Thermodynamic properties of CdSe quantum dots

We have fabricated a series of CdSe quantum dots with different size 2.8, 4.1 and 5.6 nm by solution phase method. The size effects were investigated by the measurements of magnetic susceptibility and heat capacity. The Pauli magnetic susceptibility linearly increased with surface atom fraction reflecting the appearance of surface density of states of conduction electrons. The linear coefficient of specific heat $\gamma $ for 2.8 nm is $\sim $5.5 mJ/mol K$^{2}$ which is about five times that of the bulk. The enhancement Pauli magnetic susceptibility and linear coefficient of specific heat in quantum dots gives a strong evidence of the formation of electron delocalization and the surface disorder effects.