Figure 4.

Surface and cross-sectional SEM images. The surface and cross-sectional SEM images of the Al2O3-polyimide composite thick films with different mixing ratios for the polyimide in the starting powder: (a) and (b) show the 4 vol.% composite, (c) and (d) show the 8 vol.% composite, and (e) and (f) show the 12 vol.% composite.

Kim and Nam Nanoscale Research Letters 2012 7:92   doi:10.1186/1556-276X-7-92
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