Figure 2

Highly purified AuNRs used to fabricate AuNR arrays. (A) SEM image of AuNRs uniformly distributed on a MPTMS-modified silicon surface. Insets are a digital picture of AuNR dispersion (approximately 0.1 mg/ml) showing the Tyndall effect, UV-Vis spectrum, and close-up view of AuNRs, respectively. (B) In situ AFM image of AuNRs captured in the same area as outlined area in the SEM image. The circled items in the two images are used as markers to demonstrate the same areas. (C) Statistical distribution of lengths of 722 AuNRs.