Nano Archive

Kinetics of PL quenching during single-walled carbon nanotube rebundling and diameter-dependent surfactant interactions

McDonald, Timothy J. and Engtrakul, Chaiwat and Jones, Marcus and Rumbles, Garry and Heben, Michael J. (2006) Kinetics of PL quenching during single-walled carbon nanotube rebundling and diameter-dependent surfactant interactions. JOURNAL OF PHYSICAL CHEMISTRY B, 110 (50). pp. 25339-25346.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://dx.doi.org/10.1021/jp065281x

Abstract

The kinetics of single-walled carbon nanotube rebundling have been investigated by photoluminescence (PL) spectroscopy. The rate of loss of PL intensity was measured for 12 different nanotubes in three common aqueous surfactants (sodium dodecyl sulfate, SDS; sodium dodecylbenzene sulfonate, SDBS; and sodium cholate, SC) as the surfactant suspensions were diluted to promote nanotube rebundling, quenching of semiconductor nanotube PL, and precipitation. The rate of PL decay was first-order in the concentration of isolated nanotubes, as expected if surfactant desorption is rate-limiting in the rebundling process. Temperaturedependent measurements permitted an Arrhenius analysis from which diameter-dependent activation energies were determined. SDS was found to have very strong diameter dependence for activation energy, with stronger binding to smaller-diameter nanotubes, whereas SDBS displayed a weaker diameter dependence. SC was found to bind strongly to certain nanotubes and weakly to the (10,2) nanotube. The PL emission red shifted with time after dilution as surfactant desorption proceeded. This effect is attributed to an increase in the micropolarity at the nanotube surface.

Item Type:Article
Subjects:Physical Science > Nanophysics
Technology > Nanotechnology and environmental applications
Physical Science > Nano objects
Physical Science > Photonics
ID Code:3076
Deposited By:Anuj Seth
Deposited On:13 Jan 2009 12:53
Last Modified:22 Jan 2009 15:30

Repository Staff Only: item control page