Xiao Ni, Chen Yinan, Weng Wei, Chi Xiaopeng, Chen Hang, Tang Ding, Zhong Shuiping
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China.
Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China.
Nanomaterials (Basel). 2022 Aug 4;12(15):2681. doi: 10.3390/nano12152681.
The controllable preparation of silver nanowires (AgNWs) with a high aspect ratio is key for enabling their applications on a large scale. Herein, the aspect ratio regulation of AgNWs mediated by halogen ion composition in ethylene glycol system was systematically investigated and the size evolution mechanism is elaborately understood. The co-addition of Br and Cl results in AgNWs with the highest aspect ratio of 1031. The surface physicochemical analysis of AgNWs and the density functional theory calculations indicate that the co-addition of Br and Cl contributes to the much-enhanced preferential growth of the Ag(111) crystal plane. At the same time, when Cl and Br coexist in the solution, the growth of the Ag(100) crystal plane on the AgNWs was restrained compared with that in the single Cl system. Resultantly, the enhanced growth of Ag(111) and the inhibited growth of Ag(100) contribute to the formation of AgNWs with a higher aspect ratio in the Cl-Br mixed solution. The results can provide new insights for understanding the morphology and size evolution during the AgNWs preparation in ethylene glycol system.
可控制备高长径比的银纳米线（AgNWs）是实现其大规模应用的关键。在此，系统研究了乙二醇体系中卤素离子组成介导的AgNWs长径比调控，并深入理解了其尺寸演变机制。Br和Cl的共添加导致AgNWs的长径比最高可达1031。对AgNWs的表面物理化学分析和密度泛函理论计算表明，Br和Cl的共添加有助于显著增强Ag(111)晶面的择优生长。同时，当溶液中Cl和Br共存时，与单一Cl体系相比，AgNWs上Ag(100)晶面的生长受到抑制。结果，Ag(111)的增强生长和Ag(100)的抑制生长有助于在Cl-Br混合溶液中形成具有更高长径比的AgNWs。这些结果可为理解乙二醇体系中AgNWs制备过程中的形貌和尺寸演变提供新的见解。
