通过使十二烷基硫酸钠-单壁碳纳米管悬浮液流经微流体通道实现光致发光和分散稳定性的长期改善。

Long-term improvements to photoluminescence and dispersion stability by flowing SDS-SWNT suspensions through microfluidic channels.

作者信息

Silvera-Batista Carlos A, Weinberg Philip, Butler Jason E, Ziegler Kirk J

机构信息

Department of Chemical Engineering, Center for Surface Science and Engineering, University of Florida, Gainesville, Florida 32611, USA.

出版信息

J Am Chem Soc. 2009 Sep 9;131(35):12721-8. doi: 10.1021/ja903705k.

DOI:10.1021/ja903705k

PMID:19678679

Abstract

Shearing single-walled carbon nanotubes (SWNTs) coated with sodium dodecyl sulfate in microfluidic channels significantly increases the photoluminescence (PL) intensity and dispersion stability of SWNTs. The PL quantum yield (QY) of SWNTs improves by a factor of 3 for initially bright suspensions; on the other hand, SWNT QYs in a "poor" suspension improve by 2 orders of magnitude. In both cases, the QYs of the sheared suspensions are approximately 1%. The increases in PL intensity persist for months and are most prominent in larger diameter SWNTs. These improvements are attributed to surfactant reorganization rather than disaggregation of SWNTs bundles or shear-induced alignment. The results also highlight potential opportunities to eliminate discrepancies in the PL intensity of different suspensions and further improve the PL of SWNTs by tailoring the surfactant structure around SWNTs.

摘要

在微流控通道中剪切涂有十二烷基硫酸钠的单壁碳纳米管（SWNTs），可显著提高SWNTs的光致发光（PL）强度和分散稳定性。对于初始明亮的悬浮液，SWNTs的PL量子产率（QY）提高了3倍；另一方面，“不良”悬浮液中的SWNT QYs提高了2个数量级。在这两种情况下，剪切后悬浮液的QYs约为1%。PL强度的增加可持续数月，并且在较大直径的SWNTs中最为显著。这些改善归因于表面活性剂的重新排列，而非SWNTs束的解聚或剪切诱导的排列。结果还突出了消除不同悬浮液PL强度差异以及通过调整SWNTs周围表面活性剂结构进一步提高SWNTs PL的潜在机会。