Figure 1
From: Aggregation affects optical properties and photothermal heating of gold nanospheres

Averaged extinction cross-section of aggregated 5, 16, and 30 nm GNP by spectra plots (a) and contour plots produced with fitting and smoothing algorithms (b). (a) Number on the left of the y-axis indicate the number of GNPs in the aggregate. A second peak can be observed for 2 particle aggregations at various wavelength and gradually diminished with increase of aggregation sizes up to 30 (5 and 16 nm GNP) and up to 20 (30 nm GNP).