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We study the effect of citrate to gold molar ratio (X) on the size ofcitrated gold nanoparticles (AuNPs). This dependence is still a matter ofdebate for X $\ge$ 3 where the polydispersity is yet minimized. Indeed, thereis no consensus between experiments proposed so far for comparable experimentalconditions. Nonetheless, the sole available theoretical prediction has neverbeen validated experimentally in this range of X. We show unambiguously using 3techniques (UV-Vis spectroscopy, dynamic light scattering and transmissionelectronic microscopy), 2 different synthetic approaches (Direct, Inverse) and10 X values for each approach that AuNPs' size decay as a monoexponential withX. This result is, for the first time, in agreement with the sole availabletheoretical prediction by Kumar et al. on the whole studied range of X.

New Insight Into the Size Tuning of Monodispersed Colloidal Gold Obtained by Citrate Method