Fig. 1.

(a) Photograph of different samples at the dilution used in these experiments. (b) Absorbance of the samples. (1) NEB-GNS (thick blue line), (2) NEB-GNS filtered (black dotted line), (3) GNS (12 nm diameter, thin pink line), (4) dye IR-783 (red dash dotted line). All samples were diluted so their extinctions at 750 nm are 0.05 cm⁻¹, except for the GNS solution, which has an extinction of 0.009 cm⁻¹ with same amount of GNS as in the NEB-GNS. The vertical blue dotted line indicates the operating wavelength of this study (750 nm).