NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Photoconductive lifetimes of carbon nanotubes films

Published

Author(s)

Katie Hurst, Richard K. Ahrenkiel, Steve W. Johnston, Anne Dillon, Lara Roberson, John H. Lehman

Abstract

The photoconductive recombination lifetimes of carbon nanotube (CNT) thin films as a function of wavelength are measured by resonant-coupled photoconductive decay (RCPCD) method (1). The carrier recombination lifetime is a fundamental property of carbon nanotubes which is typically determined by contact-based techniques or spectroscopic methods. The RCPCD measurement is based on a pump-probe technique in which an optical pump and a low frequency microwave probe are employed and is well suited to characterization of bulk and extrinsic material properties. Our results demonstrate the role of purification and the effect of the interaction of nanotubes and polymers in thin films of multi-walled carbon nanotube and single-walled carbon nanotubes. Possible mechanisms describing the interaction of photoexcited carriers in the nanotube polymer composites will be discussed. Finally, we report the wavelength dependence of photoconductive lifetimes. Raman spectroscopy and UV-VIS absorption measurements provide further identification and characterization of nanotube samples to enable correlation of nanotube properties with the efficiency of charge transport. (1) R.K. Ahrenkiel, S.W. Johnston Mater. Sci. Eng. B 102 (2003) 161
Citation
Materials Research Society (MRS)
Pub Type
Others

Keywords

carbon nanotubes, photoconductivity
Optoelectronics

Citation

Hurst, K. , Ahrenkiel, R. , Johnston, S. , Dillon, A. , Roberson, L. and Lehman, J. (2007), Photoconductive lifetimes of carbon nanotubes films, Materials Research Society (MRS) (Accessed October 25, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created November 29, 2007, Updated January 27, 2020
Was this page helpful?