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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Kinetics of Photoactuation in Single Wall Carbon Nanotube-Nafion Bilayer Composite
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Kinetics of Photoactuation in Single Wall Carbon Nanotube-Nafion Bilayer Composite

机译：单壁碳纳米管-Nafion双层复合材料的光致化动力学。

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摘要

Cantilevers made of a bilayer composite of single walled carbon nanotubes (SWNTs) deposited onto Nafion exhibit substantial mechanical motion upon exposure to visible or near-infrared light. The kinetics of the tip displacement are studied as a function of SWNT thickness, mass loading, and humidity level. The rate constants strongly depend upon the SWNT layer thickness. During the light-on cycle the absorption of the light by the SWNTs drives the motion while in the light-off cycle the stiffness of the SWNTs retards the relaxation. At low humidity levels a second, fast, but small, response in the opposite direction of the net major displacement is observed. The kinetics of the photoactuation was also monitored by IR spectroscopy with similar kinetic parameters. The primary mechanism responsible for the actuation appears to be migration of water and hydrated hydrogen ions in the Nafion film toward the interface and into the SWNT layer.
机译：由沉积在Nafion上的单壁碳纳米管（SWNT）双层复合材料制成的悬臂在暴露于可见光或近红外光时会表现出明显的机械运动。研究了尖端位移的动力学，它是SWNT厚度，质量载荷和湿度水平的函数。速率常数在很大程度上取决于SWNT层的厚度。在点亮周期中，SWNT吸收光会驱动运动，而在熄灭周期中，SWNT的刚度会延迟松弛。在低湿度水平下，在净主位移的相反方向上会观察到第二个快速但很小的响应。还通过具有相似动力学参数的IR光谱法监测光致动的动力学。促动的主要机理似乎是水和Nafion膜中的水合氢离子向界面迁移并进入SWNT层。

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