Jorlandio Felix | Universidade de Brasília - UnB (original) (raw)

Papers by Jorlandio Felix

Journal of Hazardous Materials, 2021

Herein, we demonstrate a single-step synthesis of simple copper-doped borophosphate glasses and t... more Herein, we demonstrate a single-step synthesis of simple copper-doped borophosphate glasses and their unusual use for catalytic reduction of nitro groups from the aromatic nitro compounds. The copper-doped glasses were evaluated as an affordable heterogeneous catalytic glass-based material for the reduction of 4-nitrophenol by sodium borohydride. The glass matrix acts as a host and support material for in situ self-growth of zero-valent copper (Cu) nanoparticles (NPs) on the glass surface. Thus, zero-valent CuNPs are produced in situ on the glass surface that is accomplished by the interaction of copper ions with hydride ions. Using an intrinsic reaction kinetic constant, we find a catalytic activity of 0.144 L s-1 g-1 for a glass-based catalyst doped with a non-noble metal, which is an order of magnitude higher when compared to the values observed elsewhere. Furthermore, the reuse of glass catalyst after six successive cycles demonstrates an outstanding performance compared to that of the parent material. A mathematical model based on the Langmuir-Hinshelwood mechanism related to an empirical growth rate of the zero-valent CuNPs was proposed to describe the kinetic of the 4-nitrophenol catalytic hydrogenation.

Scientific Reports

Herein, we report the preparation of CuO@ borophosphate nanoparticles (CuOnano@glass) and their w... more Herein, we report the preparation of CuO@ borophosphate nanoparticles (CuOnano@glass) and their wide catalytic applications. The glass annealing, under a controlled atmosphere, enables the growth of copper nanoparticles on the glass surface (not within) by an uncommon bottom-up process. Following the thermal annealing of metallic nanoparticles under air atmosphere, supported copper oxide nanoparticles CuONPs on the glass surface can be obtained. The approach enables the glass matrix to be explored as a precursor and a route for the synthesis of supported copper-based nanoparticles in a solvent-free process without immobilization steps or stabilizing agents. In order to demonstrate the wide synthetic utility of this CuONPs glass-based catalyst, one-pot three-component domino reactions were performed under an air atmosphere, affording the desired selenylated oxadiazoles in good to excellent yields. We also extended the application of these new materials as a glass-based catalyst in th...

RSC Advances

The development of supported catalysts based on simple procedures without waste products and time... more The development of supported catalysts based on simple procedures without waste products and time-consuming steps is highly desirable.

Materials Science and Engineering: B

Nanoscale Horizons

This article reports the effects of gamma radiation on the structural, optical and magnetic prope... more This article reports the effects of gamma radiation on the structural, optical and magnetic properties of monolayer tungsten disulfide (WS2) grown by a scalable Van der Waals epitaxial (VdWE) process...

Journal of Alloys and Compounds

Journal of Materials Science: Materials in Electronics

Journal of Non-Crystalline Solids

Glasses are a class of materials that have a multitude of uses and applications. In catalysis, th... more Glasses are a class of materials that have a multitude of uses and applications. In catalysis, they are frequently used as support materials. However, in this paper, we demonstrate that glass can be applied as an active material in catalysis. The glass was successfully applied as catalysts in bioactive bis(indolyl)methanes (BIMs) molecules with the capability to extend the reaction substrate to other N-heterocycle. Furthermore, we describe the synthesis and characterization of cheap and readily available borophosphate glass samples produced using a classical melt-quenching technique and their application as a catalyst. The main features of this glass-catalyzed reaction are high yields, recyclable catalyst, ease of scale-up to gram scale, and a solvent-free and metal-free approach.

In this study, we report non-conventional silver nanoparticle growth on the surface of lead–germa... more In this study, we report non-conventional silver nanoparticle growth on the surface of lead–germanate oxide glasses. Thermal annealing at around the glass transition temperature (T g) under a nitrogen atmosphere enables the growth of silver thin films on the glass surface. The nanoparticle growth was monitored by scanning electron microscopy (SEM) and UV-visible spectroscopy as a function of the annealing time. The characteristic temperatures were obtained by differential thermal analysis (DTA) and the influence of the Ag + ion content on the glass stability (GS) parameters was evaluated. Additionally, the apparent activation energy of crystallization (E) was calculated. The silver thin films obtained after different annealing times were applied as a substrate for luminescence enhancement of the Eu(btfa) 3 $bipy rare earth europium complex. The catalytic activity of the Ag-doped glasses was tested for the reduction of p-nitrophenol in the presence of NaBH 4. The catalytic performanc...

Nature Communications

To fully exploit van der Waals materials and their vertically stacked heterostructures, new mass-... more To fully exploit van der Waals materials and their vertically stacked heterostructures, new mass-scalable production routes which are low cost but preserve the high electronic and optical quality of the single crystals are required. Here, we demonstrate an approach to realise a variety of functional heterostructures based on van der Waals nanocrystal films produced through the mechanical abrasion of bulk powders. We find significant performance enhancements in abraded heterostructures compared to those fabricated through inkjet printing of nanocrystal dispersions. To highlight the simplicity, applicability and scalability of the device fabrication, we demonstrate a multitude of different functional heterostructures such as resistors, capacitors and photovoltaics. We also demonstrate the creation of energy harvesting devices, such as large area catalytically active coatings for the hydrogen evolution reaction and enhanced triboelectric nanogenerator performance in multilayer films. The ease of device production makes this a promising technological route for up-scalable films and heterostructures.

Publicatio UEPG-Ciências Exatas e da …, 2009

Resumo Materiais supercondutores do tipo YBa 2Cu 3O 7-x (Y123) apresentam um grande potencial de ... more Resumo Materiais supercondutores do tipo YBa 2Cu 3O 7-x (Y123) apresentam um grande potencial de aplicações tecnológicas. Por outro lado, para atingir estas potencialidades estes materiais devem apresentar determinadas características que dependem ...

Journal of Materials Science, 2017

In this study, we present a new method for obtaining an effective catalytic system composed of gl... more In this study, we present a new method for obtaining an effective catalytic system composed of glass, with Cu or CuO nanoparticle growth on a glass matrix through bottom-up process. The system is based on active borophosphate glass material doped with Cu+ ions, which was obtained by a classical melt-quenching glass production technique. The thermal annealing of doped glasses under reductive/oxidative atmosphere enables the glassy material to act successfully as host material of both copper and copper oxide nanoparticles. We have investigated the structural and optical properties of the Cu0 and CuO nanostructures by using X-ray diffraction, scanning electron microscopy, electron paramagnetic resonance and Raman spectroscopy. Supported nanostructures with triangular and acicular shape were made without the necessity of chelating agents. The catalytic activity of these systems was efficiently tested for the reduction of p-nitrophenol in the presence of NaBH4, achieving a good rate constant around 2.8×10−3 and 7.3 ×10−3s−1 for Cu0 and CuO nanostructures, respectively. The catalyst was reused for three times without losing its activity significantly, simply taking and washing the pellet in fresh water, making these materials promising candidates for applications in the fields of catalysis.

Nanotechnology, Jan 27, 2017

InGaAs quantum wire (QWr) intermediate-band solar cell-based nanostructures grown by molecular be... more InGaAs quantum wire (QWr) intermediate-band solar cell-based nanostructures grown by molecular beam epitaxy are studied. The electrical and interface properties of these solar cell devices, as determined by current-voltage (I-V) and capacitance-voltage (C-V) techniques, were found to change with temperature over a wide range of 20-340 K. The electron and hole traps present in these devices have been investigated using deep-level transient spectroscopy (DLTS). The DLTS results showed that the traps detected in the QWr-doped devices are directly or indirectly related to the insertion of the Si δ-layer used to dope the wires. In addition, in the QWr-doped devices, the decrease of the solar conversion efficiencies at low temperatures and the associated decrease of the integrated external quantum efficiency through InGaAs could be attributed to detected traps E1QWR_D, E2QWR_D, and E3QWR_D with activation energies of 0.0037, 0.0053, and 0.041 eV, respectively.

The Journal of Physical Chemistry C, 2016

Journal of Crystal Growth, 2015

Post-growth annealing treatments in the range 400-600 1C are performed on GaSb/GaAs Interfacial M... more Post-growth annealing treatments in the range 400-600 1C are performed on GaSb/GaAs Interfacial Misfit grown samples. Current density-voltage (J-V), Capacitance-voltage (C-V), capacitance-frequency (C-F) and Deep Level Transient Spectroscopy (DLTS) measurements are performed on as-grown and annealed samples. Our studies show that possible defect compensation is observed with the annealing treatments, resulting in a significant improvement in the performances of the devices.

ACS applied materials & interfaces, Jan 2, 2015

Photoluminescent Lanthanide-Organic Frameworks (Ln-MOFs) were printed onto plastic and paper foil... more Photoluminescent Lanthanide-Organic Frameworks (Ln-MOFs) were printed onto plastic and paper foils with a conventional Inkjet printer. Ln-MOF inks were used to reproduce color images that can be only observed under a UV light irradiation. This approach opens up a new window to explore Ln-MOF materials in technological applications, such as optical devices (e.g. lab-on-a-chip), proof of authenticity for official documents.

Journal of the Brazilian Chemical Society, 2015