Stabilization and "Debundling" of Single-Wall Carbon Nanotube Dispersions in N-Methyl-2-pyrrolidone (NMP) by Polyvinylpyrrolidone (PVP)
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- 作者：Tawfique Hasan ; Vittorio Scardaci ; PingHeng Tan ; Aleksey G. Rozhin ; William I. Milne ; Andrea C. Ferrari
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：August 30, 2007
- 年：2007
- 卷：111
- 期：34
- 页码：12594 - 12602
- 全文大小：279K
- 年卷期：v.111,no.34(August 30, 2007)
- ISSN：1932-7455
文摘
We present a simple method to stabilize single-wall carbon nanotube (SWNT) dispersions in N-methyl-2-pyrrolidone (NMP) by polyvinylpyrrolidone (PVP). A significant population of isolated SWNTs as well assmall bundles of SWNTs in NMP is obtained by ultrasonic treatment followed by vacuum filtration throughglass fiber filters. The resulting dispersions in pure NMP are monitored by photoluminescence (PL) spectroscopyover a period of 3 weeks. The PL intensities of such dispersions decrease with time, suggesting slow microscopicaggregation of nanotubes. However, addition of PVP dramatically improves the stability. In addition, PVPalso spontaneously "debundles" some nanotube aggregates, increasing the isolated SWNT population withoutfurther ultrasonic treatment.