Journal article
Correlating elastic properties and molecular organization of an ionic organic nanostructure
Nanoscale, Vol.6(1), pp.316-327
01/07/2014
Handle:
https://hdl.handle.net/2376/104049
PMID: 24193203
Abstract
Mechanical and structural properties of ionically self-assembled nanostructures of meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) and meso-tetra(4-pyridyl)porphyrin (TPyP) are presented. This is the first time that elastic modulus of an ionic porphyrin nanostructure has been reported. X-ray photoelectron spectroscopy (XPS), UV-visible spectra, and elemental analysis all support a stoichiometric 1 : 1 TSPP to TPyP composition. Atomic force microscopy (AFM) revealed that the porphyrin nanostructure is composed of stacked ribbons about 20 nm tall, 70 nm wide, and several microns in length. High resolution transmission electron microscopy (HRTEM) images showed clear lattice fringes 1.5 ± 0.2 nm in width aligned along the length of the nanorod. Selected area electron diffraction (SAED) and powder X-ray diffraction patterns of TSPP:TPyP are consistent with an orthorhombic system and space group Imm2 with lattice parameters a = 26.71 Å, b = 20.16 Å, and c = 8.61 Å. Crystallographic data is consistent with an arrangement of alternating face-to-face TSPP and TPyP molecules forming ordered columns along the length of the nanorods. The structural integrity of the solid is attributed to combined noncovalent interactions that include ionic, hydrogen bonding, and π-π interactions. The values of Young's modulus obtained for the crystalline TSPP:TPyP nanorods averaged 6.5 ± 1.3 GPa. This modulus is comparable to those reported for covalently bonded flexible polymeric systems. The robust bonding character of the TSPP:TPyP nanostructures combined with their mechanical properties makes them excellent candidates for flexible optoelectronic devices.
Metrics
6 Record Views
Details
- Title
- Correlating elastic properties and molecular organization of an ionic organic nanostructure
- Creators
- Jeremy R Eskelsen - Department of Chemistry and Materials Science and Engineering Program, Washington State University, Pullman, WA 99164-4630, USA. umazur@wsu.edu hipps@wsu.eduYun QiSamantha Schneider-PollackSamantha SchmittK W HippsUrsula Mazur
- Publication Details
- Nanoscale, Vol.6(1), pp.316-327
- Academic Unit
- Chemistry, Department of
- Publisher
- England
- Identifiers
- 99900546807001842
- Language
- English
- Resource Type
- Journal article