CuO/Cu2(OH)2CO3梭型中空颗粒的制备及其气敏性能(英文)

Hollow Spindle-Shaped CuO/Cu_2(OH)_2CO_3 Nanocomposites: Synthesis and Gas Sensing Property

以Cu2（OH）3NO3为前驱体,采用无模板溶剂热法成功合成了大小为1-2μm的Cu O/Cu2（OH）2CO3中空梭型微粒。高倍电镜显示其外壳层由高度弥散的Cu O和Cu2（OH）2CO3纳米颗粒组成。通过控制反应时间证明了该中空梭型粒子的形成过程是由自组装和奥斯特瓦尔德熟化过程控制。该纳米材料的特殊结构使其对乙醇、丙酮等有机气体有良好的气敏性能。

Hollow spindle-shaped Cu O/Cu2（OH）2CO3composites were fabricated via a templateless hydrothermal route with Cu2（OH）3NO3as the precursor. XRD measurements and TEM observations reveal that the as-prepared Cu O/Cu2（OH）2CO3is hollow spindle-shaped with size of 1-2 μm. HRTEM image indicates that the shell of each particle is highly dispersive mixtures of nanoscale Cu O and Cu2（OH）2CO3. Time dependent experiments disclose that the formation of hollow spindle-shaped Cu O/Cu2（OH）2CO3composites particles is driven by self-transformation and Ostwald ripening. The gas sensing performances were investigated with ethanol and acetone as the target gases. The as-prepared hollow Cu O/Cu2（OH）2CO3composites exhibit improved gas sensing properties in comparison with the commercial Cu O powders, which can be ascribed to the decreased grain-to-grain contacts of the highly dispersive mixtures.