Ultrafast dynamics at the zinc phthalocyanine/zinc oxide nanohybrid interface for efficient solar light harvesting in the near red region

Seddigi, Zaki S.; Ahmed, Saleh A.; Sardar, Samim; Pal, Samir Kumar

doi:10.1016/j.solmat.2015.06.026

Cited by 29 publications

(22 citation statements)

References 44 publications

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“…The fast decaying component (s 1 ) corresponds to electron transfer from the conduction band of the nanoparticle to rGO and the second term (s 2 ) is due to electron transition from an intermediate defect state to the valence band of the nanoparticle. 56,57 Interestingly, from Table 1 it is observed that the fast component for C1 is twice as much as that for C2 (0.50 ns vs. 0.26 ns) whereas the slow time scale is comparable for both. The decrease in the fast component signies a better transfer rate of photogenerated electrons to rGO in C2.…”

Section: Resultsmentioning

confidence: 90%

Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

et al. 2020

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Section: Resultsmentioning

confidence: 90%

Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

et al. 2020

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“…The fitting of the fluorescence transients was done using a nonlinear least-squares procedure, as reported in our previous publications. 42 − 44 For all light-activated experiments, a red light-emitting diode (LED) source (λ max = 640 nm and power = 3 mW/cm 2 ) was used.…”

Section: Methodsmentioning

confidence: 99%

NIR-Light-Active ZnO-Based Nanohybrids for Bacterial Biofilm Treatment

et al. 2018

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Nanomaterials with antimicrobial properties triggered by external stimuli appear to be a promising and innovative substitute for the destruction of antibiotic-resistant superbugs as they can induce multiple disruptions in the cellular mechanism. This study demonstrates the use of squaraine (SQ) dye as the photosensitive material, activated in the near-infrared tissue-transparent therapeutic window. The dye has been covalently attached to the ZnO nanoparticle surface, forming ZnO-SQ nanohybrids. The formation of the nanohybrids is confirmed using Fourier transform infrared and other optical spectroscopic methods. The photoinduced interfacial electron transfer process (as confirmed using the time-resolved fluorescence technique) from the excited state of SQ to the conduction band of ZnO is responsible for the greater reactive oxygen species (ROS) generation ability of the nanohybrid. The production of photoactivated ROS (especially singlet oxygen species) by ZnO-SQ provides remarkable antimicrobial action against clinically significant Staphylococcus aureus. Detailed investigations suggest synergistic involvement of cell membrane disruption and nanoparticle internalization followed by photoinduced intracellular ROS generation, which result in an unprecedented 95% bacterial killing activity by the nanohybrid. Moreover, the efficacy of the nanohybrid for disruption of bacterial biofilms has been examined. The electron microscopic images suggest significant bacterial cell death following structural alteration and reduced adherence property of the biofilms. Nanodimension-driven greater internalization of ZnO-SQ followed by an improved dissolution of ZnO in an acidic environment of the biofilm as well as red-light-driven interfacial charge separation and ROS generation improves the efficacy of the material for biofilm destruction. An artificial medical implant mimicking titanium sheets coated with ZnO-SQ depicts light-triggered disruption in the adherence property of matured biofilms. The cytotoxicity and hemolysis assays show inherent biocompatibility of the photoactive nanohybrid. This study is notably promising for the treatment of life-threatening drug-resistant infections and eradication of biofilms formed within artificial implants.

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“…Consequently, sensitizers are used to modify TiO 2 , so that it can be excited by visible light. Some of these sensitizers include azo,, hemicyanine,, perylene bisimide,, xanthene, porphyrin and pthalocyanine dyes. The latter two groups of chromophores show the best photosensitizing ability …”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Performance of Porphyrin/Phthalocyanine and Bis(4‐pyridyl)pyrrolidinofullerene modified Titania

et al. 2017

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Zinc(II), copper(II) and cobalt(II) metallated porphyrins/phthalocyanines and bis(4-pyridyl) pyrrolidinofullerene (9) were used in a supramolecular approach for the sensitization of titania. Spectral properties of the chromophores were examined in the solid state showing strong absorptions at 700 and 800 nm for porphyrins and phthalocyanines, respectively. The interaction between the chromophores and a dual ligand was investigated spectroscopically. Titania-based composites sensitized with 9 and cobaltous porphyrin exhibited the highest photocatalytic activity against both phenol and methylene blue under solar irradiation. Photodegradation intermediates were determined based on LC-UV-Vis-MS analysis. It is expected that the composites will be applied for remediation of aqueous environmental samples from transparent and colorful pollutants.[a] Dr.

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Ultrafast dynamics at the zinc phthalocyanine/zinc oxide nanohybrid interface for efficient solar light harvesting in the near red region

Cited by 29 publications

References 44 publications

Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

NIR-Light-Active ZnO-Based Nanohybrids for Bacterial Biofilm Treatment

Enhanced Photocatalytic Performance of Porphyrin/Phthalocyanine and Bis(4‐pyridyl)pyrrolidinofullerene modified Titania

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