热氧化法在泡沫铜上制备CuO纳米线及其光催化性能研究

Fabrication of CuO Nanowires on Copper Foams by Thermal Oxidation and Investigation of Their Photocatalytic Properties

采用热氧化方法,在泡沫铜上制备了高度有序的三维Cu O纳米线（Cu O NWs）阵列;利用扫描电镜（SEM）,X射线衍射仪（XRD）和X射线光电子能谱（XPS）对Cu O NWs阵列的形貌、成分以及结构等进行了表征。重点研究了不同氧化温度对Cu O NWs形貌和氧化物平均晶粒尺寸的影响,讨论了纳米线的生长机制。结果表明：Cu O NWs直径随温度升高而增大,密度随Cu2O平均晶粒尺寸增大而减小,Cu O NWs的最佳生长温度为400℃,直径在50~120 nm,长度可达5μm,长径比最大,不易脱落。同时也研究了Cu O NWs阵列光催化降解甲基橙的能力。结果表明：Cu O NWs在可见光和紫外光照射下对甲基橙进行光催化降解时,其降解效率分别高达76.6%和87.2%。

A three-dimensional CuO nanowires （ CuO NWs） network was synthesized by thermal oxidation of copper foams. Morphology, composition and structure of the CuO NWs were characterized by scanning electron microscopy （ SEM）, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS） , respectively. The effects of different temperatures on the morphologies of CuO NWs, and on average crystalline sizes of oxides were investigated. Growth mechanism of the CuO NWs was also introduced. Based on the experimental data, it was clearly that the diameter of CuO NWs increased with the temperature. The density of CuO Nws decreased with the increasing average crystalline sizes of oxides. It was obvious that the optimal growth temperature was under 400 ℃ with an average diameter in the range of 50 - 120 nm, in addition to a length up to 5 txm, which performed the maximum aspect ratio. Meanwhile, the photocatalytic capability of CuO NWs towards methyl orange under visible and ultraviolet light was also tested in this paper. The results showed that CuO NWs possessed excellent photocatalytic ability with the degradation efficiency η of 76.6% and 87.2% under visible and ultraviolet light, respectively.