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. 2020 Nov 25;10(1):2001378. doi: 10.1002/adhm.202001378

Figure 2.

Figure 2

Optical properties of gold nanoparticles (AuNPs). A) Size‐dependent optical properties of AuNPs. As the mean diameter of AuNPs decreases from 150 to 20 nm, the peak absorbance shifts to a lower wavelength, resulting in a brighter color of the AuNPs solution. B) Absorption profiles of two AuNPs (40 nm size) of different shape corresponding to transverse (≈520 nm) and longitudinal (near the infrared region of spectrum) surface plasmon resonances, showing the shape dependent optical properties of AuNPs. C) Different shapes of AuNPs. D) Aggregation‐dependent optical properties of AuNPs. Aggregation of AuNPs causes peak absorbance shift to a higher wavelength.