Stabilization and “ Debundling ” of Single-Wall Carbon Nanotube Dispersions in N-Methyl-2-pyrrolidone ( NMP ) by Polyvinylpyrrolidone ( PVP )

Content Provider	Semantic Scholar
Author	Hasan, Tawfique Scardaci, Vittorio Tan, Pingheng
Abstract	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.
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Alternate Webpage(s)	http://www-g.eng.cam.ac.uk/nms/publications/pdf/Hasan_JPCC2007.pdf
Language	English
Access Restriction	Open
Subject Keyword	Carbon Tetrachloride Nanotubes Nanotubes, Carbon Photoluminescence Povidone Protected Media Path Single-Walled Nanotube Tomography, Emission-Computed, Single-Photon Ultrasonics (sound) fiberglass filtration
Content Type	Text
Resource Type	Article