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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 2.

Figure 2

Optical properties of pAuNPs. (a) UV-Vis absorption spectra of as synthesized 20 nm pAuNPs, 20 and 5 nm mAuNPs aqueous solutions. The surface plasmon maximum of pAuNPs is located at 536 nm, which is red shifted about 16 nm compared to those of 5 and 20 nm mAuNPs. (b) Fluorescence image of individual pAuNPs. Inset: emission spectrum of pAuNPs under 532 nm laser excitation. (c) Raman spectra of pAuNPs and mAuNPs coated by p-mercaptobenzoic acid (MBA) molecules. (d) Raman image of individual MBA-pAuNPs were constructed based on the vibration at 1579±10 cm−1.