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A preparation and optical property study of Nanostructured-Metal Materials

纳米结构金属材料的制备及光学性能研究

基本信息

批准号：
17F17793
负责人：
渡辺健太郎
金额：
$ 1.41万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2017
资助国家：
日本
起止时间：
2017-11-10 至 2020-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17793/
关键词：
Vapor Phase Dealloying Nanoporous Metal nanoporous materials

项目摘要

Vapor phase dealloying (VPD) is expected as a universal, highly efficient and environmentally friendly method for fabricating 3D bicontinuous nanoporous metals, by using vapor pressure difference between constituent elements. However, the relation between dealloying conditions and above microstructural parameters are still unclear due to underlying dealloying kinetics, such as thermal evaporation of constituent element, resulting diffusion both in bulk alloys and in pore channels, and alloys phase evolution. In this work, 3D bicontinuous nanoporous Cu by vapor phase dealloying (VPD) of Cu12Zn88 alloy is chosen as the model system and its dealloying kinetics and alloy phase evolution are investigated. We found that Zn is selectively evaporated out from the precursor Cu12Zn88 alloy during the process of VPD due to the vapor pressure difference between Cu and Zn and an intermediate phase Cu36Zn64 is formed in the dealloying front before Zn evaporation. The power law relation between the pore depth and dealloying time reveals the bulk diffusion controlled dealloying process for intermediate phase. The porous structure starts to appear in the intermediate region and the appearance time closely relies on dealloying temperature. The constant dealloying front velocity is mainly dominated by dealloying temperature and slightly increased in high vacuum condition, indicating that the dealloying kinetics is dominated by interfacial effect rather than mass transport effect in pore channel.

气相去合金化（VPD）是一种通用、高效、环境友好的制备三维双连续纳米多孔金属的方法，它利用了组成元素之间的蒸气压差。然而，由于潜在的脱合金动力学，如成分的热蒸发，导致在块体合金和孔通道中的扩散，以及合金相演变，脱合金条件和上述微观结构参数之间的关系仍然不清楚。本文以Cu12Zn88合金的气相脱合金（VPD）三维双连续纳米孔Cu为模型体系，研究了其脱合金动力学和合金相演化。研究发现，在真空等离子体沉积过程中，由于Cu和Zn之间的蒸气压差，Zn从Cu 12 Zn 88合金中选择性地蒸发出来，在Zn蒸发前的脱合金前沿形成中间相Cu 36 Zn 64。孔隙深度与脱合金时间的幂律关系揭示了中间相的脱合金过程为体扩散控制。脱合金温度对多孔结构的形成时间有很大影响。恒定的脱合金前沿速度主要受脱合金温度控制，在高真空条件下略有增加，表明脱合金动力学主要受界面效应而非孔道内的传质效应控制。