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Araujo FDV, Silva FWN, Zhang T, Zhou C, Lin Z, Perea-Lopez N, Rodrigues SF, Terrones M, Souza Filho AG, Alencar RS, Viana BC. Substrate-Induced Changes on the Optical Properties of Single-Layer WS 2. Materials (Basel) 2023; 16:2591. [PMID: 37048884 PMCID: PMC10095963 DOI: 10.3390/ma16072591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/16/2023] [Accepted: 03/17/2023] [Indexed: 06/19/2023]
Abstract
Among the most studied semiconducting transition metal dichalcogenides (TMDCs), WS2 showed several advantages in comparison to their counterparts, such as a higher quantum yield, which is an important feature for quantum emission and lasing purposes. We studied transferred monolayers of WS2 on a drilled Si3N4 substrate in order to have insights about on how such heterostructure behaves from the Raman and photoluminescence (PL) measurements point of view. Our experimental findings showed that the Si3N4 substrate influences the optical properties of single-layer WS2. Beyond that, seeking to shed light on the causes of the PL quenching observed experimentally, we developed density functional theory (DFT) based calculations to study the thermodynamic stability of the heterojunction through quantum molecular dynamics (QMD) simulations as well as the electronic alignment of the energy levels in both materials. Our analysis showed that along with strain, a charge transfer mechanism plays an important role for the PL decrease.
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Affiliation(s)
- F. D. V. Araujo
- Instituto Federal de Educação, Ciência e Tecnologia do Piauí-Campus Campo Maior, Avenida Raimundo Doca da Silva, S/N-Fazendinha, Campo Maior 64280-000, Piauí, Brazil
- LIMAV—Laboratório Interdisciplinar de Materiais Avançados, Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGCM), Universidade Federal do Piauí, Teresina 64049-550, Piauí, Brazil
| | - F. W. N. Silva
- Instituto Federal de Educação, Ciência e Tecnologia do Maranhão-Campus Alcântara, Alcântara 65250-000, Maranhão, Brazil
- Programa de Pós-Graduação em Engenharia de Materiais (PPGEM), Instituto Federal de Educação, Ciência e Tecnologia do Maranhão-Campus Monte Castelo, Avenida Getúlio Vargas, Nº 04, São Luís 65030-005, Maranhão, Brazil
| | - T. Zhang
- Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA
| | - C. Zhou
- Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA
| | - Zhong Lin
- Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA
| | - Nestor Perea-Lopez
- Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA
| | - Samuel F. Rodrigues
- LIMAV—Laboratório Interdisciplinar de Materiais Avançados, Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGCM), Universidade Federal do Piauí, Teresina 64049-550, Piauí, Brazil
- Programa de Pós-Graduação em Engenharia de Materiais (PPGEM), Instituto Federal de Educação, Ciência e Tecnologia do Maranhão-Campus Monte Castelo, Avenida Getúlio Vargas, Nº 04, São Luís 65030-005, Maranhão, Brazil
| | - Mauricio Terrones
- Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA
| | | | - R. S. Alencar
- Faculdade de Física, Universidade Federal do Pará, Belém 66075-110, Pará, Brazil
| | - Bartolomeu C. Viana
- LIMAV—Laboratório Interdisciplinar de Materiais Avançados, Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGCM), Universidade Federal do Piauí, Teresina 64049-550, Piauí, Brazil
- Departamento de Física, Campus Ministro Petrônio Portella, Universidade Federal do Piauí, Teresina 64049-550, Piauí, Brazil
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Rodrigues L, Ekundi-Valentim E, Florenzano J, Cerqueira ARA, Soares AG, Schmidt TP, Santos KT, Teixeira SA, Ribela MTCP, Rodrigues SF, de Carvalho MH, De Nucci G, Wood M, Whiteman M, Muscará MN, Costa SKP. Protective effects of exogenous and endogenous hydrogen sulfide in mast cell-mediated pruritus and cutaneous acute inflammation in mice. Pharmacol Res 2016; 115:255-266. [PMID: 27840098 DOI: 10.1016/j.phrs.2016.11.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 10/20/2016] [Accepted: 11/09/2016] [Indexed: 12/24/2022]
Abstract
The recently described 'gasomediator' hydrogen sulfide (H2S) has been involved in pain mechanisms, but its effect on pruritus, a sensory modality that similarly to pain acts as a protective mechanism, is poorly known and controversial. The effects of the slow-releasing (GYY4137) and spontaneous H2S donors (Na2S and Lawesson's reagent, LR) were evaluated in histamine and compound 48/80 (C48/80)-dependent dorsal skin pruritus and inflammation in male BALB/c mice. Animals were intradermally (i.d.) injected with C48/80 (3μg/site) or histamine (1μmol/site) alone or co-injected with Na2S, LR or GYY4137 (within the 0.3-100nmol range). The involvement of endogenous H2S and KATP channel-dependent mechanism were also evaluated. Pruritus was assessed by the number of scratching bouts, whilst skin inflammation was evaluated by the extravascular accumulation of intravenously injected 125I-albumin (plasma extravasation) and myeloperoxidase (MPO) activity (neutrophil recruitment). Histamine or C48/80 significantly evoked itching behavior paralleled by plasma extravasation and increased MPO activity. Na2S and LR significantly ameliorated histamine or C48/80-induced pruritus and inflammation, although these effects were less pronounced or absent with GYY4137. Inhibition of endogenous H2S synthesis increased both Tyrode and C48/80-induced responses in the skin, whereas the blockade of KATP channels by glibenclamide did not. H2S-releasing donors significantly attenuate C48/80-induced mast cell degranulation either in vivo or in vitro. We provide first evidences that H2S donors confer protective effect against histamine-mediated acute pruritus and cutaneous inflammation. These effects can be mediated, at least in part, by stabilizing mast cells, known to contain multiple mediators and to be primary initiators of allergic processes, thus making of H2S donors a potential alternative/complementary therapy for treating inflammatory allergic skin diseases and related pruritus.
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Affiliation(s)
- L Rodrigues
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - E Ekundi-Valentim
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - J Florenzano
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - A R A Cerqueira
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - A G Soares
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - T P Schmidt
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - K T Santos
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - S A Teixeira
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - M T C P Ribela
- Department of Biotechnology, Institute of Nuclear and Energetic Research (IPEN), Sao Paulo, Brazil
| | - S F Rodrigues
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - M H de Carvalho
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - G De Nucci
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - M Wood
- University of Exeter Medical School, Exeter, UK
| | - M Whiteman
- University of Exeter Medical School, Exeter, UK
| | - M N Muscará
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - S K P Costa
- Department of Pharmacology, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil.
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Bernardes FR, Rodrigues SF, Silva ES, Reis GS, Silva MBR, Junior AMJ, Balancin O. Analytical modeling of the thermomechanical behavior of ASTM F-1586 high nitrogen austenitic stainless steel used as a biomaterial under multipass deformation. Mater Sci Eng C Mater Biol Appl 2015; 51:87-98. [PMID: 25842112 DOI: 10.1016/j.msec.2015.02.040] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 01/14/2015] [Accepted: 02/23/2015] [Indexed: 11/17/2022]
Abstract
Precipitation-recrystallization interactions in ASTM F-1586 austenitic stainless steel were studied by means of hot torsion tests with multipass deformation under continuous cooling, simulating an industrial laminating process. Samples were deformed at 0.2 and 0.3 at a strain rate of 1.0s(-1), in a temperature range of 900 to 1200°C and interpass times varying from 5 to 80s. The tests indicate that the stress level depends on deformation temperature and the slope of the equivalent mean stress (EMS) vs. 1/T presents two distinct behaviors, with a transition at around 1100°C, the non-recrystallization temperature (Tnr). Below the Tnr, strain-induced precipitation of Z-phase (NbCrN) occurs in short interpass times (tpass<30s), inhibiting recrystallization and promoting stepwise stress build-up with strong recovery, which is responsible for increasing the Tnr. At interpass times longer than 30s, the coalescence and dissolution of precipitates promote a decrease in the Tnr and favor the formation of recrystallized grains. Based on this evidence, the physical simulation of controlled processing allows for a domain refined grain with better mechanical properties.
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Affiliation(s)
- Fabiano R Bernardes
- Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil
| | - Samuel F Rodrigues
- Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil.
| | - Eden S Silva
- Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil
| | - Gedeon S Reis
- Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil
| | - Mariana B R Silva
- Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil
| | - Alberto M J Junior
- Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil
| | - Oscar Balancin
- Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil
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Delano FA, Chen AY, Wu KIS, Tran ED, Rodrigues SF, Schmid-Schönbein GW. THE AUTODIGESTION HYPOTHESIS AND RECEPTOR CLEAVAGE IN DIABETES AND HYPERTENSION. ACTA ACUST UNITED AC 2011; 8:37-46. [PMID: 22081770 DOI: 10.1016/j.ddmod.2011.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
One of the key features of cardiovascular complications, such as hypertension or diabetes, is that they often appear at the same time in the same individual together with other forms of co-morbidities. While clinically a recognized phenomenon, no molecular mechanism for such co-morbidities has received universal acceptance. We propose a new hypothesis that provides a molecular basis for co-morbidities in hypertension due to unchecked proteolytic activity and receptor destruction. Testing of the hypothesis in the spontaneously hypertensive rat reveals an unchecked matrix metalloproteinase and serine protease activity in plasma and on several cardiovascular and parenchymal cells. The elevated proteolytic activity causes extracellular cleavage of multiple receptor types, such that cleavage of one receptor type leads to loss of the function carried out by this receptor. Proteolytic cleavage of the extracellular domain of the β(2) adrenergic receptor in arteries and arterioles causes vasoconstriction and elevation of the central blood pressure while cleavage of the extracellular domain of the insulin receptor leads to insulin resistance and lack of transmembrane glucose transport. A diverse set of cell dysfunctions in the spontaneously hypertensive rat are accompanied by cleavage of the membrane receptors that are involved in these functions. Chronic inhibition of the unchecked protease activity in the spontaneously hypertensive rat serves to restore the extracellular receptor density and alleviates the corresponding cell dysfunctions. The mild unchecked proteolytic activity in the spontaneously hypertensive rat points towards a chronic autodigestion process as a contributor to the end organ injury encountered in this rat strain. The presence of various soluble receptors, which consist of extracellular fragments of membrane receptors, in the plasma of hypertensive and diabetic patients suggest that the autodigestion process may also be present in man.
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Affiliation(s)
- F A Delano
- Department of Bioengineering, Institute for Engineering in Medicine, University of California San Diego, La Jolla, CA 92093 - 0412
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