Photophysical properties gallium octacarboxy phthalocyanines conjugated to CdSe@ZnS quantum dots

Tshangana, Charmaine; Nyokong, Tebello

doi:10.1016/j.saa.2015.06.086

Cited by 9 publications

(4 citation statements)

References 48 publications

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“…In some cases, the cadmium ion from QD can be incorporated into the macrocycle of metal-free PS upon HC formation [ 62 , 64 ]. It was noted [ 65 ] that the magnitude of the changes in the optical properties of PS increases with the size of the QD crystal. The presence of the ZnS protective shell is expected to reduce the effect of the heavy metal atoms in the QD core on the properties of PS.…”

Section: The Complexation Strategiesmentioning

confidence: 99%

“…Second, this HC potentially remains more stable in the presence of biological objects and environments. Therefore, there is a keen interest in covalently stabilized conjugates of PSs and nanoparticles [ 53 , 65 , 94 , 95 , 96 , 97 , 98 , 99 , 100 ].…”

Section: The Complexation Strategiesmentioning

confidence: 99%

“…Formation of a covalent bond can be easily monitored by the emergence of corresponding lines in the Raman spectra or absorption spectra in the IR region [ 65 , 94 , 96 ]. Meanwhile, it is difficult to control the PS : LNP ratio in the end product when routine crosslinking methods are used.…”

Section: The Complexation Strategiesmentioning

confidence: 99%

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Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

et al. 2021

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Increasing the efficiency of the photodynamic action of the dyes used in photodynamic therapy is crucial in the field of modern biomedicine. There are two main approaches used to increase the efficiency of photosensitizers. The first one is targeted delivery to the object of photodynamic action, while the second one is increasing the absorption capacity of the molecule. Both approaches can be implemented by producing dyenanoparticle conjugates. In this review, we focus on the features of the latter approach, when nanoparticles act as a light-harvesting agent and nonradiatively transfer the electronic excitation energy to a photosensitizer molecule. We will consider the hybrid photosensitizerquantum dot complexes with energy transfer occurring according to the inductive-resonance mechanism as an example. The principle consisting in optimizing the design of hybrid complexes is proposed after an analysis of the published data; the parameters affecting the efficiency of energy transfer and the generation of reactive oxygen species in such systems are described.

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Section: The Complexation Strategiesmentioning

confidence: 99%

Section: The Complexation Strategiesmentioning

confidence: 99%

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Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

et al. 2021

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“…CdSe based core-shell type quantum dots (QDs) exhibit novel properties making them attractive from both experimental and theoretical point of view [5][6][7][8][9][10][11][12]. It has been shown that coating core semiconductor with larger band gap of its kind, improve properties of nanocrystals (NCs) [13,14]. However, it is believed that lattice mismatch between the core and shell affects structural and optical properties such as band gap energy and size in core and shell [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Interfacial strain and shell thickness effect on core squeeze/stretch in core/shell quantum dots

2020

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Large surface to volume ratio in zero dimension core/shell quantum dots makes lattice mismatch induced interfacial strain vital in determining structural and optical properties of nanostructures. In this study, changes in lattice mismatch induced strain from different compressive shell (CdS-ZnS) with different thicknesses (thin and thick) are evaluated and its effect on capped core diameter is theoretically calculated. Capped core squeeze amount is compared with its initial (bare) diameter obtained from transmission electron microscopy. The capped core diameter is first calculated theoretically using effective mass approximation. Then, same diameter is obtained from modified version of effective mass approximation method that considers interfacial strain amount. Comparison of the results with bare core size obtained from transmission electron microscopy revealed effect of shell thickness imposed on capped core diameter. Results show, larger lattice mismatch between core and shell induces higher strain amount on the core thereby larger squeezes the core. At the meantime, it is shown that, thicker compressive shell enforces lower stress on core as it widens its distance from core due to lattice relaxation. Hence, core is squeezes less under thicker shell.

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Asymmetrically tetra-substituted phthalocyanine derivatives: synthesis, photophysical and photochemical properties

et al. 2022

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Photophysical properties gallium octacarboxy phthalocyanines conjugated to CdSe@ZnS quantum dots

Cited by 9 publications

References 48 publications

Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

Interfacial strain and shell thickness effect on core squeeze/stretch in core/shell quantum dots

Asymmetrically tetra-substituted phthalocyanine derivatives: synthesis, photophysical and photochemical properties

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