Todas as Publicações do INCT-MI

@article{Mahapatra2023,

title = {Paramagnetic two-dimensional silicon-oxide from natural silicates},

author = {Preeti Lata Mahapatra and Caique Campos de Oliveira and Gelu Costin and Suman Sarkar and Pedro A. S. Autreto and Chandra Sekhar Tiwary},

url = {https://iopscience.iop.org/article/10.1088/2053-1583/ad10b9/meta},

doi = {10.1088/2053-1583/ad10b9},

issn = {2053-1583},

year  = {2023},

date = {2023-12-12},

urldate = {2024-01-01},

journal = {2D Mater.},

volume = {11},

number = {1},

publisher = {IOP Publishing},

abstract = {Abstract

               Silicon dioxide’s potential for having magnetic properties is fascinating, as combining its electronic capabilities with magnetic response seems promising for spintronics. In this work, the mechanisms that drive the change from diamagnetic behavior in pure silicates like SiO2 to paramagnetic behavior in transition metal-doped silicates like Rhodonite silicate (CaMn3Mn(Si5O15)) are explored. This naturally occurring Rhodonite (R)-silicate was thinned down while retaining its magnetic properties by liquid-phase scalable exfoliation. Exfoliating R-silicate into the two-dimensional (2D) structure by LPE increases magnetic coercivity, and the internal resistance to demagnetization (ΔHc) up to ∼23.95 Oe compared to 7.08 Oe for its bulk phase. DFT spin-polarized calculations corroborate those findings and explain that the origin of the magnetic moment comes mainly from the Mn in the doped 2D silicate due to the asymmetrical components of the Mn d and Si p states in the valence band. This result is further illustrated by the spin component differential charge densities showing that Mn and Si atoms display a residual up spin charge. Rhodonite’s unusual magnetic behavior has considerable potential for spintronics, data storage, and sensing technologies. Understanding the complex relationships between the structural, magnetic, and electronic properties of silicates is essential for developing new materials and composites as well as for driving future research.},

keywords = {Condensed Matter Physics, General Chemistry, General Materials Science, Mechanical Engineering, Mechanics of Materials},

pubstate = {published},

tppubtype = {article}

}

@article{Antonin2023,

title = {Sodium niobate microcubes decorated with ceria nanorods for hydrogen peroxide electrogeneration: An experimental and theoretical study},

author = {Vanessa S. Antonin and Lanna E.B. Lucchetti and Felipe M. Souza and Victor S. Pinheiro and João P.C. Moura and Aline B. Trench and James M. de Almeida and Pedro A. S. Autreto and Marcos R.V. Lanza and Mauro C. Santos},

url = {https://www.sciencedirect.com/science/article/abs/pii/S092583882302666X},

doi = {10.1016/j.jallcom.2023.171363},

issn = {0925-8388},

year  = {2023},

date = {2023-07-21},

urldate = {2023-11-00},

journal = {Journal of Alloys and Compounds},

volume = {965},

publisher = {Elsevier BV},

abstract = {The present work investigates the catalytic activity of NaNbO3 microcubes decorated with CeO2 nanorods on carbon (1 %, 3 %, 5 %, and 10 % w/w) for H2O2 electrogeneration. The crystalline phases and the morphology of the materials were identified with scanning electron microscopy, transmission electron microscopy, X‐ray diffraction and X-ray Photoelectronic spectroscopy. Contact angle measurements were performed to characterize the hydrophilicity of each material. The H2O2 electrogeneration was assessed by oxygen reduction reaction using the rotating ring-disk electrode technique. Electrochemical characterization results shown an enhancement on the H2O2 electrogeneration by NaNbO3 @CeO2/C-based materials compared to what was obtained with pure Vulcan XC72. The 1 % NaNbO3 @CeO2/C electrocatalyst presented the lower starting potential for the ORR and a 2.3 electron transfer, favoring the 2-electron mechanism and providing a higher H2O2 electrogeneration rate. Also, the enhancement of oxygen-containing functional groups showed the potential to comprehensively tune properties and optimize active sites and, consequently, increases the H2O2 electrogeneration. Density functional theory calculations indicated that NaNbO3 and CeO2 surfaces have a similar low theoretical overpotential for this reaction and that CeO2 improves the catalyst facilitating the electron transfer. These results indicate that NaNbO3 @CeO2/C-based electrocatalysts are promising materials for in situ H2O2 electrogeneration.},

keywords = {Materials Chemistry, Mechanical Engineering, Mechanics of Materials, Metals and Alloys},

pubstate = {published},

tppubtype = {article}

}

@article{Oliveira2023b,

title = {Optimized 2D nanostructures for catalysis of hydrogen evolution reactions},

author = {Caique Campos de Oliveira and Pedro A. S. Autreto},

doi = {10.1557/s43580-023-00549-7},

issn = {2059-8521},

year  = {2023},

date = {2023-06-00},

urldate = {2023-06-00},

journal = {MRS Advances},

volume = {8},

number = {6},

pages = {307--310},

publisher = {Springer Science and Business Media LLC},

keywords = {Condensed Matter Physics, General Materials Science, Mechanical Engineering, Mechanics of Materials},

pubstate = {published},

tppubtype = {article}

}

@article{Han2022,

title = {Orbital‐Hybridization‐Driven Charge Density Wave Transition in CsV_{3}Sb_{5} Kagome Superconductor},

author = {Shulun Han and Chi Sin Tang and Linyang Li and Yi Liu and Huimin Liu and Jian Gou and Jing Wu and Difan Zhou and Ping Yang and Caozheng Diao and Jiacheng Ji and Jinke Bao and Lingfeng Zhang and Mingwen Zhao and Milorad V. Milošević and Yanqun Guo and Lijun Tian and Mark B. H. Breese and Guanghan Cao and Chuanbing Cai and Andrew T. S. Wee and Xinmao Yin},

doi = {10.1002/adma.202209010},

issn = {1521-4095},

year  = {2023},

date = {2023-02-00},

journal = {Advanced Materials},

volume = {35},

number = {8},

publisher = {Wiley},

abstract = {AbstractOwing to its inherent non‐trivial geometry, the unique structural motif of the recently discovered kagome topological superconductor AV3Sb5 (A = K, Rb, Cs) is an ideal host of diverse topologically non‐trivial phenomena, including giant anomalous Hall conductivity, topological charge order, charge density wave (CDW), and unconventional superconductivity. Despite possessing a normal‐state CDW order in the form of topological chiral charge order and diverse superconducting gaps structures, it remains unclear how fundamental atomic‐level properties and many‐body effects including Fermi surface nesting, electron–phonon coupling, and orbital hybridization contribute to these symmetry‐breaking phenomena. Here, the direct participation of the V3d–Sb5p orbital hybridization in mediating the CDW phase transition in CsV3Sb5 is reported. The combination of temperature‐dependent X‐ray absorption and first‐principles studies clearly indicates the inverse Star‐of‐David structure as the preferred reconstruction in the low‐temperature CDW phase. The results highlight the critical role that Sb orbitals play and establish orbital hybridization as the direct mediator of the CDW states and structural transition dynamics in kagome unconventional superconductors. This is a significant step toward the fundamental understanding and control of the emerging correlated phases from the kagome lattice through the orbital interactions and provides promising approaches to novel regimes in unconventional orders and topology.},

keywords = {General Materials Science, Mechanical Engineering, Mechanics of Materials},

pubstate = {published},

tppubtype = {article}

}