Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes

Stănculescu, Anca; Socol, Marcela; Rasoga, Oana; Breazu, C.; Preda, N.; Stanculescu, Florin; Socol, G.; Vacareanu, Loredana; Gîrtan, Mihaela; Doroshkevich, Aleksandr

doi:10.3390/ma14247688

Cited by 4 publications

(2 citation statements)

References 82 publications

(96 reference statements)

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“…Thus, in the P0 sample, the TPyP signature consists of: an intense narrow B band with a maximum at ~430 nm (allowing electronic transitions between π-π* orbitals of the porphyrin ring [ 72 ]) and a Q band with a maximum at ~520 nm (transitions to the first excited singlet state [ 72 ]). Generally, TPyP presents several Q sub-bands [ 73 ], the symmetry of the molecule being responsible for their number [ 72 ]. Thus, another barely visible maximum at ~550 nm can be identified in P3 and P4 samples that contain the same TPyP amount as the P0 sample.…”

Section: Resultsmentioning

confidence: 99%

Macrocyclic Compounds: Metal Oxide Particles Nanocomposite Thin Films Deposited by MAPLE

et al. 2023

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Nanocomposite films based on macrocyclic compounds (zinc phthalocyanine (ZnPc) and 5,10,15,20-tetra(4-pyridyl) 21H,23H-porphyrin (TPyP)) and metal oxide nanoparticles (ZnO or CuO) were deposited by matrix-assisted pulsed laser evaporation (MAPLE). 1,4-dioxane was used as a solvent in the preparation of MAPLE targets that favor the deposition of films with a low roughness, which is a key feature for their integration in structures for optoelectronic applications. The influence of the addition of ZnO nanoparticles (~20 nm in size) or CuO nanoparticles (~5 nm in size) in the ZnPc:TPyP mixture and the impact of the added metal oxide amount on the properties of the obtained composite films were evaluated in comparison to a reference layer based only on an organic blend. Thus, in the case of nanocomposite films, the vibrational fingerprints of both organic compounds were identified in the infrared spectra, their specific strong absorption bands were observed in the UV–Vis spectra, and a quenching of the TPyP emission band was visible in the photoluminescence spectra. The morphological analysis evidenced agglomerated particles on the composite film surface, but their presence has no significant impact on the roughness of the MAPLE deposited layers. The current density–voltage (J-V) characteristics of the structures based on the nanocomposite films deposited by MAPLE revealed the critical role played by the layer composition and component ratio, an improvement in the electrical parameters values being achieved only for the films with a certain type and optimum amount of metal oxide nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Macrocyclic Compounds: Metal Oxide Particles Nanocomposite Thin Films Deposited by MAPLE

et al. 2023

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“…The presence of these surface defects can act as physical traps for free electrons, which will block the recombination and therefore decrease the NBE emission intensity [67][68][69]. Nevertheless, the intensity of fluorescence spectra for ZnO containing composites is much lower than previously reported for free ZnO NPs, indicating the presence of strong surface interactions between nanoparticles and the polymer matrix [70,71].…”

Section: Photoluminescence Spectroscopymentioning

confidence: 94%

Antimicrobial Packaging for Plum Tomatoes Based on ZnO Modified Low-Density Polyethylene

Motelica,

Ficai,

Oprea

et al. 2024

IJMS

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Food safety and quality are major concerns in the food industry. Despite numerous studies, polyethylene remains one of the most used materials for packaging due to industry reluctance to invest in new technologies and equipment. Therefore, modifications to the current materials are easier to implement than adopting whole new solutions. Antibacterial activity can be induced in low-density polyethylene films only by adding antimicrobial agents. ZnO nanoparticles are well known for their strong antimicrobial activity, coupled with low toxicity and UV shielding capability. These characteristics recommend ZnO for the food industry. By incorporating such safe and dependable antimicrobial agents in the polyethylene matrix, we have obtained composite films able to inhibit microorganisms’ growth that can be used as packaging materials. Here we report the obtaining of highly homogenous composite films with up to 5% ZnO by a melt mixing process at 150 °C for 10 min. The composite films present good transparency in the visible domain, permitting consumers to visualize the food, but have good UV barrier properties. The composite films exhibit good antimicrobial and antibiofilm activity from the lowest ZnO composition (1%), against both Gram-positive and Gram-negative bacterial strains. The homogenous dispersion of ZnO nanoparticles into the polyethylene matrix was assessed by Fourier transform infrared microscopy and scanning electron microscopy. The optimal mechanical barrier properties were obtained for composition with 3% ZnO. The thermal analysis indicates that the addition of ZnO nanoparticles has increased thermal stability by more than 100 °C. The UV-Vis spectra indicate a low transmittance in the UV domain, lower than 5%, making the films suitable for blocking photo-oxidation processes. The obtained films proved to be efficient packaging films, successfully preserving plum (Rome) tomatoes for up to 14 days.

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Study of the surface topography and optical properties of ZnO and AZO, CZO, and CAZO thin films (in room temperature and annealed at 500 °C)

Rahimi

Dalouji

2022

Molecular Crystals and Liquid Crystals

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Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes

Cited by 4 publications

References 82 publications

Macrocyclic Compounds: Metal Oxide Particles Nanocomposite Thin Films Deposited by MAPLE

Macrocyclic Compounds: Metal Oxide Particles Nanocomposite Thin Films Deposited by MAPLE

Antimicrobial Packaging for Plum Tomatoes Based on ZnO Modified Low-Density Polyethylene

Study of the surface topography and optical properties of ZnO and AZO, CZO, and CAZO thin films (in room temperature and annealed at 500 °C)

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