Co-localised Raman and force spectroscopy reveal the roles of hydrogen bonds and π-π interactions in defining the mechanical properties of diphenylalanine nano- and micro-tubes

An integrated atomic force and polarized Raman microscope were used to measure the elastic properties of individual diphenylalanine (FF) nano- and micro-tubes and to obtain quantitative information regarding the inter-molecular interactions that define their mechanical properties. For individual tub...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (25)
Main Authors: Sinjab, Faris, Bondakov, Georgi, Notingher, Ioan
Format: Article
Language:English
Subjects:
Applied physics
Atomic force microscopy
BONDING
CHEMICAL BONDS
Elastic properties
ELASTICITY
HYDROGEN
Hydrogen bonding
Hydrogen bonds
INFORMATION
INTERACTIONS
MATERIALS SCIENCE
Mechanical properties
MICROSCOPES
MICROSTRUCTURE
Modulus of elasticity
Molecular interactions
NANOSCIENCE AND NANOTECHNOLOGY
NANOTUBES
NITROGEN 25
PRESSURE RANGE GIGA PA
RAMAN SPECTROSCOPY
RINGS
SHEAR
Shear modulus
Spectrum analysis
TUBES
X RADIATION
X ray spectra
YOUNG MODULUS
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Summary:An integrated atomic force and polarized Raman microscope were used to measure the elastic properties of individual diphenylalanine (FF) nano- and micro-tubes and to obtain quantitative information regarding the inter-molecular interactions that define their mechanical properties. For individual tubes, co-localised force spectroscopy and Raman spectroscopy measurements allowed the calculation of the Young's and shear moduli (25 ± 5 GPa and 0.28 ± 0.05 GPa, respectively) and the contribution of hydrogen bonding network to the Young's modulus (∼17.6 GPa). The π-π interactions between the phenyl rings, dominated by T-type arrangements, were estimated based on previously published X-ray data to only 0.20 GPa. These results provide experimental evidence obtained from individual FF tubes that the network of H-bonds dominates the elastic properties of the FF tubes.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4885090