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Szostak R, Silva JC, Turren-Cruz SH, Soares MM, Freitas RO, Hagfeldt A, Tolentino HCN, Nogueira AF. Nanoscale mapping of chemical composition in organic-inorganic hybrid perovskite films. Sci Adv 2019; 5:eaaw6619. [PMID: 31692661 PMCID: PMC6814396 DOI: 10.1126/sciadv.aaw6619] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 09/13/2019] [Indexed: 05/09/2023]
Abstract
Lead-based organic-inorganic hybrid perovskite (OIHP) solar cells can attain efficiencies over 20%. However, the impact of ion mobility and/or organic depletion, structural changes, and segregation under operating conditions urge for decisive and more accurate investigations. Hence, the development of analytical tools for accessing the grain-to-grain OIHP chemistry is of great relevance. Here, we used synchrotron infrared nanospectroscopy (nano-FTIR) to map individual nanograins in OIHP films. Our results reveal a spatial heterogeneity of the vibrational activity associated to the nanoscale chemical diversity of isolated grains. It was possible to map the chemistry of individual grains in CsFAMA [Cs0.05FA0.79MA0.16Pb(I0.83Br0.17)3] and FAMA [FA0.83MA0.17Pb(I0.83Br0.17)3] films, with information on their local composition. Nanograins with stronger nano-FTIR activity in CsFAMA and FAMA films can be assigned to PbI2 and hexagonal polytype phases, respectively. The analysis herein can be extended to any OIHP films where organic cation depletion/accumulation can be used as a chemical label to study composition.
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Affiliation(s)
- R. Szostak
- University of Campinas (UNICAMP), Laboratório de Nanotecnologia e Energia Solar, Chemistry Institute, Campinas, PO Box 6154, 13083-970, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
| | - J. C. Silva
- University of Campinas (UNICAMP), Laboratório de Nanotecnologia e Energia Solar, Chemistry Institute, Campinas, PO Box 6154, 13083-970, Brazil
| | - S.-H. Turren-Cruz
- Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, Germany
- Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - M. M. Soares
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
| | - R. O. Freitas
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
| | - A. Hagfeldt
- Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - H. C. N. Tolentino
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
- Corresponding author. (A.F.N.); (H.C.N.T.)
| | - A. F. Nogueira
- University of Campinas (UNICAMP), Laboratório de Nanotecnologia e Energia Solar, Chemistry Institute, Campinas, PO Box 6154, 13083-970, Brazil
- Corresponding author. (A.F.N.); (H.C.N.T.)
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Magalhães LP, Guimarães I, Melo SL, Mateo E, Andalaft RB, Xavier L, Lorga AM, Fagundes AA, Moreira D, Hachul DT, Sternick EB, Andrea EM, Cannavan F, Oliveira F, Darrieux F, Lima GG, Atié J, Elias J, Zimerman LI, Miana L, Pellanda LC, Sacilotto L, Jatene MB, Soares MM, Binotto MA, Scanavacca MI, Oliveira NA, Zielinsky P, Salerno PR, Teixeira RA, Kuniyoshi RR, Costa R, Schames S, Pedra S, Gimenez SC, Wu TC, Aiello VD. [Not Available]. Arq Bras Cardiol 2016; 107:1-58. [PMID: 27487201 DOI: 10.5935/abc.20160103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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de M Guimarães LB, Soares MM. A future with less of a gap between rich and poor. Ergonomics 2008; 51:59-64. [PMID: 18097832 DOI: 10.1080/00140130701802650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- L B de M Guimarães
- Federal University of Rio Grande do Sul, Post-graduate Program in Production Engineering Programa de Pos Graduação em Engenharia de Produção, Porto Alegre, RS, Brazil.
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Soares MM, Mehta V, Finn OJ. Three different vaccines based on the 140-amino acid MUC1 peptide with seven tandemly repeated tumor-specific epitopes elicit distinct immune effector mechanisms in wild-type versus MUC1-transgenic mice with different potential for tumor rejection. J Immunol 2001; 166:6555-63. [PMID: 11359807 DOI: 10.4049/jimmunol.166.11.6555] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Low-frequency CTL and low-titer IgM responses against tumor-associated Ag MUC1 are present in cancer patients but do not prevent cancer growth. Boosting MUC1-specific immunity with vaccines, especially effector mechanisms responsible for tumor rejection, is an important goal. We studied immunogenicity, tumor rejection potential, and safety of three vaccines: 1) MUC1 peptide admixed with murine GM-CSF as an adjuvant; 2) MUC1 peptide admixed with adjuvant SB-AS2; and 3) MUC1 peptide-pulsed dendritic cells (DC). We examined the qualitative and quantitative differences in humoral and T cell-mediated MUC1-specific immunity elicited in human MUC1-transgenic (Tg) mice compared with wild-type (WT) mice. Adjuvant-based vaccines induced MUC1-specific Abs but failed to stimulate MUC1-specific T cells. MUC1 peptide with GM-CSF induced IgG1 and IgG2b in WT mice but only IgM in MUC1-Tg mice. MUC1 peptide with SB-AS2 induced high-titer IgG1, IgG2b, and IgG3 Abs in both WT and MUC1-Tg mice. Induction of IgG responses was T cell independent and did not have any effect on tumor growth. MUC1 peptide-loaded DC induced only T cell immunity. If injected together with soluble peptide, the DC vaccine also triggered Ab production. Importantly, the DC vaccine elicited tumor rejection responses in both WT and MUC1-Tg mice. These responses correlated with the induction of MUC1-specific CD4+ and CD8+ T cells in WT mice, but only CD8(+) T cells in MUC1-Tg mice. Even though MUC1-specific CD4+ T cell tolerance was not broken, the capacity of MUC1-Tg mice to reject tumor was not compromised.
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Affiliation(s)
- M M Soares
- Immunology Program and Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh PA 15261, USA
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Peres F, Soares MM. [Retention of upper incisors due to supernumerary teeth]. Rev Port Estomatol Cir Maxilofac 1983; 24:541-8. [PMID: 6672974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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