TEM images of AuNPs synthesized by CO reduction of HAuCl4. A, B, C, and D are TEM images of AuNPs synthesized without the addition of K2CO3. E and F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm respectively.
Young et al. Nanoscale Research Letters 2011 6:428 doi:10.1186/1556-276X-6-428