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Table 1 Influence of pH upon stability of AuNPs

From: Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction

pH Before synthesis pH After synthesis Color Stability After 1 h stored at 22°C Stability After 6 h stored at 22°C Stability After 2 months Stored at 4°C
4.25 3.72 Light pink Stable Stable Small aggregation
4.25 3.72 Light pink Stable Stable Small aggregation
5.55 4.75 Light red Stable Stable Small aggregation
6.6 5.92 Light red Stable Stable Stable
7.45 6.11 Light red Stable Stable Stable
8.8 6.42 Light red Stable Stable Stable
9.23 6.55 Medium red Stable Stable Stable
9.34 6.32 Purple Stable Stable Medium aggregation
10.3 8.10 Blue Stable Some aggregation Heavy aggregation
11.4 10.96 Light blue Crashed Crashed Crashed