Multiwalled carbon nanotubes for flow-induced voltage generation
Multiwalled carbon nanotubes for flow-induced voltage generation
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DOI：
10.1063/1.2710776
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发表时间：
2007-03-15
影响因子：
3.2
通讯作者：
Baur, Jeff W.
中科院分区：
文献类型：
--
作者：
Liu, Jianwei;Dai, Liming;Baur, Jeff W.
最近，据报道，可以通过使流体通过单壁碳纳米管（SWCNT）阵列来产生电压，其具有大动态范围的流量传感器的潜在应用。本工作研究多壁碳纳米管（MWCNTs）的电压产生特性作为相对于流动方向，流速和溶液离子强度的纳米管阵列的相对取向的函数。结果发现，通过使纳米管沿着流动方向排列，增加流动液体的流速和/或离子强度，可以显著增强流动诱导电压。一个类似于30 mV的流动诱导电压已产生从我们的平行排列的多壁碳纳米管在1 M NaCl水溶液中在相对较低的流速为0.0005米/秒，这是15倍以上的单壁碳纳米管报道的最高电压。的结果是一致的脉动不对称棘轮机制提出的单壁碳纳米管阵列，其中一个不对称的空间分布的应变形成从与在管表面的极性和离子物种的相互作用，并被驱动沿着管的流体流动。(c)2007年，美国物理学会。
Recently it has been reported that voltage can be generated by passing fluids over single-walled carbon nanotube (SWCNT) arrays with potential application to flow sensors with a large dynamic range. The present work investigates voltage generation properties of multiwalled carbon nanotubes (MWCNTs) as a function of the relative orientation of the nanotube array with respect to the flow direction, flow velocity, and solution ionic strength. It was found that the flow-induced voltage can be significantly enhanced by aligning the nanotubes along the flow direction, increasing the flow velocity and/or the ionic strength of the flowing liquid. A flow-induced voltage of similar to 30 mV has been generated from our perpendicularly-aligned MWCNT in an aqueous solution of 1M NaCl at a relatively low flow velocity of 0.0005 m/s, which is 15 times higher than the highest voltage reported for single-walled carbon nanotubes. The results are generally consistent with the pulsating asymmetric ratcheting mechanism proposed for SWCNT arrays, in which an asymmetrical spatial distributed strain forms from interactions with the polar and ionic species at the tube surface and is driven along the tube by the fluid flow. (c) 2007 American Institute of Physics.