Synthesis and properties of new paramagnetic hybrid bayerite from Al(0)/naphthalene dianhydride reaction

Triboni, Eduardo Rezende; Silva, Mauro Francisco Pinheiro da; Finco, Alan Teruel; Rodrigues, Magali A.; Demets, Grégoire Jean-François; Dyszy, Fábio Henrique; Isolani, Paulo Celso; Filho, Pedro Berci; Politi, Mário José

doi:10.1590/s1516-14392010000400013

Cited by 8 publications

(6 citation statements)

References 54 publications

(75 reference statements)

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“…On the other hand, with higher ethanol amount, the formation of the gel was faster and the best condition was found to be H 2 O:EtOH 1:3 (v:v). These results point to similar pathway to those found in a previous work about ripening (dissolution-precipitation) of elemental aluminum in water-ethanol mixtures 40 . The aluminum consumption is dependent upon its own concentration, pH, nature, and type of base and its counter-ion, and stability of the aluminate species in the reaction media [51][52][53][54][55] .…”

Section: Synthetic Approachsupporting

confidence: 90%

“…As mentioned above (section 1), the aluminum oxidation in H 2 O-EtOH under sonication with a higher fraction of ethanol in aqueous mixture (i.e. 3:1, v:v) was essential to the faster precipitation of the aluminum trihydroxide (bayerite) 40 . As highlighted, the presence of d-glucose had a fundamental influence to achieve the POHA material since the bulk condition was the same, i.e., 1:3 water-ethanol.…”

Section: Synthetic Approachmentioning

confidence: 85%

“…In these context in a previous work aluminum oxidation in alkaline alcohol-water 3:1 (v:v) yielded a paramagnetic organic-bayerite material. It was shown the need of this high ethanolic fraction to the precipitation of the bayerite 40 .…”

Section: Introductionmentioning

confidence: 99%

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A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

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Mesoporous gamma-aluminas (γ-Al 2 O 3 ) were synthesized starting from an unusual precursor of polyoxohydroxide aluminum (POHA). This precursor was obtained from aluminum oxidation in alkaline water-ethanol solvent in the presence of d-glucose that induces the formation of a gel, which leads to the POAH powder after ethanolic treatment. Precipitated POHAs were calcined at different temperatures (300, 400, 700 and 900 °C) resulting in the metastable γ-Al 2 O 3 phase. Whereas at 300 °C no γ-Al 2 O 3 phase was formed, unexpectedly, mesoporous γ-Al 2 O 3 was obtained at 400 ºC having a high specific surface area (282 m 2 /g) and a narrow pore size distribution. At higher temperatures, the aluminas had the expected decrease in surface area: 166 m 2 /g (700 °C) and 129 m 2 /g (900 °C), respectively. The structural change from POHA to alumina calcined at 400 ºC occurs directly without the need to isolate the hydroxide or oxyhydroxide aluminum precursors. Both POHA and transition aluminas were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), N 2 sorption and Scanning Electron Microscopy (SEM). These findings show an alternative route to produce high standard aluminas.

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Section: Synthetic Approachsupporting

confidence: 90%

Section: Synthetic Approachmentioning

confidence: 85%

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A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

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“…For the NTCDA layer, the peaks at 1780 cm −1 (characteristic to the dianhidrydecarbonylic group [59]), at 543, 753 and 882 cm −1 (specific to the C-H out-of-plane bending vibrations [60,61]), at 698 and 754cm −1 (attributed to C-H bending vibration [36]), at 1044, 1120, 1161, 1234 and 1293 cm −1 (characteristic to the stretching vibration of C-O in the anhydride groups and the C-H in-plane bending vibration) and at 1442 and 1582 cm −1 due to the C-C bending [61]) were evidenced.…”

Section: Phthalocyanines and Some Current Applicationsmentioning

confidence: 99%

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Socol¹,

Preda²,

Stănculescu³

et al. 2017

Phthalocyanines and Some Current Applications

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Multilayer or blend heterostructures based on porphyrins and phthalocyanines were obtained on different substrates using VTE and MAPLE methods. Stacked structures based on ZnPc and C60 with NTCDA were prepared by VTE on ITO/glass, their current value being increased by the deposition of the materials in an inverted configuration or by using ITO/PEDOT:PSS as a substrate. Multilayer structures comprising ZnPc and NTCDA were fabricated by MAPLE on an AZO/glass. Treating the AZO in oxygen plasma, a higher current value was obtained for the deposited heterostructures. The oxygen plasma treatment can increase the work function of the AZO resulting in a decrease of the energetic barrier from AZO/organic interface and finally improving the charge transport. Stacked layers or blend heterostructures having ZnPc, MgPc and TPyP were deposited by MAPLE on ITO/PET. In the case of those containing MgPc and TPyP, an increase in the current value (in dark) was obtained for the blend compared to the stacked layer configuration. For those with ZnPc and TPyP, under illumination, a photovoltaic effect was observed for the blend structure. All heterostructures are featured by a large absorption in the visible domain of the solar spectrum and suitable electrical properties for their use in OPV applications.

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“…Since the last decade, thin films of molecular organic semiconductors are attracting much interest for electronic and optoelectronic applications [1]. Technologies such as organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs) and organic field-effect transistors (OFETs) have been steadily evolving and penetrating the mainstream consumer electronics market [2][3]. Organic device is more preferable because of easy fabrication.…”

Section: Introductionmentioning

confidence: 99%

Optical Characteristics of ITO/NTCDA Film for Defence Technology Application

Poad¹,

Demon²,

Yahya³

et al. 2018

IJCRSET

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The interface structure between inorganic/organic layer governed microscopic and physical property of many organic based devices. The 1,4,5,8-napthalenetetracarboxylic dianyhride (NTCDA) is strong electron acceptor and its thermal stability can be explored in electro-optics application and laser material. In this study, optical characteristics of NTCDA film at interface of indium tin oxide (ITO) was demonstrated. The film was processed using ethanol and toluene solvents at 1:1 ratio before spin coated on 180 nm thickness ITO substrate. Hexamethyldisilaze (HMDS) was used to surface functionalized the ITO substrate. Analysis of AFM images showed the NTCDA film grown on ITO substrate at grain size approximately 0.5-1.5 m. The onset of the absorption band shifted around 0.11 eV upon HMDS modification at interface of NTCDA film and ITO substrate indicating electronic modification on the bulk NTCDA film. Structural conformation was studied using the infrared absorption. Other than strong absorption peak at 1783 cm-1 that belonged to vibrational mode of the C = O functional group of the NTCDA, the fingerprint peaks of NTCDA on FTIR spectra were present with or without HMDS modification. This study showed the bandgap tuning of organic semiconductor film using surface functionalization technique as potential material processing in defence technology application.

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Synthesis and properties of new paramagnetic hybrid bayerite from Al(0)/naphthalene dianhydride reaction

Cited by 8 publications

References 54 publications

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Optical Characteristics of ITO/NTCDA Film for Defence Technology Application

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