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Copper oxide nanostructures are fascinating nanomaterials due to their remarkable electrical, optical, thermal, and sensing properties given that their tunability and the stabilization of specific phases are uniquely possible at the nanoscale dimensions.

The present study reports on nano-crystalline copper oxide thin films via a simple synthesis from chemical solutions (SCS) followed by two types of thermal annealing, namely rapid thermal annealing (RTA) and conventional thermal annealing (TA). We report on the enhanced ethanol sensing performances of the device structures based on synthesized copper oxide nanocrystals with one and two distinctly different phases, namely Cu₂O, CuO, as well as mixed phases CuO/Cu₂O.

A gradient in phase change of nano-crystals was observed for annealed samples starting from CuO on the top to Cu₂O in their central region. RTA effects on the gas response of the Cu_xO_y …