标题：REFINEMENT OF LIGAMENTS OF NANOPOROUS Ag RIBBONS BY CONTROLLING THE SURFACE DIFFUSION OF Ag
作者：Song, Tingting; Gao, Yulai; Zhang, Zhonghua; Zhai, Qijie
作者机构：[Song, Tingting; Gao, Yulai] Shanghai Univ, Lab Microstruct, 99 Shangda Rd, Shanghai 200436, Peoples R China.; [Song, Tingting; Gao, Yulai] Shanghai 更多
会议名称：Symposium on Materials Processing and Interfaces from 141st TMS Annual Meeting and Exhibition
会议日期：MAR 11-15, 2012
来源：TMS 2012 141ST ANNUAL MEETING & EXHIBITION - SUPPLEMENTAL PROCEEDINGS, VOL 1: MATERIALS PROCESSING AND INTERFACES
关键词：Nanoporous silver; Chemical dealloying; Finer ligament; Surfactant
摘要：Nanoporous silver (NPS) with different nanoporosity was manufactured by chemical dealloying of rapid solidified Al-Ag ribbons consisting of two distinct phases of alpha-Al(Ag) and Ag2Al. The as-dealloyed samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. It is found that the width of the average ligaments can be dramatically decreased and more homogeneous when surfactants were added to the H2SO4 solution, which would definitely increase the specific area of NPS and this is pretty desirable for certain applications, such as catalyst, absorption, etc. The finer ligaments were attributing to the hindered surface diffusion of Ag atoms by surfactants, and the surface diffusion coefficient (D-s) of Ag was decreased from the order of 10(-14) to 10(-16) m(2)/s as a result of surfactants. This simple method to reduce the ligament width of NPS is also anticipated to prepare other related nanoporous metals.