Effect of zinc oxide incorporation on the morphology of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanomaterials

Uthirakumar, Periyayya; Suh, Eun‐Kyung; Hong, Chang–Hee

doi:10.1016/j.tsf.2008.01.007

Cited by 16 publications

(3 citation statements)

References 31 publications

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“…Avoiding the photo-excited state's internal conversion and intersystem crossing mechanisms originates from the increased PL emission observed in MDMO-PPV: ZnO NPs blends [42,60]. The findings of this study are consistent with prior research [57].…”

Section: Photoluminescence Spectrasupporting

confidence: 90%

“…In addition, the confinement effect of ZnO NPs over MDMO-PPV molecules can enhance PL emission. ZnO NPs protect the polymer and immobilize it within their confined space [56,57]. This metal oxide will serve as a shield to suppress the interaction among the MDMO-PPV molecules, reducing self-quenching in the excited state.…”

Section: X-ray Diffraction (Xrd) Measurementsmentioning

confidence: 99%

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Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Abdelaziz,

Mustapha,

Bedja

et al. 2023

Nanomaterials

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The purpose of the presented study is to examine the impact of zinc oxide nanoparticles (ZnO NPs) on the spectrum features of poly [2-methoxy-5-(3′,7′-dimethyloctyloxy)-1, 4-phenylenevinylene] (MDMO-PPV). The characteristics of the MDMO-PPV and doped ZnO NPS samples were assessed using several techniques. A set of solutions of MDMO-PPV in toluene that were doped with different ratio percentages of ZnO NPs was prepared to obtain thin films. Pristine and composite solutions were spin-coated on glass substrates. It was observed that MDMO-PPV had two distinct absorbance bands at 310 and 500 nm in its absorption spectrum. The UV-Vis spectrum was dramatically changed when 5% of ZnO NPs were added. The result showed a significant reduction in absorption of the band 500 nm, while 310 nm absorption increased rapidly and became more pronounced. Upon adding (10%) ZnONPs to the sample, no noticeable change was observed in the 500 nm band. However, the 310 nm band shifted towards the blue region. There is a dominant peak in the PL spectrum of MDMO-PPV in its pristine form around 575 nm and a smaller hump around 600 nm of the spectrum. The spectral profile at 600 nm and the intensity of both bands are improved by raising the ZnO NP concentration. These bands feature two vibronic transitions identified as (0-0) and (0-1). When the dopant concentration increased to the maximum dopant percentage (10%), the energy band gap values increased by 0.21 eV compared to the pristine MDMO-PPV. In addition, the refractive index (n) decreased to its lowest value of 2.30 with the presence of concentrations of ZnO NPs.

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Section: Photoluminescence Spectrasupporting

confidence: 90%

Section: X-ray Diffraction (Xrd) Measurementsmentioning

confidence: 99%

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Abdelaziz,

Mustapha,

Bedja

et al. 2023

Nanomaterials

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“…Therefore, in order to improve the stability and photoluminescence intensity of composites, we all considered using polymerization to synthesize composites. [11,12]. Herein, we report the synthesis of novel core-shell Alq 3 /PPy composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of 8-Hydroxyquinoline Aluminum/Polypyrrole Core-Shell Composites

Song

Han

et al. 2016

J. Photopol. Sci. Technol.

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In this paper, 8-hydroxyquinoline aluminum/polypyrrole (Alq 3 /PPy) core-shell composites were prepared via in situ chemical oxidative polymerization with ammonium persulfate (APS) as oxidizer and hydrochloric acid (HCl) as dopant. The structure and properties of PPy, Alq 3 and Alq 3 /PPy composites have been studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The electrical conductivity of Alq 3 /PPy composites were evaluated using ohmmeter. It is found that the Alq 3 /PPy composites is successfully synthesized via in situ oxidative polymerization. The results of thermogravimetric analysis showed that relatively good thermal stability of Alq 3 /PPy composites. Furthermore, the probable formation mechanism of Alq 3 /PPy core-shell structure composites were also proposed on the basis of the experimental results.

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Improved luminescence intensity and stability of thermal annealed ZnO incorporated Alq3 composite films

Cuba

Muralidharan

2015

J Fluoresc

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The 30 wt% of ZnO (weight percentage of ZnO has been optimised) incorporated tris- (8-hydroxyquinoline)aluminum (Alq3) has been synthesised and coated on to glass substrates using dip coating method. The structural and optical properties of the Alq3/ZnO composite film after thermal annealing from 50 to 300 °C insteps 50° has been studied and reported. XRD pattern reveals the presence of crystalline ZnO in all the annealed films. The films annealed above 150 °C reveal the presence of crystalline Alq3 along with crystalline ZnO. The FTIR spectra confirm the presence of hydroxyquinoline and ZnO vibration in all the annealed composite films. The composite films annealed above 150 °C show a partial sublimation and degradation of hydroxyquinoline compounds. The ZnO incorporated composite films (Alq3/ZnO) exhibit two emission peaks, one corresponding to ZnO at 487 nm and another at 513 nm due to Alq3. The films annealed at 200 °C exhibit maximum photoluminescence (PL) intensity than pristine film at 513 nm when excited at 390 nm.

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Effect of zinc oxide incorporation on the morphology of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanomaterials

Cited by 16 publications

References 31 publications

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Preparation and Characterization of 8-Hydroxyquinoline Aluminum/Polypyrrole Core-Shell Composites

Improved luminescence intensity and stability of thermal annealed ZnO incorporated Alq3 composite films

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