Controlled Orientation and Alignment in Films of Single-Walled Carbon Nanotubes Using Inkjet Printing
Controlled Orientation and Alignment in Films of Single-Walled Carbon Nanotubes Using Inkjet Printing
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DOI：
10.1021/la300770b
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发表时间：
2012-06-12
期刊：
影响因子：
3.9
通讯作者：
Walus, Konrad
中科院分区：
文献类型：
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作者：
Beyer, Simon T.;Walus, Konrad
提出了一种用于沉积碳纳米管（CNT）膜的喷墨印刷方法，所述碳纳米管膜表现出非常高的长程相互对准程度以及相对于印刷几何形状的受控取向。CNT自组装是由CNT悬浮液的固有溶致液晶性诱导的。通过将喷墨沉积速率与印刷特征的数值模拟的局部蒸发速率匹配来达到足够的浓度，并且使得CNT悬浮液能够使用标准喷墨印刷来印刷。使用扫描电子显微镜（SEM）和偏振光显微镜验证表面对准。此外，本体形态进行了研究，发现是由堆叠的平面层，不一定具有相同的长程取向上发现的表面上。本体形态的特征在于通过弹性体剥离过程去除层，并通过使用SEM观察膜的横截面。CNT浓度和长度跨越实验，发现非常短和非常长的CNT以及低浓度悬浮液不产生长距离对准。
An inkjet printing procedure for depositing films of carbon nanotubes (CNTs) that exhibit a very high degree of long-range mutual alignment as well as a controlled orientation with respect to the printed geometry is presented. CNT self-assembly was induced by the intrinsic lyotropic liquid crystallinity of CNT suspensions. Sufficient concentrations are reached by matching the inkjet deposition rate to the numerically modeled local evaporation rate of the printed feature and enable the CNT suspension to be printed using standard inkjet printing. Surface alignment was verified using scanning electron microscopy (SEM) and polarized light microscopy. In addition, the bulk morphology was investigated and found to be composed of stacked planar layers that did not necessarily have the same long-range orientation found on the surface. The bulk morphology was characterized by removing layers through an elastomeric peeling process and by observing cross sections of the films using SEM. CNT concentration and length were spanned experimentally, and it was found that very short and very long CNTs as well as low concentration suspensions did not yield long-range alignment.