Hello alI..!
I have synthesized gold nanoparticles using leaf extract and observed the formation of different shaped gold nanoparticles. I want to know the exact reason for the formation of such shaped nanoparticles?
Which caused the nanoparticles to become triangular, hexagonal, rod etc?
Kindly, add your valuable answer.
Thanks
Hi Vijay
Great question. The shape evolution of Au nanocrystals from Au seeds is controlled by the relative growth rates of different Au facets as the nanocrystal gets larger. The growth of particular Au faces can be suppressed by adsorption of ions (e.g. halides such as F-, Cl-, Br- or I-) or organic macromolecules and surfactants such as CTAB, oleic acid, thiols or citrate. In your case, you are using a leaf extract in the synthesis of your Au nanparticles. The leaf extract will contain a wide range of macromolecules with different reducing powers and adsorption characteristics, as well as simple ions, thereby leading to a broad distribution of Au nanoparticle shapes and sizes.
Attached are a couple of really nice papers to help you further
A Bioinspired Approach for Shaping Au Nanostructures: The Role of Biomolecule Structures in Shape Evolution Chem. Eur. J. 2013, 19, 8220 – 8226
Defining Rules for the Shape Evolution of Gold Nanoparticles J. Am. Chem. Soc. 2012, 134, 14542−14554
Best of luck for your future research
Geoff
Hi Vijay
Great question. The shape evolution of Au nanocrystals from Au seeds is controlled by the relative growth rates of different Au facets as the nanocrystal gets larger. The growth of particular Au faces can be suppressed by adsorption of ions (e.g. halides such as F-, Cl-, Br- or I-) or organic macromolecules and surfactants such as CTAB, oleic acid, thiols or citrate. In your case, you are using a leaf extract in the synthesis of your Au nanparticles. The leaf extract will contain a wide range of macromolecules with different reducing powers and adsorption characteristics, as well as simple ions, thereby leading to a broad distribution of Au nanoparticle shapes and sizes.
Attached are a couple of really nice papers to help you further
A Bioinspired Approach for Shaping Au Nanostructures: The Role of Biomolecule Structures in Shape Evolution Chem. Eur. J. 2013, 19, 8220 – 8226
Defining Rules for the Shape Evolution of Gold Nanoparticles J. Am. Chem. Soc. 2012, 134, 14542−14554
Best of luck for your future research
Geoff
Thank you so much Geoffrey sir for your reply with excellent answer for me.
You have provided me very valuable information and literatures
Thanks a lot...!
Also have a look
http://www.ece.rochester.edu/courses/ECE580/docs/metal_nano_Gao.pdf
The shape and size of gold nanoparticles could be controlled by varying the concentration and temperature of the precursor and the reducing agent.
Dear Anish Rajan....Thank you for you interest.
I have asked the reason behind the formation of different shaped nanoparticles.
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