| Full text | |
| Author(s): |
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]
Total Authors: 9
|
| Affiliation: | [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
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | AIP ADVANCES; v. 9, n. 11 NOV 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties |
| Grantee: | Adalberto Fazzio |
| Support Opportunities: | Research Projects - Thematic Grants |