Why am I getting aggregation in gold nano particle synthesis ?

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Mohammad Kooti

Controlling the pH of the solution is very important in the synthesis of Au NPs. pH=5 was recommended. Please check the following reference.

Nanoscale Research Letters, 2016,11,362.

Good luck!

Ramin Javahershenas

I recommend Please check the following articles:

DOI: 10.14202/vetworld.2014.72-77
DOI: 10.3390/s18072246
DOI: 10.4028/www.scientific.net/AMR.709.19

Omer Sadak

Hi Maheshwaran,

I recommend clean all the glassware with freshly prepared HCl: HNO3 solution (molar ratio of 3:1) and water. It will help you to avoid undesired nucleation during the synthesis. Due to contamination, the gold colloids may also aggregate.

Oussama Kheireddine Nehar

its likely due to contamination

which gold salt have you used ?

and which acid you used to lower the pH ?