Sputtering-Assisted Synthesis of Copper Oxide-Titanium Oxide Nanorods and Their Photoactive Performances

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Titanium dioxide (TiO2) is a widely studied photocatalyst.
• Improving TiO2's light absorption and charge separation is crucial for enhanced photoactivity.
• Copper oxides (Cu2O, CuO) are known for their light-absorbing properties.

Purpose of the Study:

• To create a composite material by decorating TiO2 nanorods with copper oxide.
• To investigate the effect of different crystallographic phases of copper oxide on photocatalytic performance.
• To optimize the composite material for enhanced degradation of organic dyes.

Main Methods:

• Fabrication of TiO2 nanorod templates.
• Decoration of TiO2 nanorods with copper oxide using sputtering.
• Post-sputtering annealing at various temperatures (200-400 °C) to control copper oxide phases.
• Characterization of crystallographic phases (Cu2O, CuO).
• Evaluation of photocatalytic activity in the degradation of Rhodamine B (RhB) dye.

Main Results:

• Successfully synthesized TiO2-copper oxide composite nanorods (TC).
• Controlled the crystallographic phase of the copper oxide layer by varying annealing temperature.
• Observed improved light absorption and photoinduced charge separation in TC compared to pristine TiO2.
• TC350, with a ternary phase composition, exhibited superior photocatalytic activity.
• Identified a Z-scheme carrier movement mechanism and larger granular size in TC350 contributing to its enhanced performance.

Conclusions:

• TiO2 nanorods decorated with copper oxide show enhanced photocatalytic properties.
• The crystallographic phase and microstructure of the copper oxide layer significantly influence photoactivity.
• The TC350 composite demonstrates potential for efficient degradation of organic pollutants like RhB dye.