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Your search keyword '"Paniago, R."' showing total 14 results
Start Over Author "Paniago, R." Journal applied physics letters
14 results on '"Paniago, R."'

13. Probing the elastic properties of individual nanostructures by combining in situ atomic force microscopy and micro-x-ray diffraction.

Author

Scheler, T., Rodrigues, M., Cornelius, T. W., Mocuta, C., Malachias, A., Magalhães-Paniago, R., Comin, F., Chevrier, J., and Metzger, T. H.

Subjects
NANOSTRUCTURES, ATOMIC force microscopy, X-ray diffraction, INDENTATION (Materials science), PRESSURE
Abstract

Atomic force microscopy (AFM) and micro-x-ray diffraction are combined to investigate nanostructures during in situ indentation. This technique allows the determination of elastic properties of individual nanoscale objects, particularly here SiGe/Si(001) self-assembled islands. Using this novel technique it was possible to select a specific island, align it in the microfocused beam, and apply a pressure onto it, using the AFM tip. Simultaneously, the x-ray diffuse scattering map from the island and the surrounding substrate was recorded in order to probe the lattice parameter change during indentation. An elastic reduction of the island lattice parameter of up to 0.6% was achieved. [ABSTRACT FROM AUTHOR]

Published
2009
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14. General equation for the determination of the crystallite size La of nanographite by Raman spectroscopy.

Author

Cançado, L. G., Takai, K., Enoki, T., Endo, M., Kim, Y. A., Mizusaki, H., Jorio, A., Coelho, L. N., Magalhães-Paniago, R., and Pimenta, M. A.

Subjects
GRAPHITE, EQUATIONS, NANOSTRUCTURES, RAMAN spectroscopy, PHYSICS
Abstract

This work presents a systematic study of the ratio between the integrated intensities of the disorder-induced D and G Raman bands (ID/IG) in nanographite samples with different crystallite sizes (La) and using different excitation laser energies. The crystallite size La of the nanographite samples was obtained both by x-ray diffraction using synchrotron radiation and directly from scanning tunneling microscopy images. A general equation for the determination of La using any laser energy in the visible range is obtained. Moreover, it is shown that ID/IG is inversely proportional to the fourth power of the laser energy used in the experiment. [ABSTRACT FROM AUTHOR]

Published
2006
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