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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: J Mater Chem B. 2018 May 1;6(20):3235–3239. doi: 10.1039/C8TB00368H

Figure 1.

Figure 1

Aggregation behavior of smart ligand-bound gold nanoparticles (SAuNPs) at pH 5.5. To monitor spectral and color changes of SAuNP colloids, a UV-vis spectrometer was used (A). The λmax of SAuNP colloids shifted from 524 to 650 nm, and the colloid color changed from red to blue owing to aggregation of SAuNPs. Dynamic light scattering (DLS)(B) and transmission electron microscopy (TEM) (C) showed the size of SAuNPs gradually increased to about 390 nm. Aggregation of the SAuNPs was confirmed at pH 5.5.