Surface-chemistry-driven actuation in nanoporous gold
Surface-chemistry-driven actuation in nanoporous gold
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DOI：
10.1038/nmat2335
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发表时间：
2009-01-01
期刊：
影响因子：
41.2
通讯作者：
Hamza, A. V.
中科院分区：
文献类型：
--
作者：
Biener, J.;Wittstock, A.;Hamza, A. V.
虽然生物系统中的致动完全由化学能驱动，但这一概念尚未在人造致动器技术中实现，因为这些技术首先依赖于发热或发电(1)。在这里，我们证明了表面化学驱动的驱动可以在高表面积材料中实现，如纳米多孔金。例如，通过将纳米孔Au交替暴露于臭氧和一氧化碳中，我们获得了百分之零点几的可逆应变幅度。这种效应可以用吸附物引起的表面应力变化来解释(2)，并且可以用来将化学能直接转化为机械响应，从而为表面化学驱动的执行器和传感器技术打开了大门。
Although actuation in biological systems is exclusively powered by chemical energy, this concept has not been realized in man-made actuator technologies, as these rely on generating heat or electricity first(1). Here, we demonstrate that surface-chemistry-driven actuation can be realized in high-surface-area materials such as nanoporous gold. For example, we achieve reversible strain amplitudes of the order of a few tenths of a per cent by alternating exposure of nanoporous Au to ozone and carbon monoxide. The effect can be explained by adsorbate-induced changes of the surface stress(2), and can be used to convert chemical energy directly into a mechanical response, thus opening the door to surface-chemistry-driven actuator and sensor technologies.