Figure 5.

The stress states of the top surface were determined by: (a) the Raman frequency of the E2 (high), (b) the diffraction peaks of (0002) and (0004) determined by XRD in the θ-2θ mode.

Liu et al. Nanoscale Research Letters 2011 6:69   doi:10.1186/1556-276X-6-69
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