Figure 1 .

TEM images of pristine. (A) ND, (B) NH2-ND, (C) HPmND-1.0 %, and (D) HPgND-1.0 %. The scale bar is 50 nm.

Song et al. Nanoscale Research Letters 2012 7:355   doi:10.1186/1556-276X-7-355
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