparticles. However, a detailed comparison of their photophysical properties is still lacking. Here, we compared the excited state behaviors of gold complexes, nanolcusters, and plasmonic nanoparticles, as well as small organic molecules by choosing four typical examples including the Au10 complex, Au25 nanocluster (1 nm metal core), 13 diameter Au nanoparticles, and Rhodamine B. To compare their photophysical behaviors, we performed steady-state absorption, photoluminescence, and femtosecond transient absorption spectroscopic measurements. It was found that gold nanoclusters behave somewhat like small molecules, showing both rapid internal conversion (<1 ps) and long-lived excited state lifetime (about 100 ns). Unlike the nanocluster form in which metal–metal transitions dominate, gold complexes showed significant charge transfer between metal atoms and surface ligands. Plasmonic gold nanoparticles, on the other hand, had electrons being heated and cooled (~100 ps time scale) after photo-excitation, and the relaxation was dominated by electron–electron scattering, electron–phonon coupling, and energy dissipation. In both nanoclusters and plasmonic nanoparticles, one can observe coherent oscillations of the metal core, but with different fundamental origins. Overall, this work provides some benchmarking features for organic dye molecules, organometallic complexes, metal nanoclusters, and plasmonic nanoparticles.

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Gold nanorods as multifunctional probes in a liquid crystalline DNA matrix

Cited by 24 publications

References 40 publications

Post-synthesis reshaping of gold nanorods using a femtosecond laser

Post-synthesis reshaping of gold nanorods using a femtosecond laser

Stabilization of DNA liquid crystals on doping with gold nanorods

Gold Nanoclusters: Bridging Gold Complexes and Plasmonic Nanoparticles in Photophysical Properties

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