热分解法制备WS_2纳米纤维

Preparation of Tungsten Disulfide Nanofibers by Thermal Decomposition

以硫钨酸铵为原料,用热分解法制备出了WS2纳米纤维,采用TEM,HRTEM,XRD等分析手段对产物的形貌、结构、组成进行了检测,表明制备出的灰黑色WS2纳米纤维平均直径为几十纳米,最小只有几纳米,长度为几十微米;产物属六方晶系,a=0.3151nm,c=1.271nm,基本无杂质,较纯净.ED分析表明纤维为单晶,晶化程度好,(100)和(002)等衍射斑点清晰,与XRD分析结果一致.对WS2纳米纤维生长的影响因素如温度、升温速率、冷却速率和反应气氛、反应物的粒度等进行了讨论.

The method of preparing tungsten disulfide nanofibers by the thermal decomposition of ammonium tetrathiotungstate is reported, and TEM, HRTEM and XRD were employed to investigate the shape, structure and component of the product whose average diameter was less than 100 nm and the length longer than 10 mm. It is revealed that the product was dark-gray crystals with hexagonal lattice tungsten disulfide, a=0.3151 nm, c=1.271 nm, and quite pure. ED patterns show that the nanofibers were mono-crystal, highly crystallized, and the electron diffraction spots such as (100) and (002) were very clear. The factors such as the rate of raising temperature, cooling rate, atmosphere and reactant size were found to be dominating to the nanofibers growth.