金属种子绿色生长贵金属Ag纳米线

Seed of Green Growth of Metals Precious Metals Agnanowires

采用水热合成法,以硝酸银(AgNO_(3))为银源,十六烷基三甲基溴化铵(CTAB)为表面活性剂,抗坏血酸(L-AA)作为还原生长剂。以去离子水为基底溶液,将银源置入生长液中,通过调控表面活性剂与还原生长剂的浓度比例,基于配体位阻效应和种子生长法,成功制备出以Ag+为中心原子,自然生长出一维贵金属Ag纳米线。通过扫描电子显微镜观测其宏观形貌结构、组织特征,并改变反应参数等物理变量尝试改变其生长方向。从电子显微镜结果显示,在室温条件下生长24h,其纳米线直径在150nm左右,这将增大催化表面活性面积,并有助于电子的传输,同时Ag纳米线相互交错穿插,形成立体三维的网格结构,也在微观内应力方面提供了材料弹性延展的可能。

Silver nitrate(AgNO_(3))was used as silver source,cetyltrimethylammonium bromide(CTAB)as surfactant and ascorbic acid(L-AA)as reducing growth agent.When the silver source is placed in the growth solution with deionized water as the base solution,the proportional concentration of surfactant and reducing growth agent is regulated.On the basis of ligand resistance and seed growth,one-dimensional noble metal nanowires were successfully prepared with Ag as Ag center atom.The macroscopic morphology,structure and microstructure were observed by scanning electron microscope,and physical variables such as reaction parameters were changed.The results of electron microscopy show that the diameter of nanowires growing 24 h at room temperature is about 150 nm,which will increase the active area of catalytic surface and contribute to the transmission of electrons.At the same time,Ag nanowires interlaced to form a three-dimensional mesh structure,which also provides the possibility of elastic extension of materials in terms of microscopic internal stress.