Fig. 2: Normalized PL of solid Au20-AC and Au20(TBBT)16 and square wave voltammetry (SWV) of Au20-AC and Au20(TBBT)16.

a Normalized PL of solid Au20-AC and Au20(TBBT)16. Inset: The crystal of Au20-AC under visible light (top) and ultraviolet light (bottom), respectively. b SWV of 0.015 mM Au20-AC and Au20(TBBT)16 in 1:1 TOL: ACN with 0.1 M TBAP. Pt disk was used as working electrode, Pt foil and SCE were used as counter and reference electrode, respectively.