Abstract
In order to obtain a better photocatalytic performance under visible light, Ag2S-coupled TiO2 nanorod arrays (NRAs) were prepared through the electron beam deposition with glancing angle deposition (GLAD) technique, annealing in air, followed by the successive ionic layer absorption and reaction (SILAR) method. The properties of the photoelectrochemical and photocatalytic degradation of methyl orange (MO) were thus conducted. The presence of Ag2S on TiO2 NRAs was observed to have a significant improvement on the response to visible light. It’s resulted from that Ag2S coupling can improve the short circuit photocurrent density and enhance the photocatalytic activity remarkably.
Highlights
Comparing the spectra of the samples with different cycles, it can be seen that the absorption of Ag2S-coupled TiO2 NRAs displays an evident enhancement in the visible-light (~400–600 nm) region from 5 to 40 cycles
Without destructing the ordered TiO2 NRAs structure, Ag2S NPs were successfully deposited on the surface of TiO2 NRAs with different diameters from 20 to 40 cycles and the deposition amount can be readily controlled by SILAR cycles
The side view SEM image of 20-cycle sample is given in Fig. 1f, which shows the length of the fabricated Ag2S-coupled TiO2 NRAs are ~160 nm as well
Summary
Comparing the spectra of the samples with different cycles, it can be seen that the absorption of Ag2S-coupled TiO2 NRAs displays an evident enhancement in the visible-light (~400–600 nm) region from 5 to 40 cycles. While there were obvious photocurrent increases under visible-light illumination for all Ag2S-coupled TiO2 NRAs samples.
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