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A facile hydrothermal synthesis with CuSO 4 as the copper source was used to prepare micro/nano-Cu 2 O. The obtained samples have been characterized by X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). With increasing the reaction temperature and time, the final products were successively Cu 2 O octahedron microcrystals, Cu 2 O/Cu composite particles, and a wide range of Cu spherical particles. The gas sensitivity of products towards ethanol and acetone gases was studied. The results showed that sensors prepared with Cu 2 O/Cu composites synthesized at 65°C for 15 min exhibited optimal gas sensitivity. The gas sensing mechanism and the effect of Cu in the enhanced gas response were also elaborated. The excellent gas sensitivity indicates that Cu 2 O/Cu composites have potential application as gas sensors.
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Wu et al. (2016) studied this question.
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