I need the definite reason how the particle size decreases with increasing dopant concentration especially in metal nanoparticles.
Is it so that necessarily every time the particle size decreases? The dopant disturbs, replaces or occupies places in the lattice packing and size does is changed!
It may be due to closely packing of dopant with the NP lattice.
It is also quite common for dopants to act as nucleation sites in nanoparticle syntheses reducing the energy required for particles to start forming, for more information look into heterogeneous nucleation. The increased number of nucleation sites/events can result in a greater number of smaller particles.
Rm Mathammal Please provide more detail. How are you measuring size? What do you mean by dopant? What are your particles dispersed in?
When talking about dopants they can not be responsible for nucleation sites, as their concentration is low and they don't act as particle themselves (in the case they form their own particle the final system will be a composite, as one can identify the heterogeneous particle responsible for the begining of nucleating).
And as Riaz told already, the dopant will disturb the lattice, affecting the growth, but I'm not sure in all the cases the particles will be smaller.
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