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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Enhanced piezoresponse and nonlinear optical properties of fluorinated self-assembled peptide nanotubes

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Autor(es):
Khanra, Soma [1] ; Vassiliades, Sandra V. [2] ; Alves, Wendel A. [2] ; Yang, Kaidi [3] ; Glaser, Rainer [3, 4] ; Ghosh, Kartik [5] ; Bhattacharya, Payal [1] ; Yu, Ping [1] ; Guha, Suchismita [1]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 - USA
[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09219580 Santo Andre, SP - Brazil
[3] Univ Missouri, Dept Chem, Columbia, MO 65211 - USA
[4] Missouri Univ Sci & Technol, Rolla, MO 65409 - USA
[5] Missouri State Univ, Phys Astron & Mat Sci, Springfield, MO 65897 - USA
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: AIP ADVANCES; v. 9, n. 11 NOV 2019.
Citações Web of Science: 0
Resumo

Self-assembled L,L-diphenylalanine (FF) nanostructures offer an attractive platform for photonics and nonlinear optics. The nonlinear optical (NLO) coefficients of FF nanotubes depend on the diameter of the tube {[}S. Khanra et al. Phys. Chem. Chem. Phys. 19(4), 3084-3093 (2017)]. To further enhance the NLO properties of FF, we search for structural modifications. Here, we report on the synthesis of fluorinated FF dipeptides by replacing one ortho-hydrogen atom in each of the phenyl groups of FF by a fluorine atom. Density-functional theoretical calculations yield insights into minimum energy conformers of fluorinated FF (Fl-FF). Fl-FF self-assembles akin to FF into micron-length tubes. The effects of fluorination are evaluated on the piezoelectric response and nonlinear optical properties. The piezoelectric d(15) coefficient of Fl-FF is found to be more than 10 times higher than that of FF nanotubes, and the intensity of second harmonic generation (SHG) polarimetry from individual Fl-FF nanotubes is more than 20 times that of individual FF nanotubes. Furthermore, we obtain SHG images to compare the intensities of FF and Fl-FF tubes. This work demonstrates the potential of fluorine substitution in other self-assembled biomimetic peptides for enhancing nonlinear optical response and piezoelectricity. (C) 2019 Author(s). (AU)

Processo FAPESP: 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte
Beneficiário:Adalberto Fazzio
Modalidade de apoio: Auxílio à Pesquisa - Temático