纳米孔
材料科学
微观结构
激光器
纳米孔
多孔性
拉曼散射
合金
同质性(统计学)
复合材料
扫描电子显微镜
冶金
电化学
激光功率缩放
拉曼光谱
电极
化学工程
纳米技术
光学
化学
物理化学
工程类
物理
统计
数学
作者
Chang-sheng Dong,Yu Gu,Ming-Cheng Zhong,Lin Li,Ming-xing Ma,Wen Jin Liu
标识
DOI:10.1016/j.apsusc.2010.09.117
摘要
Nanoporous manganese was fabricated by a three-step process involving high power laser cladding of a homogeneous Cu40Mn60 alloy coatings onto a mild steel substrate, laser remelting for tuning the grain size and the composition homogeneity followed by selectively electrochemical de-alloying for removal of Cu element and formation of nanoporous Mn. The microstructure and homogeneity of the precursor Cu40Mn60 alloys have a significant influence on the evolution of nanopores during selectively electrochemical de-alloying. Laser remelting can significantly refine the microstructure. The second dendrite arm spacing decreases with increasing of laser remelting scanning speed. A SDAS of 1.17 μm was obtained at the laser scanning speed of 133 mm/s. When the remelting scanning speed reaches 100 mm/s, a nanoporous structure with average pore size less than 100 nm was achieved under optimized dealloying electrode current density about 2 mA/cm2. Nanoporous Mn with nanopore sizes ranging from 80 to 130 nm was fabricated by this method. Surface-enhanced Raman scattering characteristics of the nanoporous materials have been investigated. It is found that smaller nanoporosity leads to significant improvements in surface-enhanced Raman scattering.
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