绒球状结构氧化钨的制备

Synthesis of tungsten oxide with pompon-like structure

通过W粉和Ni(NO3)2·6H2O在钼包套内反应,制备出微米尺度的绒球状结构氧化钨。绒球状结构由长度达数百微米、外径1～10μm的微米管和直径100500nm的亚微米纤维组成。X射线衍射和透射电子显微镜分析表明:产物为具有良好晶体结构的沿[010]方向生长的单斜结构的W18O49。这些通过Vapor Solid(V S)生长机制形成的绒球状结构氧化钨因为具有巨大的表面积,在微型半导体敏感元件方面具有巨大的应用前景。

Micrometer scale tungsten oxide with pompon-like structure was prepared by the reaction of the mixture powder of W and Ni(NO_3)_2 ·6H_2O in a molybdenum envelopment. The pompon-like structure consists of microtubes with outer diameter of 110 μm and fibrils with diameter of 100500 nm which are hundreds of micrometers in length. XRD and TEM analyses show that the as-synthesized product were well-crystallized monoclinic structure W_18O_49 with the axes preferentially aligned along the [010] direction. The pompon-like structure was formed by the Vapor-Solid (V-S) mechanism. With the huge surface of the unique pompon-like structure, the potential application of micrometer scale tungsten oxide in micro-sized semiconductor sensors would be promising.