Methods of Measuring Properties of Nanostructures by magnetic resonance

Magnetic resonance is a branch of spectroscopy that has provided information on nanostructures, involving the study of microwave (radar frequency) and radio frequency transitions.

Several types of magnetic resonance are:

Nuclear magnetic resonance (NMR) involving the interaction of a nucleus possessing a nonzero nuclear spin I…

…the fact that C60 with 12 regular pentagons and 20 hexagons have all of its carbon atoms equivalent,  was determined unequivocally by the 13C NMR spectrum. In contrast to this, the rugby-ball C70 fullerence molecule, has five tzpes of carbon, and this is confirmed by the 13C NMR spectrum.

Electron Spin resonance detects unpaired electrons in transition ions, specially those with oddd numbrs of electrons suc as C2+ (3d9). Free Radicals like those associated with defects or radiation damage can also be detecte. The energies or resonant frequencies are three orders of magnitude higher than NMR for the same magnetic field.

Electron paramagnetic resonance utilized to study conduction electrons in metal nanoparticles, and to detect the presence of conduction electrons in nanotubes to determine whether the tubes are metals or very narrowband semiconductors. The technique was employed to identify trapped oxygen holes in colloidal TiO2 semiconductor nanoclusters. It has also been helpful in clarifying spin-flip resonance trasitions and Landau bands in quantum dots.


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