查看文章

The doping effects of Ni-doped ZnCdS/ZnS (Ni:ZnCdS/ZnS) core/shell quantum dots (QDs) on the electrochemical and electro-optical properties of a nematic liquid crystal (LC) system were demonstrated. The impedance response of pure and QD-dispersed nematic LCs was investigated in the frequency range of 0.1 Hz–100 kHz. By fitting a suitable equivalent electric circuit model to the experimental data, it was concluded that the QDs doping noticeably increases the electrical conductivity and charge-capacitance of nematic LC. The ionic mobility and diffusion coefficient are strictly dependent on the QD concentration and the amount of these parameters decreases when 0.25 wt% of the QDs is introduced to the nematic LC, and then increases on further addition of the QDs. This phenomenon is due to the competition between the generated ionic impurities during assembling and the ion-capturing effect of the QDs …