ZnSe nanoparticles (NPs) were prepared by combining both hydrothermal and mechanical milling methods. Fabricated ZnSe NPs with a sphere-like shape have an average size (d) in the range of 20–100 nm, affected by changing the milling time. All the samples crystalize in zincblende-type structure without impurities. The photoluminescence study has found a blue emission at 462 nm attributed to the excitonic nearband edge and a broad defect-related emission around 520–555 nm. Increasing milling time leads to the decrease in the exciton-emission intensity, while the defect-related emissions increase gradually. Interestingly, as decreasing d, we have observed an improved photodegradation of Rhodamine B under UV irradiation, proving application potentials of ZnSe NPs in photocatalytic activity.
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(a) ZnSe nanoparticles (NPs) were prepared by hydrothermal methods
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(b) ZnSe nanoparticles (NPs) were prepared by combining both hydrothermal and mechanical milling methods
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Figure 1. Fig. 1a EHE(T) data of ZnSe NPs fitted by Varshi function in the range T = 15-300 K. The inset shows ELE(T) data at T = 15-150 K; Fig 1b: (a) PL spectra of ZnSe NPs with different tm values excited by a wavelength λexc = 355 nm; the inset shows the PL spectra of the samples tm = 20–60 min in order to resolve their low PL signals. (b) The integrated PL intensity ratio of IE2/IE1 varying as a function of tm.
Figure 2. HR-TEM image of Au/TiO2 nanoparticle system (a) and Linear sweep voltammograms of Au/TiO2 films being fabricated under the different technological conditions.
The Au nanoparticles being fabricated with controllable size (4–8 nm) were evenly distributed on the surface of TiO2 nanoparticles (Fig. 2a). The photoelectrochemical properties of Au/TiO2 films are different when they are annealed in the air (Amb) and vacuum (Vac) environments for periods from 10 min to 90 min (Fig. 2b). Namely, the samples under annealing in the atmosphere for a long enough time (Au/TiO2-Amb-30min) showed the best photon-conversion efficiency.
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