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Preparation of TiO2NTArrays.
Titanium foils (250 ¦Ìmthick,99.8%; Sigma Aldrich) were ultrasonically cleaned in acetone and ethanol prior to anodization. These foils were anodized at 30 V for 2 h in a two-electrode electrochemical cell in an ethylene glycol (EG) solution containing 0.3 wt % NH4F and 1% volume of H2O. The formed TiO2 NTs are 4 ¦Ìm long (7).In all cases, a platinum foil was used as the counter electrode.The distance between the two electrodes was maintained at 2 cm. The as-anodized TiO2 NTs were sintered in oxygen atmosphere at 550 ¡ãC for 5 h before Cu0 deposition.
Fabrication of Cu2O/TiO2 Networks.
Cu crystals were electrodeposited on TiO2 NTs in a solution containing 5mM CuSO4 in a typical three electrochemical cell equipped with a Pt wire counter electrode and saturated calomel electrode (SCE) reference. The electrodeposition was carried out with a rectangular potential pulsed mode at a potential of -2.0V for 0.2 s, and then a potential of -0.00001 V for 1 s, with 100 pulses. The Cu loaded TiO2 NTs were then potentiostatically anodized in 0.5 M NaOH electrolyte at 0.5 V for 30 min at 25 ¡ãC to fabricate Cu2O materials on TiO2 NTs.

³ö×ÔHigh Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu2O/TiO2 p-n Heterojunction Network Catalyst
LIXIA YANG SHENGLIAN LUO YUE LI YANXIAO QING KANG QINGYUN CAI
Environ. Sci. Technol. 2010, 44, 7641¨C7646

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