Browsing by Subject "Gold nanorods"

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Open Access
Controlled singlet oxygen generation via plasmonic heating of gold nanorods
(2015-08) Karataş, Tuğçe
Photodynamic therapy (PDT) is the up-and-coming and developing methodology in order to treat various cancer tissues. The success of therapeutic action is directly related to the presence of cytotoxic singlet oxygen (SO) in tumor tissues. However, the feasibility of PDT is bounded by two major factors, hypoxia and the requirement of incident light penetration through cancer tissue. With these considerations, we have combined aromatic endoperoxides and gold nanorods so as to accomplish the possible restrictions. In this project, we synthesized and characterized both PEGylated anthracenic endoperoxides and gold nanorods separately and then further characterization was achieved for the combination of gold nanorods and aromatic endoperoxides. We have successfully proved that the thermal decomposition of endoperoxide molecule was carried out by irradiation of gold nanorods that resulted in the generation of both singlet and molecular oxygen.
Open Access
Luminescence of Gold Nanorod-Quantum Dots Complexes
(World Scientific Publishing Company, 2019) Trotsiuk, L. L.; Muravitskaya, A. O.; Kulakovich, O. S.; Gaponenko, S. V.; Demir, Hilmi Volkan
The photoluminescence of gold nanorod-quantum dots complexes was investigated in order to find optimal conditions for the luminescence enhancing. The number of quantum dots and polyelectrolyte layers on the gold nanorod surface in these complexes were considered as main factors in the enhancement.
Open Access
Plasmon-enhanced fluorescence in gold nanorod-quantum dot coupled systems
(Institute of Physics Publishing, 2020) Trotsiuk, L.; Muravitskaya, A.; Kulakovich, O.; Guzatov, D.; Ramanenka, A.; Kelestemur, Yusuf; Demir, Hilmi Volkan; Gaponenko, S.
Plasmon–exciton coupling is of great importance to many optical devices and applications. One of the coupling manifestations is plasmon-enhanced fluorescence. Although this effect is demonstrated in numerous experimental and theoretical works, there are different particle shapes for which this effect is not fully investigated. In this work electrostatic complexes of gold nanorods and CdSe/CdZnS quantum dots were studied. Double-resonant gold nanorods have an advantage of the simultaneous enhancement of the absorption and emission when the plasmon bands match the excitation and fluorescence wavelengths of an emitter. A relationship between the concentration of quantum dots in the complexes and the enhancement factor was established. It was demonstrated that the enhancement factor is inversely proportional to the concentration of quantum dots. The maximal fluorescence enhancement by 10.8 times was observed in the complex with the smallest relative concentration of 2.5 quantum dots per rod and approximately 5 nm distance between them. Moreover, the influence of quantum dot location on the gold nanorod surface plays an important role. Theoretical study and experimental data indicate that only the position near the nanorod ends provides the enhancement. At the same time, the localization of quantum dots on the sides of the nanorods leads to the fluorescence quenching.