A tetragonal Cu 2 Se film containing a well-aligned nanosheet array with scattered 3D flower-like microstructures on top was synthesized for the first time by a rapid one-step low-energy route, which is beneficial for large scale industrial production due to savings in energy, time and expensive instruments. Phase transformation occurred after scraping the film from the Cu substrate, and heating or grinding the Cu 2 Se powder in air. The Cu 2 Se/Cu 3 Se 2 composite containing p-Cu 2 Se/p-Cu 3 Se 2 heterojunctions was obtained by simply calcining the Cu 2 Se in air at 300 °C for 3 h. The composite has enhanced gas sensing properties towards acetone gas and a lower band gap energy compared to Cu 2 Se.
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