水相沉法制备纳米片状钼铜矿(Cu3(MoO4)2(OH)2)

摘要

Lindgrenite (Cu3(MoO4)2(OH)2) nanocryStals were synthesized by simple aqueous precipitation at 60 ℃,the formation of pure Cu3(MoO4)2(OH)2 nanocrystals, which belongs to the monoclinic phase with calculated crystal parameters a = 0.53863 nm, b = 1.40006 nm, c = 0.56003 nm, β = 98.47°, a = y = 90°. The energy dispersive X-ray spectrum (EDX) analysis gives an approximate atomic ratio of 3: 2:10 for Cu: Mo: O. The scanning electron microscope(SEM) and transmission electron microscope (TEM) studies show that the as-prepared nanoparticles are well crystallized with tabular structure and the interplanar distances of d021 and d(21)measured are 0.435 nm and 0.358 nm,coinciding with the theoretical value. It can also be seen that the Cu3(MoO4)2(OH)2 has a good thermal stability and starts decomposing at 320 ℃ through thermogravimetric-differential thermal analysis (TG-DTA). Moreover, the strong fluorescent property of the Cu3(MoO4)2(OH)2 is measured, with green emission peak at ca. 530 nm upon excitation at ca. 369 nm. Finally, a possible mechanism for the formation of Cu3(MoO4)2(OH)2 nanocrystals is proposed.%以硝酸铜、钼酸钠及氢氧化钠为原料,采用简单的水相沉淀法,在60℃下合成出钼铜矿(Cu3(MoO4)2(OH)2).通过X射线衍射、扫描电镜、透射电镜、热重与差热分析、红外光谱及荧光光谱等测试手段对材料的微观结构、形貌、热稳定性及谱学特性进行表征分析.结果显示,制备的产物为结晶性良好的、至少一维是纳米的片状结构材料,属于单斜型(晶胞参数a=0.53863 nm,b=1.40006 nm,c=0.56003 nm),其元素摩尔含量比约为3:2:10,与推测的分子式完全吻合.热重与差热分析数据表明Cu3(MoO4)2(OH)2纳米晶具有很好的热稳定性且起始分解温度为320℃.通过软件测得的d(021)面与d(i21)面的晶间面距分别为0.435nm与0.358 nm,与理论值基本相符.经测量,Cu3(MoO4)2(OH)2纳米晶具有强的荧光性质,在激发波长369 nm的作用下在530 nm表现为强发射峰.此外,还探讨了Cu3(MoO4)2(OH)2纳米晶的形成机理.