CAREER: Morphological Control and Applications of Nanoporous Gold

职业：纳米多孔金的形态控制及应用

• 批准号: 0092756
• 负责人: Jonah Erlebacher
• 金额: $ 48.78万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0092756&HistoricalAwards=false
• 关键词: CAREER; Morphological; Control; Applications; Nanoporous

0092756Erlebacher This grant looks at the formation mechanism, coarsening behavior, and applications of nanoporous gold (NPG). NPG is formed by dissolving silver from gold/silver alloys in acid, a dealloying process that leaves behind an open sponge of nearly pure gold. By varying the experimental conditions such as the pre-alloyed composition and post-dealloying annealing time, the size of the spongy ligaments is tunable over length scales from 5 nm to many microns. For this research NPG is a model system for studying nanoscale surface kinetics. NPG films will be grown by electron beam evaporation, and the time evolution of the porosity will be characterized by SEM and TEM. Coarsening behavior will be examined to measure surface diffusivity as a function of chemical environment. The research includes refinement of a general-purpose atomistic simulation program.%%%NPG holds great promise in applications where high surface open structures are advantageous, e.g. sensors and electrodes. A simple MEMS hydrogen fuel cell will be built with NPG coated with platinum catalyst as the electrodes.***

0092756Erlebacher 这项资助着眼于纳米多孔金 (NPG) 的形成机制、粗化行为和应用。 NPG 是通过将金/银合金中的银溶解在酸中而形成的，这是一种脱合金过程，留下了几乎纯金的开放海绵。 通过改变预合金成分和脱合金后退火时间等实验条件，海绵韧带的尺寸可在 5 nm 至多个微米的长度范围内调节。 对于这项研究，NPG 是一个用于研究纳米级表面动力学的模型系统。 NPG 薄膜将通过电子束蒸发生长，孔隙率的时间演变将通过 SEM 和 TEM 进行表征。 将检查粗化行为以测量作为化学环境函数的表面扩散率。 该研究包括改进通用原子模拟程序。%%%NPG 在高表面开放结构具有优势的应用中具有广阔的前景，例如传感器和电极。一个简单的 MEMS 氢燃料电池将采用涂有铂催化剂的 NPG 作为电极来构建。***