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Denis PA, Laranjeira JAS, Sambrano JR. Covalent functionalization of germanene employing computational simulations. Phys Chem Chem Phys 2024; 26:13140-13151. [PMID: 38629240 DOI: 10.1039/d4cp00476k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Computational simulations through density functional theory in conjunction with M06-L and HSE functional have been carried out to investigate the chemical reactivity of the germanene monolayer. It is exceptionally reactive, with an average reaction energy of -60.4 kcal mol-1 for the nineteen functional groups considered: H, F, Cl, Br, O, S, Se, Ge, OH, SH, CH3, CF3, NH, NH2, C6H5, C6H4, CCl2, CBr2, and the azomethine ylide. The results indicate that oxygen is the most reactive reagent (-96.9 kcal mol-1), followed by fluorine (-83.1 kcal mol-1). Germanene presents a rich organic chemistry, and functionalization with azomethine ylides, benzynes, and carbenes can be easily accomplished as indicated by the reaction energies computed, which lie between -45 and -65 kcal mol-1. Furthermore, germanene is significantly more reactive than graphene and hexagonal boron nitride monolayers since the reaction energy for germanene is more than 40 kcal mol-1 lower. Although, in general, germanene is slightly more reactive than black and blue phosphorene and less prone to oxidation, but its oxidation when exposed to air occurs spontaneously. The addition of functional groups works cooperatively. The reaction energies become lower as the number of functional groups increases, thus favouring the agglomeration of functional groups attached unless the steric effect alters this pattern. Finally, we analyzed the electronic properties of functionalized germanene. It is possible to fine-tune the band gap of germanene from 0.1 to 2 eV using different functional groups and coverages. For O-50% and S-50% functionalized germanene, we found that carrier recombination is the most difficult due to the considerable differences between the effective masses of holes and electrons, which is promising for optical applications.
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Affiliation(s)
- Pablo A Denis
- Computational Nanotechnology, DETEMA, Facultad de Química, UDELAR, CC 1157, 11800 Montevideo, Uruguay.
| | - Jose A S Laranjeira
- Modeling and Molecular Simulation Group, Sao Paulo State University (UNESP), 17033-360 Bauru, SP, Brazil
| | - Julio R Sambrano
- Modeling and Molecular Simulation Group, Sao Paulo State University (UNESP), 17033-360 Bauru, SP, Brazil
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Macchi C, Petinardi GM, Freire LA, Castro MS, Aldao CM, Luiz TM, Moura F, Simões AZ, Moreno H, Longo E, Somoza A, Assis M, Ponce MA. Tracking of structural defects induced by Eu-doping in β-Ag 2MoO 4: their influences on electrical properties. Dalton Trans 2024; 53:525-534. [PMID: 38051257 DOI: 10.1039/d3dt03385f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
In this study, several methods were employed to investigate the electrical characteristics of β-Ag2MoO4 systems, both Eu-doped and undoped, synthesized using the microwave-assisted hydrothermal method. The focus extended to understanding how synthesis time influences material defects, with doping fixed at 1%. A systematic shift in the silver vacancy (VAg) concentration was observed within the doped β-Ag2MoO4 system. Specifically, this study demonstrated that the incorporation of Eu3+ into polycrystalline β-Ag2MoO4 initially increases the VAg concentration. However, as the synthesis time progresses, the VAg concentration decreases, resulting in alterations in the resulting electrical properties, arising from the intricate interplay between the number of grain boundaries and carrier density. By combining information obtained from photoluminescence, positron annihilation lifetime spectroscopy, and impedance spectroscopy, a comprehensive conduction mechanism was formulated, shedding light on both doped and undoped β-Ag2MoO4 systems.
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Affiliation(s)
- Carlos Macchi
- Institute of Materials Physics of Tandil, IFIMAT (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Tandil, Argentina
| | | | - Leonardo Almeida Freire
- Functional Materials Development Group (GDMaF), Federal University of Itajubá, (UNIFEI), Itajubá, Brazil
| | - Miriam Susana Castro
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Mar del Plata, Argentina
| | - Celso Manuel Aldao
- Institute of Scientific and Technological Research in Electronics (ICYTE), University of Mar del Plata and National Research Council (CONICET), Mar del Plata, Argentina
| | - Thaís Marcial Luiz
- Advanced Materials Interdisciplinary Laboratory (LIMAV), Federal University of Itajubá (UNIFEI), Itabira, Brazil
| | - Francisco Moura
- Advanced Materials Interdisciplinary Laboratory (LIMAV), Federal University of Itajubá (UNIFEI), Itabira, Brazil
| | | | - Henrique Moreno
- School of Engineering and Sciences, São Paulo State University (UNESP), Guaratinguetá, Brazil
- CDMF, Federal University of São Carlos (UFSCar), São Carlos, Brazil
| | - Elson Longo
- CDMF, Federal University of São Carlos (UFSCar), São Carlos, Brazil
| | - Alberto Somoza
- Institute of Materials Physics of Tandil, IFIMAT (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Tandil, Argentina
| | - Marcelo Assis
- Department of Physical and Analytical Chemistry, University Jaume I (UJI) Castellón, Spain.
| | - Miguel Adolfo Ponce
- Institute of Materials Physics of Tandil, IFIMAT (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Tandil, Argentina
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Fast and efficient green synthesis of CaWO4 NPs using eggshells as a biogenic calcium source: structure, optical property, and morphology. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Lopes FHP, Noleto LFG, Vieira VEM, de Sousa PB, Jucá ACS, Oliveira YL, Costa KRBS, Almeida MAP, Gouveia AF, Cavalcante LS. Experimental and Theoretical Correlation of Modulated Architectures of β-Ag2MoO4 Microcrystals: Effect of Different Synthesis Routes on the Morphology, Optical, Colorimetric, and Photocatalytic Properties. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02509-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Evaluation of reactive oxygen species and photocatalytic degradation of ethylene using β-Ag2MoO4/g-C3N4 composites. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Tang X, Li H, Zhang T, Zhong J, Du H. P123-assisted hydrothermal synthesis of Ag2MoO4 with enhanced photocatalytic performance. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Hasse Palharim P, Lara Diego dos Reis Fusari B, Ramos B, Otubo L, Silva Costa Teixeira AC. Effect of HCl and HNO3 on the synthesis of pure and silver-based WO3 for improved photocatalytic activity under sunlight. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113550] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Vishnevetskii DV, Averkin DV, Efimov AA, Lizunova AA, Ivanova AI, Pakhomov PM, Ruehl E. Ag/α-Ag 2MoO 4/h-MoO 3 nanoparticle based microspheres: synthesis and photosensitive properties. SOFT MATTER 2021; 17:10416-10420. [PMID: 34792080 DOI: 10.1039/d1sm01315g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We report a new and the most simple strategy for the synthesis of silver molybdate functional composite microspheres based on low molecular weight gelators -amino acids, silver salts and heptamolybdate ions. The resulting material shows a high photocatalytic activity with respect to the methylene blue dye degradation at neutral pH.
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Affiliation(s)
- Dmitry V Vishnevetskii
- Department of Physical Chemistry and Applied Physics, Tver State University (TSU), Tver, 170100, Russia.
- Institute of Biomedical Chemistry (IBMC), Moscow, 119121, Russia
| | - Dmitry V Averkin
- Department of Physical Chemistry and Applied Physics, Tver State University (TSU), Tver, 170100, Russia.
- Department of Physicochemical Measurements, Russian Metrological Institute of Technical Physics and Radio Engineering, Mendeleevo, 141570, Russia
| | - Alexey A Efimov
- Moscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, Russia
| | - Anna A Lizunova
- Moscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, Russia
| | - Alexandra I Ivanova
- Department of Physical Chemistry and Applied Physics, Tver State University (TSU), Tver, 170100, Russia.
| | - Pavel M Pakhomov
- Department of Physical Chemistry and Applied Physics, Tver State University (TSU), Tver, 170100, Russia.
| | - E Ruehl
- Department of Physical Chemistry, Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, 14195, Germany
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Structural, morphological and photoluminescence properties of β-Ag2MoO4 doped with Eu3+. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-020-01489-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Della Rocca DG, Peralta RM, Peralta RA, Peralta Muniz Moreira RDF. Recent development on Ag2MoO4-based advanced oxidation processes: a review. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-01934-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Kajana T, Velauthapillai D, Shivatharsiny Y, Ravirajan P, Yuvapragasam A, Senthilnanthanan M. Structural and photoelectrochemical characterization of heterostructured carbon sheet/Ag2MoO4-SnS/Pt photocapacitor. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112784] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Pachauri N, Lakshmi GBVS, Sri S, Gupta PK, Solanki PR. Silver molybdate nanoparticles based immunosensor for the non-invasive detection of Interleukin-8 biomarker. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 113:110911. [PMID: 32487373 DOI: 10.1016/j.msec.2020.110911] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 03/14/2020] [Accepted: 03/31/2020] [Indexed: 12/14/2022]
Abstract
In this study, we report the silver molybdate nanoparticles (β-Ag2MoO4 NPs) based non-invasive and sensitive electrochemical immunosensor for label-free detection of Interleukin-8 (IL-8) biomarker. The X-ray diffraction and Raman spectroscopy studies confirm the cubic spinel structures of β-Ag2MoO4 NPs. High-resolution transmission electron microscopy study depicted average size of β-Ag2MoO4 NPs as 27.15 nm. The cleaned indium tin oxide coated glass substrates were coated with spin-coated thin films of Ag2MoO4 NPs. These electrodes used for covalently immobilization of antibodies specific to IL-8 (Anti-IL-8) using EDC-NHS chemistry and unbound activated sites blocked by bovine serum albumin. Electrochemical response was obtained in the range of 1 fg mL-1 to 40 ng mL-1 and the sensitivity was found to be 7.03 μA ng-1mL cm-2 with LOD of 90 pg mL-1. Spiked samples prepared by human saliva were tested and found efficient detection with this immunoelectrode.
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Affiliation(s)
- Namrata Pachauri
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Smriti Sri
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Pramod K Gupta
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India.
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Unvealing the role of β-Ag 2MoO 4 microcrystals to the improvement of antibacterial activity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110765. [PMID: 32279798 DOI: 10.1016/j.msec.2020.110765] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 01/14/2020] [Accepted: 02/18/2020] [Indexed: 12/29/2022]
Abstract
Crystal morphology with different surfaces is important for improving the antibacterial activity of materials. In this experimental and theoretical study, the antibacterial activity of β-Ag2MoO4 microcrystals against the Gram-positive bacteria, namely, methicillin-resistant Staphylococcus aureus (MRSA), and the Gram-negative bacteria, namely, Escherichia coli (E. coli), was investigated. In this study, β-Ag2MoO4 crystals with different morphologies were synthetized by a simple co-precipitation method using three different solvents. The antimicrobial efficacy of the obtained microcrystals against both bacteria increased according to the solvent used in the following order: water < ammonia < ethanol. Supported by experimental evidence, a correlation between morphology, surface energy, and antibacterial performance was established. By using the theoretical Wulff construction, which was obtained by means of density functional calculations, the morphologies with large exposition of the (001) surface exhibited superior antibacterial activity. This study provides a low cost route for synthesizing β-Ag2MoO4 crystals and a guideline for enhancing the biological effect of biocides on pathogenic bacteria by the morphological modulation.
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Liu J, Yang B, Gao M, You L, Zhang Y, Li Z, Guo L, Li T, Chen P, Liu M. Facile synthesis of new polyhedron-like WO3/butterfly-like Ag2MoO4 p–n junction photocatalysts with higher photocatalytic activity in UV/solar region light. NEW J CHEM 2020. [DOI: 10.1039/c9nj05801j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A series of novel efficient polyhedron-like WO3/butterfly-like Ag2MoO4 p–n junction photocatalysts (denoted as AMW-x) were designed and synthesized.
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Bosi F. Chemical and structural variability in cubic spinel oxides. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2019; 75:279-285. [PMID: 32830753 DOI: 10.1107/s2052520619002282] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/12/2019] [Indexed: 11/10/2022]
Abstract
The empirical relations between cubic spinel oxides of different compositions were investigated using data from 349 refined crystal structures. The results show that the spinel structure is able to tolerate many constituents (at least 36) by enlarging and decreasing the tetrahedra and octahedra. This is reflected in a large variation in tetrahedral and octahedral bond distances. The oxygen positional parameter (u) may be regarded as a measure of the distortion of the spinel structure from cubic close packing or of the angular distortion of the octahedron. The distortion can best be explained in terms of ionic potential (IP), which merges the size and charge properties of an ion. Sterically induced distortion depends on ion size, whereas electrostatically induced distortion is caused by cation-cation repulsion across faces of tetrahedra and shared edges of octahedra. The strong correlations between the u parameter and the IP at the T and M sites are consistent with the main role played by the both charge and size. Large distortions (u ≫ 0.27) result in oxygen-oxygen distances of the octahedron shorter than 2.50 Å, which would lead to structural instability because of increased non-bonded repulsion forces between the oxygen atoms.
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Affiliation(s)
- Ferdinando Bosi
- Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, Rome RM 00185, Italy
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