Stabilization and "Debundling" of single-wall carbon nanotube dispersions in N-Methyl-2-pyrrolidone (NMP) by polyvinylpyrrolidone (PVP)
Stabilization and "Debundling" of single-wall carbon nanotube dispersions in N-Methyl-2-pyrrolidone (NMP) by polyvinylpyrrolidone (PVP)
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DOI：
10.1021/jp0723012
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发表时间：
2007-08-30
影响因子：
3.7
通讯作者：
Ferrari, Andrea C.
中科院分区：
文献类型：
--
作者：
Hasan, Tawfique;Scardaci, Vittorio;Ferrari, Andrea C.
提出了一种简单的方法，用聚乙烯吡咯烷酮（PVP）稳定单壁碳纳米管（SWNT）在N-甲基-2-吡咯烷酮（NMP）中的分散体。通过超声处理，然后通过玻璃纤维过滤器真空过滤，获得大量分离的SWNT以及NMP中的小束SWNT。在3周的时间内通过光致发光（PL）光谱监测所得的在纯NMP中的分散体。这种分散体的PL强度随时间而降低，表明纳米管的缓慢微观聚集。然而，PVP的加入显著提高了稳定性。此外，PVP还自发地“解开”一些纳米管聚集体，增加了孤立的单壁碳纳米管的人口没有进一步的超声波处理。
We present a simple method to stabilize single-wall carbon nanotube (SWNT) dispersions in N-methyl-2pyrrolidone (NMP) by polyvinylpyrrolidone (PVP). A significant population of isolated SWNTs as well as small bundles of SWNTs in NMP is obtained by ultrasonic treatment followed by vacuum filtration through glass fiber filters. The resulting dispersions in pure NMP are monitored by photoluminescence (PL) spectroscopy over a period of 3 weeks. The PL intensities of such dispersions decrease with time, suggesting slow microscopic aggregation of nanotubes. However, addition of PVP dramatically improves the stability. In addition, PVP also spontaneously "debundles" some nanotube aggregates, increasing the isolated SWNT population without further ultrasonic treatment.