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(Color online) (a) STM images of the sample heat treated at different temperatures. All images are shown in the same scale . (b) X-ray diffraction profile of the (100) peak for samples heat treated at different temperatures.
(Color online) Raman spectra of the sample heat treated at , for five different laser energy values (1.92, 2.18, 2.41, 2.54, and ).
(Color online) (a) Plot of the ratio of the integrated intensities of the and bands vs for all spectra obtained with the five different excitation laser energies. (b) All experimental results shown in part (a) collapse in the same straight line in the vs plot.
values of the heat treated samples obtained by x-ray diffraction analysis and from the STM images.
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