@article{Barcelos2024,

title = {Selection Criteria for Solvent and Coagulation Medium to Modulate the Structure of Polymethylmethacrylate Prepared by Wet Phase Inversion},

author = {Gustavo F. J. Barcelos and Andre S. Ferlauto and Katia C. S. Figueiredo},

url = {https://periodicos.ufms.br/index.php/orbital/article/view/18700},

doi = {10.17807/orbital.v15i5.18700},

issn = {1984-6428},

year  = {2024},

date = {2024-05-02},

urldate = {2024-05-02},

journal = {Orbital: Electron. J. Chem.},

pages = {17--25},

publisher = {Instituto de Quimica - Univ. Federal do Mato Grosso do Sul},

abstract = {Polymethylmethacrylate, PMMA, with sponge or finger pores are interesting depending on the application. Our goal was to investigate parameters (Φ and Φ’) to foresee the morphology of PMMA prepared by phase inversion based on chemical composition (amount and type of solvent, non-solvent and surfactant). A literature survey was conducted with different chemical composition and analyzed by statistical tools. Sponge-like structures were obtained in systems whose Φ value is less than 0.22 or the Φ’ value is more than 0.55. Both indexes can differentiate to some extent systems that generate finger-like structures from those that generate sponge-like ones.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Machado2024,

title = {Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells},

author = {Marina Machado and Lays N. Rodrigues and Vanessa B. Vilela and Tamara S. Moraes and Andre S. Ferlauto and Fabio C. Fonseca},

url = {https://pubs.acs.org/doi/abs/10.1021/acsaem.3c02757},

doi = {10.1021/acsaem.3c02757},

issn = {2574-0962},

year  = {2024},

date = {2024-02-16},

urldate = {2024-03-11},

journal = {ACS Appl. Energy Mater.},

volume = {7},

number = {5},

pages = {1766--1776},

publisher = {American Chemical Society (ACS)},

abstract = {Matching the catalytic activity of nanostructured materials and processing parameters for high-temperature electrochemical devices is a challenge. Controlling the nanoparticle shape has been proposed as an alternative method to stabilize crystalline surfaces to inhibit particle coarsening and sustain catalytic activity after high-temperature treatment. In this study, nickel-based catalysts supported on shape-controlled (nanorods and nanocubes) gadolinium-doped cerium oxide (GDC) were evaluated for the steam reforming reaction of ethanol, aiming at direct ethanol solid oxide fuel cells (SOFC). The morphology of the support was shown to have an important role in the catalytic activity, particularly when heat treatments for fuel cell fabrication are considered. The Ni catalyst supported on the GDC nanorods sustained the highest catalytic activity after heat treatment despite the morphology change of the support at high temperatures. The excellent properties of the shape-controlled materials were demonstrated in SOFC using the Ni-GDC catalytic layer tailored for the operation on anhydrous ethanol at 700 °C. The fuel cell exhibited a stable performance for more than 100 h of continuous operation without any sign of degradation due to carbon deposition. Such a result is an important step toward the stable operation of direct ethanol intermediate temperature solid oxide fuel cells.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Amarante2023,

title = {Carbon nanotube-cellulose ink for rapid solvent identification},

author = {Tiago Amarante and Thiago H R Cunha and Claudio Laudares and Ana P M Barboza and Ana Carolina dos Santos and Cíntia L Pereira and Vinicius Ornelas and Bernardo R A Neves and Andre S. Ferlauto and Rodrigo G Lacerda},

url = {https://www.beilstein-journals.org/bjnano/articles/14/44},

doi = {10.3762/bjnano.14.44},

issn = {2190-4286},

year  = {2023},

date = {2023-04-26},

urldate = {2023-04-26},

journal = {Beilstein J. Nanotechnol.},

volume = {14},

pages = {535--543},

publisher = {Beilstein Institut},

abstract = {In this work, a conductive ink based on microfibrillated cellulose (MFC) and multiwalled carbon nanotubes (MWCNTs) was used to produce transducers for rapid liquid identification. The transducers are simple resistive devices that can be easily fabricated by scalable printing techniques. We monitored the electrical response due to the interaction between a given liquid with the carbon nanotube–cellulose film over time. Using principal component analysis of the electrical response, we were able to extract robust data to differentiate between the liquids. We show that the proposed liquid sensor can classify different liquids, including organic solvents (acetone, chloroform, and different alcohols) and is also able to differentiate low concentrations of glycerin in water (10–100 ppm). We have also investigated the influence of two important properties of the liquids, namely dielectric constant and vapor pressure, on the transduction of the MFC-MWCNT sensors. These results were corroborated by independent heat flow measurements (thermogravimetric analysis). The proposed MFC-MWCNT sensor platform may help paving the way to rapid, inexpensive, and robust liquid analysis and identification.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Trindade2022,

title = {Tuning of Shape, Defects, and Disorder in Lanthanum-Doped Ceria Nanoparticles: Implications for High-Temperature Catalysis},

author = {Fabiane J. Trindade and Sergio Damasceno and Larissa Otubo and Marissol R. Felez and Daniel Zanetti de Florio and Fabio C. Fonseca and Andre S. Ferlauto},

url = {https://pubs.acs.org/doi/abs/10.1021/acsanm.2c00942},

doi = {10.1021/acsanm.2c00942},

issn = {2574-0970},

year  = {2022},

date = {2022-07-22},

urldate = {2022-07-22},

journal = {ACS Appl. Nano Mater.},

volume = {5},

number = {7},

pages = {8859--8867},

publisher = {American Chemical Society (ACS)},

abstract = {The design of nanomaterials by tailoring the size, shape, and surface chemistry has a significant impact on their properties. The fine-tuning of structural defects of ceria rod-like and cube-like-shaped nanoparticles was performed via La3+ doping in molar ratios of 0–70 mol %. Morphology control was achieved by varying the hydrothermal synthesis temperature. For LaxCe1–xO2–x/2 samples prepared at 110 °C, nanorod-like structures are obtained for x < 0.30 and a random morphology of interconnecting polyhedra is achieved for a larger x. The ceria fluorite crystalline structure is maintained at an x of up to 0.60, and both Raman and X-ray diffraction results indicate a high level of defects and disorder in the crystalline structure. For LaxCe1–xO2–x/2 samples prepared at 180 °C, cube-shaped particles are predominant for an x of up to 0.10; however, for x> 0.20, two fluorite phases with different lattice parameters are associated with two distinct shapes, cubes and rods The La concentration in nanocubes is limited to x = 0.10 even for samples prepared with higher nominal La concentrations, whereas the nanorods contain larger La concentrations. The demonstrated morphology and defect control on La-doped ceria nanoparticles are critical for applications such as high-temperature oxide catalysts.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Damasceno2022,

title = {Oxidative coupling of methane in chemical looping design},

author = {Sergio Damasceno and Fabiane J. Trindade and Fabio C. Fonseca and Daniel Z. de Florio and Andre S. Ferlauto},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0378382022000959},

doi = {10.1016/j.fuproc.2022.107255},

issn = {0378-3820},

year  = {2022},

date = {2022-06-00},

urldate = {2022-06-00},

journal = {Fuel Processing Technology},

volume = {231},

publisher = {Elsevier BV},

abstract = {The search for alternative non‑carbon-emitting uses of the huge reserves of natural gas has renewed the interest on direct conversion of methane to value added chemicals. Oxidative coupling of methane (OCM) is a key potential route to convert methane directly to ethylene and innumerous works have focused on the study and development of catalysis for such reaction. Despite these efforts, the limited yield and selectivity achieved still hinders the industrial deployment of such reactions. In this work, we provide a mini-review on studies that focus on OCM process based on the chemical looping (CL) concept, in which methane and oxygen are fed in two separated cyclic steps and a metal oxide catalyst is used as the oxygen source to activate the methane molecule. CL emerges as a promising design for viable methane conversion by improving selectivity due to the use lattice oxygen species for methane activation, avoiding undesired combustion gas phase reactions triggered by molecular oxygen. We review all classes of catalyst tested in this approach, including single oxides, doped and co-doped systems based on Mg-single bondMn oxides, rare earths, Mn-Na2WO4, and perovskites, and most recent optimization of reactor operation conditions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Damasceno2022b,

title = {Oxidative coupling of methane in chemical looping design},

author = {Sergio Damasceno and Fabiane J. Trindade and Fabio C. Fonseca and Daniel Zanetti de Florio and Andre S. Ferlauto},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0378382022000959?via%3Dihub},

doi = {10.1016/j.fuproc.2022.107255},

issn = {0378-3820},

year  = {2022},

date = {2022-06-00},

urldate = {2022-06-00},

journal = {Fuel Processing Technology},

volume = {231},

publisher = {Elsevier BV},

abstract = {The search for alternative non‑carbon-emitting uses of the huge reserves of natural gas has renewed the interest on direct conversion of methane to value added chemicals. Oxidative coupling of methane (OCM) is a key potential route to convert methane directly to ethylene and innumerous works have focused on the study and development of catalysis for such reaction. Despite these efforts, the limited yield and selectivity achieved still hinders the industrial deployment of such reactions. In this work, we provide a mini-review on studies that focus on OCM process based on the chemical looping (CL) concept, in which methane and oxygen are fed in two separated cyclic steps and a metal oxide catalyst is used as the oxygen source to activate the methane molecule. CL emerges as a promising design for viable methane conversion by improving selectivity due to the use lattice oxygen species for methane activation, avoiding undesired combustion gas phase reactions triggered by molecular oxygen. We review all classes of catalyst tested in this approach, including single oxides, doped and co-doped systems based on Mg-single bondMn oxides, rare earths, Mn-Na2WO4, and perovskites, and most recent optimization of reactor operation conditions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pereira2022,

title = {Aerosol-Printed MoS2 Ink as a High Sensitivity Humidity Sensor},

author = {Neuma M. Pereira and Natália P. Rezende and Thiago H. R. Cunha and Ana P. M. Barboza and Glaura G. Silva and Daniel Lippross and Bernardo R. A. Neves and Hélio Chacham and Andre S. Ferlauto and Rodrigo G. Lacerda},

url = {https://pubs.acs.org/doi/full/10.1021/acsomega.1c06525},

doi = {10.1021/acsomega.1c06525},

issn = {2470-1343},

year  = {2022},

date = {2022-03-22},

urldate = {2022-03-22},

journal = {ACS Omega},

volume = {7},

number = {11},

pages = {9388--9396},

publisher = {American Chemical Society (ACS)},

abstract = {Molybdenum disulfide (MoS2) is attractive for use in next-generation nanoelectronic devices and exhibits great potential for humidity sensing applications. Herein, MoS2 ink was successfully prepared via a simple exfoliation method by sonication. The structural and surface morphology of a deposited ink film was analyzed by scanning electron microscopy (SEM), Raman spectroscopy, and atomic force microscopy (AFM). The aerosol-printed MoS2 ink sensor has high sensitivity, with a conductivity increase by 6 orders of magnitude upon relative humidity increase from 10 to 95% at room temperature. The sensor also has fast response/recovery times and excellent repeatability. Possible mechanisms for the water-induced conductivity increase are discussed. An analytical model that encompasses two ionic conduction regimes, with a percolation transition to an insulating state below a low humidity threshold, describes the sensor response successfully. In conclusion, our work provides a low-cost and straightforward strategy for fabricating a high-performance humidity sensor and fundamental insights into the sensing mechanism.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Thyssen2021,

title = {Direct Conversion of Methane to C2 Hydrocarbons in Solid-State Membrane Reactors at High Temperatures},

author = {Vivian Vazquez Thyssen and Vanessa Bezerra Vilela and Daniel Zanetti de Florio and Andre S. Ferlauto and Fabio Coral Fonseca},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.chemrev.1c00447},

doi = {10.1021/acs.chemrev.1c00447},

issn = {1520-6890},

year  = {2021},

date = {2021-12-28},

urldate = {2022-02-09},

journal = {Chem. Rev.},

volume = {122},

number = {3},

pages = {3966--3995},

publisher = {American Chemical Society (ACS)},

abstract = {Direct conversion of methane to C2 compounds by oxidative and nonoxidative coupling reactions has been intensively studied in the past four decades; however, because these reactions have intrinsic severe thermodynamic constraints, they have not become viable industrially. Recently, with the increasing availability of inexpensive “green electrons” coming from renewable sources, electrochemical technologies are gaining momentum for reactions that have been challenging for more conventional catalysis. Using solid-state membranes to control the reacting species and separate products in a single step is a crucial advantage. Devices using ionic or mixed ionic–electronic conductors can be explored for methane coupling reactions with great potential to increase selectivity. Although these technologies are still in the early scaling stages, they offer a sustainable path for the utilization of methane and benefit from the advances in both solid oxide fuel cells and electrolyzers. This review identifies promising developments for solid-state methane conversion reactors by assessing multifunctional layers with microstructural control; combining solid electrolytes (proton and oxygen ion conductors) with active and selective electrodes/catalysts; applying more efficient reactor designs; understanding the reaction/degradation mechanisms; defining standards for performance evaluation; and carrying techno-economic analysis.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Palhares2021,

title = {Oxygen vacancy engineering of TaOx-based resistive memories by Zr doping for improved variability and synaptic behavior},

author = {João H Quintino Palhares and Yann Beilliard and Fabien Alibart and Everton Bonturim and Daniel Z de Florio and Fabio C Fonseca and Dominique Drouin and Andre S. Ferlauto},

url = {https://iopscience.iop.org/article/10.1088/1361-6528/ac0e67},

doi = {10.1088/1361-6528/ac0e67},

issn = {1361-6528},

year  = {2021},

date = {2021-10-01},

urldate = {2021-10-01},

journal = {Nanotechnology},

volume = {32},

number = {40},

publisher = {IOP Publishing},

abstract = {Resistive switching (RS) devices are promising forms of non-volatile memory. However, one of the biggest challenges for RS memory applications is the device-to-device (D2D) variability, which is related to the intrinsic stochastic formation and configuration of oxygen vacancy (VO) conductive filaments (CFs). In order to reduce the D2D variability, control over the formation and configuration of oxygen vacancies is paramount. In this study, we report on the Zr doping of TaOx-based RS devices prepared by pulsed-laser deposition as an efficient means of reducing the VO formation energy and increasing the confinement of CFs, thus reducing D2D variability. Our findings were supported by XPS, spectroscopic ellipsometry and electronic transport analysis. Zr-doped films showed increased VO concentration and more localized VOs, due to the interaction with Zr. DC and pulse mode electrical characterization showed that the D2D variability was decreased by a factor of seven, the resistance window was doubled, and a more gradual and monotonic long-term potentiation/depression in pulse switching was achieved in forming-free Zr:TaOx devices, thus displaying promising performance for artificial synapse applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Vivas2021b,

title = {Chemical vapor deposition graphene transfer onto asymmetric PMMA support},

author = {Vinícius Henrique Vivas and Marcelo Costa Flores and Wander Pereira Jesus and Andre S. Ferlauto and Thiago Henrique Rodrigues Da Cunha and Katia Cecília De Souza Figueiredo},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/app.51590},

doi = {10.1002/app.51590},

issn = {1097-4628},

year  = {2021},

date = {2021-09-07},

urldate = {2022-02-05},

journal = {J of Applied Polymer Sci},

volume = {139},

number = {5},

publisher = {Wiley},

abstract = {Graphene is a promising material for membrane applications. However, the graphene production with large specific area and good structural quality is a challenge. Therefore, the production and characterization of composite membranes with graphene grown by chemical vapor deposition (CVD) over a porous polymethylmethacrylate (PMMA) substrate was investigated. The experimental strategy consisted in applying CVD-graphene on a PMMA surface using PMMA-assisted graphene wet transfer. The proposed methodology resulted in large-area membranes with 2 cm diameter. The samples were characterized by Raman spectroscopy, indicating the presence of graphene in good quality and relative structural integrity. The analysis by scanning electron microscopy revealed the formation of a microporous support with an asymmetric structure. The gas permeation measurements of graphene/PMMA membranes showed a permeability reduction of 81.9% for CO2 and 83.7% for N2. The contribution of PMMA to flow resistance was 2% and 11% for CO2 and N2, respectively, and the contribution of graphene was 98% and 89% for CO2 and N2. Therefore, this research presents a potential advance in transferring graphene to porous support, and the impermeability process of membranes composed of graphene/PMMA, a fundamental step for the development of graphene membranes before the production of controlled-sized pores.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gomes2021,

title = {Characterization and application of niobium-doped titanium dioxide thin films prepared by sol–gel process},

author = {Gustavo Henrique M. Gomes and Magnum A. M. L. de Jesus and Andre S. Ferlauto and Marcelo M. Viana and Nelcy D. S. Mohallem},

url = {https://link.springer.com/article/10.1007/s00339-021-04781-6},

doi = {10.1007/s00339-021-04781-6},

issn = {1432-0630},

year  = {2021},

date = {2021-08-00},

urldate = {2021-08-00},

journal = {Appl. Phys. A},

volume = {127},

number = {8},

publisher = {Springer Science and Business Media LLC},

abstract = {Pure and Nb-doped TiO2 crystalline thin films with different molar ratios of niobium were produced by sol–gel process using the dip-coating method. The results of X-ray diffractometry analysis using Rietveld refinement confirmed the presence of the anatase phase and the partial substitution of Ti4+ by Nb5+ in the [TiO6] octahedra, since changes in the lattice parameters, crystalline strain and crystallite size were observed. The occupation of niobium atoms at the Ti4+ sites and an increase in the oxygen content were also determined. Atomic force microscopy analyses showed a uniform and homogeneous surface morphology and high-resolution transmission microscopy showed agglomerated nanoparticles. Nanoindentation and ellipsometry techniques evidenced that the insertion of Nb in the TiO2 matrix caused an increase in density and hardness (~ 18%) values and a reduction in the root mean square (RMS) values (30 and 75% of reduction for 3% and 1% Nb/TiO2). Nb-doped TiO2 thin films showed better performance in the photodegradation of methylene blue, reaching a degradation rate of 44% after 4 h of testing, against 26% for pure TiO2 thin film. The reaction rate was almost twice as high for the doped thin film, with a half-life time of 285 min versus 529 min for pure TiO2 film.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Vivas2021,

title = {Process of production of CVD graphene membrane for desalination and water treatment: a review of experimental research results},

author = {Vinícius Henrique Vivas and Thiago Henrique Rodrigues da Cunha and Andre S. Ferlauto and Kátia Cecília de Souza Figueiredo},

url = {https://link.springer.com/article/10.1007/s43153-021-00119-0},

doi = {10.1007/s43153-021-00119-0},

issn = {1678-4383},

year  = {2021},

date = {2021-06-14},

urldate = {2021-09-00},

journal = {Braz. J. Chem. Eng.},

volume = {38},

number = {3},

pages = {423--434},

publisher = {Springer Science and Business Media LLC},

abstract = {The increase in water consumption and the reduction of its resources generated a need to create advanced treatment technologies. The development of a membrane process for water desalination and purification has gained importance to ensure human consumption and industrial requirements. CVD graphene membranes are being considered one of the most promising alternative for desalination and water treatment. The development of graphene technology will allow the rise of a new class of membranes. The first studies indicated a high potential increase in flux and selectivity, as well as mechanical resistance and antifouling properties, as compared to commercial polyamide thin-film composite membranes. A literature review has been performed to elucidate the main concepts and techniques reported in experimental works aiming at the development of composite membranes with a selective graphene layer over a porous substrate for water desalination. The bottleneck of production steps were highlighted: chemical vapor deposition of graphene, transfer of graphene films, defect minimization and the production of pores with controlled sizes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{CarvalhoRibeiro2021,

title = {From thin films to shaped platelets: effects of temperature gradient on SnS synthesis},

author = {Thiago Carvalho Ribeiro and Myriano H. Oliveira and R. Magalhães-Paniago and Andre S. Ferlauto},

url = {https://www.sciencedirect.com/science/article/abs/pii/S004060902030715X},

doi = {10.1016/j.tsf.2020.138507},

issn = {0040-6090},

year  = {2021},

date = {2021-03-00},

urldate = {2021-03-00},

journal = {Thin Solid Films},

volume = {721},

publisher = {Elsevier BV},

abstract = {In this work, we studied the synthesis and properties of SnS thin films and platelets obtained by vapor phase deposition under controlled pressure. Two morphological types are obtained in the same process depending on the absolute temperature and the temperature gradient inside the reactor. The growth of isolated platelets is favored by a small temperature gradient between the sublimation and deposition regions of the deposition chamber. Films are formed when there is a large temperature gradient. Raman spectroscopy and energy dispersive spectroscopy analysis were used to identify the phase of the synthesized samples, and polarized Raman spectroscopy and X-ray diffraction analysis helped us confirm the crystallographic orientation of the isolated platelets. We have carried out studies on the crystallographic shape and orientation of orthorhombic isolated platelets using optical microscopy, scanning electron microscopy and surface energies of the crystalline planes of SnS.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}