Method for preparing cuprous oxide composite titanium dioxide nanotube array

The invention discloses a method for preparing a cuprous oxide composite titanium dioxide nanotube array, which relates to a nanotube. The method comprises the following steps of: cleaning and pre-processing the surface of a substrate material; preparing 0.1 to 1.5 weight percent of aqueous solution of hydrogen fluoride into an electrolyte, performing electrochemical anode oxidization on the substrate material, namely forming a layer of ordered TiO2 nanotube array film with controllable size on the surface of the substrate material, and performing thermal treatment on the film; preparing ethanol solution with copper salt concentration of 0.014 to 4mol/L, adding 0.001 to 0.06mmol of polyvinylpyrrolidone into the ethanol solution, after the solution is uniformly dispersed, putting the obtained film into the solution, putting the film in a water bath, adding 0.01 to 0.80mol of glucose and 0.10 to 0.95mol of NaOH, and performing ultrasonic treatment and then taking the film out; and performing thermal treatment on the obtained composite film in vacuum at the temperature of between 50 and 200 DEG C for 1 to 5 hours to obtain the cuprous oxide composite TiO2 nanotube array.