Find in Library

The porous Co₃O₄ hollow nanospheres were synthesized <i>via</i> hard template method by a carbon spheres templated strategy. The morphology and structure of materials were studied by SEM, XRD, FTIR, BET and XPS. The structure and gas sensing properties of Co₃O₄ hollow nanospheres were controlled by changing the concentration of precursor and aging time. The results show that the Co₃O₄ hollow nanospheres with diameter of 500nm composed by 40nm Co₃O₄ nanoparticles can be synthesized with 0.1mol/L precursor and aging for 48h. The surface of nanospheres is porous structure. The synthesized Co₃O₄ hollow nanospheres sensor have good gas response to 100&#215;10^-6-0.5&#215;10^-6 NH₃ at room temperature. The gas sensitivity to 100&#215;10^-6 NH₃ reaches 155.8% and the response time is 1.3s. The limit level of this gas sensor to NH₃ is 0.5&#215;10^-6.