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. Author manuscript; available in PMC: 2013 Jul 21.
Published in final edited form as: Nanoscale. 2012 Mar 29;4(14):4228–4233. doi: 10.1039/c2nr30212h

Figure 1.

Figure 1

pAuNPs created in glycine matrices through a solid-phase thermal reduction method. (a) pAuNPs of 20 nm were created after the reaction was completed. Inset: size distribution of pAuNPs by counting 150 particles. (b) HR-TEM image of pAuNPs, containing many grains with size down to 1 nm (scale bar: 2 nm), two ~5 nm and two ~1 nm representative individual grains are labelled with white circles; Inset: commercially available multi-twinned gold NP (mAuNP) composed of 8 nm grains (scale bar: 5 nm). (c) X-ray photoelectron spectroscopic measurements on Au 4f7/2 binding energy (BE) of pAuNPs and mAuNPs. Two peaks with maxima at 84.0 eV and 85.1 eV were observed from ~20 nm pAuNPs while only one peak at 83.9 eV was observed from the same size mAuNPs.