4.5 Article

Nanoporous-Gold-Polypyrrole Hybrid Materials for Millimeter-Sized Free Standing Actuators

期刊

ADVANCED MATERIALS INTERFACES
卷 7, 期 24, 页码 -

出版社

WILEY
DOI: 10.1002/admi.202001415

关键词

actuation; nanoporous gold; polypyrrole; strain‐ charge coupling

资金

  1. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [192346071-SFB 986]
  2. Projekt DEAL

向作者/读者索取更多资源

This work studies the actuation of hybrid materials made from nanoporous gold, polypyrrole, and aqueous electrolyte. The deposition protocol affords a conformal polypyrrole coating on the entire internal interface of millimeter-sized nanoporous metal specimens made by dealloying. The hybrid material emerges when the remaining pore space is filled with perchloric acid. The metal serves as load-bearing and electronically conductive substrate, the polypyrrole as functional active component for actuation, and the aqueous electrolyte provides a pathway for fast ionic conduction. In this way, an actuator material is obtained that can be manufactured as monolithic bodies that can be subjected to compressive loads. Actuators with dimensions of millimeters in each spatial direction achieve characteristic times for actuation in the order of seconds and their work density is comparable to that of state-of-the-art piezoceramics. As a remarkable finding, the actuation strain scales with the square of the polypyrrole phase fraction. This is surprising in view of the linear scaling predicted by conventional micromechanical models. A micromechanical model that explains this behavior as the result of polypyrrole bridges that link adjacent struts of the metal skeleton is presented.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据