Visible light transformation of Rhodamine 6G using tetracarbazole zinc phthalocyanine when embedded in electrospun fibers and in the presence of ZnO and Ag particles

Khoza, Phindile; Nyokong, Tebello

doi:10.1080/00958972.2015.1013944

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…Upon excitation with visible light, an electron–hole pair is formed in the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the Pc (route 1 in Fig. 18 A) [64, 65]. In ferrites, upon exposure to visible light, an electron–hole pair is formed in the conduction band (CB) and valence band (VB) respectively (route 2 in Fig.…”

Section: Resultsmentioning

confidence: 99%

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Mapukata

Osifeko

Nyokong

2019

Heliyon

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Bifunctional nanocomposites based on zinc phthalocyanines and glutathione capped CoFe 2 O 4 magnetic nanoparticles (GSH-CoFe 2 O 4 MNPs) are applied in a binary system wherein simultaneous photooxidation of methyl orange (MO) and photoreduction of Cr (VI) are conducted. The photoactivity of two zinc Pcs with different functional moieties are compared based on their interactions with GSH-CoFe 2 O 4 MNPs. Conjugation of the Pcs to the GSH-CoFe 2 O 4 MNPs not only enhanced their singlet oxygen production but also their photocatalytic activity in both photooxidation and photoreduction experiments. Using electron paramagnetic resonance (EPR) spectroscopy, the Pc-MNP conjugates reported herein were found to exhibit superparamagnetic behaviour, giving the advantage of easy separation using an external magnetic field post application, an attractive attribute for heterogeneous catalysis. The catalysts reported herein are therefore good candidates as catalysts for real life water purification analyses as they facilitate the treatment of both organic and inorganic water pollutants.

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Section: Resultsmentioning

confidence: 99%

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Mapukata

Osifeko

Nyokong

2019

Heliyon

Self Cite

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“…The absorption spectrum of the monoclinic structure (α-form) has a doublet around 708 and 653 nm, while in the tricyclic spectrum of the (β-form) a high intensity band is observed at 646 nm with two shoulders at 620 and 665 nm [51]. Finally, the B-band is within the UV region of the spectrum, at around 340 nm [6,28,29,30], and it refers to the electronic n- π * transitions between the molecules. The B-band is due to a2u(π)→eg(π*) together with b2u(π)→eg(π*) transitions [52,53].…”

Section: Resultsmentioning

confidence: 99%

“…Electrospun fibres, as a support material, have been used by Mafukidze et al and resulted in a lack of mechanical strength, which polyamides membranes employed in this work may possess [ 11 ]. Therefore, introducing MPcs as molecular materials whiting a polymer, such as Nylon 11, could promote outstanding and effective properties in membrane applications and cause them to remain intact in the fiber [ 11 , 24 , 25 , 26 , 27 , 28 , 29 ]. We report in this communication the fabrication of semiconductor membranes consisting of MgPc-allenes particles dispersed in Nylon 11 films.…”

Section: Introductionmentioning

confidence: 99%

New Development of Membrane Base Optoelectronic Devices

et al. 2017

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It is known that one factor that affects the operation of optoelectronic devices is the effective protection of the semiconductor materials against environmental conditions. The permeation of atmospheric oxygen and water molecules into the device structure induces degradation of the electrodes and the semiconductor. As a result, in this communication we report the fabrication of semiconductor membranes consisting of Magnesium Phthalocyanine-allene (MgPc-allene) particles dispersed in Nylon 11 films. These membranes combine polymer properties with organic semiconductors properties and also provide a barrier effect for the atmospheric gas molecules. They were prepared by high vacuum evaporation and followed by thermal relaxation technique. For the characterization of the obtained membranes, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to determine the chemical and microstructural properties. UV-ViS, null ellipsometry, and visible photoluminescence (PL) at room temperature were used to characterize the optoelectronic properties. These results were compared with those obtained for the organic semiconductors: MgPc-allene thin films. Additionally, semiconductor membranes devices have been prepared, and a study of the device electronic transport properties was conducted by measuring electrical current density-voltage (J-V) characteristics by four point probes with different wavelengths. The resistance properties against different environmental molecules are enhanced, maintaining their semiconductor functionality that makes them candidates for optoelectronic applications.

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“…Finally, the membranes were analyzed, after subjecting them to accelerated lighting conditions, in order to determine their stability with radiation and their possible application in molecular electronics. Introducing MPcs into Nylon-11 could give outstanding and effective properties in membrane applications [19,[26][27][28][29][30][31]. Some examples of these applications include use as photosensitizers [32,33], for photocatalytic reactions [19,34], or as separation membranes by their permselectivity [35], although the information about the manufacture of semiconductor membranes that could be used in electronic devices as diodes (OLED) or organic transistors (OFET) is scarce.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hybrid Membranes Containing Nylon-11 and Organic Semiconductor Particles with Potential Applications in Molecular Electronics

et al. 2019

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Chemical degradation is a major disadvantage in the development of organic semiconductors. This work proposes the manufacture and characterization of organic semiconductor membranes in order to prevent semiconductor properties decreasing. Semiconductor membranes consisting of Nylon-11 and particles of π-conjugated molecular semiconductors were manufactured by high-vacuum evaporation followed by thermal relaxation. Initially, and with the aim of obtaining semiconductor particles, bulk heterojunction (BHJ) was carried out using green chemistry techniques between the zinc phthalocyanine (ZnPc) and the zinc hexadecafluoro-phthalocyanine (F 16 ZnPc) as n-type molecular semiconductors with the p-type molecular semiconductor dibenzotetrathiafulvalene (DBTTF). Consequently, the π-conjugated semiconductors particles were embedded in a Nylon-11 matrix and characterized, both structurally and considering their optical and electrical properties. Thin films of these materials were manufactured in order to comparatively study the membranes and precursor semiconductor particles. The membranes presented bandgap (E g ) values that were lower than those obtained in the films, which is an indicator of an improvement in their semiconductor capacity. Finally, the membranes were subjected to accelerated lighting conditions, to determine the stability of the polymer and the operating capacity of the membrane. After fatigue conditions, the electrical behavior of the proposed semiconductor membranes remained practically unaltered; therefore, they could have potential applications in molecular electronics. The chemical stability of membranes, which did not degrade in their polymer compound, nor in the semiconductor, was monitored by IR spectroscopy.

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Visible light transformation of Rhodamine 6G using tetracarbazole zinc phthalocyanine when embedded in electrospun fibers and in the presence of ZnO and Ag particles

Cited by 18 publications

References 34 publications

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

New Development of Membrane Base Optoelectronic Devices

Fabrication of Hybrid Membranes Containing Nylon-11 and Organic Semiconductor Particles with Potential Applications in Molecular Electronics

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