Figure 3. (A) Fluorescence images of LA-PEG750-OCH3- and (B) LA-ZW-capped AuNCs in buffers at pH ranging from 2 to 13,taken after three and six months of storage. (C) PL spectra of LA-PEG750-0CH3- and (D) LA-ZW-capped AuNCs freshly prepared,after 1 month and 3 months of storage. (E, F) PL spectra of AuNCs prepared using the above ligands in PBS buffer, PBS buffercontaining 0.25M GSH, and PBS buffer containing 2 M NaCl. Inset shows a photograph of the corresponding AuNCs underroom and UV light exposure; image was taken after 1 day of storage. (G, H) Images under room and UV light exposure: (1) pureDMEM growth media, (2) AuNCs in DI water, and (3) AuNCs in DMEM growth media; images were taken after 1 day of storage.The fluorescence spectra were generated using lex = 550 nm.