Stability improving effect of silver diamminohydroxide precursor in green hydrothermal synthesis of silver nanoparticle colloids

The results of this reported work indicate that the precursor plays a significant role as well as surfactant in the hydrothermal synthesis of high-quality silver nanoparticles (AgNPs). To address the existent stability difficulties in the long-term storage and application conditions of AgNP hydrocolloids, silver diamminohydroxide ([Ag(NH₃)₂]OH) is attempted as the silver precursor instead of conventional silver nitrate (AgNO₃), which has been widely utilised. A simple green synthesis approach of size controllable quasi-spherical AgNP hydrocolloid using glucose reducer and dextran surfactant is experimentally adopted as a demonstration. Experimental results show that under the same synthesis conditions, [Ag(NH₃)₂]OH precursor-based AgNP hydrocolloid products perform with much higher stability than AgNO₃ based products. Also, the monodispersity of products is considerably improved.