Abstract
• Double shell Cu 2 O hollow microspheres sensor was fabricated for the n-propanol detection. • The formation mechanism of double shell Cu 2 O hollow microsphere was studied. • The sensor based on double shell Cu 2 O hollow microspheres displayed high sensing performance to n-propanol at 187 ℃. • The sensor response and recovery time is 40 and 50 s, respectively. In this work, a feasible solvothermal strategy to the preparation of double-shelled Cu 2 O hollow microspheres is described. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of the as-synthesized precipitate revealed that they were hierarchical structures composed by nanoparticles. Moreover, the formation mechanism of double shell Cu 2 O hollow microsphere was studied. Gas sensing devices were fabricated using the Cu 2 O suspension by coating, and their sensing properties were investigated for response to various gases. The double shell Cu 2 O hollow microspheres sensors showed good selectivity to n-propanol (C 3 H 8 O) at 187 °C, a better linear range from 10 to 100 ppm, good repeatability and long-term stability. The excellent sensing performance of sensors to n-propanol could be ascribed to the hierarchical structures with a large specific surface area.
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