Abstract
A facile and green method was employed to prepare large-scale free-standingTiO2 nanotube (TNT) arrays, in which as-anodizedTiO2 nanotube films prepared in organic electrolytes with thickness ranging from seven to tens ofmicrometers were then ultrasonicated in a mix solution of ethanol and water. By controlling theratio of ethanol to water, the time and the power of ultrasonication, large-scale free-standingTiO2 nanotube arrays without any crack could be detached from the Ti substrates. Hydrogensensing results demonstrated that the free-standing TNT film is more sensitivethan a film with Ti substrates when exposed to 1000 ppm hydrogen ambient.
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