Improved Sensitization of Zinc Oxide Nanorods by Cadmium Telluride Quantum Dots through Charge Induced Hydrophilic Surface Generation

Figure 4

(a) Water contact angle measurements made on 350°C air-annealed ZnO NRs before and after UV-c exposure for varying times showing surface saturation after ~180 minutes. The insets show images of the water droplet (5 μL) on the ZnO NR surface for different UV exposure times and (b) infrared absorption spectra of air-annealed ZnO NRs before and after UV annealing in ambient air. The spectra show the increase in surface OH concentration, organic impurity degradation, and attachment of CO₂ on the NR surfaces after UV annealing in air.

(a)  

(b)